CN109458974B - Device and method for measuring maximum deformation of side column collision power battery and power battery - Google Patents
Device and method for measuring maximum deformation of side column collision power battery and power battery Download PDFInfo
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- CN109458974B CN109458974B CN201811480131.9A CN201811480131A CN109458974B CN 109458974 B CN109458974 B CN 109458974B CN 201811480131 A CN201811480131 A CN 201811480131A CN 109458974 B CN109458974 B CN 109458974B
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- 238000000034 method Methods 0.000 title claims description 20
- 239000000463 material Substances 0.000 claims abstract description 23
- 239000000498 cooling water Substances 0.000 claims description 19
- 238000005452 bending Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 238000010030 laminating Methods 0.000 claims 8
- 238000012360 testing method Methods 0.000 abstract description 13
- 238000004088 simulation Methods 0.000 description 6
- 238000010079 rubber tapping Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011076 safety test Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
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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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
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Abstract
The invention provides a measuring device for the maximum deformation of a side column collision power battery, which is fixed between a power battery shell and a battery module, wherein the measuring device is at least partially attached to the inner side wall of the power battery shell, and the material of the measuring device has the characteristics of more than 30 percent of elongation and 20-60 MPa of material strength; and taking the deformation of the measuring device after the side column collision occurs as the maximum deformation of the power battery shell. After the power battery with the measuring device is subjected to side column collision, the maximum deformation of the power battery shell can be reserved through the measuring device, standard CAE analysis is facilitated, accurate data of a real vehicle test are obtained, and the accurate data are used as data in the field of automobile safety.
Description
Technical Field
The invention relates to the field of automobile safety, in particular to a device for measuring the deformation of a power battery under the condition of automobile side column collision.
Background
C-NCAP is a new vehicle evaluation program in China, namely ChinaNew CarAssessmentProgramme, and the evaluation of the side column collision of the vehicle is not considered at present. However, the european new vehicle assessment program E-NCAP has considered this condition, specifically, a side pillar bump schematic as shown in fig. 1, that is, a pillar on one side of the vehicle hits the vehicle along an angle of 75 ° with respect to the longitudinal center of the vehicle, and the hit position is aligned with the centroid of the human head a.
When a side pillar collision occurs, the side body structure of the vehicle is allowed to deform to a certain extent under normal conditions, otherwise collision energy cannot be fully absorbed to achieve the aim of reducing human injury.
On the other hand, when the side of the vehicle body is greatly deformed and invaded, the power battery is deformed, the inner walls 22 (shown in fig. 4) on the two sides of the lower shell of the power battery rotate along the arrow direction in fig. 6 after being extruded, so that the gap between the inner wall 22 of the lower shell and the power battery module 3 is reduced, and the cooling water pipe 4 is not broken and leaked as long as the gap after being extruded and deformed is sufficient. The risk is usually confirmed by CAE simulation analysis means in the design process of the vehicle, because deformation conditions of the vehicle body structure, the power battery pack and the internal structure thereof can be clearly observed from simulation animation during CAE simulation analysis. But how to verify the vehicle side pillar bump is verified by a vehicle side pillar bump test.
The measurement of the maximum deformation value is beneficial to CAE simulation analysis calibration, and can reflect the risk of squeezing the cooling water pipe in actual collision. The conventional method for measuring the actual automobile test process of the traditional automobile comprises the following steps of: 1. filling a gap between two tested pieces in a certain shape through plasticine; 2. the piece is brushed with the oil color and the other piece is stuck with a thin sheet (such as paper, etc.) which is easy to stick with the oil color.
The 2 methods described above have the following design drawbacks:
The design method for filling the plasticine has the following defects: the plasticine is softer, and is easy to shake and deform in the process of carrying the collision vehicle after the test, so that the measured value is inaccurate.
The mode of brushing oil color has the defects that: only whether two adjacent pieces are touched or not can be detected but the maximum deformation amount cannot be detected.
Therefore, in the side column crash test of the prior art, there is no method capable of measuring the maximum deformation amount of the power battery.
Disclosure of Invention
The invention aims to provide a device and a method for measuring the maximum deformation of a power battery by side column collision and the power battery, which are used for solving the technical problem that the maximum deformation of the power battery cannot be accurately measured in the traditional automobile test.
In order to achieve the above purpose, the present invention proposes the following technical scheme:
The measuring device is at least partially attached to the inner side wall of the power battery shell, and the material of the measuring device has the characteristics of more than 30 percent of elongation and 20-60 MPa of material strength; and taking the deformation of the measuring device after the side column collision occurs as the maximum deformation of the power battery shell.
