CN112531199A - Glue optimization method and system for battery module and test tool - Google Patents
Glue optimization method and system for battery module and test tool Download PDFInfo
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- CN112531199A CN112531199A CN202011519195.2A CN202011519195A CN112531199A CN 112531199 A CN112531199 A CN 112531199A CN 202011519195 A CN202011519195 A CN 202011519195A CN 112531199 A CN112531199 A CN 112531199A
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- 239000003292 glue Substances 0.000 title claims abstract description 227
- 238000012360 testing method Methods 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000005457 optimization Methods 0.000 title claims abstract description 47
- 238000004088 simulation Methods 0.000 claims abstract description 60
- 238000004026 adhesive bonding Methods 0.000 claims abstract description 15
- 239000012790 adhesive layer Substances 0.000 claims description 45
- 239000010410 layer Substances 0.000 claims description 43
- 239000000853 adhesive Substances 0.000 claims description 19
- 230000001070 adhesive effect Effects 0.000 claims description 19
- 229920000297 Rayon Polymers 0.000 claims description 15
- 238000003825 pressing Methods 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 11
- 238000013461 design Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 229920002635 polyurethane Polymers 0.000 description 4
- 239000004814 polyurethane Substances 0.000 description 4
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000010187 selection method Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention discloses a glue optimization method and system for a battery module and a test tool. The glue optimization method for the battery module comprises the steps of presetting initial conditions, wherein the preset initial conditions comprise a gluing mode and initial glue; modeling under the preset initial condition; carrying out analog simulation; extracting stress in at least one direction, and obtaining a strength standard according to the stress and the safety coefficient; and obtaining the selected glue according to the strength standard. According to the glue optimization method and system for the battery module and the testing tool, disclosed by the embodiment of the invention, the strength standard can be efficiently and accurately obtained, and the time and the testing cost are saved.
Description
Technical Field
The invention relates to the technical field of battery modules, in particular to a glue optimization method and system for a battery module and a test tool.
Background
In recent years, development of new energy automobiles has become common knowledge, and in the new energy automobiles, a battery pack is a main carrier of the new energy automobiles, and is mainly used for providing a mounting structure for each system element inside the battery pack and protecting each component.
New energy automobile develops fast, has proposed higher demand to the lightweight of battery package. In the prior art, an interesting design idea is a CTP technology (Cell To Pack, a module-free technology), that is, a battery module is simplified as much as possible, a high-strength and high-rigidity protection structure is not designed, and a battery core is directly adhered To a box body by using an adhesive method. The method puts high requirements on the reliability of the adhesive, and needs to perform full evaluation and test verification on the adhesive in the development stage. In order to determine whether the adhesive can meet the requirement, the battery pack generally needs to be subjected to CAE (Computer Aided Engineering) simulation or test under a severe working condition. However, in the CAE simulation, an efficient and accurate method for evaluating the glue is lacking, and it is not possible to determine whether the selected glue can meet the requirements. The testing method is used for verifying, and the specific performance requirements of the glue cannot be known, so that the whole system can be used as a test sample only for testing the grade of the battery pack, and a large amount of time cost and test cost are required.
Therefore, it is desirable to have a new glue optimization method and system for a battery module, and a test fixture, which can overcome the above problems.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a glue optimization method and system for a battery module, and a testing tool, which can efficiently and accurately obtain a strength standard, thereby saving time and testing cost.
According to an aspect of the present invention, there is provided a glue optimization method for a battery module, the glue being used for bonding the battery module, including: presetting initial conditions, wherein the preset initial conditions comprise a gluing mode and initial glue; modeling under the preset initial condition; carrying out analog simulation; extracting stress in at least one direction, and obtaining a strength standard according to the stress and the safety coefficient; and obtaining the selected glue according to the strength standard.
Preferably, said obtaining the selected glue according to said strength criteria comprises: selecting a glue of a different type than the initial glue to meet the strength criterion when the performance parameter of the initial glue is below the strength criterion.
