CN115184160A - End plate strength testing device and method - Google Patents
End plate strength testing device and method Download PDFInfo
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- CN115184160A CN115184160A CN202210957699.5A CN202210957699A CN115184160A CN 115184160 A CN115184160 A CN 115184160A CN 202210957699 A CN202210957699 A CN 202210957699A CN 115184160 A CN115184160 A CN 115184160A
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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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
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- 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
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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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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Abstract
本发明提供了一种端板强度测试装置及方法，包括底座和压板；所述底座包括支撑件，所述支撑件顶部向下凹陷形成有支撑件配合面，所述支撑件配合面用于放置端板底部的绑带配合区域；所述压板包括压板第一表面，所述压板第一表面用于与所述端板的上表面抵紧配合，且所述压板第一表面的中心与所述端板上表面的中心对应设置。本发明通过采用底座和压板对端板强度进行测试，通过采用与绑带配合区域相匹配的支撑件配合面，通过采用与二次电池的膨胀力和膨胀量相匹配的压板第一表面，真实的模拟端板承受模组膨胀力变形的情况，有助于快速完成端板强度的测试，有助于提高测试的效率和保证测试的准确性。
The invention provides an end plate strength testing device and method, comprising a base and a pressing plate; the base includes a support, the top of the support is recessed downward to form a support mating surface, and the support mating surface is used for placing The strap fitting area at the bottom of the end plate; the pressure plate includes a first surface of the pressure plate, the first surface of the pressure plate is used for abutting fit with the upper surface of the end plate, and the center of the first surface of the pressure plate is in line with the The center of the upper surface of the end plate is set correspondingly. In the present invention, the strength of the end plate is tested by using the base and the pressing plate, by using the supporting member matching surface matching the matching area of the strap, and by using the first surface of the pressing plate matching the expansion force and expansion amount of the secondary battery, the real The simulated end plate is deformed by the expansion force of the module, which helps to quickly complete the end plate strength test, helps to improve the efficiency of the test and ensure the accuracy of the test.
Description
Technical Field
The invention relates to the technical field of battery manufacturing, in particular to an end plate strength testing device and method.
Background
At present in the end plate development process of module, in order to test end plate intensity, test the ability of bearing of the single bulging force of secondary battery of end plate in to the module promptly, need design and preparation including the module of this section end plate, develop module charge-discharge cycle test after that, develop the test until the capacity of module reaches the state at end of life always, this mode has following several problems: 1. the test has very long time consumption, the time consumption is about 1.5 years, and obvious contradiction conflict exists between the test and the short lead-in service cycle of product development, so that the product development requirement is not met; 2. the end plates are not used for fully guiding the modules into a product for use after verifying the expansion force bearing capacity of the modules, and the grouped modules have the risk of short circuit caused by the breakage of the end plates; 3. the module comprising the end plate is designed and manufactured for testing, the occupied equipment resource time is long, the testing efficiency is low, and the testing cost is very expensive.
The prior Chinese patent with publication number CN212871567U discloses a battery module expansion force testing device. The device for testing the expansion force of the battery module comprises a support assembly, two equivalent end plates, a pre-pressing mechanism and a cover plate, wherein the support assembly comprises a U-shaped accommodating space defined by a bottom plate, a first side plate and a second side plate which are arranged in parallel, and the battery module is arranged in the accommodating space; the two equivalent end plates are parallel to the first side plate and are respectively arranged at two ends of the battery module, and a first pressure sensor is arranged between each equivalent end plate and the battery module; the pre-pressing mechanism is connected with the first side plate and used for extruding the equivalent end plate so as to tightly press the battery module on the second side plate with adjustable pressure; the cover plate is detachably connected to the upper side of the supporting component and is parallel to the bottom plate, and a second pressure sensor is arranged between the cover plate and the battery module.
The inventor thinks that the expansive force testing device in the prior art is a testing device for batteries, lacks a testing device for the ability of bearing the expansive force to the battery end plate, and the prior testing technology is long in time consumption and low in testing efficiency, so that the end plate strength testing device is required to be provided for testing the bearing ability of the battery end plate to the expansion force of the module.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an end plate strength testing device and method.
The end plate strength testing device provided by the invention comprises a base and a pressing plate; the base comprises a support piece, the top of the support piece is recessed downwards to form a support piece matching surface, and the support piece matching surface is used for placing a binding belt matching area at the bottom of the end plate; the pressing plate comprises a pressing plate first surface, the pressing plate first surface is used for being abutted and matched with the upper surface of the end plate, and the center of the pressing plate first surface is arranged corresponding to the center of the upper surface of the end plate; the platen also includes a platen second surface opposite the platen first surface for transferring a load applied by a testing apparatus to the end plate.
