CN-121067981-B - Push-down test system and method

CN121067981BCN 121067981 BCN121067981 BCN 121067981BCN-121067981-B

Abstract

The invention relates to the technical field of batteries and discloses a downward-pressing testing system and method, wherein the system comprises a downward-pressing module, a reference piece, a calculation module and a sensor; the invention relates to a device for testing a bare cell, which comprises a pressing module, a sensor, a calculation module and a sensor, wherein the pressing module is used for applying pressure to a reference piece, the reference piece is used for simulating the pressed state of the bare cell in the pressing process, the sensor is used for acquiring sensing data of the reference piece in the pressing process and sending the sensing data to the calculation module, the calculation module is used for obtaining the pressing information of the pressing module according to the sensing data, the pressing state of the bare cell in the pressing process is simulated by setting the reference piece, the sensing data of the reference piece in the pressing process is acquired by the sensor, and the pressing information is detected according to the sensing data, so that the pressing test operation can be simplified, and the pressing test efficiency and accuracy can be improved.

Inventors

HU DIANGANG
ZHENG XIAOYU
WU YIDONG
Qin Anxiang
ZHANG XUAN
CHEN YANXIAO

Assignees

宁德时代新能源科技股份有限公司
宁德时代润智软件科技有限公司

Dates

Publication Date: 20260512
Application Date: 20251106

Claims (20)

