Downforce testing system and method

Abstract

The application relates to the technical field of batteries, and discloses a pressing-down test system and method, which comprises a pressing-down module, a reference piece, a calculation module and a sensor; the pressing-down module is used for applying pressure to the reference piece, the reference piece is used for simulating the pressure state of a wound bare battery cell in a pressing-down process; the sensor is used for acquiring sensing data of the reference piece in the pressure process and sending the sensing data to the calculation module; and the calculation module is used for obtaining pressing-down information of the pressing-down module according to the sensing data. The application simulates the pressure state of a wound bare battery cell in a pressing-down process by arranging the reference piece, acquires sensing data of the reference piece in the pressure process by the sensor, detects the pressing-down information according to the sensing data, can simplify the pressing-down test operation, and can improve the pressing-down test efficiency and accuracy.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically to a pressure testing system and method. Background Technology

[0002] In lithium battery manufacturing, the winding process involves stacking the positive electrode sheet, negative electrode sheet, and separator (insulating layer) in the order of "positive electrode-separator-negative electrode-separator" and then winding them into a "bare cell" using a winding machine. During the winding process, the inner ring gap (GAP) problem can easily form due to the pressure process of the bare cell. The winding GAP is the gap or distance between two adjacent layers of winding material in a winding process (such as battery cell winding, thin film / metal strip winding, etc.). It is a key parameter affecting winding quality: too small a GAP may lead to material compression deformation and wrinkles; too large a GAP may cause loose winding and interlayer misalignment, affecting the structural stability of the product (such as the energy density and mechanical strength of the battery cell).

[0003] Therefore, to address the gap-aperture (GAP) issue within bare battery cells, a voltage test is typically required. However, the current voltage test method involves manual point inspection, which is complex, inefficient, and prone to errors. Summary of the Invention

[0004] In view of the above problems, the present invention provides a pressure testing system and method, which aims to solve the problems that the relevant pressure testing methods rely on manual point detection, which are complicated to operate, have low detection efficiency, and are prone to errors.

[0005] In a first aspect, the present invention provides a pressure testing system, the pressure testing system comprising: a pressure module, a reference component, a calculation module, and a sensor;

[0006] The pressing module is used to apply pressure to the reference component, which is used to simulate the pressure state of the wound bare cell during the pressing process.

[0007] The sensor is used to acquire sensing data of the reference component during the pressure process and send the sensing data to the computing module;

[0008] The calculation module is used to obtain the pressure information of the pressure-down module based on the sensing data;

[0009] The sensing data includes pressure data, and the pressure information includes pressure uniformity and / or pressure tilt.

[0010] And / or, the sensing data includes displacement data, and the pressure information includes pressure depth information.

[0011] In the technical solution of this invention, a reference component is set to simulate the pressure state of the wound bare cell during the pressure-down process, and a sensor is used to obtain the sensing data of the reference component during the pressure-down process. The pressure-down information of the pressure-down module is detected based on the sensing data, thereby simplifying the pressure-down test operation and improving the efficiency and accuracy of the pressure-down test.

[0012] In some embodiments, the sensor includes a pressure array disposed on the surface of the reference member, the sensing data includes pressure data, and the pressure information includes pressure uniformity and / or pressure tilt; wherein...

[0013] The pressure array is used to acquire pressure data of the reference component during the pressure process and send the pressure data to the calculation module;

[0014] The calculation module is also used to calculate the pressure uniformity and / or pressure tilt of the pressing module based on the pressure data.

[0015] In the technical solution of this invention embodiment, the sensor includes a pressure array, which is disposed on the surface of a reference component. The pressure array acquires pressure data of the reference component during the pressing process and sends the pressure data to a calculation module. The calculation module calculates the pressure uniformity and / or pressing tilt of the pressing module based on the pressure data, thereby accurately detecting the pressure uniformity and pressing tilt during the pressing process.

[0016] In some embodiments, the calculation module is further configured to generate pressure distribution information on the reference component based on the pressure data, and calculate the pressure uniformity of the pressing module based on the pressure distribution information.

[0017] In the technical solution of this invention embodiment, pressure distribution information on the reference component is first generated based on pressure data, and then the pressure uniformity of the pressing module is calculated based on the pressure distribution information, thereby improving the accuracy of pressure uniformity detection.

[0018] In some embodiments, the calculation module is further configured to calculate pressure dispersion evaluation parameters at various locations on the reference component based on the pressure distribution information, and to calculate the pressure uniformity of the pressing module based on the pressure dispersion evaluation parameters.

[0019] In the technical solution of this invention embodiment, the pressure dispersion evaluation parameters at each position on the reference component are first calculated based on the pressure distribution information, and the pressure uniformity of the pressing module is calculated based on the pressure dispersion evaluation parameters, thereby enabling the quantification of pressure uniformity and improving the accuracy of pressure uniformity.

[0020] In some embodiments, the pressure dispersion evaluation parameters include pressure standard deviation and pressure range.

[0021] In the technical solution of this invention, the dispersion evaluation parameters include pressure standard deviation and pressure range. The pressure uniformity of the pressure module is calculated by combining the pressure standard deviation and pressure range, thereby further improving the accuracy of pressure uniformity detection.

[0022] In some embodiments, the pressure distribution information includes a force distribution diagram of the reference component. The calculation module is further configured to determine the position coordinates of each position on the reference component, obtain the pressure value corresponding to the position coordinates based on the pressure data, and generate a force distribution diagram based on the position coordinates and the pressure value.

[0023] In the technical solution of this invention embodiment, the pressure distribution information includes the force distribution diagram of the reference component. First, the position coordinates of each position on the reference component are determined, and the pressure value corresponding to the position coordinate is obtained according to the pressure data. Then, the force distribution diagram is generated according to the position coordinate and the pressure value, thereby providing a visual reference for judging the pressure uniformity.

[0024] In some embodiments, the calculation module is further configured to input the pressure data into a preset tilt model and calculate the downward tilt of the downward module based on the preset tilt model.

[0025] In the technical solution of this invention embodiment, pressure data is input into a preset tilt model, and the downward tilt of the pressing module is calculated based on the preset tilt model, thereby improving the accuracy of downward tilt detection.

[0026] In some embodiments, the preset tilt model is a plane equation representing the pressure distribution on the reference component. The calculation module is further configured to determine the position coordinates of each position on the reference component, obtain the pressure value corresponding to the position coordinates based on the pressure data, input the position coordinates and the pressure value into the plane equation, solve the slope parameter in the plane equation, and calculate the downward tilt of the pressing module based on the slope parameter.

[0027] In the technical solution of this invention embodiment, the position coordinates of each position on the reference component are first determined, and the pressure value corresponding to the position coordinate is obtained according to the pressure data. The position coordinates and pressure value are then input into the plane equation to solve the slope parameter in the plane equation. Based on the slope parameter, the downward tilt of the pressing module is calculated, thereby further improving the accuracy of the downward tilt detection.

[0028] In some embodiments, the pressure testing system further includes: a control module;

[0029] The calculation module is also used to calculate a tilt adjustment value based on the downward tilt angle, and send the tilt adjustment value to the control module;

[0030] The control module is also used to adjust the tilt angle of the pressing module according to the tilt adjustment value.

[0031] In the technical solution of this invention embodiment, the tilt adjustment value is calculated based on the downward tilt angle, and the tilt angle of the downward module is adjusted based on the tilt adjustment value, thereby ensuring that the bare cell is subjected to uniform pressure and avoiding problems of excessive or insufficient local pressure caused by tilt.

[0032] In some embodiments, the pressure testing system further includes: an alarm module;

[0033] The calculation module is also used to determine the tilt alarm level corresponding to the downward tilt angle, and send the tilt alarm level to the alarm module, wherein the larger the downward tilt angle, the higher the tilt alarm level;

[0034] The alarm module is also used to generate tilt alarm information based on the tilt alarm level, and to issue an alarm based on the tilt alarm information.

[0035] In the technical solution of this invention embodiment, the tilt alarm level corresponding to the downward tilt is determined, and tilt alarm information is generated according to the tilt alarm level, thereby ensuring that operators can quickly grasp the details of the risk.

[0036] In some embodiments, the sensor includes a displacement gauge disposed on a support column of the reference member, the sensing data includes displacement data, and the compression information includes compression depth information; wherein...

[0037] The displacement gauge is used to acquire displacement data of the reference component during the compression process and send the displacement data to the calculation module;

[0038] The calculation module is used to calculate the compression depth information of the compression module based on the displacement data.

[0039] In the technical solution of this invention embodiment, the sensing data includes displacement data, the sensor includes a displacement gauge, the displacement gauge is disposed on the support column of the reference component, the displacement gauge generates displacement data of the reference component during the compression process, and the compression depth information of the compression module is calculated based on the displacement data, thereby enabling accurate detection of the compression depth information during the compression process.

[0040] In some embodiments, the compression depth information includes: average compression depth and compression depth deviation value;

[0041] The calculation module is also used to calculate the average pressing depth of the pressing module based on the displacement data;

[0042] The calculation module is also used to calculate the pressure depth deviation value of the pressure module based on the average pressure depth.

[0043] In the technical solution of this invention, the compression depth information includes the average compression depth and the compression depth deviation value. The average compression depth and the compression depth deviation value are calculated based on the displacement data, thereby further improving the accuracy of the compression depth information.

[0044] In some embodiments, the pressure testing system further includes: a control module;

[0045] The calculation module is used to obtain the initial height of the reference component and the specified height of the wound bare cell, and to calculate the height deviation value based on the initial height, the specified height and the average pressing depth.

[0046] The calculation module is used to determine the pressing depth adjustment value based on the height deviation value, and send the pressing depth adjustment value to the control module;

[0047] The control module is used to adjust the pressing depth of the pressing module according to the pressing depth adjustment value.

[0048] In the technical solution of this invention embodiment, the height deviation value is calculated based on the initial height of the reference component, the specification height of the wound bare cell, and the average value of the pressing depth. The pressing depth adjustment value is determined based on the height deviation value to adjust the pressing depth, thereby avoiding pressing too deep or too shallow and reducing the risk of winding GAP.

[0049] In some embodiments, the pressure testing system further includes: an alarm module;

[0050] The calculation module is also used to determine the pressure depth alarm level corresponding to the height deviation value, and send the pressure depth alarm level to the alarm module, wherein the larger the height deviation value, the higher the pressure depth alarm level;

[0051] The alarm module is used to generate pressure depth alarm information according to the pressure depth alarm level, and to issue an alarm based on the pressure depth alarm information.

[0052] In the technical solution of this invention embodiment, the pressure depth alarm level corresponding to the height deviation value is determined, and the tilt is generated according to the tilt alarm level, thereby ensuring that the operator can quickly grasp the risk details.

[0053] In some embodiments, the pressing module includes a first pressure plate and / or a second pressure plate. The first pressure plate is used to press down a preset middle region of the reference piece, and the second pressure plate is used to press down a preset overall region of the reference piece after the reference piece has been pressed down by the first pressure plate and the feeding clamp needle has been pulled out.

[0054] In the technical solution of this invention embodiment, the pressing module includes a first pressing plate and / or a second pressing plate. The first pressing plate is used to press down a preset middle area of ​​the reference piece. The second pressing plate is used to press down a preset overall area of ​​the reference piece after the reference piece has been pressed down by the first pressing plate and the feeding clamp needle has been pulled out, thereby enabling full-dimensional detection of the wound GAP.

[0055] In some embodiments, the pressure testing system further includes: a pin clamping control module and a carrier platform; wherein,

[0056] The clamping needle control module is used to place the feeding clamping needle into the reference part and control the feeding clamping needle to open.

[0057] The carrier platform is used to drive the reference component to move relative to the pressing module;

[0058] The needle clamping control module is also used to extract the feeding needle from the reference component after the first pressure plate has been pressed down.

[0059] In the technical solution of this invention embodiment, the pressure test is performed from the overall process perspective, thereby improving the comprehensiveness and reliability of the pressure test results.

[0060] Secondly, the present invention provides a method for pressure testing, comprising:

[0061] A pressure reference component, wherein the reference component is used to simulate the pressure state of a wound bare cell during the pressure-down process;

[0062] The sensor acquires the sensing data of the reference component during the pressure process, and obtains the pressure information of pressing down on the reference component based on the sensing data;

[0063] The sensing data includes pressure data, and the pressure information includes pressure uniformity and / or pressure tilt.

[0064] And / or, the sensing data includes displacement data, and the pressure information includes pressure depth information.

[0065] In the technical solution of this invention, a reference component is set to simulate the pressure state of the wound bare cell during the pressure-down process, and a sensor is used to obtain the sensing data of the reference component during the pressure-down process. The pressure-down information is detected based on the sensing data, thereby simplifying the pressure-down test operation and improving the efficiency and accuracy of the pressure-down test.

[0066] In some embodiments, the sensor includes a pressure array disposed on the surface of the reference member, the sensing data includes pressure data, and the compression information includes pressure uniformity and / or compression tilt. The step of acquiring sensing data of the reference member during the compression process through the sensor, and obtaining compression information of the reference member based on the sensing data, includes:

[0067] The pressure data of the reference component during the pressure process is obtained through the pressure array;

[0068] Calculate the pressure uniformity and / or pressure tilt of the reference component based on the pressure data.