Preferably, said obtaining the selected glue according to said strength criteria comprises: when the performance parameter of the initial glue is higher than the strength standard, selecting a different type of glue than the initial glue to reduce glue costs.
Preferably, the glue optimization method further comprises the steps of constructing a virtual battery module according to initial parameters of the virtual battery module; and performing analog simulation on the virtual battery module according to the severe working conditions, wherein the severe working conditions comprise at least one of vibration, impact and collision.
Preferably, the performing simulation includes designating the viscose units as a set, and performing simulation under the condition that the viscose units are a set.
Preferably, the extracting of the stress in at least one direction, and according to the stress and the safety factor, obtaining the strength standard comprises writing a secondary development program, and rapidly extracting the stress in each direction of the glue unit to obtain the stress of the initial glue; and selecting a safety factor, and obtaining the strength standard according to the stress of the initial glue and the safety factor.
According to another aspect of the present invention, a glue optimization system for a battery module is provided, which includes a presetting unit for presetting initial conditions, wherein the preset initial conditions include a gluing manner and initial glue; the modeling unit is used for modeling under the preset initial condition; the simulation unit is used for carrying out analog simulation; the simulation result acquisition unit is used for acquiring the intensity standard according to the simulation; and the selection unit is used for obtaining the selected glue according to the strength standard.
According to another aspect of the present invention, a testing tool is provided, which includes the glue optimization system as described above, and is configured to obtain the strength standard; and the testing device is used for testing the glue layer, wherein the testing device comprises the glue layer formed by the selected glue.
Preferably, the testing device further comprises a base; the battery cell is positioned on the base and is connected with the base through the adhesive layer; and the handle is connected with the battery cell and used for testing the adhesive layer, wherein the battery cell is pulled upwards through the handle so as to verify the strength of the adhesive layer in the normal direction.
Preferably, the testing device further comprises a base; the battery cell is positioned on the base and comprises a first battery cell and second battery cells positioned on two sides of the first battery cell; the first battery cell and the second battery cell are connected through the glue layer; the pressing plate is connected with the base and used for fixing the second battery cell, and the second battery cell is fixed on the base by the pressing plate; and the handle is connected with the first battery cell and used for testing the adhesive layer, wherein the first battery cell is pulled upwards through the handle so as to verify the strength of the adhesive layer in the tangential direction.
According to the glue optimization method and system for the battery module and the testing tool, the simulation method is used, the strength standard which the glue should meet is obtained according to the gluing mode and the initial glue, the selected glue is obtained according to the strength standard, the glue is suitable for various glue model selection, data support can be provided for the glue model selection, the glue model selection method and system can be generally used for glue with various complex structures, and structure optimization and model modification are rapidly carried out.
According to the glue optimization method and system for the battery module and the testing tool provided by the embodiment of the invention, the secondary development program is included, and the glue stress under various working conditions can be rapidly and accurately extracted.
According to the glue optimization method, the glue optimization system and the glue optimization testing tool for the battery module, the selected glue is obtained through simulation, and then the selected glue is tested at the level of parts, so that the time and the testing cost are saved, the glue can be quickly and accurately selected, the optimized design cost is reduced, and over-design is avoided.
According to the glue optimization method, the glue optimization system and the glue optimization testing tool for the battery module, simulation and entity testing are combined to form a closed loop, testing of parts can be directly carried out, testing of system level is not needed, and testing cost and testing time are reduced.
According to the glue optimization method and system for the battery module and the test tool, disclosed by the embodiment of the invention, the glue with low cost can be adopted to replace the previous glue with high cost through glue optimization and model selection, so that the cost is reduced to the maximum extent while the performance is met.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 shows a method flowchart of a glue optimization method for a battery module according to a first embodiment of the invention;
fig. 2 is a schematic structural view showing a battery pack according to a second embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a second adhesive layer according to an embodiment of the present invention;
FIG. 4 shows a simulation diagram according to a second embodiment of the invention;
fig. 5 is a flowchart illustrating a method of a glue optimization method for a battery module according to a third embodiment of the present invention;
fig. 6 is a block diagram illustrating a glue optimization system for a battery module according to a first embodiment of the present invention;
FIG. 7 shows a schematic structural diagram of a normal test module according to an embodiment of the present invention;
FIG. 8 shows a schematic structural diagram of a tangential test module according to an embodiment of the invention.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale. Moreover, certain well-known elements may not be shown in the figures.
