CN113514215A - Design method of vibration clamp of lithium battery plug box based on CAE - Google Patents
Design method of vibration clamp of lithium battery plug box based on CAE Download PDFInfo
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- CN113514215A CN113514215A CN202110590989.6A CN202110590989A CN113514215A CN 113514215 A CN113514215 A CN 113514215A CN 202110590989 A CN202110590989 A CN 202110590989A CN 113514215 A CN113514215 A CN 113514215A
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 62
- 238000013461 design Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000012360 testing method Methods 0.000 claims abstract description 79
- 230000003014 reinforcing effect Effects 0.000 claims description 10
- 238000004458 analytical method Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000004364 calculation method Methods 0.000 description 4
- 238000012938 design process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000012916 structural analysis Methods 0.000 description 2
- 238000004590 computer program Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/027—Specimen mounting arrangements, e.g. table head adapters
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Abstract
A design method of a vibration clamp of a lithium battery plug box based on CAE comprises the following steps: a: providing an initialization setting module; b, providing preprocessing software, and importing the structural data of the vibration clamp into the preprocessing software of the CAE; c: providing a solver, and solving the first-order natural frequency of the vibration clamp; d, providing a comparison module; f: when the test frequency is smaller than the target natural frequency value, increasing the thickness of the L-shaped top plate; when the test frequency is smaller than the target value of the natural frequency, increasing the number of fasteners and repeating the steps B to D; and J, when the test frequency is greater than or equal to the target natural frequency value, the vibration clamp is considered to meet the requirement. The design method can not only achieve the purpose quickly, but also use the fasteners with the most appropriate number to reduce the weight of the whole vibration clamp, prolong the test life of the vibration clamp and reduce the influence of the vibration clamp on the vibration test of the lithium battery plug box.
Description
Technical Field
The invention relates to the technical field of lithium battery manufacturing, in particular to a design method of a vibration clamp of a lithium battery plug box based on CAE.
Background
As is known, a vibration test refers to a test performed to assess the resistance of a product to vibration in the intended environment of use. The clamp of the tested product is a link which must be considered in the preparation process before the test, the clamp is a transition piece for connection or switching, and the quality of the clamp directly influences the quality of the test.
For the vibration test of the lithium battery plug box, the traditional design process is that a structural engineer determines the shape, thickness, fixing mode and position, size of a connecting hole and the like of a vibration clamp according to the actual installation condition of the lithium battery plug box and the specification of a vibration table and combined experience. Then manufacturing a clamp and completing the vibration test of the lithium battery plug box.
However, the design of the lithium battery vibration clamp in the prior art is reasonable, the clamp itself is not subjected to vibration test, and whether the dynamic rigidity and the structural strength meet the test requirements is not known. If the design of the vibration clamp is unreasonable, the test specimen is easily influenced by the clamp, and the vibration test result is distorted.
Disclosure of Invention
In view of this, the invention provides a design method of a vibration clamp of a lithium battery plug box based on CAE, so as to ensure the design rationality of the vibration clamp.
The utility model provides a design method of vibration anchor clamps of lithium cell subrack based on CAE, vibration anchor clamps include a shaking table, four settings are in on the shaking table and be located respectively the L shape roof all around of lithium cell subrack, a plane clamp plate of setting on two L shape roofs that set up relatively to and a plurality of fasteners that are used for fixing respectively L shape roof and shaking table, the design method of vibration anchor clamps of lithium cell subrack based on CAE includes following step:
a: providing an initialization setting module, wherein the initialization setting module is used for setting the thickness of the L-shaped top plate and a target value of the natural frequency of the vibration clamp;
providing preprocessing software, importing the structural data of the vibration clamp into the preprocessing software of the CAE to perform grid division, material and attribute endowment and boundary condition loading on the vibration clamp;
c: providing a solver, and solving the first-order natural frequency of the vibration clamp to obtain the test frequency of the vibration clamp;
providing a comparison module, wherein the comparison module is used for comparing the test frequency of the vibration clamp with the target value of the natural frequency;
when the test frequency is greater than or equal to the target value of the natural frequency, the vibration clamp is considered to meet the requirement;
f: when the test frequency is smaller than the target natural frequency value, increasing the thickness of the L-shaped top plate;
g: repeating steps B to F once;
h: when the test frequency is greater than or equal to the target value of the natural frequency, the vibration clamp is considered to meet the requirement;
when the test frequency is smaller than the target value of the natural frequency, increasing the number of fasteners of the L-shaped top plate and the vibrating table, and repeating the steps B to D;
and J, when the test frequency is greater than or equal to the target natural frequency value, the vibration clamp is considered to be in accordance with the requirement, and when the test frequency is less than the target natural frequency value, the steps B to C and H are repeated until the test frequency is greater than or equal to the target natural frequency value.