[0069] In the technical solution of this invention embodiment, the sensor includes a pressure array, which is disposed on the surface of a reference component. The pressure array acquires pressure data of the reference component during the pressing process and sends the pressure data to a calculation module. The calculation module calculates the pressure uniformity and / or pressing tilt of the pressing module based on the pressure data, thereby accurately detecting the pressure uniformity and pressing tilt during the pressing process.

[0070] In some embodiments, calculating the pressure uniformity of pressing down on the reference member based on the pressure data includes:

[0071] Based on the pressure data, pressure distribution information on the reference component is generated;

[0072] The pressure uniformity of pressing down on the reference component is calculated based on the pressure distribution information.

[0073] In the technical solution of this invention embodiment, pressure distribution information on the reference component is first generated based on pressure data, and then the pressure uniformity of the pressing module is calculated based on the pressure distribution information, thereby improving the accuracy of pressure uniformity detection.

[0074] In some embodiments, calculating the pressure uniformity of pressing down on the reference member based on the pressure distribution information includes:

[0075] Calculate the pressure dispersion evaluation parameters at each location on the reference component based on the pressure distribution information;

[0076] The pressure uniformity of the reference component under pressure is calculated based on the pressure dispersion evaluation parameters.

[0077] In the technical solution of this invention embodiment, the pressure dispersion evaluation parameters at each position on the reference component are first calculated based on the pressure distribution information, and the pressure uniformity of the pressing module is calculated based on the pressure dispersion evaluation parameters, thereby enabling the quantification of pressure uniformity and improving the accuracy of pressure uniformity.

[0078] In some embodiments, the pressure dispersion evaluation parameters include pressure standard deviation and pressure range.

[0079] In the technical solution of this invention, the dispersion evaluation parameters include pressure standard deviation and pressure range. The pressure uniformity of the pressure module is calculated by combining the pressure standard deviation and pressure range, thereby further improving the accuracy of pressure uniformity detection.

[0080] In some embodiments, the pressure distribution information includes a force distribution diagram of the reference component, and generating pressure distribution information on the reference component based on the pressure data includes:

[0081] Determine the position coordinates of each position on the reference component, and obtain the pressure value corresponding to the position coordinates based on the pressure data;

[0082] A force distribution diagram of the reference component is generated based on the position coordinates and the pressure value.

[0083] In the technical solution of this invention embodiment, the pressure distribution information includes the force distribution diagram of the reference component. First, the position coordinates of each position on the reference component are determined, and the pressure value corresponding to the position coordinate is obtained according to the pressure data. Then, the force distribution diagram is generated according to the position coordinate and the pressure value, thereby providing a visual reference for judging the pressure uniformity.

[0084] In some embodiments, calculating the downward tilt angle of pressing down on the reference member based on the pressure data includes:

[0085] Input the pressure data into a preset tilt model;

[0086] The downward tilt angle of the reference component is calculated based on the preset tilt angle model.

[0087] In the technical solution of this invention embodiment, pressure data is input into a preset tilt model, and the downward tilt of the pressing module is calculated based on the preset tilt model, thereby improving the accuracy of downward tilt detection.

[0088] In some embodiments, the preset tilt model is a plane equation representing the pressure distribution on the reference member, and the step of inputting the pressure data into the preset tilt model and calculating the downward tilt angle pressing down on the reference member based on the preset tilt model includes:

[0089] The position coordinates and pressure values ​​of each location on the reference component are determined based on the pressure data.

[0090] Input the position coordinates and the pressure value into the plane equation, solve for the slope parameter in the plane equation, and calculate the downward tilt of the downward module based on the slope parameter.

[0091] In the technical solution of this invention embodiment, the position coordinates of each position on the reference component are first determined, and the pressure value corresponding to the position coordinate is obtained according to the pressure data. The position coordinates and pressure value are then input into the plane equation to solve the slope parameter in the plane equation. Based on the slope parameter, the downward tilt of the pressing module is calculated, thereby further improving the accuracy of the downward tilt detection.

[0092] In some embodiments, after calculating the downward tilt angle of pressing down on the reference member based on the pressure data, the method further includes:

[0093] Calculate the tilt adjustment value based on the downward tilt angle;

[0094] Adjust the tilt angle of the reference component according to the tilt adjustment value.

[0095] In the technical solution of this invention embodiment, the tilt adjustment value is calculated based on the downward tilt angle, and the tilt angle of the downward module is adjusted based on the tilt adjustment value, thereby ensuring that the bare cell is subjected to uniform pressure and avoiding problems of excessive or insufficient local pressure caused by tilt.

[0096] In some embodiments, the sensor includes a displacement gauge disposed on a support column of the reference member, the sensing data includes displacement data, and the compression information includes compression depth information. The step of acquiring sensing data of the reference member during the compression process through the sensor, and obtaining compression information of the reference member based on the sensing data, includes:

[0097] The displacement data of the reference component during the compression process are obtained through the displacement gauge;

[0098] The pressing depth information of the reference component is calculated based on the displacement data.

[0099] In the technical solution of this invention embodiment, the sensor includes a displacement gauge, which is disposed on the support column of the reference component. The displacement gauge generates displacement data of the reference component during the compression process, and calculates the compression depth information based on the displacement data, thereby enabling accurate detection of the compression depth information during the compression process.

[0100] In some embodiments, the compression depth information includes: an average compression depth and a compression depth deviation; calculating the compression depth information of the reference member based on the displacement data includes:

[0101] Calculate the average pressing depth of the reference component based on the displacement data;

[0102] The deviation value of the pressing depth of the reference component is calculated based on the average pressing depth.

[0103] In the technical solution of this invention, the compression depth information includes the average compression depth and the compression depth deviation value. The average compression depth and the compression depth deviation value are calculated based on the displacement data, thereby further improving the accuracy of the compression depth information.

[0104] In some embodiments, after calculating the average pressing depth of the reference member based on the displacement data, the method further includes:

[0105] Obtain the initial height of the reference component and the specified height of the wound bare cell, and calculate the height deviation value based on the initial height, the specified height, and the average pressing depth.

[0106] The pressing depth adjustment value is determined based on the height deviation value, and the pressing depth of the reference part is adjusted based on the pressing depth adjustment value.

[0107] In the technical solution of this invention embodiment, the height deviation value is calculated based on the initial height of the reference component, the specification height of the wound bare cell, and the average value of the pressing depth. The pressing depth adjustment value is determined based on the height deviation value to adjust the pressing depth, thereby avoiding pressing too deep or too shallow and reducing the risk of winding GAP.

[0108] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0109] Figure 1 This is a structural diagram of a pressure testing system according to some embodiments of the present invention;

[0110] Figure 2 This is another structural diagram of the pressure testing system according to some embodiments of the present invention;

[0111] Figure 3 This is a schematic diagram of an elastically stretchable reference component according to some embodiments of the present invention;

[0112] Figure 4 This is another structural diagram of the pressure testing system according to some embodiments of the present invention;

[0113] Figure 5 This is another structural diagram of the pressure testing system according to some embodiments of the present invention;

[0114] Figure 6a , Figure 6b , Figure 6c , Figure 6d as well as Figure 6eThis is a flowchart illustrating the working process of the pressure testing system according to some embodiments of the present invention;

[0115] Figure 7 This is a schematic diagram of the downward displacement analysis model for some embodiments of the present invention;

[0116] Figure 8 These are schematic diagrams of force analysis models for some embodiments of the present invention;

[0117] Figure 9 This describes the control interaction flow of some embodiments of the present invention;

[0118] Figure 10 This is a flowchart of a pressure test correction method according to some embodiments of the present invention;

[0119] Figure 11 This is a flowchart of a pressure test correction method according to some embodiments of the present invention;

[0120] Figure 12 This is a flowchart of a pressure test correction method according to some embodiments of the present invention.

[0121] The reference numerals in the detailed embodiments are as follows:

[0122] The components include a pressing module 10, an intermediate pressure plate 11, a pre-pressure plate 12, a reference component 20, a pressure array 21, a displacement gauge 22, a calculation module 30, a carrier platform 40, a control module 50, an alarm module 60, and a feeding clamp needle 70. Detailed Implementation

[0123] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0124] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the invention, are intended to cover non-exclusive inclusion.

[0125] In the description of the embodiments of this invention, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this invention, "multiple" means two or more, unless otherwise explicitly defined.

[0126] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0127] In the description of the embodiments of this invention, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0128] In the description of the embodiments of the present invention, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more (including two groups), and "multiple pieces" refers to two or more (including two pieces).

[0129] In the description of the embodiments of the present invention, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0130] In the description of the embodiments of this invention, unless otherwise explicitly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this invention according to the specific circumstances. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0131] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0132] In lithium battery manufacturing, the winding process involves stacking the positive electrode, negative electrode, and separator (insulating layer) in the order of "positive electrode-separator-negative electrode-separator" and then winding them into a "bare cell" using a winding machine. During the winding process, the bare cell pressing process (such as separator tension, material extrusion pressure, electrode collapse force, parallelism of clamping pins, electrode free space, pressing parallelism, and material feeding stability) can easily lead to gaps (GAPs) in the inner ring of the bare cell. GAPs that are too large or too small can have varying degrees of impact on cell capacity, cycle life, safety, internal resistance, and structure. For example, if the GAP is too large, there will be areas where the electrolyte is not sufficiently wetted in the inner ring. During charging, lithium ions cannot be embedded into the graphite layer of the negative electrode in time, and metallic lithium (lithium plating) is easily deposited on the surface of the negative electrode. Lithium dendrites will grow along the "voids" of the GAP. If they penetrate the separator, they will cause a direct short circuit between the positive and negative electrodes, leading to local overheating and even thermal runaway. Excessively small gaps (GAPs) can cause electrode burrs to pierce the pressurized separator, creating "micro-short circuits." These micro-short circuits continuously release heat, and the inner ring's low heat dissipation efficiency (heat is difficult to conduct to the outer ring) easily leads to localized heat accumulation, which may eventually cause cell bulging or combustion. The distance between the intermediate pressure plate and the belt (if the intermediate pressure plate is too low, it leads to poor needle removal, causing friction between the needle clamp and the electrode, resulting in GAPs; if the intermediate pressure plate is too high, it causes the inner ring to sag and wrinkle), the parallelism of the feeding platform and the pre-pressure plate (non-parallelism causes a portion of the bare cell with less force to fail to compact, resulting in GAPs) are all important factors affecting the current inner ring GAP problem.

[0133] Therefore, to address the GAP (gain-off-center alignment) issue within bare battery cells, a pressure test is typically required. Currently, pressure tests primarily involve assessing the distance between the intermediate pressure plate and the belt conveyor, as well as the parallelism of the unloading platform and the pre-pressure plate. The current methods for assessing these parameters mainly rely on manual inspection.

[0134] 1. Height of intermediate pressure plate from belt: After the battery cell is stretched and opened, the intermediate pressure plate is pressed down. At this time, manually control the equipment to stop, open the equipment safety door, and manually use a vernier caliper / pivot gauge to measure the height of the intermediate pressure plate from the belt.

[0135] 2. Parallelism of the unloading platform and the pre-compression plate: After the equipment enters the pre-compression state, manually control the equipment to stop, open the equipment safety door, and manually use a height gauge to measure the height of the unloading platform and the pre-compression plate on both the left and right sides.

[0136] In actual production, manually measuring the height of the intermediate pressure plate from the belt using vernier calipers / pivot gauges is complex and prone to error. This method indirectly provides feedback on whether the friction force between the clamping pins and the electrode sheet, and the component force of the electrode sheet collapse, are within a reasonable range, but it does not check the parallelism between the intermediate pressure plate and the belt. Alternatively, manually measuring the height of the left and right sides of the feeding platform and pre-pressure plate with a height gauge to characterize their parallelism is also complex and prone to error. This method indirectly provides feedback on the downward pressure force on the bare cell surface through parallelism measurement.

[0137] To address the issues of complex operation, low efficiency, and inherent errors in manual point-by-point measurement methods for pressure testing, a reference component can be set up to simulate the pressure state of the wound bare cell during the pressure testing process. Sensors can be used to acquire the sensing data of the reference component during the pressure process, and the pressure information of the pressure testing module can be detected based on the sensing data. This simplifies the pressure testing operation and improves the efficiency and accuracy of the pressure testing.

[0138] In some embodiments, a pressure testing system is provided, comprising: a pressure testing module, a reference component, a calculation module, and a sensor; the pressure testing module is used to apply pressure to the reference component, the reference component being used to simulate the pressure state of a wound bare cell during the pressure testing process; the sensor is used to acquire sensing data of the reference component during the pressure testing process and send the sensing data to the calculation module; the calculation module is used to obtain the pressure information of the pressure testing module based on the sensing data.

