CN218180522U - End plate strength test device - Google Patents

Abstract

The utility model provides an end plate strength testing device, which 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 first pressing plate surface, the first pressing plate surface is used for being tightly matched with the upper surface of the end plate in an abutting mode, and the center of the first pressing plate surface corresponds to the center of the upper surface of the end plate. The utility model discloses an adopt base and clamp plate to test end plate intensity, through adopting with the regional assorted support piece fitting surface of bandage cooperation, through adopting with secondary battery's bulging force and inflation volume assorted clamp plate first surface, the true simulation end plate bears the condition that the module bulging force warp, helps accomplishing the test of end plate intensity fast, helps improving the efficiency of test and the accuracy of assurance test.

Description

End plate strength test device

technical field

The utility model relates to the technical field of battery manufacturing, in particular to an end plate strength testing device.

Background technique

At present, in the development process of the end plate of the module, in order to test the strength of the end plate, that is, to test the ability of the end plate to withstand the expansion force of the secondary battery cell in the module, it is necessary to design and manufacture a module including this end plate , and then carry out the module charge and discharge cycle test, and continue to test until the capacity of the module reaches the end of its life. This method has the following problems: 1. The test takes a very long time, which takes about 1.5 years. There are obvious contradictions between the short import and use period, which does not meet the needs of product development; 2. The verification of the end plate's ability to withstand the expansion force of the module is not sufficient for the introduction of the product, and the grouped modules have end plate ruptures that lead to short circuits Risk; 3. Designing and manufacturing a module including this type of end plate for testing takes a long time of equipment resources, low testing efficiency, and very expensive testing costs.

The existing Chinese patent with publication number CN212871567U discloses a battery module expansion force testing device. The battery module expansion force testing device includes a support assembly, two equivalent end plates, a preloading mechanism and a cover plate, wherein the support assembly includes a base plate surrounded by a bottom plate, a first side plate and a second side plate arranged in parallel. "凵" type accommodation space, the battery module is arranged in the accommodation space; two equivalent end plates are parallel to the first side plate and are respectively arranged at both ends of the battery module, between each equivalent end plate and the battery module A first pressure sensor is provided; the pre-pressing mechanism is connected to the first side plate, and is used to squeeze the equivalent end plate to press the battery module to the second side plate with adjustable pressure; the cover plate is detachably connected to the support The upper side of the assembly is parallel to the bottom plate, and a second pressure sensor is arranged between the cover plate and the battery module.

The inventor believes that the expansion force testing devices in the prior art are all testing devices for batteries, and lack of testing devices for the ability of battery end plates to withstand expansion forces. The existing testing technology is time-consuming and low in testing efficiency. Therefore, it is necessary to provide a The utility model relates to an end plate strength testing device, which is used for testing the ability of the battery end plate to withstand the expansion force of the module.

Utility model content

Aiming at the defects in the prior art, the purpose of this utility model is to provide a device for testing the strength of an end plate.

An end plate strength testing device provided according to the utility model includes a base and a pressure plate; the base includes a support, and the top of the support is recessed downward to form a support fitting surface, and the support fitting 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 tight fitting with the upper surface of the end plate, and the center of the first surface of the pressure plate is aligned with the The center of the upper surface of the end plate is arranged correspondingly; the pressure plate also includes a second surface of the pressure plate opposite to the first surface of the pressure plate, and the second surface of the pressure plate is used for transmitting the load applied by the testing equipment to the end plate.

Preferably, the first surface of the pressing plate includes a downwardly convex arc surface, and the degree of convexity of the arc surface gradually increases from the edge to the center of the first surface of the pressing plate.

Preferably, the maximum height of the protrusion on the first surface of the pressure plate is G, the thickness of the secondary battery cell is H, and 0.35H≥G≥0.002H.

Preferably, the first surface of the pressure plate includes a single hump surface, and the single hump surface forms a hemispherical protrusion downward from the center of the first surface of the pressure plate.

Preferably, the first surface of the pressing plate includes a multi-humped surface, and the multi-humped surface forms a plurality of hemispherical protrusions downward from the first surface of the pressing plate, and the multi-humped surface includes more than two humped surfaces.

Preferably, the support fitting surface includes an arc surface and an avoidance groove, the shape of the arc surface matches the binding area of the strap; the depth of the avoidance groove is no more than 10 times the width of the support fitting surface , and not less than 0.1 times the width of the mating surface of the support.

Preferably, the width of the strap matching area is 0.1-20 mm larger than the width of the supporting member matching surface.