Further, the solver is a finite element structure analysis solver.
Further, the L-shaped top plate comprises a first plate fixedly arranged on the vibration table, a second plate fixedly connected with the first plate and abutted against the lithium battery plug box, and a plurality of rows of fastener through grooves formed in the first plate.
Further, the extending direction of the fastener through groove is parallel to the arrangement direction of the two oppositely arranged L-shaped top plates.
Furthermore, the L-shaped top plate also comprises a reinforcing rib arranged between the first plate and the second plate, and the fastener through grooves are provided with two rows and are respectively and symmetrically arranged at two sides of the reinforcing rib.
Further, the reinforcing rib is located at the center line of the first plate.
Further, in step F, the thickness of the L-shaped top plate is increased only once.
Further, step F is performed at least once before the test frequency is less than the target value of the natural frequency.
Further, the test frequency is a first order natural frequency of the vibrating fixture.
Further, when the first-order natural frequency is larger than the maximum value of the vibration test frequency of the lithium battery plug box, the vibration clamp meets the requirements of a vibration test.
Compared with the prior art, the design method of the vibration fixture of the CAE-based lithium battery plug-in box, provided by the invention, introduces CAE structural analysis in the design process of the fixture, establishes a virtual prototype of the fixture on a computer, and obtains the mechanical property of the vibration fixture by using the strong numerical calculation capability of the CAE, so that the first-order natural frequency of the vibration fixture can be obtained as soon as possible, whether the vibration fixture meets the requirements or not is quickly judged, if not, the thickness of the L-shaped top plate of the vibration fixture is increased, and the thickness of the L-shaped top plate is increased to the maximum value at one time, and then the test is carried out. If the first-order natural frequency of the vibration clamp is not satisfactory, the number of the fasteners is increased, the number of the fasteners can be increased for multiple times, namely, the fasteners are repeated for multiple times, the number of the fasteners is increased for multiple times until the first-order natural frequency of the vibration clamp meets the requirements, the purpose can be quickly achieved, the fasteners with the most proper number are used, the weight of the whole vibration clamp is reduced, the test life of the vibration clamp is prolonged, and meanwhile, the influence of the vibration clamp on the vibration test of the lithium battery plug box is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a vibration fixture used in a design method of a vibration fixture of a CAE-based lithium battery subrack provided by the present invention.
Fig. 2 is a flowchart of a design method of the vibration jig of the CAE-based lithium battery compartment of fig. 1.
Detailed Description
Specific examples of the present invention will be described in further detail below. It should be understood that the description herein of embodiments of the invention is not intended to limit the scope of the invention.