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. In the following description, numerous specific details of the invention, such as structure, materials, dimensions, processing techniques and techniques of components, are set forth in order to provide a more thorough understanding of the invention. However, as will be understood by those skilled in the art, the present invention may be practiced without these specific details.
It will be understood that when a layer, region or layer is referred to as being "on" or "over" another layer, region or layer in describing the structure of the component, it can be directly on the other layer, region or layer or intervening layers or regions may also be present. Also, if the component is turned over, one layer or region may be "under" or "beneath" another layer or region.
Fig. 1 shows a flowchart of a method for optimizing glue used for a battery module according to a first embodiment of the invention. As shown in fig. 1, a glue optimization method for a battery module according to a first embodiment of the present invention includes the following steps:
step S101: presetting initial conditions, wherein the preset initial conditions comprise a gluing mode and initial glue.
Initial conditions are preset. The preset initial conditions comprise a gluing mode and initial glue. For example, the glue application method is set empirically. For example, based on experience, an initial glue is initially selected. The initial glue is for example the low halogen two-component methacrylate adhesive MA 805. According to the specification, the normal and tangential load capacity of the initial glue MA805 is about 13.8 MPa.
Step S102: modeling is performed under preset initial conditions.
Modeling is performed under preset initial conditions. For example, according to the above gluing mode, in the pre-processing of the CAE software, the initial glue is modeled to simulate the actual gluing area and thickness.
Step S103: and carrying out analog simulation.
And carrying out analog simulation. And carrying out analog simulation according to severe working conditions such as vibration, impact and the like. Optionally, 1 set of viscose units is designated, and simulation is performed in the case of 1 set of viscose units.
In an alternative embodiment of the present invention, a finite element model of the battery module is established for simulation. Optionally, a finite element model of the battery module is established in a three-dimensional cartesian coordinate system. Optionally, the battery module is divided by adopting hexahedral meshes when the finite element model is established. Optionally, according to an actual process, a connection relationship between the structures is established, including bonding, clamping, and the like.
In an alternative embodiment of the present invention, the glue optimizing method for a battery module further includes:
and constructing a virtual battery pack and/or a virtual battery module. For example, the virtual battery module is constructed according to the initial parameters of the virtual battery module. The virtual battery pack includes, for example, a battery case, and a battery module holder that are disposed inside the battery case.
Step S104: and extracting the stress in at least one direction, and obtaining the strength standard according to the stress and the safety factor.
And extracting the stress in at least one direction, and obtaining the strength standard according to the stress and the safety factor. Optionally, 1 set of viscose units is designated, and simulation is performed in the case of 1 set of viscose units. Writing 2 times of development program, and quickly extracting stress (such as S) of each unit in the set in each directionx、Sy、Sz) And averaging to obtain the stress of the viscose under the severe working condition. And obtaining the strength standard required to be met by the viscose glue by taking a proper safety factor. By comparing with the specification provided by the glue supplier, whether the glue water of the specification can meet the requirement or not and whether the reinforcement or cost reduction (cost reduction) is needed or not can be preliminarily determined. Optionally, according to the simulation result, the strength standards required to be met by the glue layer are normal 0.75Mpa and tangential 0.15 Mpa. Thus, MA805 belongs to over design and can reduce cost.
In an optional embodiment of the invention, a secondary development program is compiled, and the stress of each direction of the glue unit is quickly extracted to obtain the stress of the initial glue; and selecting a safety factor, and obtaining the strength standard according to the stress of the initial glue and the safety factor.
Step S105: the selected glue is obtained according to the strength standard.