Further, in the method, the end portion, the attaching portion and the connecting portion are disposed on the measuring device, the attaching portion is connected with the end portion through the connecting portion, bending is formed between the connecting portion and the attaching portion so that the two end portions are located on the same side of the attaching portion, the attaching portion is attached to the inner side wall of the lower power battery shell, and the end portion is fixed to a portion other than the inner side wall of the lower power battery shell.
Further, in the above method, the two end portions are arranged in the up-down direction, wherein the connection portion corresponding to the upper end portion is located above and is placed on the cooling water pipe inside the power cell case.
Based on the method, the invention provides a measuring device for the maximum deformation of a side column collision power battery, wherein the material of the measuring device has the characteristics of more than 30 percent of elongation and 20-60 MPa of material strength; the measuring device comprises an end part, a fitting part and a connecting part, wherein the fitting part is connected with the end part through the connecting part, bending is formed between the connecting part and the fitting part so that the two end parts are located on the same side of the fitting part, the fitting part is matched with the inner side wall of the power battery shell, and the end part is used as a fixed end to fix the measuring device in the power battery shell.
The measuring device is arranged inside the power battery shell to form a power battery, the measuring device is fixed between the power battery shell and the battery module, two end parts of the measuring device are arranged in the vertical direction, and a connecting part corresponding to the upper end part is arranged above a cooling water pipe inside the power battery shell and is arranged on the cooling water pipe.
Specifically, in the invention, the attaching part of the measuring device is attached to the inner side wall of the lower shell of the power battery shell, and the upper end of the attaching part does not exceed the matching surface of the upper shell and the lower shell of the power battery.
Further, in the invention, the upper end part of the measuring device is fixed on the power battery module, and the lower end part of the measuring device is fixed on the bottom plate of the lower shell of the power battery.
The beneficial effects are that:
According to the technical scheme, the invention provides a device and a method for measuring the maximum deformation of a side column collision power battery and the power battery. The measuring device is made of materials with high elongation and small rebound, is installed and fixed between the power battery shell and the battery module, and utilizes the part of the measuring device, which is attached to the lower shell of the power battery, to present the maximum deformation position of the power battery after the power battery is bumped by the side column, so that the maximum deformation is reserved in the real vehicle test.
The materials of the measuring device meeting the requirements are very common in the market, such as lead strips (commonly used for fishing weights) and aluminum strips or tin strips can be used, so that the scheme is easy to realize and low in cost.
When the device and the method are used for carrying out the real vehicle test, the measured maximum deformation is equivalent to the CAE simulation effect, the accuracy is high, and the device and the method can be used as effective parameters in the field of collision safety.
It should be understood that all combinations of the foregoing concepts, as well as additional concepts described in more detail below, may be considered a part of the inventive subject matter of the present disclosure as long as such concepts are not mutually inconsistent.
The foregoing and other aspects, embodiments, and features of the present teachings will be more fully understood from the following description, taken together with the accompanying drawings. Other additional aspects of the invention, such as features and/or advantages of the exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of the embodiments according to the teachings of the invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic side column strike;
FIG. 2 is a schematic diagram of a power cell;
FIG. 3 is a schematic cross-sectional view of a power cell mounted on a vehicle body;
FIG. 4 is a schematic view of the position of the measurement lead when the power battery is mounted on the vehicle body;
FIG. 5 is a schematic view showing the deformation tendency of the power cell when a side column collision occurs;
Fig. 6 is a schematic view of the lead strip structure.
The meaning of the above reference numerals is as follows:
The power battery comprises an upper power battery shell 1, a lower power battery shell 2, an upper shell overlap surface 21, a lower shell inner side wall 22, a lower shell bottom plate 23, a power battery module 3, a cooling water pipe 4, a measuring device 5 and a cross groove pan head self-tapping screw 51.
Detailed Description
For a better understanding of the technical content of the present invention, specific examples are set forth below, along with the accompanying drawings.
Aspects of the invention are described in this disclosure with reference to the drawings, in which are shown a number of illustrative embodiments. The embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be understood that the various concepts and embodiments described above, as well as those described in more detail below, may be implemented in any of a number of ways, as the disclosed concepts and embodiments are not limited to any implementation. Additionally, some aspects of the disclosure may be used alone or in any suitable combination with other aspects of the disclosure.
