Intelligent adjustment method and device for battery cell preload
By intelligently adjusting the pretension force of the battery cell, the problem of pretension change caused by cell expansion is solved, and the testing stability and evaluation accuracy are improved.
Patent Information
- Application Number
- CN202411885430.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-04-04
AI Technical Summary
During the battery test, the preload force of the battery cell changes due to the expansion phenomenon, resulting in an increase in the risk of battery cell displacement and short circuit, affecting the accuracy of cyclic performance evaluation.
Through an intelligent adjustment method, the initial preloading parameters of the battery cell are determined, and the expansion force parameters are obtained in the charge and discharge cycle test to determine whether the preset preloading adjustment conditions are met. If so, preloading adjustment will be performed.
It improves the stability and positioning accuracy of the battery cell during the test process, reduces the battery cell displacement and short circuit situation, and improves the accuracy of battery cycle performance evaluation.
Smart Images
Figure CN119758125A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery testing technology, and in particular to a method and device for intelligently adjusting the preload force of a battery cell. Background Art
[0002] In the field of battery testing technology, the performance stability and safety of battery cells are key indicators for evaluating battery quality. At present, during the charge and discharge cycle of the battery cell, due to internal chemical reactions and heat accumulation, its temperature will inevitably rise. This temperature change has a significant impact on the chemical composition of the electrolyte. For example, the electrolyte vaporizes to produce gas, causing the battery cell to bulge. Initially, a certain preload can be applied to the battery cell through a fixture to ensure the stability and positioning accuracy of the battery cell during the test. However, as the battery cell expands, its original preload state will change. For example, due to the reaction of gas pressure, the preload is insufficient, causing the battery cell to shift during the cycle, increasing the risk of internal short circuit in the battery, thereby affecting the accuracy of the evaluation of the battery cycle performance. It can be seen that it is particularly important to provide a method that can dynamically and accurately adjust the preload of the battery cell. Summary of the invention
[0003] The present application provides a method and device for intelligently adjusting the preload force of a battery cell, which improves the stability and positioning accuracy of the battery cell during testing by automatically adjusting the preload force, thereby reducing the displacement and short circuit of the battery cell, thereby improving the accuracy of the battery cycle performance evaluation.
[0004] In order to solve the above technical problems, the first aspect of the present application discloses an intelligent adjustment method for the preload force of a battery cell, the method comprising:
[0005] Determine the initial preload parameters of the test cell;
[0006] According to the initial preload force parameter of the test cell, and by using a preset cell fixture, the test cell is initially fixed;
[0007] Performing a charge-discharge cycle test operation on the test cell after initial fixation, and obtaining an expansion force parameter of the test cell after initial fixation during the charge-discharge cycle test;
[0008] Based on the expansion force parameter and the initial preload parameter, determine whether the test cell after initial fixation meets the preset preload adjustment condition. If so, determine the preload adjustment parameter corresponding to the test cell after initial fixation, and perform preload adjustment operation on the test cell after initial fixation according to the preload adjustment parameter.
[0009] As an optional implementation, in the first aspect of the present application, determining the initial preload force parameter of the test cell includes:
[0010] Determine the external parameters of the test cell; the external parameters of the test cell include at least one of the shape parameters, size parameters and shell parameters of the test cell;
[0011] The initial preload force parameters of the test cell are determined according to the shape parameters of the test cell.
[0012] As an optional implementation, in the first aspect of the present application, the initial preload force parameter includes an initial preload force magnitude parameter, and the expansion force parameter includes an expansion force magnitude parameter;
[0013] Wherein, judging whether the test cell after initial fixation satisfies a preset preload adjustment condition based on the expansion force parameter and the initial preload parameter includes:
[0014] Determining a proportional relationship between the expansion force magnitude parameter and the initial preload force magnitude parameter according to the expansion force magnitude parameter and the initial preload force magnitude parameter;
[0015] According to the proportional relationship, determining whether the proportional relationship meets a preset proportional relationship condition;
[0016] When it is determined that the proportional relationship satisfies the proportional relationship condition, it is determined that the test cell after initial fixation satisfies a preset preload force adjustment condition.
[0017] As an optional implementation, in the first aspect of the present application, the proportional relationship condition is determined by the following method:
[0018] Acquire target parameters of the test cell; the target parameters of the test cell include at least one of electrolyte parameters, electrode parameters and diaphragm parameters of the test cell;
[0019] Acquire a cycle test parameter of the test cell, and predict an internal gas generation parameter of the test cell according to a target parameter of the test cell and the cycle test parameter of the test cell;
[0020] Acquire external parameters of the test cell, and determine expected expansion change parameters of the test cell according to the external parameters of the test cell and the internal gas generation parameters;
[0021] According to the expected expansion change parameter of the test cell, a proportional relationship condition corresponding to the test cell is determined.
[0022] As an optional embodiment, in the first aspect of the present application, the internal gas generation parameter of the test cell includes at least one of an internal gas generation amount parameter, an internal gas generation type parameter, an internal gas generation location parameter, and an internal gas generation temperature parameter of the test cell;
[0023] The expected expansion change parameter of the test cell includes at least one of an expected expansion change degree parameter of the test cell, an expected expansion change time parameter of the test cell, and an expected expansion change position parameter of the test cell.