The selected glue is obtained according to the strength standard. For example, according to the strength standard and the performance parameters of each glue, selecting a proper glue as the selected glue.
In an alternative embodiment of the invention, the selected glue is obtained according to a strength criterion. The selected glue meeting the strength criterion is obtained, for example, according to determined strength criteria, i.e. the normal and tangential stresses that need to be met.
In an alternative embodiment of the invention, when the performance parameter of the initial glue is below the strength criterion, a different type of glue than the initial glue is selected to reach the strength criterion.
In an alternative embodiment of the invention, when the performance parameter of the initial glue is higher than the strength criterion, a different type of glue than the initial glue is selected to reduce the glue cost.
In an alternative embodiment of the invention, the initial glue is selected as the selected glue when the performance parameters of the initial glue meet the strength criteria.
In an alternative embodiment of the present invention, the glue optimization method further comprises: obtaining the selected glue according to the strength standard; and performing analog simulation on the selected glue to verify the strength of the selected glue. Optionally, the strength standard that the glue needs to meet is obtained by modeling and simulating the initial glue. The selected glue is selected (obtained) according to the obtained strength criterion, i.e. the criterion that the selected glue needs to meet, e.g. according to a glue specification. And performing analog simulation on the selected glue, for example, performing analog simulation according to severe working conditions such as vibration, impact and the like, so as to verify the strength of the selected glue (verify whether the selected glue meets the strength standard or not, and whether the selected glue meets the design standard or not). Optionally, glue is selected as a battery module design criterion.
In an alternative embodiment of the present invention, the glue type is again selected to be two-component polyurethane. The test sample is made of the two-component polyurethane, and whether the test viscose can meet the strength standard or not is tested. If the strength criteria are not met, a higher performance glue is selected, or the glue pattern is re-optimized and the process is repeated (test specimens are made using the re-selected glue and tested).
It should be noted that, according to the glue optimization method for the battery module in the embodiment of the present invention, the related glue may be glue between the battery cells constituting the battery module, or glue at a connection between the battery module and another component (e.g., a case of a battery pack). The obtained strength standard can be the strength standard of glue among the battery cores forming the battery module, the strength standard of glue among the battery module and other components, or both.
Fig. 2 is a schematic structural diagram of a battery pack according to a second embodiment of the present invention. As shown in fig. 2, the battery pack 10 according to the second embodiment of the present invention includes a case 11 and a battery module 12. The battery module 12 includes a plurality of battery cells 121. Optionally, the battery cell 121 is adhered to the box 11. Glue is also applied between the battery cell 121 and the battery cell 121. Glue is coated between the bottom of the battery cell and the box body, and glue is coated between the battery cell and the battery cell.
Specifically, the case 11 is located at the bottom of the battery pack 10, and is used for mounting the battery module 12 (the battery cell 121).
The battery module 12 disposed on the box 11 includes a plurality of battery cells 121 for storing electric energy. Optionally, a plurality of battery cells 12 are distributed in an array on the box 11. Optionally, the battery cell 12 is a minimum unit of a power battery, and is also an electric energy storage unit.
In an alternative embodiment of the present invention, a row of battery cells 121 forms a battery module 12. For example, three battery modules 12 are shown in fig. 2. Optionally, one battery module 12 composed of a plurality of battery cells 121 is in contact with the outside as a whole.
It should be noted that the minimum unit for which the glue optimization method and system for a battery module according to the embodiment of the present invention is directed is not the battery pack as described above, but the battery module. Namely, the embodiment of the invention can optimize the glue among the battery cores in the battery module. Further, the embodiment of the invention can be optimized for glue between the battery module and other components in the battery pack.
Fig. 3 shows a schematic structural diagram of a glue layer according to a second embodiment of the invention. As shown in fig. 3, the adhesive layer 122 according to the second embodiment of the present invention includes a bottom adhesive layer 1221 and an inter-cell adhesive layer 1222. The glue used for the bottom glue layer 1221 and the inter-cell glue layer 1222 may be the same or different.