Preferably, the base further includes a mounting seat, and the mounting seat includes 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 supports are correspondingly installed on the mounting base, two sets of strap matching areas are symmetrically arranged on the end plate, and the distance between the two supports is the same as that of the two sets of straps. The distance between strap fit areas is consistent.

Preferably, the thickness of the substrate of the pressing plate ranges from 5 mm to 200 mm.

Compared with the prior art, the utility model has the following beneficial effects:

1. The utility model tests the strength of the end plate by using the base and the pressure plate, adopts the matching surface of the support part that matches the matching area of the strap, and adopts the first pressure plate that matches the expansion force and expansion amount of the secondary battery. On the surface, the actual simulation of the deformation of the end plate under the expansion force of the module helps to quickly complete the test of the strength of the end plate, which helps to improve the efficiency of the test and ensure the accuracy of the test.

2. In the utility model, by setting the matching surface of the supporting part on the supporting part, an arc surface consistent with the arc of the strap matching area is set on the supporting part matching surface, and a space is reserved for the deformation of the middle part of the end plate on the supporting part matching surface. The avoidance groove helps to truly simulate the deformation of the end plate under the expansion force of the module, which helps to improve the efficiency of the test and ensure the accuracy of the test.

3. The utility model is detachable and installed through the mounting seat and the support, and can adjust the installation position of the support, and replace the support that matches the end plate, which helps to improve the versatility of the base, thereby helping to improve the test speed and efficiency.

Description of drawings

Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

Fig. 1 is a schematic diagram of the overall structure of the utility model mainly embodying the end plate strength testing device;

Fig. 2 is a structural schematic diagram of the utility model mainly embodying the base;

Fig. 3 is a structural schematic diagram of the utility model mainly embodying the end plate;

Fig. 4 is the bottom view of the utility model mainly embodying the end plate;

Fig. 5 is the front view of the utility model mainly embodying the pressing plate;

Figure 6 is a top view of the utility model mainly embodying the pressing plate;

Fig. 7 is a front view of the utility model mainly embodying the support member;

Fig. 8 is a top view of the utility model mainly embodying the support member;

Fig. 9 is a schematic diagram of the utility model mainly embodying the shape of the first surface of the pressure plate in Variation 1;

Fig. 10 is a schematic diagram of the utility model mainly embodying the shape of the first surface of the pressure plate in Variation 2;

Fig. 11 is a schematic diagram of the utility model mainly embodying the shape of the first surface of the pressure plate in Variation 3.

Reference signs:

Base 1 Mounting seat 11 Support 12

Support member mating surface 121 arc surface 1211 escape groove 1212

Platen 2 Platen first surface 21 Platen second surface 22

End plate 3 Strap fit area 31

detailed description

The utility model is described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present utility model. These all belong to the protection domain of the present utility model.

Example

As shown in Figures 1-6, an end plate strength testing device provided according to the present invention includes a base 1 and a pressure plate 2; the base 1 includes a support 12, and the top of the support 12 is recessed downward to form a support fitting surface 121, The supporting member mating surface 121 is used to place the strap mating area 31 at the bottom of the end plate 3; the pressing plate 2 includes a first surface 21 of the pressing plate, which is used for tight fitting with the upper surface of the end plate 3, and the first pressing plate The center of the surface 21 is set corresponding to the center of the upper surface of the end plate 3; the pressure plate 2 also includes a second surface 22 of the pressure plate opposite to the first surface 21 of the pressure plate, and the second surface 22 of the pressure plate is used to transmit the load applied by the test equipment to the end plate 3, that is, to simulate the module expansion force exerted by the secondary battery cell on the end plate 3.

In the current development process of the end plate of the module, in order to test the strength of the end plate, that is, to test the performance of the end plate to withstand the expansion force of the secondary battery cell in the module, it is necessary to design and manufacture the module of this type of end plate. The application avoids stacking a real module for long-term cycle verification, and can quickly complete the test verification of the end plate bearing the expansion force of the module, and it is basically consistent with the actual situation, which greatly improves the strength test of the end plate. Efficiency and guaranteed test accuracy.

The first surface 21 of the pressure plate is in tight fit with the upper surface of the end plate 3 for simulating the expansion force exerted by the secondary battery in the module on the end plate 3 . In order to enhance the rigidity of the pressing plate 2 and prevent the deformation of the pressing plate 2, the thickness of the base material of the pressing plate 2 ranges from 5 mm to 200 mm. The size of the first surface 21 of the pressing plate is not smaller than the size of the surface of the secondary battery, preferably, both have the same size, so the pressing plate 2 can more realistically simulate a secondary battery cell.