[0024] As an optional implementation, in the first aspect of the present application, the preload force adjustment parameter includes a preload force adjustment size parameter;
[0025] Wherein, the determining of the preload adjustment parameter corresponding to the test cell after initial fixation includes:
[0026] Obtaining electrolyte parameters of the test cell; the electrolyte parameters of the test cell include solvent type parameters and / or solvent content ratio parameters;
[0027] According to the electrolyte parameters of the test cell and the initial preload force parameters of the test cell, the preload force adjustment parameters corresponding to the test cell after initial fixation are determined.
[0028] As an optional implementation, in the first aspect of the present application, the initial preload force parameter further includes an initial preload force position parameter, the expansion force parameter further includes an expansion force position parameter, and the preload force adjustment parameter further includes a preload force adjustment position parameter;
[0029] Wherein, the determining of the preload adjustment parameter corresponding to the test cell after initial fixation further includes:
[0030] According to the electrolyte parameters of the test cell, the initial preload position parameters of the test cell and the expansion force position parameters of the test cell after initial fixation, the preload adjustment position parameters corresponding to the test cell after initial fixation are determined.
[0031] As an optional implementation, in the first aspect of the present application, the preload adjustment operation is performed on the test cell after initial fixation according to the preload adjustment parameter, including:
[0032] Acquire the device parameters of the battery cell fixture; the device parameters include at least one of a device usage parameter, a device pressure range parameter, a device material parameter, and a device size parameter;
[0033] According to the preload force adjustment parameters and the equipment parameters of the battery cell fixture, a preload force adjustment operation is performed on the test battery cell after initial fixation.
[0034] The second aspect of the present application discloses an intelligent adjustment device for preload force of a battery cell, the device comprising:
[0035] A determination module, used to determine the initial preload force parameters of the test cell;
[0036] A fixing module, used to perform an initial fixing operation on the test cell according to the initial preload force parameter of the test cell and through a preset cell fixture;
[0037] An acquisition module is used to perform a charge-discharge cycle test operation on the test cell after initial fixation, and to acquire an expansion force parameter of the test cell after initial fixation during the charge-discharge cycle test;
[0038] A judgment module, used to judge whether the test cell after initial fixation meets a preset preload adjustment condition based on the expansion force parameter and the initial preload parameter;
[0039] The determination module is further configured to determine the preload adjustment parameter corresponding to the test cell after initial fixation when the determination result of the determination module is yes;
[0040] The regulating module is used to perform a preload regulating operation on the test cell after initial fixation according to the preload regulating parameter.
[0041] As an optional implementation, in the second aspect of the present application, the manner in which the determination module determines the initial preload force parameter of the test cell specifically includes:
[0042] Determine the external parameters of the test cell; the external parameters of the test cell include at least one of the shape parameters, size parameters and shell parameters of the test cell;
[0043] The initial preload force parameters of the test cell are determined according to the shape parameters of the test cell.
[0044] As an optional implementation, in the second aspect of the present application, the initial preload force parameter includes an initial preload force magnitude parameter, and the expansion force parameter includes an expansion force magnitude parameter;
[0045] The judgment module determines whether the test cell after initial fixation satisfies the preset preload adjustment condition based on the expansion force parameter and the initial preload parameter. Specifically, the judgment module determines whether the test cell after initial fixation satisfies the preset preload adjustment condition based on the expansion force parameter and the initial preload parameter.
[0046] Determining a proportional relationship between the expansion force magnitude parameter and the initial preload force magnitude parameter according to the expansion force magnitude parameter and the initial preload force magnitude parameter;
[0047] According to the proportional relationship, determining whether the proportional relationship meets a preset proportional relationship condition;
[0048] When it is determined that the proportional relationship satisfies the proportional relationship condition, it is determined that the test cell after initial fixation satisfies a preset preload force adjustment condition.
[0049] As an optional implementation, in the second aspect of the present application, the proportional relationship condition is determined by the following method:
[0050] Acquire target parameters of the test cell; the target parameters of the test cell include at least one of electrolyte parameters, electrode parameters and diaphragm parameters of the test cell;
[0051] Acquire a cycle test parameter of the test cell, and predict an internal gas generation parameter of the test cell according to a target parameter of the test cell and the cycle test parameter of the test cell;
[0052] Acquire external parameters of the test cell, and determine expected expansion change parameters of the test cell according to the external parameters of the test cell and the internal gas generation parameters;
[0053] According to the expected expansion change parameter of the test cell, a proportional relationship condition corresponding to the test cell is determined.
[0054] As an optional embodiment, in the second aspect of the present application, the internal gas generation parameter of the test cell includes at least one of an internal gas generation amount parameter, an internal gas generation type parameter, an internal gas generation location parameter, and an internal gas generation temperature parameter of the test cell;
[0055] The expected expansion change parameter of the test cell includes at least one of an expected expansion change degree parameter of the test cell, an expected expansion change time parameter of the test cell, and an expected expansion change position parameter of the test cell.
[0056] As an optional implementation, in the second aspect of the present application, the preload force adjustment parameter includes a preload force adjustment size parameter;
[0057] The method in which the determination module determines the preload adjustment parameter corresponding to the test cell after initial fixation specifically includes:
[0058] Obtaining electrolyte parameters of the test cell; the electrolyte parameters of the test cell include solvent type parameters and / or solvent content ratio parameters;
[0059] According to the electrolyte parameters of the test cell and the initial preload force parameters of the test cell, the preload force adjustment parameters corresponding to the test cell after initial fixation are determined.