Specifically, the bottom adhesive layer 1221 is located at the bottom of the battery module 12 for adhesion between the case 11 and the battery module 12 (not shown in the drawings).
An inter-cell glue layer 1222 is disposed between the cells 12 (not shown in the figure) for bonding between the cells 12.
The shape and structure of the adhesive layer 122 have an influence on the performance of the adhesive, and determine the performance of the battery module and the battery pack to some extent. When the same glue is used for bonding the battery modules with different structures, the glue layers show different test results under the same test environment. According to the glue optimization method and system for the battery module, which are provided by the embodiment of the invention, the bottom glue layer 1221 can be independently optimized, the inter-cell glue layer 1222 can be independently optimized, and the bottom glue layer 1221 and the inter-cell glue layer 1222 can be simultaneously optimized.
A virtual battery pack (virtual battery module) is constructed according to the structure, size, etc. of the battery pack as shown in fig. 2. Optionally, the virtual battery module is constructed in analog simulation software.
And simulating vibration, impact, collision and the like of the virtual battery module. Fig. 4 shows a simulation diagram according to a second embodiment of the invention. Fig. 4 shows a simulation pattern of the glue layer according to the second embodiment of the invention. Taking the vibration working condition as an example, analog simulation is performed to obtain a calculation result. Simulation results show that under the vibration working condition, the stress on the joint of the bottom adhesive layer and the battery cell and the top of the adhesive layer between the battery cells and other positions is larger.
In an optional embodiment of the invention, after the simulation is finished, in order to determine the bearing capacity of each adhesive layer, a development program is written for 2 times, the program is led into simulation software, the stress of each unit of each adhesive layer is rapidly extracted, and the average stress is multiplied by the area of the adhesive layer, so that the bearing capacity of the adhesive layer can be obtained. The normal force and the tangential force can be respectively output according to the requirement. The specific formula is as follows:
wherein F represents the bearing capacity of the adhesive layer; siRepresenting the cell stress; n represents the number of cells; and A represents the glue line area.
According to the simulation result, the bearing capacity of the adhesive layer is converted into unit surface force of 0.75MPa in the normal direction and 0.15MPa in the tangential direction.
In an alternative embodiment of the present invention, the glue layer 122 includes a bottom glue layer 1221 and an inter-cell glue layer 1222. The adhesive layer 122 is divided into a plurality of sub-adhesive layers. The glue layer between adjacent cells is, for example, a sub-glue layer. After the simulation is finished, in order to determine the bearing capacity of each sub-adhesive layer, a development program is written for 2 times, the program is led into simulation software, the stress of each unit of each sub-adhesive layer is rapidly extracted, the average stress is carried out, and the average stress is multiplied by the area of the sub-adhesive layer, so that the bearing capacity of the sub-adhesive layer can be obtained.
In an alternative embodiment of the invention, a two-component methacrylate adhesive is used as an initial glue, bonding is performed according to the structure shown in fig. 2, and modeling and simulation are performed under the condition, so that the strength standard is obtained. According to the strength standard, the double-component methacrylate adhesive can be optimized into a double-component polyurethane adhesive, and the cost is reduced under the condition of meeting the strength requirement. Optionally, in order to further verify the reliability of the adhesive, a test sample is made using a two-component polyurethane adhesive to evaluate whether the requirements of normal stress (0.75Mpa) and tangential stress (0.15Mpa) can be met.
Fig. 5 is a flowchart illustrating a method for optimizing glue used for a battery module according to a third embodiment of the present invention. As shown in fig. 5, a glue optimizing method for a battery module according to a third embodiment of the present invention includes the steps of:
step S5001: designing a gluing mode;
and designing a gluing mode. For example, the adhesive means is designed according to the structure of the battery module.
Step S5002: simulation;
and (6) simulating. For example, simulation software is used for simulation.
Step S5003: establishing a finite element model;
and establishing a finite element model. For example, a finite element model of the battery module is established.
Step S5004: establishing a set;
a set is established. For example, 1 set of viscose units is designated.