[0139] The pressing module can include an intermediate pressure plate, a pre-pressure plate, and a drive assembly. It responds to inspection commands and drives the pressure plate to press down on the reference component, making it the core execution component for the bare cell compaction process. The reference component can refer to an elastically stretchable Master, where "Master" indicates a reference component or master mold, and "elastically stretchable" indicates its ability to deform and expand elastically. This type of component can serve as a flexible reference or calibration tool to adapt to dynamic dimensional changes. For example, in practical applications, when the intermediate pressure plate presses down, the middle section of the Master can sink accordingly to accurately simulate the actual pressing production of the wound bare cell. Elastic deformation accommodates dimensional fluctuations, improving the system's adaptability and fault tolerance. The sensor can refer to a detection element installed at a preset detection position. This preset detection position can be pre-set or it can refer to a detection element installed on the elastically stretchable reference component, used to generate sensing data of the reference component during the pressing process. In specific implementations, the sensor includes, but is not limited to, pressure sensors and displacement sensors; this embodiment does not impose any limitations on this. The calculation module can refer to an analysis unit composed of hardware (data receiving interface) and software (algorithm service, control software). Its core function is to receive sensor data transmitted from the sensor, process the data through preset algorithms (such as least squares method, standard deviation / range calculation), and finally output the pressure information of the pressure module (such as force uniformity, whether the tilt needs to be adjusted, whether the pressure depth is compliant, etc.). The pressure information can refer to the core conclusions output by the calculation module after processing the sensor data, covering the evaluation results of key parameters in the pressure process, which may include pressure uniformity, pressure tilt, and pressure depth information, etc. This embodiment does not limit this.

[0140] For ease of understanding, please refer to Figure 1 , Figure 2 as well as Figure 3 This description is provided but does not limit the scope of the invention. Figure 1 This is a structural diagram of a pressure testing system according to some embodiments of the present invention. Figure 2 This is another structural diagram of the pressure testing system according to some embodiments of the present invention. Figure 3 This is a schematic diagram of a flexible and scalable reference component according to some embodiments of the present invention. As an example, when an operator issues an inspection command through a Human Machine Interface (HMI), the system enters the inspection process. In a specific implementation, it can be as follows: Figure 1 As shown, the pressure module 10 (such as...) Figure 1 The intermediate pressure plate (in the middle) responds to the inspection command and presses down on the reference piece 20 placed on the carrier platform 40. At this time, the reference piece 20, due to its elastic deformation capability, has its central area concave as the pressure plate is pressed down, accurately replicating the stress and deformation state of the loose bare cell being compacted in actual production, providing a simulation carrier that closely resembles the real working condition for subsequent testing. It can also be used as... Figure 2As shown, the pressure module 10 (such as...) Figure 2 In response to the inspection command, the preload plate is placed on the reference piece 20 on the vehicle platform 40.

[0141] like Figure 3 As shown, at least one sensor is mounted on the reference component 20. The sensor includes, but is not limited to, a pressure array 21 attached to the surface of the reference component 20 and a displacement gauge 22 mounted on a support column of the reference component 20. The pressure array 21 can be a flexible thin-film pressure array, which refers to a device consisting of multiple miniature pressure sensors integrated in an array on a flexible thin-film substrate. The thin-film material (such as polyimide) allows it to bend and conform to irregular surfaces. The array structure can simultaneously collect pressure values ​​at multiple points in a plane, forming a pressure distribution thermogram. The working principle of the flexible thin-film pressure array can be based on the piezoresistive effect (pressure changes the material resistance) or the capacitive effect (pressure changes the electrode spacing / dielectric constant), outputting multi-channel electrical signals. The displacement gauge 22 can be a lever-type potentiometer displacement gauge, which is a sensor that converts mechanical displacement into an electrical signal. Its core structure includes a lever (connected to the object being measured) and a potentiometer (resistive element): when the lever moves with the object, it moves the sliding contact of the potentiometer, changing the resistance value (or voltage division ratio). The displacement can be deduced by measuring the change in resistance.

[0142] like Figure 1 , Figure 2 as well as Figure 3 As shown, while the pressing module 10 is pressing down, the pressure array 21 and the displacement meter 22 start working simultaneously: the pressure array 21 collects the pressure values ​​at each point on the contact surface between the pressing module 10 and the reference component 20 in real time to form pressure data, while the displacement meter 22 collects displacement data through the displacement change of the support column. The two types of sensor data are transmitted to the calculation module 30 in real time at a preset frequency (such as 100ms / time). After receiving the data, the calculation module 30 first performs preprocessing such as noise reduction and normalization, and then analyzes it through a preset algorithm to obtain the pressing information of the pressing module 10.

[0143] This embodiment uses a reference component to simulate the pressure state of a wound bare cell during the pressure-down process, and uses sensors to acquire the sensing data of the reference component during the pressure-down process. Based on the sensing data, the pressure-down information of the pressure-down module is detected, thereby simplifying the pressure-down test operation and improving the efficiency and accuracy of the pressure-down test.

[0144] In some embodiments, the sensor includes a pressure array disposed on the surface of the reference member, the sensing data includes pressure data, and the pressure information includes pressure uniformity and / or pressure inclination; wherein, the pressure array is used to acquire pressure data of the reference member during the pressure process and send the pressure data to the calculation module; the calculation module is further used to calculate the pressure uniformity and / or pressure inclination of the pressure module based on the pressure data.

[0145] In order to accurately detect the pressure uniformity and pressure tilt during the pressing process, in this embodiment, the sensor includes a pressure array, which is disposed on the surface of the reference component. The pressure array acquires the pressure data of the reference component during the pressing process and sends the pressure data to the calculation module. The calculation module calculates the pressure uniformity and / or pressure tilt of the pressing module based on the pressure data.

[0146] The pressure array can be a flexible thin-film pressure array, which refers to a device consisting of multiple miniature pressure sensors integrated in an array on a flexible thin-film substrate. The thin-film material (such as polyimide) allows it to bend and conform to irregular surfaces. The array structure can simultaneously collect pressure values ​​at multiple points in a plane, forming a pressure distribution thermogram. The working principle of the flexible thin-film pressure array can be based on the piezoresistive effect (pressure changes the material resistance) or the capacitive effect (pressure changes the electrode spacing / dielectric constant), outputting multi-channel electrical signals. Pressure uniformity can be used to measure whether the pressure applied by the pressing module is evenly distributed on the surface of the reference piece. Pressing tilt can be used to measure whether the pressing module is in a horizontal position.

[0147] In the specific implementation, the calculation module calculates the pressure uniformity and / or downward tilt of the pressing module based on the pressure data through a force analysis model. The force analysis model can be a pre-set data analysis model, and this embodiment does not limit it.

[0148] In this embodiment, the sensor includes a pressure array, which is disposed on the surface of the reference component. The pressure array acquires the pressure data of the reference component during the pressing process and sends the pressure data to the calculation module. The calculation module calculates the pressure uniformity and / or pressing tilt of the pressing module based on the pressure data, thereby accurately detecting the pressure uniformity and pressing tilt during the pressing process.

[0149] In some embodiments, the calculation module is further configured to generate pressure distribution information on the reference component based on the pressure data, and calculate the pressure uniformity of the pressing module based on the pressure distribution information.

[0150] To improve the accuracy of pressure uniformity detection, in this embodiment, pressure distribution information on the reference component is first generated based on the pressure data, and then the pressure uniformity of the pressing module is calculated based on the pressure distribution information.

[0151] Among them, pressure distribution information can refer to information generated based on pressure data that intuitively reflects the spatial distribution of pressure on the surface of the reference part. For example, pressure distribution information can be a two-dimensional array including coordinates and pressure. In the specific implementation, the calculation module first receives the two-dimensional data of "coordinate-pressure value" returned by the pressure array at a preset frequency (such as 100ms / time), and at the same time collects the status information of the workstation where the reference part is located (such as the type of the pressing module and the current pressing stage). The timing alignment algorithm ensures that the pressure data corresponds one-to-one with the workstation status, avoiding misalignment caused by data transmission delay (such as mismatching the pressure data of the pre-pressing plate to the intermediate pressing plate). The received raw pressure data is cleaned and standardized: (1) noise reduction to filter out abnormal values ​​caused by small fluctuations of the sensor (such as instantaneous jumps in ultra-high pressure / ultra-low pressure data); (2) normalization to unify the output signals of different micro sensors to the preset range and eliminate errors caused by individual differences of the sensors; (3) format conversion to organize the discrete "coordinate-pressure" data into a two-dimensional array (such as This facilitates subsequent analysis.

[0152] In this embodiment, pressure distribution information on the reference component is first generated based on pressure data, and then the pressure uniformity of the pressing module is calculated based on the pressure distribution information, thereby improving the accuracy of pressure uniformity detection.

[0153] In some embodiments, the calculation module is further configured to calculate pressure dispersion evaluation parameters at various locations on the reference component based on the pressure distribution information, and to calculate the pressure uniformity of the pressing module based on the pressure dispersion evaluation parameters.

[0154] In order to quantify the pressure uniformity and improve its accuracy, in this embodiment, the pressure dispersion evaluation parameters at each position on the reference component are first calculated based on the pressure distribution information, and the pressure uniformity of the pressing module is calculated based on the pressure dispersion evaluation parameters.

[0155] Among them, the pressure dispersion evaluation parameter can refer to a multi-dimensional index used to quantify the dispersion of pressure distribution at various locations on the surface of a reference component. In specific implementations, the pressure dispersion evaluation parameter includes, but is not limited to, the pressure standard deviation ( Pressure range (R), coefficient of variation (CV), interquartile range (IQR), and mean absolute deviation (MAD). Pressure standard deviation ( The pressure range (R) reflects the degree of deviation of all pressure data from the mean. It is calculated by first calculating the sum of squares of the deviations of each pressure value from the mean, then taking the square root of the mean to quantify the overall dispersion of the pressure data. The coefficient of variation (CV) reflects the maximum range of pressure data fluctuations, calculated by subtracting the minimum value from the maximum value. The CV is a relative dispersion index, the ratio of the pressure standard deviation to the pressure mean, suitable for comparing dispersion at different average pressure levels, avoiding misjudgments of dispersion due to mean differences. The interquartile range (IQR) is a dispersion index resistant to outliers, the difference between the upper quartile (Q3, the value at the 75th percentile after data sorting) and the lower quartile (Q1, the value at the 25th percentile after data sorting) (IQR = Q3 - Q1), reducing the interference of extreme pressure values ​​on dispersion evaluation. The mean absolute deviation (MAD) reflects the average level of absolute deviation of pressure data from the mean, and is the arithmetic mean of the absolute differences between each pressure value and the mean.

[0156] In this embodiment, the pressure dispersion evaluation parameters at each position on the reference component are first calculated based on the pressure distribution information, and the pressure uniformity of the pressing module is calculated based on the pressure dispersion evaluation parameters, thereby enabling the quantification of pressure uniformity and improving the accuracy of pressure uniformity.

[0157] In some embodiments, the pressure dispersion evaluation parameters include pressure standard deviation and pressure range.

[0158] To further improve the accuracy of pressure uniformity detection, in this embodiment, the pressure dispersion evaluation parameters include pressure standard deviation and pressure range. The pressure uniformity of the pressure module is calculated by combining the pressure standard deviation and pressure range.

[0159] Among them, the standard deviation of pressure ( The standard deviation (SD) can refer to a statistical measure describing the dispersion of pressure values ​​from the average value in the pressure data. In this embodiment, the smaller the standard deviation, the more concentrated the pressure distribution, reflecting a more uniform pressure exerted by the pressure plate of the pressure module on the reference component. The pressure range can refer to the difference between the maximum and minimum pressure values ​​in the pressure data, and is an indicator that directly reflects the range of pressure distribution fluctuations. The smaller the range, the smaller the extreme differences in the pressure distribution, allowing for a quick preliminary assessment of pressure uniformity.

[0160] In the specific implementation, the calculation module organizes the discrete "coordinate-pressure" data into a two-dimensional array (such as...). After that, calculate two key statistics: the standard deviation of pressure ( First, calculate the average of all pressure values. Then calculate the sum of squares of the deviations of each pressure value from the average value, divide by the number of data points n, and take the square root to obtain... This reflects the dispersion of pressure distribution. Pressure range: filters out the maximum pressure value in the data. and minimum pressure value Calculate the difference between the two ( This reflects the range of pressure distribution fluctuations. The calculated values... and range and preset threshold ( ≤5N / cm 2 And the range is ≤15N / cm 2 Comparison: If all thresholds are met simultaneously, the pressure is considered uniform, and the bare cells have no risk of GAP (Gas Apparent Apparent Surface Damage) due to uneven stress; if any indicator exceeds the threshold, a high-voltage zone is marked. Much larger ) and low-pressure areas ( much smaller The area marked as high risk indicates uneven pressure.

[0161] In this embodiment, the force dispersion evaluation parameters include pressure standard deviation and pressure range. The pressure uniformity of the pressure module is calculated by combining the pressure standard deviation and pressure range, thereby further improving the accuracy of pressure uniformity detection.

[0162] In some embodiments, the pressure distribution information includes a force distribution diagram of the reference component. The calculation module is further configured to determine the position coordinates of each position on the reference component, obtain the pressure value corresponding to the position coordinates based on the pressure data, and generate a force distribution diagram based on the position coordinates and the pressure value.

[0163] To provide a visual reference for judging pressure uniformity, in this embodiment, the pressure distribution information includes a force distribution diagram of the reference component. First, the position coordinates of each position on the reference component are determined, and the pressure value corresponding to the position coordinate is obtained according to the pressure data. Then, a force distribution diagram is generated based on the position coordinate and the pressure value.