Preferably, the first surface of the pressure plate comprises a downwardly convex arc surface, and the convex degree of the arc surface is gradually increased from the edge of the first surface of the pressure plate to the central position.
Preferably, the maximum height of the protrusions on the first surface of the pressing plate is G, the thickness of the secondary battery monomer is H, and G is more than or equal to 0.35H and more than or equal to 0.002H.
Preferably, the first surface of the pressure plate comprises a single hump surface, and the single hump surface forms a hemispherical bulge downwards from the central position of the first surface of the pressure plate.
Preferably, the first surface of the pressing plate comprises a multi-hump surface, the multi-hump surface forms a plurality of hemispherical bulges downwards from the first surface of the pressing plate, and the multi-hump surface comprises more than two hump surfaces.
Preferably, the support fitting surface comprises an arc surface and an avoiding groove, and the shape of the arc surface is matched with the binding belt fitting area; the depth of the avoidance groove is not more than 10 times of the width of the matching surface of the support piece, and is not less than 0.1 time of the width of the matching surface of the support piece.
Preferably, the width of the strap engaging region is 0.1-20 mm greater than the width of the support member engaging surface.
Preferably, the base further comprises a mounting seat, the mounting seat comprises a plurality of mounting holes, and the support member can be mounted at different positions of the mounting seat through different mounting holes.
Preferably, the two supporting pieces are correspondingly installed on the installation seat, two groups of binding belt matching areas are symmetrically arranged on the end plate, and the distance between the two supporting pieces is consistent with the distance between the two groups of binding belt matching areas.
According to the method for testing the strength of the end plate, which is provided by the invention, the end plate strength testing device is adopted, and the testing equipment capable of being pressurized is also adopted, and the method comprises the following steps:
s1, placing a base of the end plate strength testing device on a platform of the testing equipment;
s2, placing the end plate on the supporting pieces, and adjusting the distance between the two supporting pieces to enable the binding belt matching area to be matched with the matching surface of the supporting pieces;
s3, placing the pressing plate on the end plate;
s4, placing a pressure head of the test equipment at the center of the second surface of the pressure plate, so that the centers of the pressure head, the pressure plate and the end plate are on the same vertical line;
and S5, pressurizing the pressing plate, wherein the initial pressure is 0N, the pressure threshold value is the maximum expansion force of the battery, and the value range of the pressurizing speed is 0.1-450 mm/min.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention tests the strength of the end plate by adopting the base and the pressing plate, truly simulates the condition that the end plate bears the expansion force deformation of the module by adopting the matching surface of the supporting piece matched with the matching area of the binding band and the first surface of the pressing plate matched with the expansion force and the expansion amount of the secondary battery, is beneficial to rapidly completing the test of the strength of the end plate, and is beneficial to improving the test efficiency and ensuring the test accuracy.
2. According to the invention, the supporting piece matching surface is arranged on the supporting piece, the cambered surface with the radian consistent with that of the binding belt matching area is arranged on the supporting piece matching surface, and the avoidance groove for reserving a space due to deformation of the middle part of the end plate is arranged on the supporting piece matching surface, so that the condition that the end plate bears the deformation of the module expansive force can be simulated really, the test efficiency can be improved, and the test accuracy can be ensured.
3. The mounting seat and the supporting piece are detachably mounted, the mounting position of the supporting piece can be adjusted, the supporting piece matched with the end plate is replaced, the universality of the base is improved, and the testing speed and the testing efficiency are improved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic view of the overall structure of a device for testing the strength of an end plate according to the present invention;
FIG. 2 is a schematic structural diagram of a base according to the present invention;
FIG. 3 is a schematic structural view of an end plate embodying the present invention;
FIG. 4 is a bottom plan view of an end plate embodying the present invention;
FIG. 5 is a front view of a platen embodying the present invention;
FIG. 6 is a top plan view of a platen embodying the present invention;
FIG. 7 is a front view of a support embodying the present invention;
FIG. 8 is a top view of a support embodying the invention;
FIG. 9 is a schematic view showing a first surface shape of a pressing plate in a main embodiment variation 1 of the present invention;
FIG. 10 is a schematic view showing a first surface shape of a pressing plate in a variation 2 of the main embodiment of the present invention;
fig. 11 is a schematic view showing the shape of the first surface of the platen according to variation 3 of the present invention.