The invention aims to develop a method capable of representing the maximum deformation of a power battery in a solid vehicle test of side column collision, and the deformation of a power battery shell after the test is not the maximum deformation in the test process because the power battery shell body rebounds after the side column collision, and the risks that a cooling water pipe 4 in the power battery is extruded, even the power battery fires and the like are in an inseparable relation with the maximum deformation of the power battery after the side column collision, so how to record the maximum deformation of the power battery is the bottleneck which the inventor needs to break through. Finally, from the aspect of material performance, a material with large elongation and small rebound is selected to be manufactured into the measuring device 5, the measuring device 5 is attached to an area of the power battery, which is easy to deform when the side column is bumped, and the measuring device is deformed together with the easily deformed area when the side column is bumped until the easily deformed area is deformed to the maximum, and then the easily deformed area rebounds, and the measuring device 5 cannot rebound along with the easily deformed area due to small rebound, so that the maximum deformation can be recorded.
In particular, with reference to the above-mentioned idea, a specific embodiment of the invention provides the following measuring device 5:
As shown in fig. 6, a device 5 for measuring the maximum deformation of a side column collision power battery is shown, wherein the material of the device 5 has the characteristics of an elongation of more than 30% and a material strength of 20 MPa-60 MPa. The measuring device 5 comprises an end part, a fitting part and a connecting part, wherein the fitting part is connected with the end part through the connecting part, and bending is formed between the connecting part and the fitting part so that the two end parts are positioned on the same side of the fitting part to form a C-shaped structure, the fitting part is matched with the inner side wall of the power battery shell, and the end part is used as a fixed end to fix the measuring device 5 in the power battery shell.
In fig. 6, the vertical portion is a joint portion, a connecting portion is connected to the joint portion in a bending manner, and two ends are end portions. The material meeting the above elongation and material strength has the characteristics of good elongation performance and difficult rebound. The choice of specific materials for the measuring device 5 includes, but is not limited to, lead or aluminum or tin, and the embodiments of the present invention particularly point out these three materials as they are all relatively easy to obtain from the market, especially lead, and are widely used and inexpensive on fishing weights.
The characteristics affecting the elongation and rebound resilience of the material mainly include thickness, strength, hardening index, etc. of the material, and the materials satisfying the properties are more and can be selected according to the need. For the above mentioned lead or aluminum or tin bars, a thickness of 1.0mm-1.5mm is preferred to ensure moderate strength.
The measuring device 5 is mounted inside the housing of the power battery to form a power battery with the measuring device 5.
Specifically, as shown in fig. 3-5, the measuring device 5 is fixed between the power battery housing and the battery module, and two ends of the measuring device 5 are arranged in an up-down direction, wherein a connecting portion corresponding to an upper end is located above the cooling water pipe 4 inside the power battery housing and is mounted on the cooling water pipe 4.
Because when the side column bumps, the outer shell of the power battery is stressed at first, especially the lower shell of the power battery with the cooling water pipe 4, if the cooling water pipe 4 is extruded, the short circuit analysis is easy to occur in the power battery module 3 after water in the cooling water pipe 4 leaks out, so that the scheme needs to pay attention to the stress condition of the lower shell of the power battery. The lower case inside wall 22 is rotated in the arrow direction shown in fig. 5 after being pressed, thereby reducing the gap between the lower case inside wall 22 and the power battery module 3. The measuring device 5 is arranged on the cooling water pipe 4, and the cooling water pipe 4 does not shade the measuring device 5 in the vertical direction, so that deformation is free.
Fig. 3 shows a sectional view of the power battery in the vertical direction of the vehicle. Specifically, in this embodiment, in order to make the measuring device 5 not only fit the inner sidewall of the power battery housing, but also fix the measuring device inside the power battery, the end of the measuring device 5 cannot be positioned on the same straight line with the fitting portion, otherwise, the measuring device 5 is entirely fit on the inner sidewall of the power battery housing, and the maximum deformation measurement is inaccurate due to the rebound influence of the inner sidewall of the power battery housing. Therefore, the end portion needs to be fixed to a portion other than the inner side wall of the power cell lower case 2.
In the present embodiment, the mounting-end measuring device 5 of the measuring device 5 is fixed to the power battery module 3 and the lower case bottom plate 23, respectively, by the cross-slot pan head tapping screw 51 (including but not limited to this manner) that facilitates the mounting; the upper connecting part of the measuring device 5 is arranged above the cooling water pipe 4, obliquely extends to the inner side wall 22 of the lower shell and is attached, and the measuring device 5 is bent to ensure lateral support strength after extending downwards along the inner side wall 22 of the lower shell. To ensure that the measuring device 5 is deformed, which is not caused by deformation and invasion of the upper shell, the upper end of the attaching part does not exceed the upper and lower shell joint surfaces 21 of the power battery, then extends vertically downwards along the inner side wall 22 of the lower shell, and to ensure that the measuring lead strip has certain strength in the vertical direction, is bent inwards after extending to a certain degree along the inner side surface of the lower shell, and then is finally connected with the bottom plate 23 of the lower shell by a cross-grooved pan head self-tapping screw 51 (including but not limited to the mode), and the whole effect is shown in fig. 4.