1. The pressing test system is characterized by comprising a pressing module, a reference piece, a calculation module and a sensor, wherein the reference piece is of an elastic telescopic structure, and the central area of the reference piece can sink along with the pressure of the pressing module so as to simulate the pressed stress and deformation state of a fluffy bare cell; The pressing module is used for applying pressure to the reference piece, and the reference piece is used for simulating the pressed state of the wound bare cell in the pressing process; The sensor is used for acquiring sensing data of the reference piece in the compression process and sending the sensing data to the calculation module, wherein the sensor comprises a pressure array and a displacement meter, the pressure array is arranged on the surface of the reference piece, and the displacement meter is arranged on a support column in the reference piece; the calculation module is used for obtaining the pressing information of the pressing module according to the sensing data; The sensing data comprise pressure data, and the pressing information comprises pressure uniformity and/or pressing inclination; and/or, the sensing data comprises displacement data, and the pressing information comprises pressing depth information.
2. The hold-down test system of claim 1, wherein the sensor comprises a pressure array disposed on the surface of the fiducial, the sensed data comprising pressure data, the hold-down information comprising pressure uniformity and/or hold-down slope, wherein, The pressure array is used for acquiring pressure data of the reference piece in the process of being pressed and sending the pressure data to the calculation module; The calculation module is further used for calculating pressure uniformity and/or pressing gradient of the pressing module according to the pressure data.
3. The system of claim 2, wherein the computing module is further configured to generate pressure distribution information on the reference member based on the pressure data, and to calculate a pressure uniformity of the pressing module based on the pressure distribution information.
4. The system of claim 3, wherein the computing module is further configured to calculate a pressure dispersion evaluation parameter for each location on the reference member based on the pressure distribution information, and calculate a pressure uniformity of the pressing module based on the pressure dispersion evaluation parameter.
5. The hold-down test system of claim 4, wherein the pressure dispersion evaluation parameter comprises a standard deviation of pressure and a range of pressure.
6. The system of claim 3, wherein the pressure distribution information includes a force distribution map of the reference member, and the computing module is further configured to determine position coordinates of each position on the reference member, obtain a pressure value corresponding to the position coordinates according to the pressure data, and generate the force distribution map according to the position coordinates and the pressure value.
7. The hold-down test system of claim 2, wherein the calculation module is further configured to input the pressure data into a preset slope model and calculate a hold-down slope of the hold-down module based on the preset slope model.
8. The system of claim 7, wherein the pre-set inclination model is a plane equation for representing a pressure distribution on the reference member, and the calculating module is further configured to determine position coordinates of each position on the reference member, obtain a 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 a slope parameter in the plane equation, and calculate the inclination of the pressing module based on the slope parameter.
9. The push-down test system according to any one of claims 2-8, further comprising a control module; The calculation module is further used for calculating an inclination adjustment value according to the downward pressing inclination and sending the inclination adjustment value to the control module; The control module is also used for adjusting the inclination angle of the pressing module according to the inclination adjustment value.
10. The push-down test system according to any one of claims 2 to 8, further comprising an alarm module; the calculation module is further configured to determine an inclination alarm level corresponding to the pressing inclination, and send the inclination alarm level to the alarm module, where the greater the pressing inclination is, the higher the inclination alarm level is; And the alarm module is also used for generating inclination alarm information according to the inclination alarm level and alarming according to the inclination alarm information.
11. The hold-down test system of any one of claim 1 to 8, wherein the sensor comprises a displacement meter disposed on a support post of the fiducial, the sensed data comprises displacement data, the hold-down information comprises hold-down depth information, wherein, The displacement meter is used for acquiring displacement data of the reference piece in the compression process and sending the displacement data to the calculation module; and the calculation module is used for calculating the pressing depth information of the pressing module according to the displacement data.
12. The system of claim 11, wherein the depth of depression information comprises an average value of depth of depression and a deviation value of depth of depression; the calculation module is also used for calculating the average value of the pressing depth of the pressing module according to the displacement data; The calculation module is further configured to calculate a pressing depth deviation value of the pressing module according to the pressing depth average value.
13. The system of claim 12, wherein the system further comprises a control module; the calculating module is used for obtaining the initial height of the reference piece, obtaining the specification height of the coiled bare cell and calculating a height deviation value according to the initial height, the specification height and the average value of the pressing depth; The calculation module is used for determining a pressing depth adjustment value according to the height deviation value and sending the pressing depth adjustment value to the control module; the control module is used for adjusting the pressing depth of the pressing module according to the pressing depth adjusting value.
14. The system of claim 13, wherein the system further comprises an alarm module; The calculation module is further configured to determine a pressing depth alarm level corresponding to the height deviation value, and send the pressing depth alarm level to the alarm module, where the greater the height deviation value is, the higher the pressing depth alarm level is; and the alarm module is used for generating the pressing depth alarm information according to the pressing depth alarm level and alarming based on the pressing depth alarm information.
15. The hold-down test system of any one of claims 1 to 8, wherein the hold-down module comprises a first platen for holding down a preset intermediate region of the reference member and/or a second platen for holding down a preset integral region of the reference member after the reference member is held down past the first platen and a blanking clip is withdrawn.
16. The hold-down test system of claim 15, further comprising a needle clamping control module and a carrier platform, wherein, The clamping needle control module is used for placing a blanking clamping needle into the reference piece and controlling the blanking clamping needle to open; The carrier platform is used for driving the reference piece to move relative to the lower pressure module; The clamping needle control module is further used for extracting the blanking clamping needle from the reference piece after the first pressing plate is pressed down.
17. A method of testing for depression, comprising: The reference piece is used for simulating the compression state of the coiled bare cell in the compression process, the reference piece is of an elastic telescopic structure, and the central area of the reference piece can sink along with the pressure of the compression module so as to simulate the compression and deformation states of the fluffy bare cell; The method comprises the steps that sensing data of a reference piece in a pressing process are obtained through a sensor, and pressing information for pressing the reference piece is obtained according to the sensing data, wherein the sensor comprises a pressure array and a displacement meter, the pressure array is arranged on the surface of the reference piece, and the displacement meter is arranged on a support column in the reference piece; The sensing data comprise pressure data, and the pressing information comprises pressure uniformity and/or pressing inclination; and/or, the sensing data comprises displacement data, and the pressing information comprises pressing depth information.
18. The method of claim 17, wherein the sensor comprises a pressure array disposed on the surface of the reference member, the sensed data comprises pressure data, and the hold-down information comprises pressure uniformity and/or hold-down inclination; the sensor is used for acquiring sensing data of the reference piece in the compression process, and obtaining the compression information for compressing the reference piece according to the sensing data, and the method comprises the following steps: Acquiring pressure data of the reference piece in the compression process through the pressure array; And calculating the pressure uniformity and/or the pressing gradient of the pressing reference piece according to the pressure data.
19. The method of claim 18, wherein said calculating a uniformity of pressure for pressing down said reference member based on said pressure data comprises: Generating pressure distribution information on the reference piece according to the pressure data; and calculating the uniformity of the pressure for pressing down the reference piece according to the pressure distribution information.
20. The method of claim 19, wherein calculating a uniformity of pressure for pressing down the reference member based on the pressure distribution information, comprises: calculating pressure dispersion evaluation parameters of each position on the reference piece according to the pressure distribution information; And calculating the uniformity of the pressure for pressing down the reference piece according to the pressure dispersion evaluation parameter.