[0060] As an optional implementation, in the second aspect of the present application, the initial preload force parameter further includes an initial preload force position parameter, the expansion force parameter further includes an expansion force position parameter, and the preload force adjustment parameter further includes a preload force adjustment position parameter;
[0061] The method in which the determination module determines the preload adjustment parameter corresponding to the test cell after initial fixation specifically includes:
[0062] According to the electrolyte parameters of the test cell, the initial preload position parameters of the test cell and the expansion force position parameters of the test cell after initial fixation, the preload adjustment position parameters corresponding to the test cell after initial fixation are determined.
[0063] As an optional implementation, in the second aspect of the present application, the adjustment module performs a preload adjustment operation on the test cell after initial fixation according to the preload adjustment parameter, specifically including:
[0064] Acquire the device parameters of the battery cell fixture; the device parameters include at least one of a device usage parameter, a device pressure range parameter, a device material parameter, and a device size parameter;
[0065] According to the preload force adjustment parameters and the equipment parameters of the battery cell fixture, a preload force adjustment operation is performed on the test battery cell after initial fixation.
[0066] The third aspect of the present application discloses another intelligent adjustment device for preload force of a battery cell, the device comprising:
[0067] A memory storing executable program code;
[0068] a processor coupled to the memory;
[0069] The processor calls the executable program code stored in the memory to execute the intelligent adjustment method for the preload force of the battery cell disclosed in the first aspect of the present application.
[0070] The fourth aspect of the present application discloses a computer storage medium, which stores computer instructions. When the computer instructions are called, they are used to execute the intelligent adjustment method of the battery cell preload force disclosed in the first aspect of the present application.
[0071] Compared with the prior art, the embodiments of the present application have the following beneficial effects:
[0072] In an embodiment of the present application, an initial fixing operation is performed on the test cell according to an initial preload force parameter of the test cell and through a preset cell clamp; a charge-discharge cycle test operation is performed on the test cell after initial fixing, and during the charge-discharge cycle test, an expansion force parameter of the test cell after initial fixing is obtained; based on the expansion force parameter and the initial preload force parameter, it is determined whether the test cell after initial fixing meets the preset preload force adjustment condition, and if so, the preload force of the test cell after initial fixing is adjusted according to the preload force adjustment parameter, so that the stability and positioning accuracy of the cell during the test process are improved by automatic adjustment of the preload force, thereby reducing the displacement of the cell and the occurrence of short circuit, thereby improving the accuracy of the battery cycle performance evaluation. BRIEF DESCRIPTION OF THE DRAWINGS
[0073] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0074] Figure 1 It is a flow chart of an intelligent adjustment method of a battery cell preload force disclosed in an embodiment of the present application;
[0075] Figure 2 It is a flow chart of another intelligent adjustment method for preload force of a battery cell disclosed in an embodiment of the present application;
[0076] Figure 3 It is a structural schematic diagram of an intelligent adjustment device for preload force of a battery cell disclosed in an embodiment of the present application;
[0077] Figure 4 It is a structural schematic diagram of another intelligent adjustment device for battery cell preload force disclosed in an embodiment of the present application. DETAILED DESCRIPTION
[0078] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0079] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, device, product or end that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or ends.
[0080] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0081] The present application discloses an intelligent adjustment method and device for the preload force of a battery cell, which improves the stability and positioning accuracy of the battery cell during testing by automatically adjusting the preload force, thereby reducing the displacement and short circuit of the battery cell, thereby improving the accuracy of the evaluation of the battery's cycle performance.
[0082] Embodiment 1
[0083] See also Figure 1 , Figure 1 : is a flowchart of a method for intelligently adjusting the preload force of a battery cell disclosed in an embodiment of the present application. Optionally, the method can be implemented by a preload force adjustment system, which can be integrated in a battery cell testing device, or a local server or cloud server for processing the intelligent adjustment process of the preload force of the battery cell, etc., which is not limited in the embodiment of the present application. Figure 1 As shown, the intelligent adjustment method of the battery cell preload force may include the following operations:
[0084] 101. Determine the initial preload parameters of the test cell.
[0085] In the embodiment of the present application, the initial preload force parameter includes an initial preload force magnitude parameter and an initial preload force position parameter.
[0086] Furthermore, the initial preload parameters of the test cell are determined, including:
[0087] Determine the external parameters of the test cell;
[0088] According to the appearance parameters of the test cell, the initial preload force parameters of the test cell are determined.
[0089] In this optional embodiment, optionally, the external parameters of the test cell include at least one of a shape parameter, a size parameter, and a shell parameter of the test cell.
[0090] For example, before testing, the battery cell fixture is installed, and then the matching initial preload force parameter F0 is determined according to the size range of the battery cell (the range of F0 may be: 100kgf to 500kgf).
[0091] 102. Perform initial fixing operation on the test cell according to the initial preload force parameters of the test cell and through a preset cell fixture.
[0092] 103. Perform a charge-discharge cycle test operation on the initially fixed test cell, and during the charge-discharge cycle test, obtain an expansion force parameter of the initially fixed test cell.