Because the expansion force is different at different positions of the large surface of the secondary battery, the expansion amount of different positions of the large surface of the secondary battery is also different, so the pressure plate 2 is designed as a structure of unequal thickness, that is, the pressure plate 2 is designed as a variable cross-section structure form, so that the first surface 21 of the pressing plate can more realistically simulate the surface of the secondary battery cell. The expansion force and expansion amount of the secondary battery gradually decrease from the middle of the large surface to the surrounding edges. The first surface 21 of the pressure plate includes a downwardly convex arc surface, and the degree of convexity of the arc surface extends from the edge of the first surface 21 of the pressure plate to The central position gradually increases.

As shown in FIG. 5 , the maximum height of the protrusion on the first surface 21 of the pressing plate is G, and the relationship with the thickness H of the secondary battery cell is 0.35H≥G≥0.002H. When the module is used for charging and discharging for many times, the secondary battery cells in the module expand and generate expansion force. The expansion of the battery cell is between 0.002 times the thickness of the battery cell and 0.35 times the thickness of the battery cell. Therefore, in order to be more The pressure plate is accurately used to simulate the expansion amount and expansion force of the cell, so the relationship between the maximum height G of the protrusion on the first surface 21 of the pressure plate and the thickness H of the secondary battery cell is 0.35H≥G≥0.002H. The first surface 21 of the pressing plate is in the shape of a raised jklmn arc, point l 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 both increase from 0 to G, so as to simulate the expansion of the secondary battery The force and the amount of expansion gradually decrease from the middle of the large surface to the four edges. The shape of the second surface 22 of the pressure plate may include a horizontal plane, or an arc surface, etc., and is not limited in this embodiment, as long as it can transmit the load applied by the testing equipment to the end plate 3 .

The material of the pressing plate 2 is selected from high-hardness materials, such as carbon steel materials, stainless steel materials, hard plastics, stone materials, and the like.

The base 1 includes a mounting seat 11 and a support member 12, the support member 12 is installed on the mounting seat 11, and the number of the support member 12 may be two or more according to the actual usage. The mounting seat 11 and the supporting member 12 are connected as one by bolts and/or welding, or the mounting seat 11 and the supporting member 12 are integrally formed, such as integrally machined or die-casted. In order to increase the versatility of the base 1 and be suitable for testing various types of end plates 3 , preferably, the base 1 is designed as a detachable movable structural part. The mounting base 11 includes a plurality of mounting holes, and the support member 12 can be installed in different positions of the mounting base 11 through different mounting holes, and is connected by bolts to realize installation, disassembly, and position change, which greatly improves the applicability of the base 1 .

The two support members 12 are correspondingly installed on the mounting base 11, and two sets of strap matching areas 31 are symmetrically arranged on the end plate 3, and the distance between the two support members 12 is equal to the distance between the two sets of strap matching areas 31. unanimous.

As shown in FIGS. 7 and 8 , the strap matching area 31 is placed on the supporting member matching surface 121 , the supporting member matching surface 121 includes an arc surface 1211 and an escape groove 1212 , and the shape of the arc surface 1211 matches the strap matching area 31 . Generally, the binding area 31 of the strap is in the shape of an arc, and correspondingly, the arc surface 1211 is also in the shape of an arc, which fully simulates the limit of the strap to the end plate 3 , thereby ensuring the accuracy of the test.

The width of the strap matching area 31 is B, the distance between two groups of strap matching areas 31 is A, the width of the strap is C, and the width of the supporting member matching surface 121 is D. Preferably, C and D are equal, B The value of D is 0.1-20mm larger than the value of D, to achieve the role of strap limit.

Generally, a set of strap matching regions 31 formed by a strap includes two arc surfaces, and correspondingly, the arc surface 1211 includes arc segments abc and fgh, and the arc surface 1211 and the strap fitting region 31 have a large surface form of contact. The avoidance groove 1212 is the cdef groove between the abc and fgh arc sections, the groove depth is E, and the relationship with the width of the strap is: 0.1C≤E≤10C, which is used to prevent the deformation of the middle part of the end plate 3 under test. Leave a space to more realistically simulate the deformation of the end plate 3 under the expansion force of the module.

