CN115931248A - Device and method for testing performance of battery pack sealing material - Google Patents
Device and method for testing performance of battery pack sealing material Download PDFInfo
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- CN115931248A CN115931248A CN202211344209.0A CN202211344209A CN115931248A CN 115931248 A CN115931248 A CN 115931248A CN 202211344209 A CN202211344209 A CN 202211344209A CN 115931248 A CN115931248 A CN 115931248A
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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
Abstract
The invention belongs to the technical field of battery pack sealing performance testing, and particularly relates to a device and a method for testing the performance of a battery pack sealing material. The utility model provides a battery package sealing material capability test device, includes the test box, the test box includes box and upper cover down, fixed connection between upper cover and the lower box, the upper cover has the sealing material with lower box junction rigid coupling, the rigid coupling has the inside and outside gas tube of intercommunication test box on the upper cover up end. The purpose is as follows: the problem that the design of the existing battery pack sealing structure basically depends on the experience of engineers and needs to be repeatedly optimized and verified is solved, the development time is shortened, and the development cost is reduced.
Description
Technical Field
The invention belongs to the technical field of battery pack sealing performance testing, and particularly relates to a device and a method for testing the performance of a battery pack sealing material.
Background
People pay more and more attention to the safety of new energy automobiles, and the safety of the battery pack is used as the most important link of the safety performance of the new energy automobiles. The sealing performance of the battery pack is directly related to the safety of the battery pack, and the sealing performance test of the sealing material is particularly important.
The sealing performance of the existing sealing material is generally determined by engineers according to experience to determine the compression rate of the sealing material, and then whether the sealing performance of the battery pack can be met or not is verified through a whole-pack inflation test or a thermal runaway test, and the sealing performance is repeatedly modified until a sealing target is achieved. The design period is long, the steps are complicated, and the requirements of the product development period cannot be met; the compression rate of the sealing material is determined by depending on the experience of an engineer, so that the contingency is strong; moreover, each test in the test process needs to use a battery pack sample, and the test result is inaccurate due to the influence of the battery pack sample on the change of the compression rate of the sealing material and the influence of the battery pack sample to a certain extent in the test process.
Disclosure of Invention
The purpose of the invention is: the device and the method are used for testing the performance of the sealing material of the battery pack, only one testing box is adopted, and an inflation test is carried out by changing the compression ratio of the sealing material between the upper cover and the lower box body of the testing box, so that the limit pressure values of the sealing performance of the compression material under different compression ratios are obtained, and a determined experimental result is obtained. The test is completed by only one set of test box, the cost is low, and the test result is not influenced by replacing the battery pack sample piece.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
on the one hand, this application provides a battery package sealing material capability test device, including the test box, the test box includes box and upper cover down, fixed connection between upper cover and the lower box, the upper cover has the sealing material with lower box junction rigid coupling, the rigid coupling has the inside and outside gas tube of intercommunication test box on the upper cover up end.
The sealing between the upper cover and the lower box body of the test box is realized by the sealing material in a compressed posture, the test box is inflated and pressurized by the external inflation equipment of the inflation tube, the inflation test is carried out, and the limit pressure of the sealing material for realizing the sealing under the compression rate is determined.
Preferably, a thickness limiting piece is replaceably arranged at the joint between the upper cover and the lower box body. By means of the arrangement, the compression rate of the sealing material is changed by changing the thickness limiting pieces with different heights.
Preferably, the inflation tube is connected to an inflation device. The inflation device is arranged to inflate the inflation tube to complete the inflation test.
In a second aspect, the present application also provides a method for testing the performance of a battery pack sealing material, which is applied to the above testing apparatus, the method including:
s1: selecting a thickness limiting part, determining the initial compression rate of the sealing material, and assembling the testing device;
s2: performing a pressurization and inflation test in the test box to obtain a sealing limit pressure value of the sealing material under the initial compression rate corresponding to the thickness limiting part;
s3: and (5) replacing the limiting parts with different thicknesses, repeating the step (S2), obtaining the sealing limit pressure values of the sealing material under different compression ratios, and determining the sealing performance parameters of the sealing material.