[0164] The force distribution diagram refers to a graphical representation of the pressure distribution generated by the calculation module after visualizing the pressure data. This is achieved by setting a pressure threshold range (e.g., 0-50 N / cm²). 2 The system uses a three-color gradient of red (high pressure zone), yellow (medium pressure zone), and blue (low pressure zone) to present the magnitude of the force at different locations on the surface of the reference component. This can intuitively reflect the pressure distribution differences of the pressure plate (intermediate pressure plate, pre-pressure plate) acting on the reference component, providing operators with a visual reference for quickly judging the pressure uniformity.

[0165] In the specific implementation, the calculation module organizes the discrete "coordinate-pressure" data into a two-dimensional array (such as...). After that, based on the processed data, the correspondence between pressure values ​​and colors is set (e.g., 0-15 N / cm). 2It is blue and has a strength of 15-35 N / cm. 2 Yellow, 35-50 N / cm 2 (in red), according to coordinates Each pressure value The corresponding colors are filled into the graphical interface to form a force distribution map covering the entire pressure surface of the reference part, visually presenting the pressure distribution differences. After generating the force distribution map, the calculation module automatically extracts the values ​​of all pressure data points in the map and performs subsequent steps to calculate the pressure uniformity.

[0166] In this embodiment, the pressure distribution information includes the force distribution diagram of the reference component. First, the position coordinates of each position on the reference component are determined, and the pressure value corresponding to the position coordinate is obtained according to the pressure data. Then, the force distribution diagram is generated based on the position coordinate and the pressure value, which can provide a visual reference for judging the pressure uniformity.

[0167] In some embodiments, the calculation module is further configured to input the pressure data into a preset tilt model and calculate the downward tilt of the downward module based on the preset tilt model.

[0168] To improve the accuracy of the downward tilt detection, in this embodiment, the pressure data is input into a preset tilt model, and the downward tilt of the pressing module is calculated based on the preset tilt model.

[0169] The preset tilt model can refer to a mathematical model used to calculate the tilt angle of the pressing module. This preset tilt model can be set in advance, and this implementation does not impose any restrictions on it. The pressing tilt angle can refer to a quantitative indicator measuring the deviation of the pressing module from a horizontal state, comprising two dimensions: one is the tilt angle around the x-axis (…). (Pitch angle, reflecting the degree of tilt of the module along the x-axis), and secondly, the tilt angle around the y-axis. (Roll angle, reflecting the degree of tilt of the module along the y-axis); when , When the value is 0, the pressure module is in a horizontal state with uniform pressure distribution; otherwise, it is tilted and needs to be corrected by adjusting the angle.

[0170] In this embodiment, pressure data is input into a preset tilt model, and the downward tilt of the pressing module is calculated based on the preset tilt model, thereby improving the accuracy of downward tilt detection.

[0171] In some embodiments, the preset tilt model is a plane equation representing the pressure distribution on the reference component. The calculation module is further configured to determine the position coordinates of each position on the reference component, obtain the pressure value corresponding to the position coordinates based on the pressure data, input the position coordinates and the pressure value into the plane equation, solve the slope parameter in the plane equation, and calculate the downward tilt of the pressing module based on the slope parameter.

[0172] The tilt model can be a mathematical model constructed based on pressure data to describe the tilt state of the pressure plate of the pressure module. The core assumption is that the pressure distribution on the surface of the reference part conforms to the plane equation P(x,y)=ax+by+c (P(x,y) is the pressure value at coordinate (x,y), a and b are plane slope parameters, and c is a constant term). The parameters a, b, and c are obtained by fitting the pressure data points using the least squares method, and then the tilt degree of the pressure plate is quantified.

[0173] In the specific implementation, it is assumed that the pressure distribution on the upper surface of the lower pressure plate can be represented by a plane equation: P(x,y)=ax+by+c, where: P(x,y) represents the pressure value at coordinates (x,y), a and b are the slope parameters of the plane, and c is a constant term. The tilt adjustment value of the intermediate pressure plate and the pre-pressure plate is output based on the thermal distribution. The pressure data points are fitted using the least squares method. The coefficients a, b, and c can be obtained:

[0174]

[0175]

[0176] Where n is the number of data points. These are the coordinates of the i-th data point. It is the pressure value of the i-th data point.

[0177] The tilt of the lower pressure plate can be described by two angular parameters. This represents the tilt angle (pitch angle) around the x-axis. These represent the tilt angle (roll angle) about the y-axis, and these two angles correspond to the slope parameters b and a in the plane equation, respectively. Tilting angle and It can be calculated using the following formula:

[0178]

[0179]

[0180] in, It is the tilt angle about the x-axis. is the tilt angle around the y-axis, and a and b are slope parameters obtained from plane fitting. These two angles represent the degree of tilt of the pressure plate relative to the ideal horizontal position. When or When the value is zero, the lower pressure plate is in a horizontal state.

[0181] In this embodiment, the position coordinates of each position on the reference component are first determined, and the pressure value corresponding to the position coordinate is obtained according to the pressure data. The position coordinates and pressure value are then input into the plane equation to solve the slope parameter in the plane equation. Based on the slope parameter, the downward tilt of the pressing module is calculated, thereby further improving the accuracy of the downward tilt detection.

[0182] In some embodiments, the pressure testing system further includes: a control module; the calculation module is further configured to calculate a tilt adjustment value based on the pressure tilt angle and send the tilt adjustment value to the control module; the control module is further configured to adjust the tilt angle of the pressure module based on the tilt adjustment value.

[0183] To ensure uniform pressure on the bare cells and avoid problems such as excessive local pressure (puncturing the diaphragm) or insufficient local pressure (failing to compact and causing GAP) due to tilting, this embodiment calculates the tilt adjustment value based on the downward tilt and adjusts the tilt angle of the downward module according to the tilt adjustment value.

[0184] The control module, in this context, refers to the execution control unit within the pressure testing system. Its core function is to receive the tilt adjustment value sent by the calculation module, convert it into control commands executable by the equipment, and drive the pressure module to complete the tilt angle correction. The tilt adjustment value is the target angle value used to correct the tilt of the pressure plate, calculated by the calculation module based on the pressure tilt. Essentially, it is the opposite of the current tilt angle. By driving the pressure plate to adjust this angle through the control module, the pressure plate can be restored to a horizontal state.

[0185] For ease of understanding, please refer to Figure 4 This description is provided but does not limit the scope of the invention. Figure 4 This is another structural diagram of the pressure testing system according to some embodiments of the present invention. As an example, it is assumed that the pressure module 10 is an intermediate pressure plate, and the calculation module 30 receives the pressure data (two-dimensional array) transmitted by the pressure array. , coordinates First, the data undergoes denoising and normalization preprocessing. Then, a slope model P(x,y)=ax+by+c is fitted using the least squares method to solve for the slope parameters a and b. Subsequently, based on the pressure value, the slope parameters a and b are calculated. , Calculate the downward tilt angle. If the angle exceeds a preset threshold (e.g., absolute value > 1°), then press... , Calculate the tilt adjustment value to determine the direction and angle that the pressure plate needs to be corrected. Calculation module 30 will then calculate the tilt adjustment value (…). , The adjustment value is sent to the control module 50 via a data interface (such as Ethernet or serial port). After receiving the adjustment value, the control software of the control module 50 first verifies its validity to determine whether the adjustment value meets the equipment process requirements (such as whether the adjustment angle range is within the maximum stroke of the servo motor or exceeds the mechanical limit of the pressure plate). After the verification is passed, the angle value is converted into a control signal that the equipment can recognize (such as pulse count or voltage signal). For example, if the angle is adjusted around the x-axis... =1.72°, the number of pulses required for the servo motor to rotate is calculated from parameters such as the motor reduction ratio and the lead screw. The control module 50 sends the converted control signal to the drive component of the pressing module 10 (such as a servo motor that controls the tilt of the pressure plate); the servo motor drives the ball screw or gear mechanism according to the instruction, causing the pressure plate to rotate around the x-axis and y-axis by the corresponding angle (such as by...). =1.72° =4.85° adjustment); During the adjustment process, the pressure array collects pressure data in real time and feeds it back to the calculation module 30. The calculation module 30 recalculates the downward tilt angle. If the angle returns to the threshold (absolute value ≤ 1°), the control module 50 stops the adjustment and completes the correction; if it does not meet the standard, the "adjustment-feedback-calculation" process is repeated until the pressure plate is horizontal.

[0186] In this embodiment, the tilt adjustment value is calculated based on the downward tilt angle, and the tilt angle of the downward module is adjusted according to the tilt adjustment value. This ensures that the bare cell is subjected to uniform pressure and avoids problems such as excessive or insufficient local pressure caused by tilting.

[0187] In some embodiments, the pressure test system further includes: an alarm module; the calculation module is further configured to determine the tilt alarm level corresponding to the pressure tilt, and send the tilt alarm level to the alarm module, wherein the larger the pressure tilt, the higher the tilt alarm level; the alarm module is further configured to generate tilt alarm information according to the tilt alarm level, and issue an alarm according to the tilt alarm information.

[0188] To ensure that operators can quickly grasp the details of the risks, in this embodiment, the tilt alarm level corresponding to the downward tilt is determined, and tilt alarm information is generated based on the tilt alarm level.

[0189] The tilt alarm level refers to the risk level determined by the calculation module based on the comparison between the downward tilt and the preset safety threshold. In the appendix, it can be set to three levels according to the process requirements: (1) mild risk; (2) moderate risk; (3) high risk. The higher the level, the greater the impact of the pressure plate tilt on the quality of the bare cell. The tilt alarm information refers to the specific warning content generated by the alarm module based on the tilt alarm level, including the risk level, tilt angle value, affected area (such as "tilt around the x-axis, corresponding to uneven pressure on the left side of the bare cell") and handling suggestions (such as "mild risk: it is recommended to adjust during the next inspection; high risk: stop the machine immediately for adjustment"). It is output synchronously through sound and light, pop-up windows, etc., to ensure that operators can quickly grasp the risk details.

[0190] For ease of understanding, please refer to Figure 5 This description is provided but does not limit the scope of the invention. Figure 5 This is another structural diagram of the pressure testing system according to some embodiments of the present invention. As an example, assuming that the pressure module 10 is the middle pressure plate, after the calculation module 30 calculates the actual tilt angle, it compares it with the preset threshold to determine the tilt alarm level, and then sends the tilt alarm level and the corresponding tilt angle data to the alarm module 60. After receiving the tilt alarm level sent by the calculation module 30, the alarm module 60 generates differentiated alarm information according to the level: (1) Mild risk: generates the text message "The tilt is slightly abnormal. It is recommended to adjust it during the next inspection. Production can continue." This triggers a yellow pop-up warning on the HMI interface, and the hardware indicator light is "always yellow." (2) Moderate risk: generates the text message "The tilt is moderately abnormal. There is a risk of GAP in the bare cell. It is recommended to suspend production for adjustment." This triggers an orange pop-up window on the HMI interface (including the "Confirm Adjustment" button), the hardware sound and light alarm "sounds once every 2 seconds," and the indicator light "flashes orange." (3) High risk: generates the text message "The tilt is seriously abnormal. Stop the machine immediately!" This triggers a red pop-up window on the HMI interface (forced stop. You need to click "Emergency Stop" to confirm), the hardware sound and light alarm "sounds continuously," and the indicator light "flashes red quickly." At the same time, it sends a "Suggest Stop" signal to the control module.

[0191] This embodiment determines the tilt alarm level corresponding to the downward tilt angle and generates tilt alarm information based on the tilt alarm level, thereby ensuring that operators can quickly grasp the details of the risk.

[0192] In some embodiments, the sensor includes a displacement gauge disposed on the support column of the reference member, the sensing data includes displacement data, and the compression information includes compression depth information; wherein, the displacement gauge is used to acquire the displacement data of the reference member during the compression process and send the displacement data to the calculation module; the calculation module is used to calculate the compression depth information of the compression module based on the displacement data.

[0193] In order to accurately detect the compression depth information during the compression process, in this embodiment, the sensor includes a displacement gauge, which is set on the support column of the reference component. The displacement gauge generates displacement data of the reference component during the compression process, and the compression depth information of the compression module is calculated based on the displacement data.

[0194] Specifically, a flexible, retractable potentiometer-type displacement gauge attached to the Master surface is used to accurately detect the pressing depth of the intermediate pressure plate, and the data is input into the model to calculate the average displacement. Displacement deviation , The logic used to determine whether the displacement consistency is good and whether the pressing depth is appropriate is as follows: Wherein, the specification height = fluffiness of the battery cell thickness + thickness of the clamping pin + (x mm), It is used to determine whether there is a risk of gaps and outputs the pressure depth adjustment value.

[0195] In this embodiment, the sensor includes a displacement gauge, which is mounted on the support column of the reference component. The displacement gauge generates displacement data of the reference component during the compression process, and calculates the compression depth information of the compression module based on the displacement data, thereby enabling accurate detection of the compression depth information during the compression process.

[0196] In some embodiments, the compression depth information includes: an average compression depth and a compression depth deviation value; the calculation module is further configured to calculate the average compression depth of the compression module based on the displacement data; the calculation module is further configured to calculate the compression depth deviation value of the compression module based on the average compression depth.

[0197] To further improve the accuracy of the compression depth information, in this embodiment, the compression depth information includes the average compression depth and the compression depth deviation value, which are calculated based on the displacement data.