[0093] In the embodiment of the present application, the expansion force parameter includes an expansion force magnitude parameter and an expansion force position parameter.
[0094] Among them, the charge and discharge cycle test operation can refer to the following steps (the specific parameter settings can be adjusted according to the battery test requirements and are not unique):
[0095] 1) Perform five cycles of capacity calibration on the test cell at room temperature (capacity calibration: 1C constant current charge to 3.65V, switch to constant voltage charge until the current drops to 0.05C and then cut off; leave for 30 minutes; 1C discharge to 2.5V; leave for 30 minutes), activate the capacity of the test cell, and record the last cycle of discharge capacity as Q0;
[0096] 2) Charge in steps (1C to 80% Q nom , 0.8C charge to 3.5V, 0.5C charge to 3.6V, 0.1C charge to 3.65V) fully charge the test cell;
[0097] 3) Set aside for 30 minutes;
[0098] 4) 1C constant current discharge to 2.5V, record the discharge capacity as Q1;
[0099] 5) When the cycle reaches Q1≤95%Q nom When the current is reduced, 0.95C is used as 1C for step charging (0.95*1C is charged to 0.95*80%Q nom , 0.95*0.8C charging to 3.5V, 0.95*0.5C charging to 3.6V, 0.95*0.1C charging to 3.65V) fully charge the test battery;
[0100] 6) Set aside for 30 minutes;
[0101] 7) 1C constant current discharge to 2.5V, record the discharge capacity as Q2;
[0102] 8) When the cycle reaches Q2≤0.9Q nom , reduce the current, use 0.9C as 1C step charge (0.9*1C charge to 0.95*80%Q nom , 0.9*0.8C charging to 3.5V, 0.9*0.5C charging to 3.6V, 0.9*0.1C charging to 3.65V) fully charge the test battery;
[0103] 9) Set aside for 30 minutes;
[0104] 10) 1C constant current discharge to 2.5V, record the discharge capacity as Q3;
[0105] 11) And so on, until the tested cell reaches EOL state 70% SOH and stops testing (Note: Q nom To test the nominal capacity of the battery cell, that is, the design capacity).
[0106] 104. Based on the expansion force parameter and the initial preload force parameter, determine whether the test cell after initial fixation meets the preset preload force adjustment condition. If so, determine the preload force adjustment parameter corresponding to the test cell after initial fixation, and perform preload force adjustment operation on the test cell after initial fixation according to the preload force adjustment parameter.
[0107] In the embodiment of the present application, the preload force adjustment parameter includes a preload force adjustment size parameter and a preload force adjustment position parameter.
[0108] Furthermore, when it is determined that the test cell after initial fixation does not meet the preset preload force adjustment conditions, there is no need to adjust the preload force of the test cell after initial fixation, and the test cell continues to be fixed with the initial preload force parameters.
[0109] It can be seen that the implementation of the embodiment of the present application can perform an initial fixing operation on the test cell according to the initial preload force parameters of the test cell through the cell clamp, and then obtain the expansion force parameters of the test cell after initial fixation during the charge and discharge cycle test of the test cell, thereby realizing automatic adjustment of the preload force of the test cell after initial fixation based on the expansion force parameters and the preload force parameters. In this way, the stability and positioning accuracy of the cell during the test process are improved through automatic adjustment of the preload force, thereby reducing the displacement of the cell and the occurrence of short circuit, thereby improving the accuracy of the battery cycle performance evaluation.
[0110] In an optional embodiment, judging whether the initially fixed test cell meets a preset preload adjustment condition based on the expansion force parameter and the initial preload parameter in step 104 includes:
[0111] Determine a proportional relationship between the expansion force magnitude parameter and the initial preload force magnitude parameter according to the expansion force magnitude parameter and the initial preload force magnitude parameter;
[0112] According to the proportional relationship, judging whether the proportional relationship meets a preset proportional relationship condition;
[0113] When it is determined that the proportional relationship satisfies the proportional relationship condition, it is determined that the test cell after initial fixation satisfies the preset preload force adjustment condition.
[0114] In this optional embodiment, the proportional relationship condition is determined in the following manner:
[0115] Obtain target parameters of the test cell;
[0116] Obtaining cycle test parameters of the test cell, and predicting internal gas generation parameters of the test cell according to target parameters of the test cell and the cycle test parameters of the test cell;
[0117] Obtaining external parameters of the test cell, and determining expected expansion change parameters of the test cell according to the external parameters of the test cell and internal gas generation parameters;
[0118] According to the expected expansion change parameters of the test cell, the proportional relationship conditions corresponding to the test cell are determined.
[0119] In this optional embodiment, optionally, the target parameter of the test cell includes at least one of the electrolyte parameter, electrode parameter and diaphragm parameter of the test cell. Further optionally, the internal gas generation parameter of the test cell includes at least one of the internal gas generation amount parameter, internal gas generation type parameter, internal gas generation location parameter and internal gas generation temperature parameter of the test cell, and the expected expansion change parameter of the test cell includes at least one of the expected expansion change degree parameter of the test cell, the expected expansion change time parameter of the test cell and the expected expansion change location parameter of the test cell.