As shown in fig. 1, the structural diagram of the vibration fixture used in the design method of the CAE-based vibration fixture for the lithium battery plug box provided by the present invention is shown. The vibration fixture is used for clamping and fixing a lithium battery plug box 10 for vibration test. The lithium battery box 10 itself is prior art and includes an outer frame and a lithium battery pack disposed in the outer frame. The lithium battery box 10 is not an innovative point of the present invention and will not be described in detail herein. When the lithium battery plug-in box 10 is subjected to vibration test, the vibration test frequency range is 5 Hz-200 Hz, so that the first-order natural frequency of the vibration clamp is required to be greater than 200Hz, and the vibration clamp can not resonate with the lithium battery plug-in box 10, so that the test value of the vibration test is seriously distorted. In addition, the first natural frequency of the vibration jig may not be less than 5Hz, because if the first natural frequency of the vibration jig is less than 5Hz, the second natural frequency and the third natural frequency may reach between 5Hz and 200Hz, so that the vibration jig resonates with the battery box 10. The vibration fixture comprises a vibration table 20 arranged on a vibration testing machine, four vibration tables 20 arranged on the vibration testing machine and respectively located on the L-shaped top plates 21 on the periphery of the lithium battery plug box 10, and a plane pressing plate 22 arranged on the two L-shaped top plates 21 which are oppositely arranged. The vibration table 20 has a planar structure. For the purpose of improving the accuracy of the vibration test, the accuracy of the flatness of the table top of the vibration table 20 should be high. The L-shaped top plate 21 includes a first plate 211 fixedly disposed on the vibration table 20, a second plate 212 fixedly connected to the first plate 211 and abutting against the lithium battery compartment 10, a rib 213 disposed between the first plate 211 and the second plate 212, a plurality of rows of fastener passing grooves 214 disposed on the first plate 211, and a plurality of fasteners 215 respectively passing through the fastener passing grooves 214 and fixed on the vibration table 20. The first and second plates 211, 212 are both flat plate structures, and the flatness of their contact surfaces with the lithium battery box 10 and the vibration table 20 should also be high to improve the test accuracy. The four L-shaped top plates 21 should be symmetrically arranged so as to be balanced with each other in all directions when vibrated. The reinforcing ribs 213 are disposed on the middle lines of the first and second plates 211, 212 to achieve the purpose of symmetrical arrangement. The multiple rows of the fastener through grooves 214 are distributed on two sides of the reinforcing rib 213 and are symmetrically distributed. The extending direction of the fastener through groove 214 is parallel to the arrangement direction of the two oppositely arranged L-shaped top plates 21, so that the mass of the vibration table 20 is symmetrically distributed. The fastening member 215 is used to fix the second plate 212 to the vibration table 20. The fasteners 215 are preferably bolted in order to secure the mounting of the entire vibration jig. The planar pressing plates 22 are disposed on the two oppositely disposed L-shaped top plates 21 to press the lithium battery box 10, thereby fixing the lithium battery box 10.
After the lithium battery plug box 10 is clamped, whether the first-order natural frequency of the vibration clamp meets the requirement or not can be tested, so that the vibration clamp is optimized, and the first-order natural frequency of the vibration clamp is larger than the maximum vibration test frequency of the lithium battery plug box 10. In this embodiment, the first-order natural frequency of the vibration fixture should be greater than 200Hz to avoid the vibration fixture from resonating with the lithium battery box. The design of the vibration jig is based on cae (computer Aided engineering), i.e., computer Aided design software. As shown in fig. 2, the design method of the vibration clamp of the CAE-based lithium battery plug box includes the following steps:
a: providing an initialization setting module 30, wherein the initialization setting module 30 is used for setting the thickness of the L-shaped top plate 21 and the target value of the natural frequency of the vibration clamp;
providing preprocessing software, importing the structural data of the vibration clamp into the preprocessing software of the CAE to perform grid division, material and attribute endowment and boundary condition loading on the vibration clamp;
c: providing a solver, and solving the first-order natural frequency of the vibration clamp to obtain the test frequency of the vibration clamp;
providing a comparison module 40, wherein the comparison module 40 is used for comparing the test frequency of the vibration clamp with the target value of the natural frequency;
when the test frequency is greater than or equal to the target value of the natural frequency, the vibration clamp is considered to meet the requirement;
f: increasing the thickness of the L-shaped top plate when the test frequency is less than the target natural frequency value
G: repeating steps B to F once;
h, when the test frequency is greater than or equal to the target value of the natural frequency, the vibration clamp is considered to meet the requirement;
i: when the test frequency is smaller than the target value of the natural frequency, increasing the number of fasteners of the L-shaped top plate and the vibrating table, and repeating the steps B to D;
and J, when the test frequency is greater than or equal to the target natural frequency value, the vibration clamp is considered to be in accordance with the requirement, and when the test frequency is less than the target natural frequency value, the steps B to C and H are repeated until the test frequency is greater than or equal to the target natural frequency value.
In step a, the initialization setting module 10 may be a functional module in a computer program, which is used to set the thickness of the L-shaped top plate 21 and the target value of the natural frequency of the vibration jig according to actual needs. The initialization setup module 10 can interact with the user, i.e. can be freely selected by the user depending on the actual situation. The first and second plates 211, 212 of the L-shaped top plate 21, and the reinforcing ribs 213 may be arbitrarily set, that is, the thickness thereof is set by CAE software. The target natural frequency of the vibration jig should be a property inherent to the vibration jig, that is, the natural frequency of the vibration jig should be identical when the vibration frequency of the vibration test stand is constant, for example, a bridge, the vibration frequency of which is identical, and resonance is formed only when the frequency of external excitation such as marching is identical to the vibration frequency of the bridge. As mentioned above, the target natural frequency should be greater than the maximum vibration test frequency of the lithium battery box 10 to ensure that the frequency of the vibration fixture, no matter the order of several orders, will be greater than the maximum vibration test frequency of the lithium battery box 10, so as to avoid the designed vibration fixture from resonating with the lithium battery box 10.