Step S5005: simulating severe working conditions;
and (5) simulating severe working conditions. For example, simulations such as vibration, shock, and collision are performed.
Step S5006: obtaining a strength standard;
and obtaining the strength standard. And obtaining the strength standard which the adhesive layer should meet according to the simulation result. Optionally, the stress of the adhesive layer under the severe working condition is obtained according to simulation, and a proper safety factor is selected to obtain the strength standard required to be met by the adhesive layer.
In an alternative embodiment of the invention, the selected glue is obtained according to a strength criterion. The selected glue meeting the strength criterion is obtained, for example, according to determined strength criteria, i.e. the normal and tangential stresses that need to be met.
Step S5007: testing;
and (6) testing. The selected glue was tested. Optionally, the selected glue is tested for meeting the strength criterion.
Step S5008: manufacturing a test sample;
test samples were made. Optionally, a test sample of the entity is made.
Step S5009: simulating an actual state;
simulating the actual state. And simulating the actual state to test the test sample. For example to simulate the actual conditions under severe conditions.
Step S5010: extracting a tangential force limit;
the tangential force limit is extracted. And extracting the limit of the tangential force of the adhesive layer in the simulated actual state. The extracted tangential force limit is the tangential force at which the gel layer of the test sample fails in the tangential direction.
Step S5011: extracting a normal force limit;
the normal force limit is extracted. And extracting the normal force limit of the glue layer in the simulated actual state. The extracted normal force limit is the normal force at which the bond line of the test sample fails in the normal direction.
Step S5012: comparing the test result with the strength standard;
the test results were compared to intensity standards. Optionally, the test results of the test sample, i.e. the extracted tangential force limit and normal force limit, are compared to an intensity standard.
Step S5013: judging whether the requirements can be met;
and judging whether the requirements can be met. And judging whether the glue layer of the test sample meets the requirements or not according to the comparison result of the test result and the strength standard.
And when the requirement is judged not to be met, executing the step S5014 to optimize gluing. When the glue layer of the existing test sample is judged to be unable to meet the requirements (strength standard), the glue coating is optimized, for example, by reselecting the selected glue. Optionally, after optimizing the gluing, at least a part of the above steps is re-executed.
Upon determining that the requirement is satisfied, step S5015 is executed and ended. And when the adhesive layer of the existing test sample meets the requirement (strength standard), ending the simulation process.
Fig. 6 is a block diagram illustrating a glue optimization system for a battery module according to a first embodiment of the present invention. As shown in fig. 6, the glue optimization system for a battery module according to the first embodiment of the present invention includes a presetting unit 61, a modeling unit 62, a simulation unit 63, and a simulation result obtaining unit 64.
Specifically, a presetting unit 61 is provided for presetting initial conditions. The preset initial conditions comprise a gluing mode and initial glue.
And a modeling unit 62 for performing modeling under a preset initial condition.
And the simulation unit 63 is used for performing analog simulation.
And a simulation result obtaining unit 64 for obtaining the intensity standard according to the simulation. Optionally, the simulation result obtaining unit 64 extracts stress in at least one direction from the simulation, and obtains an intensity standard output according to the stress and the safety factor.
A selection unit 65 for obtaining the selected glue according to the strength criterion. Optionally, the selection unit 65 selects and determines the selected glue based on the strength criteria and the performance parameters of each type of glue.
In an alternative embodiment of the invention, the glue optimization system further comprises a verification unit. The verification unit is used for performing analog simulation on the selected glue to verify the strength of the selected glue.
In an alternative embodiment of the invention, the glue optimization system further comprises a building unit. The building unit is used for building the virtual battery module according to the initial parameters of the virtual battery module.
In an alternative embodiment of the invention, the simulation unit comprises a specification module. The designating module is used for designating the viscose units as a set and carrying out analog simulation under the condition that the viscose units are the set.