[0120] For example, when the test cell is subjected to a charge and discharge cycle test according to the above steps, the expansion force parameter F is obtained. p And the initial preload force parameter F c , and F p ≤1.8F c (Wherein, the preset proportional relationship condition is F p >1.8F c ), then we can determine F p With F cThe proportional relationship between them does not meet the preset proportional relationship condition, that is, the test cell after initial fixation does not meet the preset preload adjustment condition, and there is no need to perform preload adjustment operation on the test cell after initial fixation; and if the obtained F p With F c The ratio between them is 1.8F c <F p ≤3.5F c When F p With F c The proportional relationship between them satisfies the preset proportional relationship condition, that is, the test cell after initial fixation satisfies the preset preload adjustment condition, and the preload adjustment operation needs to be performed on the test cell after initial fixation.
[0121] It can be seen that this optional embodiment can determine whether the test cell meets the preset preload adjustment conditions based on the proportional relationship between the expansion force size parameter corresponding to the test cell and the initial preload force size parameter. This is conducive to improving the execution reliability and accuracy of the preload adjustment condition determination operation of the test cell, and further conducive to improving the reliability and accuracy of the preload adjustment of the test cell, so as to optimize the cycle performance test process of the test cell and improve the test reliability and stability; at the same time, it is also possible to determine the proportional relationship conditions that match the test cell based on the target parameters, cycle test parameters and external parameters of the cell, which is conducive to improving the reliability and accuracy of determining the proportional relationship conditions corresponding to the test cell.
[0122] Embodiment 2
[0123] See also Figure 2 , Figure 2 : is a flow chart of another method for intelligently adjusting the preload force of a battery cell disclosed in an embodiment of the present application. Optionally, the method can be implemented by a preload force adjustment system, which can be integrated in a battery cell testing device, or a local server or cloud server for processing the intelligent adjustment process of the preload force of the battery cell, etc., which is not limited in the embodiment of the present application. Figure 2 As shown, the intelligent adjustment method of the battery cell preload force may include the following operations:
[0124] 201. Determine the initial preload parameters of the test cell.
[0125] 202. Perform an initial fixing operation on the test cell according to the initial preload force parameters of the test cell and using a preset cell fixture.
[0126] 203. Perform a charge-discharge cycle test operation on the initially fixed test cell, and during the charge-discharge cycle test, obtain an expansion force parameter of the initially fixed test cell.
[0127] 204. Based on the expansion force parameter and the initial preload force parameter, determine whether the test cell after initial fixation meets a preset preload force adjustment condition. If so, obtain the electrolyte parameter of the test cell.
[0128] In the embodiment of the present application, optionally, the electrolyte parameters of the test cell include solvent type parameters and / or solvent content ratio parameters, such as the electrolyte of the test cell contains 30% ethylene carbonate.
[0129] 205. Determine a preload adjustment parameter corresponding to the initially fixed test cell according to an electrolyte parameter of the test cell and an initial preload parameter of the test cell.
[0130] In the embodiment of the present application, for example, if the proportional relationship between the expansion force size parameter of the test cell and the initial preload force size parameter satisfies 1.8F c <F p ≤3.5F c When the preload force is adjusted, the parameter F t The adjustment range can be determined according to the following calculation formula: Or if the proportional relationship between the expansion force parameter of the test cell and the initial preload force parameter satisfies F p >3.5F c When the preload force is adjusted, the parameter F t The adjustment range can be determined according to the following calculation formula: Among them, n1, n2, n3, n4, m1, m2, m3, and m4 are all preset constants (the process of determining the specific values can refer to the method of determining the proportional relationship conditions mentioned above), and ω is the content ratio parameter of ethylene carbonate contained in the electrolyte of the test battery cell.
[0131] Furthermore, the method also includes:
[0132] According to the electrolyte parameters of the test cell, the initial preload position parameters of the test cell and the expansion force position parameters of the test cell after initial fixation, the preload adjustment position parameters corresponding to the test cell after initial fixation are determined.
[0133] In this optional embodiment, it can be understood that the performance test impact situation corresponding to the expansion area of the test cell after initial fixation is determined based on the electrolyte parameters of the test cell, the initial preload position parameters of the test cell and the expansion force position parameters of the test cell after initial fixation, and then based on the performance test impact situation, the preload adjustment position parameters corresponding to the test cell after initial fixation are determined, wherein the performance test impact situation includes the jitter frequency of the performance test results and / or the jitter amplitude of the performance test results.
[0134] 206. According to the preload force adjustment parameter, a preload force adjustment operation is performed on the test battery cell after initial fixation.
[0135] In the embodiment of the present application, for other descriptions of step 201 to step 203 and step 206, please refer to the detailed description of step 101 to step 104 in embodiment 1, and the embodiment of the present application will not be repeated.
[0136] It can be seen that the implementation of the embodiments of the present application can determine the preload adjustment size / position parameters corresponding to the test cell after initial fixation according to the electrolyte parameters of the test cell and the initial preload size / position parameters, and then realize the preload adjustment process of the test cell after initial fixation. In this way, the reliability and accuracy of determining the preload adjustment size / position parameters corresponding to the test cell after initial fixation are improved, thereby improving the reliability and accuracy of preload adjustment of the test cell after initial fixation, reducing the occurrence of cell displacement and cycle performance test abnormalities caused by gas production in the test cell, thereby improving the stability of the cycle performance test of the test cell and the accuracy of performance evaluation.