[0198] Among them, the average depth of compression ( This could refer to the arithmetic mean obtained by the calculation module from the statistical analysis of the displacement data of the four support columns. The calculation formula is as follows: This represents the average vertical displacement of the reference component after it is subjected to overall compression, indirectly reflecting the actual compression depth of the compression module. It is a core parameter for subsequent calculation of deviation values ​​and determination of GAP risk. Compression depth deviation value ( This can refer to the absolute difference between the displacement of a single support column and the average downward pressure depth, calculated using the following formula: This is used to determine the consistency of displacement data (i.e., whether the displacement of the four support columns is uniform), with a preset threshold of [value missing]. ≤0.5cm; if it exceeds this value, it indicates uneven pressure on the reference component, and the data cannot be used for subsequent GAP risk assessment.

[0199] In this embodiment, the compression depth information includes the average compression depth and the compression depth deviation value. The average compression depth and the compression depth deviation value are calculated based on the displacement data, thereby further improving the accuracy of the compression depth information.

[0200] In some embodiments, the pressure testing system further includes: a control module; a calculation module configured to acquire the initial height of the reference component and the specified height of the wound bare cell, and calculate a height deviation value based on the initial height, the specified height, and the average pressure depth; the calculation module configured to determine a pressure depth adjustment value based on the height deviation value, and send the pressure depth adjustment value to the control module; the control module configured to adjust the pressure depth of the pressure module based on the pressure depth adjustment value.

[0201] To reduce the risk of excessive pressure (too small GAP, electrode burrs piercing the separator and causing micro-short circuits) or excessive pressure (too large GAP, insufficient electrolyte wetting and causing lithium plating), in this embodiment, the height deviation value is calculated based on the initial height of the reference component, the specification height of the wound bare cell, and the average pressure depth, and the pressure depth adjustment value is determined based on the height deviation value to adjust the pressure depth.

[0202] The initial height of the reference component can refer to the original height of the elastic and retractable reference component (elastic and retractable Master) when it is not under pressure. The specification height of the wound bare cell can refer to the process target height of the bare cell pressing process, calculated as specification height = fluffiness of the cell + thickness of the clamping pin + x, where x is a preset process compensation value in mm. Height deviation value ( This can refer to the absolute difference between the actual equivalent depth of compression and the specified height, calculated using the following formula: Used to quantify the deviation between the pressing depth and the process standard, such as ≤1mm (risk-free), 2mm> >1mm (mild risk), 3mm> >2mm (moderate risk) >3mm (height risk). The compression depth adjustment value can refer to the target adjustment amount derived by the calculation module based on the height deviation value, which aims to bring the compression depth back to the specified height. The calculation logic is: Adjustment value = (Initial height of reference part - ... - Specification height (if positive, the pressing depth needs to be reduced; if negative, the pressing depth needs to be increased) is essentially a compensation amount to eliminate height deviation, providing the control module with a clear direction and value for parameter adjustment.

[0203] This embodiment calculates the height deviation value based on the initial height of the reference component, the specification height of the wound bare cell, and the average value of the pressing depth. The pressing depth is then adjusted based on the height deviation value to avoid pressing too deep or too shallow, thereby reducing the risk of winding GAP.

[0204] In some embodiments, the pressure test system further includes: an alarm module; the calculation module is further configured to determine the pressure depth alarm level corresponding to the height deviation value, and send the pressure depth alarm level to the alarm module, wherein the larger the height deviation value, the higher the pressure depth alarm level; the alarm module is configured to generate pressure depth alarm information according to the pressure depth alarm level, and issue an alarm based on the pressure depth alarm information.

[0205] To ensure that operators can quickly grasp the details of the risks, in this embodiment, the pressure depth alarm level corresponding to the height deviation value is determined, and the tilt is generated based on the tilt alarm level.

[0206] Among them, the pressure depth alarm level can refer to the risk level divided by the calculation module according to the height deviation value and the preset safety threshold, and set to four levels in combination with process requirements: (1) No risk ( ≤1mm, (2) Mild risk (2mm> >1mm, (3) Moderate risk (3mm> >2mm, (4) High risk >3mm). The higher the level, the more serious the deviation of the undervoltage depth from the standard, and the higher the probability of GAP problems in the bare cell (too large leads to lithium plating, too small leads to micro-short circuits). Undervoltage depth alarm information can refer to the specific warning content generated by the alarm module according to the undervoltage depth alarm level, including risk level, height deviation value ( The system provides current pressure depth data, impact analysis (e.g., "Excessive pressure can lead to a small gap and cause a micro-short circuit"), and handling suggestions (e.g., "Mild risk: It is recommended to adjust during the next inspection; High risk: Stop the machine immediately for adjustment"). Through multi-dimensional warnings, operators can quickly grasp the details of the risks and take corresponding measures.

[0207] This embodiment determines the pressure depth alarm level corresponding to the height deviation value, and generates the tilt degree based on the tilt degree alarm level, thereby ensuring that operators can quickly grasp the details of the risk.

[0208] In some embodiments, the pressing module includes a first pressure plate and / or a second pressure plate. The first pressure plate is used to press down a preset middle region of the reference piece, and the second pressure plate is used to press down a preset overall region of the reference piece after the reference piece has been pressed down by the first pressure plate and the feeding clamp needle has been pulled out.

[0209] In order to achieve full-dimensional detection of the wound GAP, in this embodiment, the pressing module includes a first pressing plate and / or a second pressing plate. The first pressing plate is used to press down the preset middle area of ​​the reference part, and the second pressing plate is used to press down the preset overall area of ​​the reference part after the reference part has been pressed down by the first pressing plate and the feeding clamp needle has been pulled out.

[0210] The first pressure plate, which can be the intermediate pressure plate, is designed to apply pressure to a pre-defined central area of ​​the elastic, stretchable master reference component. Its area matches the recessed central area of ​​the master component, simulating the pressure scenario of the inner ring of the wound bare cell. By precisely controlling the pressure and depth, it lays the foundation for subsequent overall compaction and is a key component for detecting inner ring GAP (gaps) risks. The second pressure plate, which can be the pre-pressure plate, is activated after the first pressure plate completes the pressure in the central area and the feeding pins are withdrawn. It applies pressure to the entire surface of the master component. Its area covers the entire upper surface of the master component, simulating the overall pressure process of the bare cell. This is used to detect the overall uniformity of force and avoid winding GAP problems caused by uneven local compaction. The feeding clamp needle refers to the slender metal needle-like component used in winding equipment to fix bare battery cells (or reference parts). Before the first pressure plate is pressed down, the clamp needle passes through the reference part (simulating the production state of the bare battery cell being fixed by the clamp needle) to ensure that the reference part is stable in position when it is pressed down in the middle area. After the first pressure plate has completed the compaction of the middle area, the clamp needle is pulled out to avoid interfering with the overall pressing action of the second pressure plate. Its parallelism and the smoothness of its pull-out are also factors affecting the winding GAP.

[0211] The pressing module in this embodiment includes a first pressing plate and / or a second pressing plate. The first pressing plate is used to press down a preset middle area of ​​the reference part. The second pressing plate is used to press down a preset overall area of ​​the reference part after the reference part has been pressed down by the first pressing plate and the feeding clamp needle has been pulled out, thereby enabling full-dimensional detection of the wound GAP.

[0212] In some embodiments, the pressure testing system further includes: a needle clamping control module and a carrier platform; wherein, the needle clamping control module is used to place the feeding needle into the reference piece and control the feeding needle to open; the carrier platform is used to drive the reference piece to move relative to the pressure module; the needle clamping control module is also used to extract the feeding needle from the reference piece after the first pressure plate has finished pressing down.

[0213] For ease of understanding, please refer to Figure 3 , Figure 6a , Figure 6b , Figure 6c , Figure 6d , Figure 6e , Figure 7 , Figure 8 as well as Figure 9 To explain, Figure 6a , Figure 6b , Figure 6c , Figure 6d as well as Figure 6e This is a flowchart illustrating the working process of the pressure testing system according to some embodiments of the present invention. Figure 7 This is a schematic diagram of the downward displacement analysis model for some embodiments of the present invention. Figure 8 This is a schematic diagram of the force analysis model for some embodiments of the present invention. Figure 9 The control interaction flow of some embodiments of the present invention is shown as an example, such as Figure 9 As shown, the pressure test method includes the following steps:

[0214] Step 1: Click "One-click to enter inspection" on the HMI interface. The system will automatically switch to inspection mode. Figure 6a As shown, the feeding clamp 70 is sent out, and the reference part 20 (such as the elastic and stretchable Master) is placed into the feeding clamp 70. Click "Ready" on the HMI to start the inspection.

[0215] Step Two: As Figure 6b As shown, the feeding clamps open 70 degrees to fit the dimensions of the reference part and fix its position;

[0216] Step 3: After the feeding clamp 70 opens, the carrier platform 40 starts and transfers the fixed reference part 20 from the feeding station to the intermediate pressure plate station corresponding to the intermediate pressure plate.

[0217] Step 4: As Figure 6c As shown, when the intermediate pressure plate 11 is pressed down, the middle part of the reference piece 20 is also pressed down, as... Figure 3 As shown, the four support columns are equipped with lever-type potentiometer displacement gauges 22 to accurately sense the pressing depth, and the upper surface is equipped with a flexible thin film pressure array 21 to accurately detect the uniformity of the pressing force.

[0218] Step 5: As Figure 6dAs shown, after the intermediate pressure plate 11 is pressed down, the material clamping needle 70 is pulled out, and then the reference part 20 is sent to the pre-pressing station corresponding to the pre-pressing plate through the carrier platform 40.

[0219] Step 6: As Figure 6e As shown, the pre-press plate 12 is pressed down. Due to the setting of the inspection mode, the pressing pressure is much lower than the production pressure. The large flexible film pressure array above the elastic and stretchable Master accurately detects the uniformity of the force on the pre-press plate.

[0220] Step 7: After pre-compression, the material is directly unloaded via transfer.

[0221] Step 8: When the control module (such as a Programmable Logic Controller (PLC)) enters the inspection mode, it starts the workstation data synchronization task (returning the workstation information of the Master every 100ms). When the reference part 20 is placed into the equipment, it starts the sensor data synchronization task (returning the flexible thin film pressure array sensor data and the lever-type potentiometer displacement sensor data every 100ms). The data is aligned in real time. When the unloading completion signal is received, the control software in the control module assembles the data and sends the data set to the algorithm service in the control module.

[0222] like Figure 7 As shown, the algorithm service in the control module first performs data denoising and normalized feature extraction, and then inputs it into the downward displacement analysis model. This model first calculates the displacement consistency: calculating the average displacement. Displacement deviation , When the displacement is ≤0.5cm, it is considered that the displacement consistency is good and it can be used. To determine the pressing depth, the specified value is: Specification height = Fluffy cell thickness + Pin thickness + x, where x is a preset process compensation value in mm. The determination logic is as follows: , ≤1mm (risk-free), 2mm> >1mm (mild risk), 3mm> >2mm (moderate risk) If the risk level is >3mm (high risk), the model will output an alarm and a recommendation result.

[0223] like Figure 8 As shown, the processed data (a two-dimensional array containing X / Y coordinates and corresponding pressure values) is then input into the force analysis model. The pressure array is converted into a force distribution map (such as a visualized heat map), and a pressure threshold range is set (e.g., 0-50 N / cm). 2The stress distribution is represented by a three-color gradient of red (high pressure) - yellow (medium pressure) - blue (low pressure). The pressure standard deviation in the thermogram is calculated. ) and range (maximum pressure - minimum pressure), when ≤5N / cm 2 And the range is ≤15N / cm 2 When the pressure is uniform, the cell is considered to have no gap-aperture risk due to uneven pressure distribution. If the pressure exceeds a threshold, the high-pressure area is marked as potentially high-risk, and the low-pressure area as potentially low-risk. Assume the pressure distribution on the upper surface of the lower pressure plate can be represented by a plane equation: P(x,y)=ax+by+c, where P(x,y) represents the pressure value at coordinate (x,y), a and b are the slope parameters of the plane, and c is a constant term. The tilt optimization value of the intermediate pressure plate and pre-pressure plate is output based on the thermal distribution. Pressure data points are fitted using the least squares method. The coefficients a, b, and c can be obtained:

[0224]

[0225]

[0226] Where n is the number of data points. These are the coordinates of the i-th data point. It is the pressure value of the i-th data point.

[0227] The tilt of the lower pressure plate can be described by two angular parameters. This represents the tilt angle (pitch angle) around the x-axis. These represent the tilt angle (roll angle) about the y-axis, and these two angles correspond to the slope parameters b and a in the plane equation, respectively. Tilting angle and It can be calculated using the following formula:

[0228]

[0229]

[0230] in, It is the tilt angle about the x-axis. is the tilt angle around the y-axis, and a and b are slope parameters obtained from plane fitting. These two angles represent the degree of tilt of the pressure plate relative to the ideal horizontal position. When or When the value is zero, the lower pressure plate is in a horizontal state.

[0231] To eliminate the tilt of the lower pressure plate, it is necessary to calculate and adjust the setting value to restore the lower pressure plate to a horizontal state. The adjustment setting value is the opposite of the current tilt angle.