As shown in fig. 2, the direction indicated by the single arrow is from the front to the rear of the vehicle, the upper housing in the figure is the upper housing 1 of the power battery, and the lower housing matched with the upper housing is the lower housing of the power battery. The double arrow is the range in which the measuring device 5 can be arranged, almost covering the area in which intrusion of the column against the power battery is likely to occur in an actual vehicle.
And (3) carrying out a real vehicle test based on the power battery with the detection device, and taking the deformation of the measurement device 5 as the maximum deformation of the power battery shell after the side column collision occurs. The measured value of the real vehicle test is convenient for CAE simulation analysis and calibration, and simultaneously reflects the risk of fire after the power battery invades, and can be used as a parameter in the field related to the safety performance of the vehicle.
The power battery can be used as a safety test, and the power battery actually leaving the factory can be provided with the detection device, so that a user can obtain the deformation of the battery if the side column bumps in the use process, and the damage degree of the automobile is reflected, so that corresponding measures can be taken at the later stage to ensure the driving safety in the future.
While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present invention. Accordingly, the scope of the invention is defined by the appended claims.
Claims (8)
1. A method for measuring the maximum deformation of a side column collision power battery is characterized by comprising the following steps: a measuring device is fixed between the power battery shell and the battery module inside the power battery shell, the measuring device is at least partially attached to the inner side wall of the power battery shell, and the material of the measuring device has the characteristics of more than 30 percent of elongation and 20-60 MPa of material strength; taking the deformation of the measuring device after the side column collision occurs as the maximum deformation of the power battery shell;
be provided with tip, laminating portion and connecting portion on the measuring device, laminating portion passes through connecting portion and end connection, forms between connecting portion and the laminating portion and bends so that two tip are located the same side of laminating portion, laminating portion and the inside wall laminating of power battery lower casing, the tip is fixed with the part outside the inside wall of power battery lower casing.
2. The method for measuring the maximum deformation of the side column impact power battery according to claim 1, wherein the method comprises the following steps: the two end parts are arranged in the up-down direction, wherein the connecting part corresponding to the upper end part is arranged above the cooling water pipe in the power battery shell and is arranged on the cooling water pipe.
3. The utility model provides a power battery maximum deformation volume measuring device is bumped to side post which characterized in that: the material of the measuring device has the characteristics of more than 30 percent of elongation and 20-60 MPa of material strength; the measuring device comprises an end part, a fitting part and a connecting part, wherein the fitting part is connected with the end part through the connecting part, bending is formed between the connecting part and the fitting part, so that the two end parts are located on the same side of the fitting part, the fitting part is matched with the inner side wall of the power battery shell, the upper end of the fitting part does not exceed the lap joint surface of the upper shell and the lower shell of the power battery, and the end part is used as a fixed end for fixing the measuring device in the power battery shell.
4. A side column impact power cell maximum deformation measuring device according to claim 3, wherein: the measuring device is a lead strip or an aluminum strip or a tin strip.
5. The maximum deformation measurement device for a side column impact power battery according to claim 4, wherein: the thickness of the measuring device is 1.0mm-1.5mm.
6. A power cell, characterized in that: the measuring device according to any one of claims 3 to 5, wherein the measuring device is fixed between the power battery housing and the battery module, and both end parts of the measuring device are arranged in the vertical direction, wherein the connecting part corresponding to the upper end part is positioned above the cooling water pipe in the power battery housing and is arranged on the cooling water pipe.
7. The power cell of claim 6, wherein: the laminating portion of measuring device is laminated with the inside wall of the lower casing of power battery casing, and the upper end of laminating portion does not exceed the fitting surface of power battery upper and lower casings.
8. The power cell of claim 7, wherein: the upper end part of the measuring device is fixed on the power battery module, and the lower end part of the measuring device is fixed on the bottom plate of the lower shell of the power battery.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811480131.9A CN109458974B (en) | 2018-12-05 | 2018-12-05 | Device and method for measuring maximum deformation of side column collision power battery and power battery |
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| CN201811480131.9A CN109458974B (en) | 2018-12-05 | 2018-12-05 | Device and method for measuring maximum deformation of side column collision power battery and power battery |
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| CN109458974B true CN109458974B (en) | 2024-05-31 |
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