[0137] In an optional embodiment, the preload adjustment operation is performed on the initially fixed test cell according to the preload adjustment parameter in step 206, including:
[0138] Get the equipment parameters of the battery cell fixture;
[0139] According to the preload force adjustment parameters and the equipment parameters of the battery cell fixture, the preload force adjustment operation is performed on the test battery cell after initial fixation.
[0140] In this optional embodiment, optionally, the device parameters include at least one of a device usage parameter, a device pressure range parameter (the device pressure range parameter determines the maximum and minimum preload forces that the battery cell clamp can apply, thereby ensuring that the adjustment operation is performed within a safe range), a device material parameter, and a device size parameter.
[0141] It can be seen that this optional embodiment can perform preload adjustment operations on the test cell after initial fixation according to the preload adjustment parameters and the equipment parameters of the cell clamp. In this way, by precisely controlling the preload of the test cell, the contact state between the cell and the clamp can be optimized, thereby ensuring the stability and safety of the test cell during the test, and then effectively preventing the cell from loosening or deforming during the test, thereby ensuring the accuracy and reliability of the cell performance test results; at the same time, it also improves the safety of using the cell clamp.
[0142] Embodiment 3
[0143] See also Figure 3 , Figure 3 Schematic diagram of the structure of an intelligent adjustment device for preload force of a battery cell disclosed in an embodiment of the present application. Figure 3 As shown, the intelligent adjustment device for the preload force of the battery cell may include:
[0144] A determination module 301 is used to determine the initial preload force parameters of the test cell;
[0145] The fixing module 302 is used to perform an initial fixing operation on the test cell according to the initial preload force parameter of the test cell and through a preset cell fixture;
[0146] The acquisition module 303 performs a charge-discharge cycle test operation on the initially fixed test cell, and during the charge-discharge cycle test, acquires an expansion force parameter of the initially fixed test cell; the expansion force parameter includes an expansion force magnitude parameter;
[0147] A judgment module 304 is used to judge whether the test cell after initial fixation meets a preset preload adjustment condition based on the expansion force parameter and the initial preload parameter;
[0148] The determination module 301 is further used to determine the preload adjustment parameter corresponding to the initially fixed test cell when the determination result of the determination module 304 is yes;
[0149] The adjustment module 305 is used to perform a preload adjustment operation on the test cell after initial fixation according to the preload adjustment parameter.
[0150] In the embodiment of the present application, the initial preload force parameter includes an initial preload force magnitude parameter.
[0151] Furthermore, the method in which the determination module 301 determines the initial preload force parameter of the test cell specifically includes:
[0152] Determine the external parameters of the test cell;
[0153] According to the appearance parameters of the test cell, the initial preload force parameters of the test cell are determined.
[0154] In this optional embodiment, the external parameters of the test cell include at least one of a shape parameter, a size parameter, and a shell parameter of the test cell.
[0155] It can be seen that the implementation Figure 3The described intelligent adjustment device for the preload force of the battery cell can perform an initial fixing operation on the test battery cell according to the initial preload force parameters of the test battery cell through a battery cell clamp, and then obtain the expansion force parameters of the test battery cell after the initial fixation during the charge and discharge cycle test of the test battery cell, thereby automatically adjusting the preload force of the test battery cell after the initial fixation based on the expansion force parameters and the preload force parameters. In this way, the stability and positioning accuracy of the battery cell during the test process are improved through automatic adjustment of the preload force, thereby reducing the occurrence of battery cell displacement and short circuit, thereby improving the accuracy of the battery cycle performance evaluation.
[0156] In an optional embodiment, the judgment module 304 judges whether the test cell after initial fixation meets the preset preload adjustment condition based on the expansion force parameter and the initial preload parameter, specifically including:
[0157] Determine a proportional relationship between the expansion force magnitude parameter and the initial preload force magnitude parameter according to the expansion force magnitude parameter and the initial preload force magnitude parameter;
[0158] According to the proportional relationship, judging whether the proportional relationship meets a preset proportional relationship condition;
[0159] When it is determined that the proportional relationship satisfies the proportional relationship condition, it is determined that the test cell after initial fixation satisfies the preset preload force adjustment condition.
[0160] In this optional embodiment, further, the proportional relationship condition is determined in the following manner:
[0161] Obtain target parameters of the test cell;
[0162] Obtaining cycle test parameters of the test cell, and predicting internal gas generation parameters of the test cell according to target parameters of the test cell and the cycle test parameters of the test cell;
[0163] Obtaining external parameters of the test cell, and determining expected expansion change parameters of the test cell according to the external parameters of the test cell and internal gas generation parameters;
[0164] According to the expected expansion change parameters of the test cell, the proportional relationship conditions corresponding to the test cell are determined.
[0165] In this optional embodiment, the target parameters of the test cell include at least one of the electrolyte parameters, electrode parameters and diaphragm parameters of the test cell; the internal gas generation parameters of the test cell include at least one of the internal gas generation amount parameter, internal gas generation type parameter, internal gas generation location parameter and internal gas generation temperature parameter of the test cell; the expected expansion change parameters of the test cell include at least one of the expected expansion change degree parameter of the test cell, the expected expansion change time parameter of the test cell and the expected expansion change location parameter of the test cell.