[0232] Adjust angle and The calculation formula is:

[0233]

[0234]

[0235] in, It is around Adjustment angle of the shaft, It is the adjustment angle around the y-axis. The model ultimately outputs a risk alarm and the optimal adjustment angle result.

[0236] Step 9: Automatic equipment adjustment. Upon receiving the algorithm alarm and optimization results, the control software first converts the optimized values ​​into equipment setpoints. Based on process and equipment requirements, it checks the alarm and optimization results. If they meet the requirements, the control software sends the intermediate pressure plate pressing depth and the tilt angle configurations of the intermediate and pre-pressure plates to the equipment. After equipment adjustment is complete, it replies to the control software, which displays the latest pressing depth and tilt angle on the interface and simultaneously sends a copy to the algorithm service.

[0237] This embodiment performs a pressure test from the overall process perspective, thereby improving the comprehensiveness and reliability of the pressure test results.

[0238] In some embodiments, such as Figure 10 As shown, a downward pressure test method is proposed, including:

[0239] Step S10: Press down the reference component, wherein the reference component is used to simulate the pressure state of the wound bare cell during the pressing process;

[0240] Step S20: Acquire the sensing data of the reference component during the compression process through the sensor, and obtain the compression information of pressing down the reference component based on the sensing data;

[0241] In this embodiment, the pressure testing method can be applied to a pressure testing system. The pressure testing system includes: a pressure testing module, a reference component, a calculation module, and a sensor; the pressure testing module is used to apply pressure to the reference component, which simulates the pressure state of the wound bare cell during the pressure testing process; the sensor is used to acquire sensing data of the reference component during the pressure testing process and send the sensing data to the calculation module; the calculation module is used to obtain the pressure information of the pressure testing module based on the sensing data.

[0242] The pressing module can include an intermediate pressure plate, a pre-pressure plate, and a drive assembly. It responds to inspection commands and drives the pressure plate to press down on the reference component, making it the core execution component for the bare cell compaction process. The reference component can refer to an elastically stretchable Master, where "Master" indicates a reference component or master mold, and "elastically stretchable" indicates its ability to deform and expand elastically. This type of component can serve as a flexible reference or calibration tool to adapt to dynamic dimensional changes. For example, in practical applications, when the intermediate pressure plate presses down, the middle section of the Master can sink accordingly to accurately simulate the actual pressing production of the wound bare cell. Elastic deformation accommodates dimensional fluctuations, improving the system's adaptability and fault tolerance. The sensor can refer to a detection element installed at a preset detection position. This preset detection position can be pre-set or it can refer to a detection element installed on the elastically stretchable reference component, used to generate sensing data of the reference component during the pressing process. In specific implementations, the sensor includes, but is not limited to, pressure sensors and displacement sensors; this embodiment does not impose any limitations on this. The calculation module can refer to an analysis unit composed of hardware (data receiving interface) and software (algorithm service, control software). Its core function is to receive sensor data transmitted from the sensor, process the data through preset algorithms (such as least squares method, standard deviation / range calculation), and finally output the pressure information of the pressure module (such as force uniformity, whether the tilt needs to be adjusted, whether the pressure depth is compliant, etc.). The pressure information can refer to the core conclusions output by the calculation module after processing the sensor data, covering the evaluation results of key parameters in the pressure process, which may include pressure uniformity, pressure tilt, and pressure depth information, etc. This embodiment does not limit this.

[0243] For ease of understanding, please refer to Figure 1 , Figure 2 as well as Figure 3 This description is provided but does not limit the scope of the invention. Figure 1 This is a structural diagram of a pressure testing system according to some embodiments of the present invention. Figure 2 This is another structural diagram of the pressure testing system according to some embodiments of the present invention. Figure 3 This is a schematic diagram of a flexible and scalable reference component according to some embodiments of the present invention. As an example, when an operator issues an inspection command through a Human Machine Interface (HMI), the system enters the inspection process. In a specific implementation, it can be as follows: Figure 1 As shown, the pressure module 10 (such as...) Figure 1 The intermediate pressure plate (in the middle) responds to the inspection command and presses down on the reference piece 20 placed on the carrier platform 40. At this time, the reference piece 20, due to its elastic deformation capability, has its central area concave as the pressure plate is pressed down, accurately replicating the stress and deformation state of the loose bare cell being compacted in actual production, providing a simulation carrier that closely resembles the real working condition for subsequent testing. It can also be used as... Figure 2As shown, the pressure module 10 (such as...) Figure 2 In response to the inspection command, the preload plate is placed on the reference piece 20 on the vehicle platform 40.

[0244] like Figure 3 As shown, at least one sensor is mounted on the reference component 20. The sensor includes, but is not limited to, a pressure array 21 attached to the surface of the reference component 20 and a displacement gauge 22 mounted on a support column of the reference component 20. The pressure array 21 can be a flexible thin-film pressure array, which refers to a device consisting of multiple miniature pressure sensors integrated in an array on a flexible thin-film substrate. The thin-film material (such as polyimide) allows it to bend and conform to irregular surfaces. The array structure can simultaneously collect pressure values ​​at multiple points in a plane, forming a pressure distribution thermogram. The working principle of the flexible thin-film pressure array can be based on the piezoresistive effect (pressure changes the material resistance) or the capacitive effect (pressure changes the electrode spacing / dielectric constant), outputting multi-channel electrical signals. The displacement gauge 22 can be a lever-type potentiometer displacement gauge, which is a sensor that converts mechanical displacement into an electrical signal. Its core structure includes a lever (connected to the object being measured) and a potentiometer (resistive element): when the lever moves with the object, it moves the sliding contact of the potentiometer, changing the resistance value (or voltage division ratio). The displacement can be deduced by measuring the change in resistance.

[0245] like Figure 1 , Figure 2 as well as Figure 3 As shown, while the pressing module 10 is pressing down, the pressure array 21 and the displacement meter 22 start working simultaneously: the pressure array 21 collects the pressure values ​​at each point on the contact surface between the pressing module 10 and the reference component 20 in real time to form pressure data, while the displacement meter 22 collects displacement data through the displacement change of the support column. The two types of sensor data are transmitted to the calculation module 30 in real time at a preset frequency (such as 100ms / time). After receiving the data, the calculation module 30 first performs preprocessing such as noise reduction and normalization, and then analyzes it through a preset algorithm to obtain the pressing information of the pressing module 10.

[0246] This embodiment uses a reference component to simulate the pressure state of a wound bare cell during the pressure-down process, and uses sensors to acquire the sensing data of the reference component during the pressure-down process. Based on the sensing data, the pressure-down information of the pressure-down module is detected, thereby simplifying the pressure-down test operation and improving the efficiency and accuracy of the pressure-down test.

[0247] In some embodiments, such as Figure 11 As shown, the sensor includes a pressure array disposed on the surface of the reference member, the sensing data includes pressure data, the pressure information includes pressure uniformity and / or pressure tilt, and step S20 includes:

[0248] Step S201: Obtain pressure data of the reference component during the compression process through the pressure array;

[0249] Step S202: Calculate the pressure uniformity and / or pressure tilt of pressing down on the reference component based on the pressure data.

[0250] In order to accurately detect the pressure uniformity and pressure tilt during the pressing process, in this embodiment, the sensor includes a pressure array, which is disposed on the surface of the reference component. The pressure array acquires the pressure data of the reference component during the pressing process and sends the pressure data to the calculation module. The calculation module calculates the pressure uniformity and / or pressure tilt of the pressing module based on the pressure data.

[0251] The pressure array can be a flexible thin-film pressure array, which refers to a device consisting of multiple miniature pressure sensors integrated in an array on a flexible thin-film substrate. The thin-film material (such as polyimide) allows it to bend and conform to irregular surfaces. The array structure can simultaneously collect pressure values ​​at multiple points in a plane, forming a pressure distribution thermogram. The working principle of the flexible thin-film pressure array can be based on the piezoresistive effect (pressure changes the material resistance) or the capacitive effect (pressure changes the electrode spacing / dielectric constant), outputting multi-channel electrical signals. Pressure uniformity can be used to measure whether the pressure applied by the pressing module is evenly distributed on the surface of the reference piece. Pressing tilt can be used to measure whether the pressing module is in a horizontal position.

[0252] In the specific implementation, the calculation module calculates the pressure uniformity and / or downward tilt of the pressing module based on the pressure data through a force analysis model. The force analysis model can be a pre-set data analysis model, and this embodiment does not limit it.

[0253] In this embodiment, the sensor includes a pressure array, which is disposed on the surface of the reference component. The pressure array acquires the pressure data of the reference component during the pressing process and sends the pressure data to the calculation module. The calculation module calculates the pressure uniformity and / or pressing tilt of the pressing module based on the pressure data, thereby accurately detecting the pressure uniformity and pressing tilt during the pressing process.

[0254] In some embodiments, calculating the pressure uniformity of pressing down on the reference component based on the pressure data includes: generating pressure distribution information on the reference component based on the pressure data; and calculating the pressure uniformity of the pressing module based on the pressure distribution information.

[0255] To improve the accuracy of pressure uniformity detection, in this embodiment, pressure distribution information on the reference component is first generated based on the pressure data, and then the pressure uniformity of the pressing module is calculated based on the pressure distribution information.

[0256] Among them, pressure distribution information can refer to information generated based on pressure data that intuitively reflects the spatial distribution of pressure on the surface of the reference part. For example, pressure distribution information can be a two-dimensional array including coordinates and pressure. In the specific implementation, the calculation module first receives the two-dimensional data of "coordinate-pressure value" returned by the pressure array at a preset frequency (such as 100ms / time), and at the same time collects the status information of the workstation where the reference part is located (such as the type of the pressing module and the current pressing stage). The timing alignment algorithm ensures that the pressure data corresponds one-to-one with the workstation status, avoiding misalignment caused by data transmission delay (such as mismatching the pressure data of the pre-pressing plate to the intermediate pressing plate). The received raw pressure data is cleaned and standardized: (1) noise reduction to filter out abnormal values ​​caused by small fluctuations of the sensor (such as instantaneous jumps in ultra-high pressure / ultra-low pressure data); (2) normalization to unify the output signals of different micro sensors to the preset range and eliminate errors caused by individual differences of the sensors; (3) format conversion to organize the discrete "coordinate-pressure" data into a two-dimensional array (such as This facilitates subsequent analysis.

[0257] In this embodiment, pressure distribution information on the reference component is first generated based on pressure data, and then the pressure uniformity of the pressing module is calculated based on the pressure distribution information, thereby improving the accuracy of pressure uniformity detection.

[0258] In some embodiments, calculating the pressure uniformity of the pressing module based on the pressure distribution information includes: calculating pressure dispersion evaluation parameters at various locations on the reference component based on the pressure distribution information; and calculating the pressure uniformity of the pressing module based on the pressure dispersion evaluation parameters.

[0259] In order to quantify the pressure uniformity and improve its accuracy, in this embodiment, the pressure dispersion evaluation parameters at each position on the reference component are first calculated based on the pressure distribution information, and the pressure uniformity of the pressing module is calculated based on the pressure dispersion evaluation parameters.

[0260] Among them, the pressure dispersion evaluation parameter can refer to a multi-dimensional index used to quantify the dispersion of pressure distribution at various locations on the surface of a reference component. In specific implementations, the pressure dispersion evaluation parameter includes, but is not limited to, the pressure standard deviation ( Pressure range (R), coefficient of variation (CV), interquartile range (IQR), and mean absolute deviation (MAD). Pressure standard deviation ( The pressure range (R) reflects the degree of deviation of all pressure data from the mean. It is calculated by first calculating the sum of squares of the deviations of each pressure value from the mean, then taking the square root of the mean to quantify the overall dispersion of the pressure data. The coefficient of variation (CV) reflects the maximum range of pressure data fluctuations, calculated by subtracting the minimum value from the maximum value. The CV is a relative dispersion index, the ratio of the pressure standard deviation to the pressure mean, suitable for comparing dispersion at different average pressure levels, avoiding misjudgments of dispersion due to mean differences. The interquartile range (IQR) is a dispersion index resistant to outliers, the difference between the upper quartile (Q3, the value at the 75th percentile after data sorting) and the lower quartile (Q1, the value at the 25th percentile after data sorting) (IQR = Q3 - Q1), reducing the interference of extreme pressure values ​​on dispersion evaluation. The mean absolute deviation (MAD) reflects the average level of absolute deviation of pressure data from the mean, and is the arithmetic mean of the absolute differences between each pressure value and the mean.

[0261] In this embodiment, the pressure dispersion evaluation parameters at each position on the reference component are first calculated based on the pressure distribution information, and the pressure uniformity of the pressing module is calculated based on the pressure dispersion evaluation parameters, thereby enabling the quantification of pressure uniformity and improving the accuracy of pressure uniformity.

[0262] In some embodiments, the pressure dispersion evaluation parameters include pressure standard deviation and pressure range.

[0263] To further improve the accuracy of pressure uniformity detection, in this embodiment, the pressure dispersion evaluation parameters include pressure standard deviation and pressure range. The pressure uniformity of the pressure module is calculated by combining the pressure standard deviation and pressure range.