Shown in the figure:
Cambered surface 1211 avoiding groove 1212 of support member mating surface 121
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1
As shown in fig. 1 to 6, an end plate strength testing apparatus according to the present invention includes a base 1 and a pressing plate 2; the base 1 comprises a support 12, the top of the support 12 is recessed downwards to form a support matching surface 121, and the support matching surface 121 is used for placing a binding belt matching area 31 at the bottom of the end plate 3; the pressing plate 2 comprises a pressing plate first surface 21, the pressing plate first surface 21 is used for being abutted and matched with the upper surface of the end plate 3, and the center of the pressing plate first surface 21 is arranged corresponding to the center of the upper surface of the end plate 3; the pressing plate 2 further includes a pressing plate second surface 22 opposite to the pressing plate first surface 21, and the pressing plate second surface 22 is used for transmitting the load applied by the testing equipment to the end plate 3, namely, the module expansion force applied by the secondary battery cell to the end plate 3 is simulated.
At present in the end plate development process of module, in order to test end plate intensity, test the end plate promptly and bear the free expansibility's of secondary cell in the module performance, need design and make the module of this kind of end plate, this application has been avoided piling up a real module and has been done long period cycle and verify, the completion end plate that can be quick bears the test verification of the condition of module expansibility, and keep unanimous basically with actual conditions, very big improvement the efficiency of end plate intensity test and the accuracy of assurance test.
The first surface 21 of the pressing plate is in abutting fit with the upper surface of the end plate 3 for simulating the expansion force applied to the end plate 3 by the secondary battery in the module. In order to enhance the rigidity of the platen 2 and prevent the platen 2 from being deformed, the thickness of the base material of the platen 2 has a value ranging from 5 to 200mm. The size of the first surface 21 of the pressing plate is not smaller than that of the surface of the secondary battery, and preferably, both are the same size, so that the pressing plate 2 can more truly simulate the secondary battery cell.
Because the different positions of the large surface of the secondary battery have different expansion forces, the expansion amounts of the different positions of the large surface of the secondary battery are different, and therefore the pressing plate 2 is designed to be of a structure with different thicknesses, namely the pressing plate 2 is designed to be of a variable cross section structure, and the first surface 21 of the pressing plate can simulate the surface of the secondary battery more truly. The swelling force and swelling amount of the secondary battery are gradually reduced from the middle of the large face to the peripheral edge, the first surface 21 of the pressing plate includes a downwardly convex arc face, and the degree of protrusion of the arc face is gradually increased from the edge of the first surface 21 of the pressing plate to the central position.
As shown in FIG. 5, the maximum height of the protrusions of the first surface 21 of the pressing plate is G, which is 0.35 H.gtoreq.G.gtoreq.0.002H in relation to the thickness H of the secondary battery cell. The module is in carrying out the use of charging and discharging many times, and secondary battery monomer takes place the inflation and produces the bulging force simultaneously in the module, and electric core inflation volume is between 0.002 times electric core thickness and 0.35 times electric core thickness, consequently for the inflation volume and the bulging force of more accurate use clamp plate simulation electric core, consequently the bellied maximum height G of clamp plate first surface 21 is more than or equal to G for 0.35H and is more than or equal to 0.002H with secondary battery monomer thickness H's relation. The first surface 21 of the pressing plate is in a convex jklmn arc shape, the point I is the maximum height point of the first surface 21 of the pressing plate, and the heights of the jkl arc section and the nml arc section are increased from 0 to G, so that the situation that the expansion force and the expansion amount of the secondary battery are gradually reduced from the middle of the large surface to the four edges is simulated. The shape of the second surface 22 of the pressure plate may include a horizontally disposed plane, an arc surface, etc., and in this embodiment, without limitation, the load applied by the testing equipment may be transmitted to the end plate 3.
The pressing plate 2 is made of high-hardness materials, such as carbon steel materials, stainless steel materials, hard plastics, stone materials and the like.
The base 1 comprises a mounting seat 11 and supporting pieces 12, wherein the supporting pieces 12 are mounted on the mounting seat 11, and the number of the supporting pieces 12 can be two or more according to the actual use condition. The mounting seat 11 and the supporting member 12 are connected into a whole by bolts and/or welding, or the mounting seat 11 and the supporting member 12 are integrally formed, for example, integrally formed by machining or die casting. In order to increase the versatility of the base 1 and to be suitable for testing a plurality of types of end plates 3, the base 1 is preferably designed as a removable and movable structural member. Including a plurality of mounting holes on the mount pad 11, support piece 12 can install in the different positions of mount pad 11 through the mounting hole of difference, through bolted connection, realizes installation, dismantlement, change position, has improved base 1's suitability greatly.