[0166] It can be seen that the implementation Figure 3 The described intelligent adjustment device for the preload force of the battery cell can determine whether the test battery cell meets the preset preload force adjustment conditions according to the proportional relationship between the expansion force size parameter corresponding to the test battery cell and the initial preload force size parameter. This is conducive to improving the execution reliability and accuracy of the preload force adjustment condition determination operation of the test battery cell, and further to improving the reliability and accuracy of the preload force adjustment of the test battery cell, thereby facilitating the optimization of the cycle performance test process of the test battery cell and improving the test reliability and stability. At the same time, it is also possible to determine the proportional relationship conditions that match the test battery cell based on the target parameters, cycle test parameters and external parameters of the battery cell, which is conducive to improving the reliability and accuracy of determining the proportional relationship conditions corresponding to the test battery cell.
[0167] In another optional embodiment, the preload force adjustment parameter includes a preload force adjustment size parameter;
[0168] The method in which the determination module 301 determines the preload adjustment parameter corresponding to the initially fixed test cell specifically includes:
[0169] Get the electrolyte parameters of the test cell;
[0170] According to the electrolyte parameters of the test cell and the initial preload force parameters of the test cell, the preload force adjustment parameters corresponding to the initially fixed test cell are determined.
[0171] In this optional embodiment, the electrolyte parameters of the test cell include solvent type parameters and / or solvent content ratio parameters.
[0172] Further, the initial preload force parameter also includes an initial preload force position parameter, the expansion force parameter also includes an expansion force position parameter, and the preload force adjustment parameter also includes a preload force adjustment position parameter;
[0173] The method in which the determination module 301 determines the preload adjustment parameter corresponding to the initially fixed test cell specifically includes:
[0174] According to the electrolyte parameters of the test cell, the initial preload position parameters of the test cell and the expansion force position parameters of the test cell after initial fixation, the preload adjustment position parameters corresponding to the test cell after initial fixation are determined.
[0175] It can be seen that the implementation Figure 3 The described intelligent adjustment device for the preload force of the battery cell can determine the preload force adjustment size / position parameters corresponding to the test battery cell after initial fixation according to the electrolyte parameters of the test battery cell and the initial preload force size / position parameters, and then realize the preload force adjustment process of the test battery cell after initial fixation. In this way, the reliability and accuracy of determining the preload force adjustment size / position parameters corresponding to the test battery cell after initial fixation are improved, thereby improving the reliability and accuracy of the preload force adjustment of the test battery cell after initial fixation, reducing the occurrence of battery cell displacement and cycle performance test abnormalities caused by gas production in the test battery cell, thereby improving the stability of the cycle performance test of the test battery cell and the accuracy of performance evaluation.
[0176] In another optional embodiment, the adjustment module 305 performs the preload adjustment operation on the initially fixed test cell according to the preload adjustment parameter, specifically including:
[0177] Get the equipment parameters of the battery cell fixture;
[0178] According to the preload force adjustment parameters and the equipment parameters of the battery cell fixture, the preload force adjustment operation is performed on the test battery cell after initial fixation.
[0179] In this optional embodiment, the device parameters include at least one of device usage parameters, device pressure range parameters, device material parameters, and device size parameters.
[0180] It can be seen that the implementation Figure 3 The described intelligent adjustment device for the preload force of the battery cell can adjust the preload force of the test battery cell after initial fixation according to the preload force adjustment parameters and the equipment parameters of the battery cell clamp. In this way, by accurately controlling the preload force of the test battery cell, the contact state between the battery cell and the clamp can be optimized, thereby ensuring the stability and safety of the test battery cell during the test process, and then effectively preventing the battery cell from loosening or deforming during the test, thereby ensuring the accuracy and reliability of the battery cell performance test results; at the same time, it also improves the safety of the use of the battery cell clamp.
[0181] Embodiment 4
[0182] See also Figure 4 , Figure 4 Schematic diagram of another intelligent adjustment device for cell preload force disclosed in the embodiment of the present application. Figure 4 As shown, the intelligent adjustment device for the preload force of the battery cell may include:
[0183] A memory 401 storing executable program codes;
[0184] a processor 402 coupled to the memory 401;
[0185] The processor 402 calls the executable program code stored in the memory 401 to execute the steps in the intelligent adjustment method of the preload force of the battery cell described in the first embodiment of the present application or the second embodiment of the present application.
[0186] Embodiment 5
[0187] An embodiment of the present application discloses a computer storage medium, which stores computer instructions. When the computer instructions are called, they are used to execute the steps of the intelligent adjustment method of the preload force of the battery cell described in Embodiment 1 or Embodiment 2 of the present application.
[0188] Embodiment 6
[0189] An embodiment of the present application discloses a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to enable a computer to execute the steps in the intelligent adjustment method for battery cell preload described in Embodiment 1 or Embodiment 2.
[0190] The device embodiments described above are only illustrative, wherein the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, i.e., they may be located in one place, or they may be distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative work.
[0191] Through the specific description of the above embodiments, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the above technical solution can be essentially or partly contributed to the prior art in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, and the storage medium includes a read-only memory (ROM), a random access memory (RAM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), a one-time programmable read-only memory (OTPROM), an electronically erasable rewritable read-only memory (EEPROM), a compact disc (CD-ROM) or other optical disc storage, magnetic disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.