When this application is used, the distance between the two supports 12 can be adjusted to ensure that it is consistent with the distance between the two sets of strap matching areas 31, so as to truly simulate the situation where the end plate 3 is deformed by the expansion force of the module . It is also possible to directly replace the support member 12 by using an arc surface 1211 with an adapted arc and an escape groove 1212 with an adapted depth. The present application can match end plates 3 of different heights and different forms, which greatly improves the versatility of the base 1 . This application can quickly complete the test and verification of the end plate bearing the expansion force of the module, and it is basically consistent with the actual situation, which greatly improves the efficiency of the end plate strength test and ensures the accuracy of the test.

When the application is tested, it also adopts a test equipment capable of pressurization, including the following steps:

Step S1, placing the base 1 of the end plate strength testing device on the platform of the testing equipment, the pressure range of the testing equipment is preferably 0-100000N;

Step S2, placing the end plate 3 on the support member 12, adjusting the distance between the two support members 12, so that the binding area 31 matches the arc surface 1211;

Step S3, placing the pressing plate 2 on the end plate 3, the center of the first surface 21 of the pressing plate corresponds to the center of the upper surface of the end plate 3;

Step S4, placing the indenter of the test equipment on the center of the second surface 22 of the pressure plate, so that the center of the indenter, the pressure plate 2 and the end plate 3 are on the same vertical line, so that the pressure plate 2 exerts the mold on the end plate 3 The expansion force of the group is consistent with the expansion force of the secondary monomer in the module to the end plate 3;

Step S5, pressurizing the pressure plate 2, the initial pressure is 0N, the pressure threshold value is the maximum expansion force of the battery, and the value range of the pressurization speed is 0.1-450mm/min. Different pressurization speeds simulate the change process of the module expansion force exerted by the module on the end plate 3 under different charging rates and long-term storage conditions, which can be set according to the actual situation.

Regarding the process of test loading, the initial pressure is 0N, and then pressurized at the speed of design V, and the value range of V is 1-100mm/min. There are two ways to cut off the pressure; the first way, the end plate 3 is directly crushed, because the end plate 3 is broken so that the end plate 3 cannot continue to bear the pressure; method 2, according to the maximum expansion force of the secondary battery cell at the end of its life, set the threshold value of the load applied by the test equipment, when the threshold value is reached Just stop trying to add pressure, then check the situation of end plate 3, whether the damage of crackle, debris takes place. If the end plate 3 is broken, it means that the strength of the end plate 3 is not enough; if the end plate 3 is not broken, it means that the strength of the end plate 3 can withstand the expansion force of the internal secondary battery cells of the module, and can be used.

This application simulates the strength test of the end plate, which can be completed in a very short time, and quickly completes the performance verification of the end plate 3 bearing the expansion force of the module. The test device of the present application and its test process take up very short equipment resource time, and greatly reduce the test cost, so that the end plate 3 can be imported into the project after being quickly and fully verified without the risk of rupture, and the rapid development of the project is very useful. great significance.

Variation 1

As shown in Figure 9, based on Example 1, the first surface 21 of the pressing plate can be a horizontally arranged plane in addition to a downwardly convex arc surface. In a possible implementation mode, the material of the pressing plate 2 can be selected from the hardness Compared with the smaller material in Example 1, the deformation of the secondary battery casing in the module can be simulated, so that the expansion of the large surface of the secondary battery at different positions can be simulated, thereby ensuring a more comprehensive simulation and improving the accuracy of the test; In other possible implementation manners, the pressing plate 2 may also be made of the same material as that in Embodiment 1.

Variation 2

As shown in Figure 10, based on Embodiment 1, the first surface 21 of the pressure plate can be a single hump surface in addition to a downwardly convex arc surface, and the single hump surface forms a hemispherical shape downward from the center of the first surface 21 of the pressure plate. The bulge is used to simulate the expansion of different positions on the large surface of the secondary battery, so as to ensure a more comprehensive simulation and improve the accuracy of the test.

Variation 3

As shown in Figure 11, based on Embodiment 1, the first surface 21 of the pressure plate can be a multi-hump surface in addition to a downwardly convex arc surface, wherein the multi-hump surface includes more than two hump surfaces, the embodiment of the present application There is no specific limit to the number of hump surfaces. When the multi-hump surface includes two hump surfaces, that is, double hump surfaces, the double hump surfaces form two hemispherical protrusions symmetrically downward from the first surface 21 of the pressure plate to simulate The expansion of different positions on the large surface of the secondary battery ensures a more comprehensive simulation and improves the accuracy of the test.