In an alternative embodiment of the invention, the simulation result obtaining unit comprises a processing module. The processing module is used for extracting the stress of the viscose unit in each direction to obtain the stress of the initial glue; and selecting a safety factor, and obtaining the strength standard according to the stress of the initial glue and the safety factor. Optionally, the processing module comprises a written (secondary) development program.
In an alternative embodiment of the present invention, the simulation result obtaining unit includes a tangential stress module and/or a normal stress module. The tangential stress module is used for acquiring the tangential stress of the initial glue (glue layer). The normal stress module is used for acquiring the normal stress of the initial glue (glue layer).
According to still another aspect of the present invention, a test fixture is provided. The test tool comprises the glue optimization system and the test device. The glue optimization system is used to obtain the strength criteria. The testing device is used for testing the adhesive layer. The selected glue is obtained according to the strength standard. The testing device includes a glue layer formed by the selected glue. Optionally, the glue is selected according to a strength criterion obtained by the glue optimization system. A test device was made using the selected glue to test the selected glue (the glue line formed).
In an alternative embodiment of the invention, the test device comprises a normal test module and a tangential test module.
In an alternative embodiment of the present invention, the testing device includes a glue layer formed by selected glue, a base, a battery cell and a handle. The battery cell is positioned on the base and is connected with the base through a glue layer. The handle is connected with the battery core and used for testing the adhesive layer. The battery cell is pulled upwards through the handle, so that the strength of the adhesive layer in the normal direction is verified.
In an alternative embodiment of the present invention, the testing device includes a glue layer formed by selected glue, a base, a cell, a pressing plate, and a handle. The battery cell includes a first battery cell and a second battery cell. The battery cell is located on the base. The battery cell comprises a first battery cell and second battery cells positioned on two sides of the first battery cell. The first battery cell and the second battery cell are connected through a glue layer. The pressing plate is connected with the base and used for fixing the second battery cell, and the second battery cell is fixed on the base by the pressing plate. The handle is connected with the first battery cell and used for testing the adhesive layer. The first battery cell is pulled upwards through the handle, so that the strength of the adhesive layer in the tangential direction is verified.
FIG. 7 shows a schematic structural diagram of a normal test module according to an embodiment of the present invention. As shown in fig. 7, the normal test module according to the embodiment of the present invention includes a base 21, a battery cell 121, and a pull handle 23.
Specifically, the battery cell 121 is located on the base 21. The bottom of the cell 121 is glued to the base 21 with glue (selected glue to be tested).
The handle 23 is connected with the battery cell 121 and used for testing glue. The cell 121 was pulled up with the pull handle 23 to verify the strength of the adhesive (in the normal direction). Optionally, the pulling device is used to pull the handle 23 and obtain the magnitude of the pulling force. And applying the maximum normal force meeting the strength standard, and verifying the strength of the adhesive according to whether the adhesive layer fails or not. Optionally, the pulling device is used to pull the handle 23 and obtain the amount of traction when the glue layer fails. The strength of the adhesive is verified by comparing the traction force when the adhesive layer fails with the strength standard. Optionally, the handle 23 is disposed on top of the battery cell 121.
FIG. 8 shows a schematic structural diagram of a tangential test module according to an embodiment of the invention. As shown in fig. 8, the tangential testing module according to the embodiment of the present invention includes a base 21, a pressing plate 22, a handle 23, and a battery cell 121. The battery cell 121 includes a first battery cell 1211 and a second battery cell 1212.
Specifically, the battery cell 121 is located on the base 21. The cell 121 includes a first cell 1211 and second cells 1212 on opposite sides of the first cell 1211. Glue is applied between the first cell 1211 and the second cell 1212.
The pressing plate 22 is connected to the base 21 for fixing the second cell 1212. The second cells 1212 on both sides of the first cell 1211 are fixed to the base 21 by the pressing plate 22.
The pull 23 is connected to the first cell 1211 for testing the glue. The first cell 1211 is pulled up with the handle 23 to verify the strength of the glue (in tangential direction). When the first cell 1211 is pulled upward, the second cell 1212 is fixed to the base 21 by the pressing plate 22.