In step B, a three-dimensional module of the vibration jig is set up by three-dimensional design software such as solidwork, etc., and the structural form, material thickness, size and position of the fastener slot 214, grid division, material and attribute assignment, loading of boundary conditions, etc. of the vibration jig are determined. Meanwhile, the characteristics are digitalized through the three-dimensional design software, so that the subsequent analysis and calculation are facilitated.
In step C, the solver is also executed by an existing software, which may be a finite element structure analysis solver, such as ABAQUS, ANSYS, MSC, etc. The finite element structure analysis solver is an existing software, and can solve and obtain certain parameters according to the needs of a user, such as continuity problems of heat conduction, electromagnetic field, hydromechanics and the like, and certainly also comprises the calculation of vibration frequency. It will be appreciated that how to solve for the vibration frequency using these software is a prior art and will not be described in detail herein.
In step D, the comparison module 20 compares the test frequency of the vibration fixture with the target natural frequency value, so as to know whether the first-order natural frequency of the vibration fixture meets the requirement.
In the step E, when the test frequency is greater than or equal to the target natural frequency value, the vibration clamp is considered to meet the requirement, so that the vibration clamp can be used for clamping the lithium battery plug box to perform the vibration test of the lithium battery plug box.
In step F, when the test frequency is less than the target value of the natural frequency, the first-order natural frequency of the vibration fixture is considered to be less than the maximum vibration test frequency of the lithium battery plug box 10, and in the use process of the vibration fixture, the vibration frequency of the vibration fixture is inevitably equal to or close to the vibration frequency of the lithium battery plug box 10 at a certain time, so that resonance occurs, and the vibration test result of the lithium battery plug box 10 is further influenced. When the first-order natural frequency of the vibration jig is less than the maximum vibration test frequency of the lithium battery box 10, the thicknesses of the first and second plates 211 and 212 and the reinforcing ribs 213 of the L-shaped top plate 21 need to be increased to increase the rigidity of the L-shaped top plate 21. However, no matter how much the thickness of the L-shaped top plate 21 is increased, the first-order natural frequency of the vibration jig is often or cannot be determined due to the characteristics of the vibration jig itself. Therefore, the thickness of the L-shaped top plate 21 tends to increase to a maximum value here. And then repeating the steps B to F once again to detect whether the thickness of the vibration clamp after being increased meets the requirement.
In step G, after repeating steps B to F, if the test frequency is greater than or equal to the target natural frequency value, the vibration fixture is considered to meet the requirements, and at the moment, the vibration fixture can be used for clamping the lithium battery plug box to perform the vibration test of the lithium battery plug box.
In step H, when the test frequency is less than the target natural frequency, the number of the fasteners 214 of the L-shaped top plate 21 and the vibration table 20 is increased to increase the strength of the L-shaped top plate 21 and the vibration table 20. The first-order natural frequency of the vibration jig can be further increased by increasing the number of the fastening members 214 to increase the strength of the L-shaped top plate 21 and the vibration table 20. And then repeating the steps B to D until the first-order natural frequency of the vibration clamp is larger than the target natural frequency value. Of course, when the fastening member 214 is added, it should be added symmetrically for each L-shaped top plate 21, and should not be added for only one L-shaped top plate 21.