[0264] Among them, the standard deviation of pressure ( The standard deviation (SD) can refer to a statistical measure describing the dispersion of pressure values ​​from the average value in the pressure data. In this embodiment, the smaller the standard deviation, the more concentrated the pressure distribution, reflecting a more uniform pressure exerted by the pressure plate of the pressure module on the reference component. The pressure range can refer to the difference between the maximum and minimum pressure values ​​in the pressure data, and is an indicator that directly reflects the range of pressure distribution fluctuations. The smaller the range, the smaller the extreme differences in the pressure distribution, allowing for a quick preliminary assessment of pressure uniformity.

[0265] In the specific implementation, the calculation module organizes the discrete "coordinate-pressure" data into a two-dimensional array (such as...). After that, calculate two key statistics: the standard deviation of pressure ( First, calculate the average of all pressure values. Then calculate the sum of squares of the deviations of each pressure value from the average value, divide by the number of data points n, and take the square root to obtain... This reflects the dispersion of pressure distribution. Pressure range: filters out the maximum pressure value in the data. and minimum pressure value Calculate the difference between the two ( This reflects the range of pressure distribution fluctuations. The calculated values... and range and preset threshold ( ≤5N / cm 2 And the range is ≤15N / cm 2 Comparison: If all thresholds are met simultaneously, the pressure is considered uniform, and the bare cells have no risk of GAP (Gas Apparent Apparent Surface Damage) due to uneven stress; if any indicator exceeds the threshold, a high-voltage zone is marked. Much larger ) and low-pressure areas ( much smaller The area marked as high risk indicates uneven pressure.

[0266] In this embodiment, the force dispersion evaluation parameters include pressure standard deviation and pressure range. The pressure uniformity of the pressure module is calculated by combining the pressure standard deviation and pressure range, thereby further improving the accuracy of pressure uniformity detection.

[0267] In some embodiments, the pressure distribution information includes a force distribution diagram of the reference component, and generating pressure distribution information on the reference component based on the pressure data includes: determining the position coordinates of each position on the reference component, and obtaining the pressure value corresponding to the position coordinates based on the pressure data; generating a force distribution diagram of the reference component based on the position coordinates and the pressure value.

[0268] To provide a visual reference for judging pressure uniformity, in this embodiment, the pressure distribution information includes a force distribution diagram of the reference component. First, the position coordinates of each position on the reference component are determined, and the pressure value corresponding to the position coordinate is obtained according to the pressure data. Then, a force distribution diagram is generated based on the position coordinate and the pressure value.

[0269] The force distribution diagram refers to a graphical representation of the pressure distribution generated by the calculation module after visualizing the pressure data. This is achieved by setting a pressure threshold range (e.g., 0-50 N / cm²). 2 The system uses a three-color gradient of red (high pressure zone), yellow (medium pressure zone), and blue (low pressure zone) to present the magnitude of the force at different locations on the surface of the reference component. This can intuitively reflect the pressure distribution differences of the pressure plate (intermediate pressure plate, pre-pressure plate) acting on the reference component, providing operators with a visual reference for quickly judging the pressure uniformity.

[0270] In the specific implementation, the calculation module organizes the discrete "coordinate-pressure" data into a two-dimensional array (such as...). After that, based on the processed data, the correspondence between pressure values ​​and colors is set (e.g., 0-15 N / cm).2 It is blue and has a strength of 15-35 N / cm. 2 Yellow, 35-50 N / cm 2 (in red), according to coordinates Each pressure value The corresponding colors are filled into the graphical interface to form a force distribution map covering the entire pressure surface of the reference part, visually presenting the pressure distribution differences. After generating the force distribution map, the calculation module automatically extracts the values ​​of all pressure data points in the map and performs subsequent steps to calculate the pressure uniformity.

[0271] In this embodiment, the pressure distribution information includes the force distribution diagram of the reference component. First, the position coordinates of each position on the reference component are determined, and the pressure value corresponding to the position coordinate is obtained according to the pressure data. Then, the force distribution diagram is generated based on the position coordinate and the pressure value, which can provide a visual reference for judging the pressure uniformity.

[0272] In some embodiments, calculating the downward tilt of the reference component based on the pressure data includes: inputting the pressure data into a preset tilt model; and calculating the downward tilt of the pressing module based on the preset tilt model.

[0273] To improve the accuracy of the downward tilt detection, in this embodiment, the pressure data is input into a preset tilt model, and the downward tilt of the pressing module is calculated based on the preset tilt model.

[0274] The preset tilt model can refer to a mathematical model used to calculate the tilt angle of the pressing module. This preset tilt model can be set in advance, and this implementation does not impose any restrictions on it. The pressing tilt angle can refer to a quantitative indicator measuring the deviation of the pressing module from a horizontal state, comprising two dimensions: one is the tilt angle around the x-axis (…). (Pitch angle, reflecting the degree of tilt of the module along the x-axis), and secondly, the tilt angle around the y-axis. (Roll angle, reflecting the degree of tilt of the module along the y-axis); when , When the value is 0, the pressure module is in a horizontal state with uniform pressure distribution; otherwise, it is tilted and needs to be corrected by adjusting the angle.

[0275] In this embodiment, pressure data is input into a preset tilt model, and the downward tilt of the pressing module is calculated based on the preset tilt model, thereby improving the accuracy of downward tilt detection.

[0276] In some embodiments, the preset tilt model is a plane equation representing the pressure distribution on the reference component. The step of inputting the pressure data into the preset tilt model and calculating the downward tilt of the pressing module based on the preset tilt model includes: determining the position coordinates and pressure values ​​of each position on the reference component according to the pressure data; inputting the position coordinates and pressure values ​​into the plane equation, solving for the slope parameter in the plane equation, and calculating the downward tilt of the pressing module based on the slope parameter.

[0277] The tilt model can be a mathematical model constructed based on pressure data to describe the tilt state of the pressure plate of the pressure module. The core assumption is that the pressure distribution on the surface of the reference part conforms to the plane equation P(x,y)=ax+by+c (P(x,y) is the pressure value at coordinate (x,y), a and b are plane slope parameters, and c is a constant term). The parameters a, b, and c are obtained by fitting the pressure data points using the least squares method, and then the tilt degree of the pressure plate is quantified.

[0278] In the specific implementation, it is assumed that the pressure distribution on the upper surface of the lower pressure plate can be represented by a plane equation: P(x,y)=ax+by+c, where: P(x,y) represents the pressure value at coordinates (x,y), a and b are the slope parameters of the plane, and c is a constant term. The tilt adjustment value of the intermediate pressure plate and the pre-pressure plate is output based on the thermal distribution. The pressure data points are fitted using the least squares method. The coefficients a, b, and c can be obtained:

[0279]

[0280]

[0281] Where n is the number of data points. These are the coordinates of the i-th data point. It is the pressure value of the i-th data point.

[0282] The tilt of the lower pressure plate can be described by two angular parameters. This represents the tilt angle (pitch angle) around the x-axis. These represent the tilt angle (roll angle) about the y-axis, and these two angles correspond to the slope parameters b and a in the plane equation, respectively. Tilting angle and It can be calculated using the following formula:

[0283]

[0284]

[0285] in, It is the tilt angle about the x-axis. is the tilt angle around the y-axis, and a and b are slope parameters obtained from plane fitting. These two angles represent the degree of tilt of the pressure plate relative to the ideal horizontal position. When or When the value is zero, the lower pressure plate is in a horizontal state.

[0286] In this embodiment, the position coordinates of each position on the reference component are first determined, and the pressure value corresponding to the position coordinate is obtained according to the pressure data. The position coordinates and pressure value are then input into the plane equation to solve the slope parameter in the plane equation. Based on the slope parameter, the downward tilt of the pressing module is calculated, thereby further improving the accuracy of the downward tilt detection.

[0287] In some embodiments, after calculating the downward tilt of pressing down on the reference member based on the pressure data, the method further includes: calculating a tilt adjustment value based on the downward tilt; and adjusting the tilt angle of pressing down on the reference member based on the tilt adjustment value.

[0288] To ensure uniform pressure on the bare cells and avoid problems such as excessive local pressure (puncturing the diaphragm) or insufficient local pressure (failing to compact and causing GAP) due to tilting, this embodiment calculates the tilt adjustment value based on the downward tilt and adjusts the tilt angle of the downward module according to the tilt adjustment value.

[0289] The control module, in this context, refers to the execution control unit within the pressure testing system. Its core function is to receive the tilt adjustment value sent by the calculation module, convert it into control commands executable by the equipment, and drive the pressure module to complete the tilt angle correction. The tilt adjustment value is the target angle value used to correct the tilt of the pressure plate, calculated by the calculation module based on the pressure tilt. Essentially, it is the opposite of the current tilt angle. By driving the pressure plate to adjust this angle through the control module, the pressure plate can be restored to a horizontal state.

[0290] For ease of understanding, please refer to Figure 4 This description is provided but does not limit the scope of the invention. Figure 4 This is another structural diagram of the pressure testing system according to some embodiments of the present invention. As an example, it is assumed that the pressure module 10 is an intermediate pressure plate, and the calculation module 30 receives the pressure data (two-dimensional array) transmitted by the pressure array. , coordinates First, the data undergoes denoising and normalization preprocessing. Then, a slope model P(x,y)=ax+by+c is fitted using the least squares method to solve for the slope parameters a and b. Subsequently, based on the pressure value, the slope parameters a and b are calculated. , Calculate the downward tilt angle. If the angle exceeds a preset threshold (e.g., absolute value > 1°), then press... , Calculate the tilt adjustment value to determine the direction and angle that the pressure plate needs to be corrected. Calculation module 30 will then calculate the tilt adjustment value (…). , The adjustment value is sent to the control module 50 via a data interface (such as Ethernet or serial port). After receiving the adjustment value, the control software of the control module 50 first verifies its validity to determine whether the adjustment value meets the equipment process requirements (such as whether the adjustment angle range is within the maximum stroke of the servo motor or exceeds the mechanical limit of the pressure plate). After the verification is passed, the angle value is converted into a control signal that the equipment can recognize (such as pulse count or voltage signal). For example, if the angle is adjusted around the x-axis... =1.72°, the number of pulses required for the servo motor to rotate is calculated from parameters such as the motor reduction ratio and the lead screw. The control module 50 sends the converted control signal to the drive component of the pressing module 10 (such as a servo motor that controls the tilt of the pressure plate); the servo motor drives the ball screw or gear mechanism according to the instruction, causing the pressure plate to rotate around the x-axis and y-axis by the corresponding angle (such as by...). =1.72° =4.85° adjustment); During the adjustment process, the pressure array collects pressure data in real time and feeds it back to the calculation module 30. The calculation module 30 recalculates the downward tilt angle. If the angle returns to the threshold (absolute value ≤ 1°), the control module 50 stops the adjustment and completes the correction; if it does not meet the standard, the "adjustment-feedback-calculation" process is repeated until the pressure plate is horizontal.

[0291] In this embodiment, the tilt adjustment value is calculated based on the downward tilt angle, and the tilt angle of the downward module is adjusted according to the tilt adjustment value. This ensures that the bare cell is subjected to uniform pressure and avoids problems such as excessive or insufficient local pressure caused by tilting.

[0292] In some embodiments, such as Figure 12 As shown, the sensor includes a displacement gauge, which is mounted on the support column of the reference member. The sensing data includes displacement data, and the compression information includes compression depth information. Step S20 includes:

[0293] Step S201': Obtain the displacement data of the reference component during the compression process using the displacement gauge;

[0294] Step S202': Calculate the pressing depth information of the reference component based on the displacement data.

[0295] In order to accurately detect the compression depth information during the compression process, in this embodiment, the sensor includes a displacement gauge, which is set on the support column of the reference component. The displacement gauge generates displacement data of the reference component during the compression process, and the compression depth information of the compression module is calculated based on the displacement data.

[0296] Specifically, a flexible, retractable potentiometer-type displacement gauge attached to the Master surface is used to accurately detect the pressing depth of the intermediate pressure plate, and the data is input into the model to calculate the average displacement. Displacement deviation , The logic used to determine whether the displacement consistency is good and whether the pressing depth is appropriate is as follows: Wherein, the specification height = fluffiness of the battery cell thickness + thickness of the clamping pin + (x mm), It is used to determine whether there is a risk of gaps and outputs the pressure depth adjustment value.

[0297] In this embodiment, the sensor includes a displacement gauge, which is mounted on the support column of the reference component. The displacement gauge generates displacement data of the reference component during the compression process, and calculates the compression depth information based on the displacement data, thereby enabling accurate detection of the compression depth information during the compression process.

[0298] In some embodiments, the compression depth information includes: an average compression depth and a compression depth deviation value; the step of calculating the compression depth information of pressing the reference member based on the displacement data includes: calculating the average compression depth of pressing the reference member based on the displacement data; and calculating the compression depth deviation value of pressing the reference member based on the average compression depth.

[0299] To further improve the accuracy of the compression depth information, in this embodiment, the compression depth information includes the average compression depth and the compression depth deviation value, which are calculated based on the displacement data.