Optionally, selecting a thickness limiting member, determining an initial compression rate of the sealing material, and assembling the testing apparatus, includes:
and a thickness limiting part is selected, the upper cover is installed on the lower box body through the thickness limiting component, the sealing material is compressed to the same height as the thickness limiting part under the action of the upper cover to realize sealing at the connecting position of the upper cover and the lower box body, and the inflation tube is connected with inflation equipment.
Optionally, the pressurized air test comprises:
and pressurizing the test box through the inflating equipment until the pressure in the test box reaches a first preset pressure value, and adding preset equal-pressure gas into the test box at intervals of a first preset time.
Optionally, within the first preset duration of each inflation interval, observing the pressure in the test box through the inflation equipment, and if the pressure is reduced, judging that the sealing material leaks air;
if the pressure intensity is not changed, adding the gas with the equal pressure intensity again at intervals of the first preset time length;
and reducing the pressure in the test box after the equal-pressure gas is added into the test box, and obtaining the sealing limit pressure value of the sealing material under the compression rate.
Optionally, replacing the limiting members with different thicknesses, repeating the step S2, obtaining the sealing limit pressure values of the sealing material under different compression ratios, and determining the sealing performance parameters of the sealing material, including:
and (3) replacing the limiting parts with different thicknesses, and repeating the step (S2) to enable the sealing material to carry out the pressurization and inflation test on the test box under different compression ratios, so as to determine the sealing limit pressure values of the sealing material under different compression ratios.
The invention adopting the technical scheme has the advantages that:
1. the test is carried out through the test box body, a battery pack sample does not need to be replaced after each test, so that the loss of the battery pack sample in the test process is reduced, and the reliability of the test is higher because the sealing limit pressure values of the sealing material under different compression rates are finished only through the same set of test box;
2. through changing different thickness locating parts, compress sealing material to the thickness such as with thickness locating part height, again with upper cover and lower box fixed connection, seal through the sealing material of compression, carry out the pressurization restart experiment, convenient and fast reachs the sealing limit pressure value of sealing material under different compression ratios.
Drawings
The invention is further illustrated by the non-limiting examples given in the accompanying drawings;
FIG. 1 is a schematic view of the overall structure of a test box of an embodiment of a device for testing the performance of a battery pack sealing material according to the present invention;
fig. 2 is an exploded view of a testing box with a gasket set as a thickness limiting member according to an embodiment of the device for testing the performance of a sealing material of a battery pack;
FIG. 3 is a flowchart illustrating the steps of one embodiment of the method for testing the performance of the sealing material of the battery pack;
FIG. 4 is a schematic diagram showing the relationship between the compression ratio and the sealing limit pressure when polyurethane foam is selected as the sealing material for testing.
The main element symbols are as follows:
1. a test box; 11. an upper cover; 111. an inflation tube; 12. a lower box body; 2. a thickness limiting member; 3. and (3) sealing the material.
Detailed Description
The present invention will be described in detail with reference to the drawings and specific embodiments, wherein like reference numerals are used for similar or identical parts in the drawings or the description, and implementations not shown or described in the drawings are known to those of ordinary skill in the art. In addition, directional terms, such as "upper", "lower", "top", "bottom", "left", "right", "front", "rear", etc., used in the embodiments are only directions referring to the drawings, and are not intended to limit the scope of the present invention.