Description

Push-down test system and method Technical Field The invention relates to the technical field of batteries, in particular to a system and a method for testing downward pressure. Background In the lithium battery manufacturing, a positive electrode sheet, a negative electrode sheet, and a separator (insulating layer) are stacked in this order, and then rolled into a "bare cell" by a winder. In the winding process, the problem of the inner ring GAP of the bare cell is easy to form due to the influence of the pressing process of the bare cell, wherein the winding GAP is a GAP or a distance between two adjacent layers of winding materials in the winding process (such as battery cell winding, film/metal belt winding and the like). The GAP is a key parameter affecting the winding quality, wherein too small GAP can cause extrusion deformation and wrinkling of materials, and too large GAP can cause loose winding and dislocation between layers, so that the structural stability of a product (such as the energy density and the mechanical strength of a battery cell) is affected. Therefore, in order to solve the problem of the bare cell inner ring GAP, a push-down test is generally required. However, the related pressing test mode is manual spot detection, and has the defects of complex operation, low detection efficiency and certain error. Disclosure of Invention In view of the above problems, the present invention provides a system and a method for testing downward pressure, which aim to solve the problems that the related downward pressure testing mode is manual spot detection, the operation is complex, the detection efficiency is low, and a certain error exists. In a first aspect, the invention provides a push-down test system comprising a push-down module, a reference piece, a calculation module and a sensor; The pressing module is used for applying pressure to the reference piece, and the reference piece is used for simulating the pressed state of the wound bare cell in the pressing process; the sensor is used for acquiring sensing data of the reference piece in the compression process and sending the sensing data to the calculation module; the calculation module is used for obtaining the pressing information of the pressing module according to the sensing data; The sensing data comprise pressure data, and the pressing information comprises pressure uniformity and/or pressing inclination; and/or, the sensing data comprises displacement data, and the pressing information comprises pressing depth information. According to the technical scheme provided by the embodiment of the invention, the pressing state of the coiled bare cell in the pressing process is simulated by arranging the reference piece, the sensing data of the reference piece in the pressing process is obtained by the sensor, and the pressing information of the pressing module is detected according to the sensing data, so that the pressing test operation can be simplified, and the pressing test efficiency and accuracy can be improved. In some embodiments, the sensor comprises a pressure array disposed on the surface of the fiducial, the sensed data comprising pressure data, the hold-down information comprising pressure uniformity and/or hold-down slope, wherein, The pressure array is used for acquiring pressure data of the reference piece in the process of being pressed and sending the pressure data to the calculation module; The calculation module is further used for calculating pressure uniformity and/or pressing gradient of the pressing module according to the pressure data. According to the technical scheme, the sensor comprises the pressure array, the pressure array is arranged on the surface of the reference piece, the pressure array acquires pressure data of the reference piece in the pressing process and sends the pressure data to the calculation module, and the calculation module calculates pressure uniformity and/or pressing gradient of the pressing module according to the pressure data, so that the pressure uniformity and the pressing gradient in the pressing process can be accurately detected. In some embodiments, the calculating module is further configured to generate pressure distribution information on the reference member according to the pressure data, and calculate pressure uniformity of the pressing module according to the pressure distribution information. According to the technical scheme provided by the embodiment of the invention, the pressure distribution information on the reference piece is generated according to the pressure data, and then the pressure uniformity of the pressing module is calculated according to the pressure distribution information, so that the accuracy of pressure uniformity detection can be improved. In some embodiments, the calculating module is further configured to calculate a pressure dispersion evaluation parameter of each position on the reference member according to the pressure distribution informat