Compared with the prior art, the design method of the vibration clamp of the CAE-based lithium battery plug-in box introduces CAE structural analysis in the clamp design process, establishes a virtual prototype of the clamp on a computer, and obtains the mechanical property of the vibration clamp by using the strong numerical calculation capability of the CAE, so that the first-order natural frequency of the vibration clamp can be obtained as soon as possible, whether the vibration clamp meets the requirements or not can be judged quickly, if not, the thickness of the L-shaped top plate 21 of the vibration clamp is increased, the thickness of the L-shaped top plate 21 is increased to the maximum value at one time, and then the test is carried out. If the first-order natural frequency of the vibration clamp is not satisfactory, the number of the fastening pieces 214 is increased, and the number of the fastening pieces 214 can be increased for multiple times, namely repeated for multiple times, and the number of the fastening pieces 214 is increased for multiple times until the first-order natural frequency of the vibration clamp is satisfactory, so that the purpose can be quickly achieved, the most appropriate number of the fastening pieces 214 are used, the weight of the whole vibration clamp is reduced, the test life of the vibration clamp is prolonged, and meanwhile, the influence of the vibration clamp on the vibration test of the lithium battery plug box 10 is reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, and any modifications, equivalents or improvements that are within the spirit of the present invention are intended to be covered by the following claims.
Claims (10)
1. The utility model provides a design method of vibration anchor clamps of lithium cell subrack based on CAE, vibration anchor clamps include a shaking table, four are set up on the shaking table and are located respectively the L shape roof all around of lithium cell subrack, a plane clamp plate of setting on two L shape roofs that set up relatively to and a plurality of fasteners that are used for fixing respectively L shape roof and shaking table, it includes following step:
a: providing an initialization setting module, wherein the initialization setting module is used for setting the thickness of the L-shaped top plate and a target value of the natural frequency of the vibration clamp;
providing preprocessing software, importing the structural data of the vibration clamp into the preprocessing software of the CAE to perform grid division, material and attribute endowment and boundary condition loading on the vibration clamp;
c: providing a solver, and solving the first-order natural frequency of the vibration clamp to obtain the test frequency of the vibration clamp;
providing a comparison module, wherein the comparison module is used for comparing the test frequency of the vibration clamp with the target value of the natural frequency;
when the test frequency is greater than or equal to the target value of the natural frequency, the vibration clamp is considered to meet the requirement;
f: when the test frequency is smaller than the target natural frequency value, increasing the thickness of the L-shaped top plate;
g: repeating steps B to F once;
h: when the test frequency is greater than or equal to the target value of the natural frequency, the vibration clamp is considered to meet the requirement;
when the test frequency is smaller than the target value of the natural frequency, increasing the number of fasteners of the L-shaped top plate and the vibrating table, and repeating the steps B to D;
and J, when the test frequency is greater than or equal to the target natural frequency value, the vibration clamp is considered to be in accordance with the requirement, and when the test frequency is less than the target natural frequency value, the steps B to C and H are repeated until the test frequency is greater than or equal to the target natural frequency value.
2. The design method of the vibration clamp of the CAE-based lithium battery plug-in box of claim 1, characterized in that: the solver is a finite element structure analysis solver.
3. The design method of the vibration clamp of the CAE-based lithium battery plug-in box of claim 1, characterized in that: the L-shaped top plate comprises a first plate fixedly arranged on the vibration table, a second plate fixedly connected with the first plate and abutted against the lithium battery plug box, and a plurality of rows of fastener through grooves formed in the first plate.
4. The design method of the vibration clamp of the CAE-based lithium battery plug-in box of claim 3, characterized in that: the extending direction of the fastener through groove is parallel to the arrangement direction of the two oppositely arranged L-shaped top plates.
5. The design method of the vibration clamp of the CAE-based lithium battery plug-in box of claim 3, characterized in that: the L-shaped top plate further comprises a reinforcing rib arranged between the first plate and the second plate, and the fastener penetrating grooves are provided with two rows and are symmetrically arranged on two sides of the reinforcing rib respectively.
6. The design method of the vibration clamp of the CAE-based lithium battery plug-in box of claim 3, characterized in that: the reinforcing ribs are located at the center line of the first plate.
7. The design method of the vibration clamp of the CAE-based lithium battery plug-in box of claim 1, characterized in that: in step F, the thickness of the L-shaped top plate is increased only once.
8. The design method of the vibration clamp of the CAE-based lithium battery plug-in box of claim 1, characterized in that: step H is performed at least once before the test frequency is less than the target value of the natural frequency.
9. The design method of the vibration clamp of the CAE-based lithium battery plug-in box of claim 1, characterized in that: the test frequency is a first order natural frequency of the vibrating fixture.
10. The design method of the vibration clamp of the CAE-based lithium battery plug-in box of claim 1, characterized in that: when the first-order natural frequency is larger than the maximum value of the vibration test frequency of the lithium battery plug box, the vibration clamp meets the requirement of a vibration test.
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