As shown in fig. 1, the device for testing the performance of the sealing material for the battery pack comprises a testing box 1, wherein the testing box 1 comprises a lower box body 12 and an upper cover 11, the lower box body 12 is integrally cast, a thickness limiting piece 2 is arranged between the upper cover 11 and the lower box body 12, a sealing material 3 is bonded at the joint of the upper cover 11 and the lower box body 12, the upper cover 11 and the lower box body 12 are fixedly connected by penetrating through the thickness limiting piece 2 through a bolt, the sealing material 3 is compressed to be equal to the thickness limiting piece 2 in connection, the sealing between the upper cover 11 and the lower box body 12 is completed through the sealing material 3, and an inflation tube 111 for communicating the inside and the outside of the testing box 1 is welded on the upper end face of the upper cover 11.
The compression rate of the sealing material 3 is limited by the thickness limiting part 2, the sealing of the test box 1 is realized by the sealing material 3, the test box 1 is pressurized by the inflation tube 111, a pressurization and inflation test is carried out, and the corresponding sealing limit pressure value of the sealing material 3 under the compression rate is determined.
In this embodiment, it should be noted that the size of the test box 1 can be designed as required. The joint surface where the sealing material 3 is attached to the lower case 12 and the upper cover 11 has sufficient rigidity. The preferred stiffness criteria is that the frame of the universal lower housing 12 and the upper cover 11 deform less than 0.01mm in the z-direction when the internal pressure reaches 100 KPa.
As shown in fig. 1 and fig. 2, in the present embodiment, the thickness-limiting member 2 is replaceably provided between the upper cover 11 and the lower case 12. By removing the bolts and replacing the thickness-limiting members 2 with different heights, the upper cover 11 can compress the sealing material 3 to a thickness equal to the thickness of the thickness-limiting members 2 and then mount the sealing material onto the lower case 12, so as to change the compression ratio of the sealing material 3.
In this embodiment, the thickness limiting component may be a gasket set, and a plurality of gaskets with the same thickness are connected in series to the bolt, so that the number of the gasket set is changed to change the height of the thickness limiting component 2, thereby achieving the effect of changing the compression ratio of the sealing material 3 compressed to the same height as the thickness limiting component 2.
It is understood that in other embodiments of the present application, the thickness limiting member 2 may be a sufficiently rigid part that can support between the upper cover 11 and the lower case 12. Such as a sleeve, the sleeve is sleeved on the bolt, and the aim of changing the compression ratio of the sealing material 3 is fulfilled by replacing the sleeves with different heights.
In this embodiment, the inflation tube 111 is externally connected with an inflation device. The preferred inflation apparatus is a leak detector that can both inflate the test chamber 1 and detect if the pressure in the test chamber 1 has dropped when inflation is stopped.
As shown in fig. 3, the present invention further provides a method for testing the performance of a battery pack sealing material, which is applied to the above testing apparatus, and the method includes:
s1: selecting a thickness limiting part 2, determining the initial compression rate of a sealing material 3, and assembling the testing device;
s2: performing a pressurization and inflation test in the test box 1 to obtain a sealing limit pressure value of the sealing material 3 under the initial compression rate corresponding to the thickness limiting part 2;
s3: and (5) replacing the different thickness limiting parts 2, repeating the step S2, obtaining the sealing limit pressure values of the sealing material 3 under different compression ratios, and determining the sealing performance parameters of the sealing material 3.
Selecting a thickness limiting part 2, assembling the testing device by the sealing material 3 under the initial compression ratio, and then performing an inflation pressurization test in the testing box 1 to obtain a sealing limit pressure value of the sealing performance of the sealing material 3 under the initial compression ratio; and replacing the thickness limiting part 2 to change the compression ratio of the sealing material 3, obtaining the sealing limit pressure value of the sealing material 3 under different compression ratios, and determining the sealing performance parameters of the sealing material 3.
As an alternative embodiment, the method for assembling the testing device by selecting the thickness limiting member 2, determining the initial compression rate of the sealing material 3 comprises the following steps:
selecting a thickness limiting piece 2, installing an upper cover 11 on a lower box body 12 through a thickness limiting assembly, compressing a sealing material 3 to the same height as the thickness limiting piece 2 under the action of the upper cover 11 to realize sealing at the connecting position of the upper cover 11 and the lower box body 12, and connecting an inflation pipe 111 with inflation equipment.