[0192] Finally, it should be noted that the intelligent adjustment method and device for the preload force of a battery cell disclosed in the embodiment of the present application only discloses the preferred embodiment of the present application, which is only used to illustrate the technical solution of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that the technical solutions recorded in the aforementioned embodiments can still be modified, or some of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application.
Claims
1. An intelligent adjustment method for preload force of a battery cell, characterized in that: The method comprises: Determine the initial preload parameters of the test cell; According to the initial preload force parameter of the test cell, and by using a preset cell fixture, the test cell is initially fixed; Performing a charge-discharge cycle test operation on the test cell after initial fixation, and obtaining an expansion force parameter of the test cell after initial fixation during the charge-discharge cycle test; Based on the expansion force parameter and the initial preload parameter, determine whether the test cell after initial fixation meets the preset preload adjustment condition. If so, determine the preload adjustment parameter corresponding to the test cell after initial fixation, and perform preload adjustment operation on the test cell after initial fixation according to the preload adjustment parameter.
2. The intelligent adjustment method for preload of a battery cell according to claim 1, characterized in that: The step of determining the initial preload force parameters of the test cell comprises: Determine the external parameters of the test cell; the external parameters of the test cell include at least one of the shape parameters, size parameters and shell parameters of the test cell; The initial preload force parameters of the test cell are determined according to the shape parameters of the test cell.
3. The intelligent adjustment method for preload of a battery cell according to claim 1, characterized in that: The initial preload force parameter includes an initial preload force magnitude parameter, and the expansion force parameter includes an expansion force magnitude parameter; Wherein, judging whether the test cell after initial fixation satisfies a preset preload adjustment condition based on the expansion force parameter and the initial preload parameter includes: Determining a proportional relationship between the expansion force magnitude parameter and the initial preload force magnitude parameter according to the expansion force magnitude parameter and the initial preload force magnitude parameter; According to the proportional relationship, determining whether the proportional relationship meets a preset proportional relationship condition; When it is determined that the proportional relationship satisfies the proportional relationship condition, it is determined that the test cell after initial fixation satisfies a preset preload force adjustment condition.
4. The intelligent adjustment method for preload of a battery cell according to claim 3, characterized in that: The proportional relationship condition is determined in the following way: Acquire target parameters of the test cell; the target parameters of the test cell include at least one of electrolyte parameters, electrode parameters and diaphragm parameters of the test cell; Acquire a cycle test parameter of the test cell, and predict an internal gas generation parameter of the test cell according to a target parameter of the test cell and the cycle test parameter of the test cell; Acquire external parameters of the test cell, and determine expected expansion change parameters of the test cell according to the external parameters of the test cell and the internal gas generation parameters; According to the expected expansion change parameter of the test cell, a proportional relationship condition corresponding to the test cell is determined.
5. The intelligent adjustment method for preload force of a battery cell according to claim 4, characterized in that: The internal gas generation parameter of the test cell includes at least one of an internal gas generation amount parameter, an internal gas generation type parameter, an internal gas generation location parameter, and an internal gas generation temperature parameter of the test cell; The expected expansion change parameter of the test cell includes at least one of an expected expansion change degree parameter of the test cell, an expected expansion change time parameter of the test cell, and an expected expansion change position parameter of the test cell.
6. The intelligent adjustment method for preload of a battery cell according to any one of claims 3 to 5, characterized in that: The preload force adjustment parameter includes a preload force adjustment size parameter; Wherein, the determining of the preload adjustment parameter corresponding to the test cell after initial fixation includes: Obtaining electrolyte parameters of the test cell; the electrolyte parameters of the test cell include solvent type parameters and / or solvent content ratio parameters; According to the electrolyte parameters of the test cell and the initial preload force parameters of the test cell, the preload force adjustment parameters corresponding to the test cell after initial fixation are determined.
7. The intelligent adjustment method for preload of a battery cell according to claim 6, characterized in that: The initial preload force parameter also includes an initial preload force position parameter, the expansion force parameter also includes an expansion force position parameter, and the preload force adjustment parameter also includes a preload force adjustment position parameter; Wherein, the determining of the preload adjustment parameter corresponding to the test cell after initial fixation further includes: According to the electrolyte parameters of the test cell, the initial preload position parameters of the test cell and the expansion force position parameters of the test cell after initial fixation, the preload adjustment position parameters corresponding to the test cell after initial fixation are determined.
8. The intelligent adjustment method for preload of a battery cell according to claim 7, characterized in that: The step of performing a preload adjustment operation on the initially fixed test cell according to the preload adjustment parameter includes: Acquire the device parameters of the battery cell fixture; the device parameters include at least one of a device usage parameter, a device pressure range parameter, a device material parameter, and a device size parameter; According to the preload force adjustment parameters and the equipment parameters of the battery cell fixture, a preload force adjustment operation is performed on the test battery cell after initial fixation.
9. An intelligent adjustment device for preload force of a battery cell, characterized in that: The device comprises: A memory storing executable program code; a processor coupled to the memory; The processor calls the executable program code stored in the memory to execute the intelligent adjustment method for the preload force of the battery cell as described in any one of claims 1 to 8.
10. A computer storage medium, characterized in that: The computer storage medium stores computer instructions, and when the computer instructions are called, they are used to execute the intelligent adjustment method for the preload force of the battery cell as described in any one of claims 1 to 8.