Optionally, the pulling device is used to pull the handle 23 and obtain the magnitude of the pulling force. The maximum tangential force (the force that pulls upward and acts between the first cell 1211 and the second cell 1212) that meets the strength criteria is applied to verify the strength of the adhesive based on whether the adhesive layer has failed. Optionally, the pulling device is used to pull the handle 23, and obtain the magnitude of the tangential force between the first cell 1211 and the second cell 1212 when the glue layer fails. The strength of the adhesive is verified by comparing the tangential force when the adhesive layer fails with the strength standard. Optionally, the handle 23 is disposed on top of the battery cell 121.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
While embodiments in accordance with the invention have been described above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A glue optimization method for a battery module, the glue being used for bonding the battery module, the glue optimization method comprising:
presetting initial conditions, wherein the preset initial conditions comprise a gluing mode and initial glue;
modeling under the preset initial condition;
carrying out analog simulation;
extracting stress in at least one direction, and obtaining a strength standard according to the stress and the safety coefficient; and
and obtaining the selected glue according to the strength standard.
2. The glue optimization method for battery modules according to claim 1, wherein the obtaining of the selected glue according to the strength criteria comprises:
selecting a glue of a different type than the initial glue to meet the strength criterion when the performance parameter of the initial glue is below the strength criterion.
3. The glue optimization method for battery modules according to claim 1, wherein the obtaining of the selected glue according to the strength criteria comprises:
when the performance parameter of the initial glue is higher than the strength standard, selecting a different type of glue than the initial glue to reduce glue costs.
4. The glue optimization method for a battery module according to claim 1, further comprising:
constructing a virtual battery module according to the initial parameters of the virtual battery module; and
performing analog simulation on the virtual battery module according to the severe working conditions,
wherein the severe working condition comprises at least one of vibration, impact and collision.
5. The glue optimization method for the battery module according to claim 1, wherein the performing of the simulation includes:
and designating the viscose units as a set, and performing analog simulation under the condition that the viscose units are the set.
6. The glue optimization method for the battery module according to claim 5, wherein the extracting stress in at least one direction, and obtaining the strength standard according to the stress and the safety factor comprises:
writing a secondary development program, and quickly extracting the stress of the adhesive unit in each direction to obtain the stress of the initial adhesive; and
and selecting a safety factor, and obtaining the strength standard according to the stress of the initial glue and the safety factor.
7. A glue optimization system for a battery module, comprising:
the device comprises a presetting unit, a processing unit and a control unit, wherein the presetting unit is used for presetting initial conditions, and the preset initial conditions comprise a gluing mode and initial glue;
the modeling unit is used for modeling under the preset initial condition;
the simulation unit is used for carrying out analog simulation;
the simulation result acquisition unit is used for acquiring the intensity standard according to the simulation; and
and the selecting unit is used for obtaining the selected glue according to the strength standard.
8. The utility model provides a test fixture which characterized in that includes:
the glue optimization system of claim 7, configured to obtain the strength criteria; and
the testing device is used for testing the adhesive layer,
wherein the testing device comprises the glue layer formed by the selected glue.
9. The test tool of claim 8, wherein the testing device further comprises:
a base;
the battery cell is positioned on the base and is connected with the base through the adhesive layer; and
a handle connected with the battery core and used for testing the adhesive layer,
and the battery cell is pulled upwards through the handle so as to verify the strength of the adhesive layer in the normal direction.
10. The test tool of claim 8, wherein the testing device further comprises:
a base;
the battery cell is positioned on the base and comprises a first battery cell and second battery cells positioned on two sides of the first battery cell; the first battery cell and the second battery cell are connected through the glue layer;
the pressing plate is connected with the base and used for fixing the second battery cell, and the second battery cell is fixed on the base by the pressing plate; and
a handle connected with the first battery cell and used for testing the adhesive layer,
and the first battery cell is pulled upwards through the handle so as to verify the strength of the adhesive layer in the tangential direction.
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