It can be understood that a gasket group is selected as the thickness limiting component, a bolt penetrates through the gasket group, the sealing material 3 is fixedly installed at the joint of the upper cover 11 and the lower box body 12 in a compressed state to realize the sealing of the test box 1, and the leakage detector is connected to the inflation tube 111 as an inflation device. The initial compression rate is calculated from the normal thickness L1 of the seal material 3 and the height L2 of the gasket group:
initial compression ratio =1-L2/L1
In the present embodiment, the initial compression rate of the seal material 3 is set to 20%, that is, the height of the gasket group is 80% of the normal thickness dimension of the seal material 3.
As an alternative embodiment, the pressurized air test comprises:
pressurizing the test box 1 through the inflating equipment until the pressure in the test box 1 reaches a first preset pressure value, and adding preset equal-pressure gas into the test box 1 at intervals of a first preset time length.
It is understood that the first preset pressure value is 5KPa, and the first preset pressure value is a pressure value at which the sealing material 3 is about to approach the sealing limit pressure, and at the first preset pressure value, the sealing material 3 does not leak gas. The first preset time is 120S, and the pressure of the preset equal-pressure gas is 2KPa.
As an alternative embodiment, within the first preset time interval of each inflation interval, observing the pressure inside the test box 1 through the inflation equipment, and if the pressure drops, determining that the sealing material 3 leaks;
if the pressure intensity is not changed, adding the gas with the equal pressure intensity again at intervals of the first preset time length;
until the pressure in the test box 1 is reduced after the gas with the equal pressure is added into the test box 1, and the sealing limit pressure value of the sealing material 3 under the compression ratio is obtained.
It will be understood that at each inflation interval, if the pressure drops, the test chamber 1 does not leak at the seal, i.e. the sealing material 3, which is the ultimate pressure of the sealing material 3 to achieve the sealing effect. If the pressure in the test box 1 is not reduced within 120S time, 2KPa gas is added into the test box 1 again until the pressure in the test box 1 is reduced, and the limit pressure value of the sealing material 3 for realizing the sealing effect is determined.
As an alternative embodiment, replacing different thickness limiting members 2, repeating step S2, obtaining the sealing limit pressure value of the sealing material 3 under different compression rates, and determining the sealing performance parameter of the sealing material 3, includes:
and (3) replacing different thickness limiting pieces 2, repeating the step (S2), so that the sealing material 3 performs the pressurization and inflation test on the test box 1 at different compression ratios, determining the sealing limit pressure values of the sealing material 3 at different compression ratios, and finding out the compression ratio of the sealing material 3 with the best sealing performance.
It can be understood that after the sealing limit pressure of the sealing material 3 corresponding to the initial compression ratio is obtained, the height of the gasket set is reduced, the compression ratio of the sealing material 3 is increased, the above inflation and pressurization test is repeated, the sealing limit pressure values of the sealing material 3 at different compression ratios are determined, and the compression ratio of the sealing material 3 with the best sealing performance is found. In the test, the test was stopped when the compressibility of the seal material 3 was 76%.
It should be noted that the sealing material 3 may be selected according to research and development requirements, as shown in fig. 4, polyurethane foam is selected as the sealing material 3, and the device and the method are used for testing, so as to obtain a schematic diagram of a relationship between a compression ratio and a sealing limit pressure.
By testing the sealing performance of the sealing material 3, the sealing limit pressure values of the sealing material 3 under different compression ratios can be obtained, the design of the sealing structure can be directly guided, and the deformation data of the box body obtained by finite element analysis can be combined to directly judge whether the sealing structure of the battery pack meets the requirements. The problem that the design of the existing battery pack sealing structure basically depends on the experience of engineers and needs to be repeatedly optimized and verified is solved, the development time is shortened, and the development cost is reduced.