Two supporting pieces 12 are correspondingly arranged on the mounting seat 11, two groups of binding belt matching areas 31 are symmetrically arranged on the end plate 3, and the distance between the two supporting pieces 12 is consistent with the distance between the two groups of binding belt matching areas 31.
As shown in fig. 7 and 8, the strap engagement region 31 is placed on the support member engagement surface 121, the support member engagement surface 121 includes an arcuate surface 1211 and an escape groove 1212, and the arcuate surface 1211 is shaped to match the strap engagement region 31. Generally, the strap engaging area 31 is circular arc shaped, and correspondingly, the arc 1211 is also circular arc shaped, so as to fully simulate the position of the strap on the end plate 3, thereby ensuring the accuracy of the test.
The width of the binding belt matching area 31 is B, the distance between the two groups of binding belt matching areas 31 is A, the width of the binding belt is C, the width of the supporting piece matching surface 121 is D, preferably, C is equal to D, the numerical value of B is 0.1-20 mm larger than that of D, and the binding belt limiting effect is achieved.
Generally, a set of strap engaging areas 31 formed by a strap includes two arcuate surfaces, and correspondingly, arcuate surface 1211 includes arc segments abc and fgh, and arcuate surface 1211 makes contact with strap engaging areas 31 in a large surface. The avoiding groove 1212 is a cdef groove between abc and fgh arc surface sections, the depth of the groove is E, and the width relation with the binding band is as follows: e is more than or equal to 0.1C and less than or equal to 10C, and the testing device is used for reserving a space for the middle deformation of the tested end plate 3 so as to simulate the condition that the end plate 3 bears the expansion force deformation of the module more truly.
This application can guarantee that it is unanimous with the distance between two sets of bandage cooperation areas 31 through adjusting the distance between two support piece 12 when using, and the true simulation end plate 3 bears the condition that the module expansive force warp. It is also possible to directly replace the support member 12 with an arc 1211 having a matching arc and a matching depth of the escape groove 1212. This application can match the not end plate 3 of co-altitude and different forms, has improved base 1's commonality greatly. This application can be quick the completion end plate bear the test verification of the condition of module bulging force to keep unanimous basically with actual conditions, very big improvement the efficiency of end plate strength test and the accuracy of assurance test.
Modification example 1
As shown in fig. 9, based on example 1, the first surface 21 of the pressing plate may be a horizontally disposed plane in addition to a downwardly convex arc surface, and in a possible implementation manner, the pressing plate 2 may be made of a material with a hardness smaller than that in example 1, so as to simulate the deformation of the secondary battery case in the module, and thereby simulate the expansion of the secondary battery at different positions on the large surface, thereby ensuring more comprehensive simulation and improving the accuracy of the test; in other possible embodiments, the same material as in example 1 can be used for the pressure plate 2.
As shown in fig. 10, based on embodiment 1, the first surface 21 of the pressing plate may be a single hump surface, in addition to a downward convex arc surface, and the single hump surface forms a hemispherical protrusion downward from the central position of the first surface 21 of the pressing plate, so as to simulate the expansion of the large surface of the secondary battery at different positions, thereby ensuring more comprehensive simulation and improving the accuracy of the test.
As shown in fig. 11, based on embodiment 1, the first surface 21 of the pressing plate may be a multi-hump surface in addition to a downwardly convex arc surface, where the multi-hump surface includes more than two hump surfaces, and the number of hump surfaces is not specifically limited in the embodiment of the present application.
Further, the first surface 21 of the pressing plate can also be more than 3 hump surfaces, more than 3 hemispherical protrusions are formed downwards from the first surface 21 of the pressing plate, the number of the hump surfaces is not specifically limited in the embodiment of the application, and the number of the hump surfaces is consistent with the number of the hemispherical protrusions formed downwards from the first surface 21 of the pressing plate. In addition, the heights of the hemispherical bulges formed by the hump surfaces can be consistent or inconsistent. In a possible embodiment, the hump surface may include a first hump surface disposed from a center of the first surface 21 of the pressing plate, and a plurality of second hump surfaces are disposed around a circle with the first hump surface as a center and a predetermined distance as a radius, wherein a height of the downward protrusion of the first hump surface is greater than a thickness of the downward protrusion of the second hump surface. In other possible embodiments, a plurality of third hump surfaces, a plurality of fourth hump surfaces, and the like may be further included, which are sequentially disposed on the first surface 21 of the self-pressing plate with the center position as the center of the circle, and the heights of the protrusions are sequentially reduced. For example, the plurality of second hump faces, third hump faces, etc. can also be enclosed in other shapes, such as a square, a regular polygon, a pentagram, etc.