[0300] Among them, the average depth of compression ( This could refer to the arithmetic mean obtained by the calculation module from the statistical analysis of the displacement data of the four support columns. The calculation formula is as follows: This represents the average vertical displacement of the reference component after it is subjected to overall compression, indirectly reflecting the actual compression depth of the compression module. It is a core parameter for subsequent calculation of deviation values ​​and determination of GAP risk. Compression depth deviation value ( This can refer to the absolute difference between the displacement of a single support column and the average downward pressure depth, calculated using the following formula: This is used to determine the consistency of displacement data (i.e., whether the displacement of the four support columns is uniform), with a preset threshold of [value missing]. ≤0.5cm; if it exceeds this value, it indicates uneven pressure on the reference component, and the data cannot be used for subsequent GAP risk assessment.

[0301] In this embodiment, the compression depth information includes the average compression depth and the compression depth deviation value. The average compression depth and the compression depth deviation value are calculated based on the displacement data, thereby further improving the accuracy of the compression depth information.

[0302] In some embodiments, after calculating the average pressing depth of the reference component based on the displacement data, the method further includes: obtaining the initial height of the reference component and the specification height of the wound bare cell, and calculating a height deviation value based on the initial height, the specification height, and the average pressing depth; determining a pressing depth adjustment value based on the height deviation value, and adjusting the pressing depth of the reference component based on the pressing depth adjustment value.

[0303] To reduce the risk of excessive pressure (too small GAP, electrode burrs piercing the separator and causing micro-short circuits) or excessive pressure (too large GAP, insufficient electrolyte wetting and causing lithium plating), in this embodiment, the height deviation value is calculated based on the initial height of the reference component, the specification height of the wound bare cell, and the average pressure depth, and the pressure depth adjustment value is determined based on the height deviation value to adjust the pressure depth.

[0304] The initial height of the reference component can refer to the original height of the elastic and retractable reference component (elastic and retractable Master) when it is not under pressure. The specification height of the wound bare cell can refer to the process target height of the bare cell pressing process, calculated as specification height = fluffiness of the cell + thickness of the clamping pin + x, where x is a preset process compensation value in mm. Height deviation value ( This can refer to the absolute difference between the actual equivalent depth of compression and the specified height, calculated using the following formula: Used to quantify the deviation between the pressing depth and the process standard, such as ≤1mm (risk-free), 2mm> >1mm (mild risk), 3mm> >2mm (moderate risk) >3mm (height risk). The compression depth adjustment value can refer to the target adjustment amount derived by the calculation module based on the height deviation value, which aims to bring the compression depth back to the specified height. The calculation logic is: Adjustment value = (Initial height of reference part - ... - Specification height (if positive, the pressing depth needs to be reduced; if negative, the pressing depth needs to be increased) is essentially a compensation amount to eliminate height deviation, providing the control module with a clear direction and value for parameter adjustment.

[0305] This embodiment calculates the height deviation value based on the initial height of the reference component, the specification height of the wound bare cell, and the average value of the pressing depth. The pressing depth is then adjusted based on the height deviation value to avoid pressing too deep or too shallow, thereby reducing the risk of winding GAP.

[0306] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A pressure testing system, characterized in that, The pressure testing system includes a pressure module, a reference component, a calculation module, and a sensor. The reference component is an elastic and stretchable structure. The central area of ​​the reference component can sink with the pressure of the pressure module to simulate the stress and deformation state of a loose bare cell being compacted. The pressing module is used to apply pressure to the reference component, which is used to simulate the pressure state of the wound bare cell during the pressing process. The sensor is used to acquire sensing data of the reference component during the compression process and send the sensing data to the computing module. The sensor includes a pressure array and a displacement gauge. The pressure array is disposed on the surface of the reference component, and the displacement gauge is disposed on a support column inside the reference component. The calculation module is used to obtain the pressure information of the pressure-down module based on the sensing data; The sensing data includes pressure data, and the pressure information includes pressure uniformity and / or pressure tilt. And / or, the sensing data includes displacement data, and the pressure information includes pressure depth information.

2. The pressure testing system as described in claim 1, characterized in that, The sensor includes a pressure array disposed on the surface of the reference member; the sensing data includes pressure data; and the pressure information includes pressure uniformity and / or pressure tilt. The pressure array is used to acquire pressure data of the reference component during the pressure process and send the pressure data to the calculation module; The calculation module is also used to calculate the pressure uniformity and / or pressure tilt of the pressing module based on the pressure data.

3. The pressure testing system as described in claim 2, characterized in that, The calculation module is also used to generate pressure distribution information on the reference component based on the pressure data, and to calculate the pressure uniformity of the pressing module based on the pressure distribution information.

4. The pressure testing system as described in claim 3, characterized in that, The calculation module is also used to calculate the pressure dispersion evaluation parameters at each position on the reference component based on the pressure distribution information, and to calculate the pressure uniformity of the pressing module based on the pressure dispersion evaluation parameters.

5. The pressure testing system as described in claim 4, characterized in that, The pressure dispersion evaluation parameters include pressure standard deviation and pressure range.

6. The pressure testing system as described in claim 3, characterized in that, The pressure distribution information includes the force distribution diagram of the reference component. The calculation module is also used to determine the position coordinates of each position on the reference component, obtain the pressure value corresponding to the position coordinates according to the pressure data, and generate the force distribution diagram according to the position coordinates and the pressure value.

7. The pressure testing system as described in claim 2, characterized in that, The calculation module is also used to input the pressure data into a preset tilt model and calculate the downward tilt of the downward module based on the preset tilt model.

8. The pressure testing system as described in claim 7, characterized in that, The preset tilt model is a plane equation used to represent the pressure distribution on the reference component. The calculation module is also used to determine the position coordinates of each position on the reference component, obtain the pressure value corresponding to the position coordinates according to the pressure data, input the position coordinates and the pressure value into the plane equation, solve the slope parameter in the plane equation, and calculate the downward tilt of the pressing module based on the slope parameter.

9. The pressure testing system as described in any one of claims 2 to 8, characterized in that, The pressure testing system also includes: a control module; The calculation module is also used to calculate a tilt adjustment value based on the downward tilt angle, and send the tilt adjustment value to the control module; The control module is also used to adjust the tilt angle of the pressing module according to the tilt adjustment value.

10. The pressure testing system as described in any one of claims 2 to 8, characterized in that, The pressure testing system also includes: an alarm module; The calculation module is also used to determine the tilt alarm level corresponding to the downward tilt angle, and send the tilt alarm level to the alarm module, wherein the larger the downward tilt angle, the higher the tilt alarm level; The alarm module is also used to generate tilt alarm information based on the tilt alarm level, and to issue an alarm based on the tilt alarm information.

11. The pressure testing system as described in any one of claims 1 to 8, characterized in that, The sensor includes a displacement gauge, which is mounted on the support column of the reference member. The sensing data includes displacement data, and the compression information includes compression depth information. The displacement gauge is used to acquire displacement data of the reference component during the compression process and send the displacement data to the calculation module; The calculation module is used to calculate the compression depth information of the compression module based on the displacement data.

12. The pressure testing system as described in claim 11, characterized in that, The compression depth information includes: average compression depth and compression depth deviation; The calculation module is also used to calculate the average pressing depth of the pressing module based on the displacement data; The calculation module is also used to calculate the pressure depth deviation value of the pressure module based on the average pressure depth.

13. The pressure testing system as described in claim 12, characterized in that, The pressure testing system also includes: a control module; The calculation module is used to obtain the initial height of the reference component and the specified height of the wound bare cell, and to calculate the height deviation value based on the initial height, the specified height and the average pressing depth. The calculation module is used to determine the pressing depth adjustment value based on the height deviation value, and send the pressing depth adjustment value to the control module; The control module is used to adjust the pressing depth of the pressing module according to the pressing depth adjustment value.

14. The pressure testing system as described in claim 13, characterized in that, The pressure testing system also includes: an alarm module; The calculation module is also used to determine the pressure depth alarm level corresponding to the height deviation value, and send the pressure depth alarm level to the alarm module, wherein the larger the height deviation value, the higher the pressure depth alarm level; The alarm module is used to generate pressure depth alarm information according to the pressure depth alarm level, and to issue an alarm based on the pressure depth alarm information.

15. The pressure testing system as described in any one of claims 1 to 8, characterized in that, The pressing module includes a first pressure plate and / or a second pressure plate. The first pressure plate is used to press down on a preset middle area of ​​the reference piece, and the second pressure plate is used to press down on a preset overall area of ​​the reference piece after the reference piece has been pressed down by the first pressure plate and the feeding clamp needle has been pulled out.

16. The pressure testing system as described in claim 15, characterized in that, The pressure testing system also includes: a pin clamping control module and a carrier platform; wherein... The clamping needle control module is used to place the feeding clamping needle into the reference part and control the feeding clamping needle to open. The carrier platform is used to drive the reference component to move relative to the pressing module; The needle clamping control module is also used to extract the feeding needle from the reference component after the first pressure plate has been pressed down.

17. A method for conducting a downward pressure test, characterized in that, include: A pressure reference component, wherein the reference component is used to simulate the pressure state of the wound bare cell during the pressure process, the reference component is an elastic and stretchable structure, and the central area of ​​the reference component can sink with the pressure of the pressure module to simulate the stress and deformation state of the loose bare cell being compacted. The sensor acquires the sensing data of the reference component during the compression process, and obtains the compression information of pressing down on the reference component based on the sensing data. The sensor includes a pressure array and a displacement gauge. The pressure array is disposed on the surface of the reference component, and the displacement gauge is disposed on the support column inside the reference component. The sensing data includes pressure data, and the pressure information includes pressure uniformity and / or pressure tilt. And / or, the sensing data includes displacement data, and the pressure information includes pressure depth information.

18. The pressure test method as described in claim 17, characterized in that, The sensor includes a pressure array disposed on the surface of the reference member, the sensing data includes pressure data, and the pressure information includes pressure uniformity and / or pressure tilt. The step of acquiring sensing data of the reference component during the compression process through a sensor, and obtaining the compression information of pressing down on the reference component based on the sensing data, includes: The pressure data of the reference component during the pressure process is obtained through the pressure array; Calculate the pressure uniformity and / or pressure tilt of the reference component based on the pressure data.

19. The pressure testing method as described in claim 18, characterized in that, The step of calculating the pressure uniformity of pressing down on the reference component based on the pressure data includes: Based on the pressure data, pressure distribution information on the reference component is generated; The pressure uniformity of pressing down on the reference component is calculated based on the pressure distribution information.

20. The pressure testing method as described in claim 19, characterized in that, The step of calculating the pressure uniformity of pressing down on the reference component based on the pressure distribution information includes: Calculate the pressure dispersion evaluation parameters at each location on the reference component based on the pressure distribution information; The pressure uniformity of the reference component under pressure is calculated based on the pressure dispersion evaluation parameters.

21. The pressure test method as described in claim 20, characterized in that, The pressure dispersion evaluation parameters include pressure standard deviation and pressure range.

22. The pressure test method as described in claim 19, characterized in that, The pressure distribution information includes a force distribution diagram of the reference component, and the step of generating pressure distribution information on the reference component based on the pressure data includes: Determine the position coordinates of each position on the reference component, and obtain the pressure value corresponding to the position coordinates based on the pressure data; A force distribution diagram of the reference component is generated based on the position coordinates and the pressure value.

23. The pressure testing method as described in claim 18, characterized in that, The step of calculating the downward tilt angle of pressing down on the reference component based on the pressure data includes: Input the pressure data into a preset tilt model; The downward tilt angle of the reference component is calculated based on the preset tilt angle model.

24. The pressure test method as described in claim 23, characterized in that, The preset tilt model is a plane equation used to represent the pressure distribution on the reference component. The step of inputting the pressure data into the preset tilt model and calculating the downward tilt angle of the pressure applied to the reference component based on the preset tilt model includes: The position coordinates and pressure values ​​of each location on the reference component are determined based on the pressure data. Input the position coordinates and the pressure value into the plane equation, solve for the slope parameter in the plane equation, and calculate the downward tilt of the downward module based on the slope parameter.

25. The pressure test method according to any one of claims 18 to 24, characterized in that, After calculating the downward tilt angle of the reference component based on the pressure data, the method further includes: Calculate the tilt adjustment value based on the downward tilt angle; Adjust the tilt angle of the reference component according to the tilt adjustment value.

26. The pressure test method according to any one of claims 17 to 24, characterized in that, The sensor includes a displacement gauge, which is mounted on the support column of the reference member. The sensing data includes displacement data, and the compression information includes compression depth information. The process of acquiring sensing data of the reference member during the compression process through the sensor, and obtaining compression information of the reference member based on the sensing data, includes: The displacement data of the reference component during the compression process are obtained through the displacement gauge; The pressing depth information of the reference component is calculated based on the displacement data.

27. The pressure test method as described in claim 26, characterized in that, The compression depth information includes: average compression depth and compression depth deviation; the calculation of the compression depth information for pressing the reference component based on the displacement data includes: Calculate the average pressing depth of the reference component based on the displacement data; The deviation value of the pressing depth of the reference component is calculated based on the average pressing depth.

28. The pressure test method as described in claim 27, characterized in that, After calculating the average pressing depth of the reference member based on the displacement data, the method further includes: Obtain the initial height of the reference component and the specified height of the wound bare cell, and calculate the height deviation value based on the initial height, the specified height, and the average pressing depth. The pressing depth adjustment value is determined based on the height deviation value, and the pressing depth of the reference part is adjusted based on the pressing depth adjustment value.

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