The device and the method for testing the performance of the battery pack sealing material provided by the invention are described in detail above. The description of the specific embodiments is only intended to facilitate an understanding of the method of the invention and its core ideas. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (8)
1. A battery package sealing material performance testing device is characterized in that: the testing box comprises a testing box body and an upper cover, wherein the upper cover is fixedly connected with the lower box body, a sealing material is fixedly connected with the joint of the upper cover and the lower box body, and an inflation tube communicated with the inside and the outside of the testing box is fixedly connected to the upper end face of the upper cover.
2. The device for testing the performance of the battery pack sealing material according to claim 1, wherein: the junction between upper cover and the lower box body is provided with thickness locating part replaceably.
3. The device for testing the performance of the battery pack sealing material according to claim 1, wherein: the inflation tube is connected with inflation equipment.
4. A method for testing the performance of a battery pack sealing material is characterized by comprising the following steps: the test device of any one of claims 1-3, wherein the method comprises:
s1: selecting a thickness limiting part, determining the initial compression rate of the sealing material, and assembling the testing device;
s2: performing a pressurization and inflation test in the test box to obtain a sealing limit pressure value of the sealing material under the initial compression rate corresponding to the thickness limiting part;
s3: and (3) replacing the limiting parts with different thicknesses, repeating the step S2, obtaining the sealing limit pressure values of the sealing material under different compression ratios, and determining the sealing performance parameters of the sealing material.
5. The method for testing the performance of the battery pack sealing material according to claim 4, wherein the method comprises the following steps: selecting a thickness limiting part, determining the initial compression rate of the sealing material, and assembling the testing device, wherein the method comprises the following steps:
and a thickness limiting part is selected, the upper cover is installed on the lower box body through the thickness limiting component, the sealing material is compressed to the same height as the thickness limiting part under the action of the upper cover to realize sealing at the connecting position of the upper cover and the lower box body, and the inflation tube is connected with inflation equipment.
6. The method for testing the performance of the battery pack sealing material according to claim 4, wherein the method comprises the following steps: the pressurized air test comprises:
and pressurizing the test box through the inflating equipment until the pressure in the test box reaches a first preset pressure value, and adding preset equal-pressure gas into the test box at intervals of a first preset time.
7. The method for testing the performance of the battery pack sealing material according to claim 6, wherein:
observing the pressure in the test box through the inflating equipment within the first preset time of each inflation interval, and if the pressure is reduced, judging that the sealing material is air-leaked;
if the pressure intensity is not changed, adding the gas with the equal pressure intensity again at intervals of the first preset time length;
until the pressure in the test box is reduced after the equal-pressure gas is added into the test box, and the sealing limit pressure value of the sealing material under the compression rate is obtained.
8. The method for testing the performance of the battery pack sealing material according to claim 4, wherein the method comprises the following steps: replacing different thickness limiting parts, repeating the step S2, obtaining the sealing limit pressure value of the sealing material under different compression rates, and determining the sealing performance parameters of the sealing material, wherein the steps comprise:
and (3) replacing the limiting parts with different thicknesses, and repeating the step (S2) to enable the sealing material to carry out the pressurization and inflation test on the test box under different compression ratios, so as to determine the sealing limit pressure values of the sealing material under different compression ratios.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211344209.0A CN115931248A (en) | 2022-10-31 | 2022-10-31 | Device and method for testing performance of battery pack sealing material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211344209.0A CN115931248A (en) | 2022-10-31 | 2022-10-31 | Device and method for testing performance of battery pack sealing material |
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| Publication Number | Publication Date |
|---|---|
| CN115931248A true CN115931248A (en) | 2023-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211344209.0A Pending CN115931248A (en) | 2022-10-31 | 2022-10-31 | Device and method for testing performance of battery pack sealing material |
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| CN (1) | CN115931248A (en) |
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- 2022-10-31 CN CN202211344209.0A patent/CN115931248A/en active Pending
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