Example 2
According to the method for testing the strength of the end plate, which is provided by the invention, based on the end plate strength testing device in the embodiment 1, the testing device capable of pressurizing is also adopted, and the method comprises the following steps:
s1, placing a base 1 of an end plate strength testing device on a platform of testing equipment, wherein the range of applicable pressure of the testing equipment is preferably 0-100000N;
step S2, placing the end plate 3 on the support members 12, and adjusting the distance between the two support members 12 to enable the binding belt matching area 31 to be matched with the cambered surface 1211;
s3, placing the pressing plate 2 on the end plate 3, wherein the center of the first surface 21 of the pressing plate corresponds to the center of the upper surface of the end plate 3;
s4, placing a pressure head of the test equipment at the center of the second surface 22 of the pressure plate, and enabling the centers of the pressure head, the pressure plate 2 and the end plate 3 to be on the same vertical line, so that the mode of the expansion force of the pressure plate 2 applied to the end plate 3 and the expansion force of a secondary monomer in the module applied to the end plate 3 are kept consistent;
and S5, pressurizing the pressing plate 2, wherein the initial pressure is 0N, the pressure threshold value is the maximum expansion force of the battery, and the value range of the pressurizing speed is 0.1-450 mm/min. Different pressurization speed has simulated the module and has transferred under the charging and long-time storage condition under different multiplying powers, and the module inflation force variation process that the module applied to terminal plate 3 specifically can set up according to actual conditions.
Regarding the process of loading trial, the initial pressure is 0N, then the pressurization is carried out at the speed of a designed V, the value range of the V is 1-100 mm/min, and 2 modes of pressurization stop exist; in the first mode, the end plate 3 is directly crushed, and the end plate 3 cannot continuously bear the pressure because the end plate 3 is crushed; and secondly, setting a threshold value of the load applied by the testing equipment according to the maximum expansion force of the secondary battery cell at the end of the service life, stopping the pressure test when the threshold value is reached, and then checking the condition of the end plate 3 to determine whether cracks or fragments are damaged. If the end plate 3 is broken, it indicates that the strength of the end plate 3 is insufficient; if the end plate 3 is not broken, the strength of the end plate 3 can withstand the expansion force of the inner secondary battery cells of the module, and the module can be used.
This application has simulated the test of end plate strength, and this test can be accomplished the test in very short time, and quick completion end plate 3 bears the performance verification of module bulging force. The testing device and the testing process thereof have the advantages that the occupied equipment resource time is very short, the testing cost is greatly reduced, the end plate 3 can be rapidly and fully verified to be free of broken risks, and then the project can be rapidly promoted to be developed, so that the great significance is realized.
Principle of operation
Placing a base 1 of the end plate strength testing device on a platform of testing equipment, wherein the range of the applicable pressure of the testing equipment is preferably 0-100000N; placing the end plate 3 on the supports 12, adjusting the distance between the two supports 12 so that the strap fitting region 31 fits with the arc 1211; placing the pressing plate 2 on the end plate 3, wherein the center of the first surface 21 of the pressing plate corresponds to the center of the upper surface of the end plate 3; placing a pressure head of the test equipment at the center of the second surface 22 of the pressure plate, so that the centers of the pressure head, the pressure plate 2 and the end plate 3 are positioned on the same vertical line, and thus the mode of the expansion force of the pressure plate 2 applied to the end plate 3 is consistent with the mode of the expansion force of the secondary monomer in the module applied to the end plate 3; and pressurizing the pressure plate 2, wherein the initial pressure is 0N, the pressure threshold value is the maximum expansion force of the battery, and the value range of the pressurizing speed is 0.1-450 mm/min. If the end plate 3 is broken, it indicates that the strength of the end plate 3 is insufficient; if the end plate 3 is not broken, the strength of the end plate 3 can withstand the expansion force of the inner secondary battery cells of the module, and the module can be used.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, are not to be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
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