Further, the first surface 21 of the pressing plate can also be more than 3 humped surfaces, and more than 3 hemispherical protrusions are formed downward from the first surface 21 of the pressing plate. The embodiment of the present application does not specifically limit the number of humped surfaces. The number of humped surfaces is consistent with the number of hemispherical protrusions formed downward from the first surface 21 of the pressure plate. In addition, the heights of the hemispherical protrusions formed by the plurality of humped surfaces may be uniform or non-uniform. In a possible implementation manner, the hump surface may include a first hump surface set from the center of the first surface 21 of the pressure plate, and a plurality of second hump surfaces are set with the first hump surface as the center and a set distance as the radius. The circumference of the hump is set as a circle, wherein the height of the downward protrusion of the first hump is greater than the thickness of the downward protrusion of the second hump. In other possible embodiments, it may also include a plurality of third hump surfaces, a plurality of fourth hump surfaces, etc., which are sequentially arranged on the first surface 21 of the self-pressing plate with the center position as the center, and the height of the protrusions is successively The embodiment of the present application is only used as an example, and is not limited thereto. For example, a plurality of second hump surfaces, third hump surfaces, etc. can also be formed into other shapes, such as a square, a regular polygon, a five-pointed star, and the like.

working principle

Place the base 1 of the end plate strength test device on the platform of the test equipment, the pressure range of the test equipment is preferably 0-100000N; place the end plate 3 on the support 12, and adjust the distance between the two supports 12 , so that the strap matching area 31 is matched with the arc surface 1211; the pressure plate 2 is placed on the end plate 3, and the center of the first surface 21 of the pressure plate corresponds to the center of the upper surface of the end plate 3; the indenter of the test equipment is placed on the pressure plate The center position of the second surface 22 makes the center of the pressure head, the pressure plate 2 and the end plate 3 be on the same vertical line, so that the expansion force of the module exerted by the pressure plate 2 on the end plate 3 is the same as that of the secondary monomer in the module. The way of the expansion force of the end plate 3 is consistent; pressurize the pressure plate 2, the initial pressure is 0N, the pressure threshold value is the maximum expansion force of the battery, and the value range of the pressurization speed is 0.1-450mm/min. If the end plate 3 is broken, it means that the strength of the end plate 3 is not enough; if the end plate 3 is not broken, it means that the strength of the end plate 3 can withstand the expansion force of the internal secondary battery cells of the module, and can be used.

In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, rather than indicating or implying the referred device Or elements must have a certain orientation, be constructed and operate in a certain orientation, and thus should not be construed as limiting the application.

The specific embodiments of the present utility model have been described above. It should be understood that the utility model is not limited to the above-mentioned specific embodiments, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the utility model. In the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims (10)

1. The end plate strength testing device is characterized by comprising 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 platen (2) further comprises a platen second surface (22) opposite the platen first surface (21), the platen second surface (22) for transferring a load applied by a test apparatus to the end plate (3).

2. The end plate strength testing apparatus of claim 1, wherein the pressing plate first surface (21) includes a downwardly convex curved surface, and a degree of convexity of the curved surface increases from an edge to a center of the pressing plate first surface (21).

3. The end plate strength testing device according to claim 2, wherein the maximum height of the protrusions on the first surface (21) of the pressing plate is G, the thickness of the secondary battery cell is H, and 0.35H ≧ G ≧ 0.002H.

4. The end plate strength testing apparatus of claim 1, wherein the platen first surface (21) includes a single hump surface forming a hemispherical protrusion downward from a central position of the platen first surface (21).

5. The end plate strength testing apparatus of claim 1, wherein the platen first surface (21) includes a hump surface forming a plurality of hemispherical protrusions downward from the platen first surface (21), the hump surface including more than two hump surfaces.

6. The end plate strength testing apparatus according to claim 1, wherein the support member engagement surface (121) includes an arc surface (1211) and an escape groove (1212), the arc surface (1211) being shaped to match the strap engagement region (31);

the depth of the avoiding groove (1212) is not more than 10 times the width of the support fitting surface (121), and is not less than 0.1 time the width of the support fitting surface (121).

7. The end plate strength testing device according to claim 1, wherein the width of the strap engagement area (31) is 0.1 to 20mm larger than the width of the support engagement surface (121).

8. The end plate strength testing device according to claim 1, wherein the base (1) further comprises a mounting seat (11), the mounting seat (11) comprises a plurality of mounting holes, and the supporting member (12) can be mounted at different positions of the mounting seat (11) through different mounting holes.

9. The end plate strength testing apparatus according to claim 8, wherein two of said supporting members (12) are correspondingly mounted on said mounting seat (11), two sets of said strap engaging regions (31) are symmetrically provided on said end plate (3), and a distance between two of said supporting members (12) is identical to a distance between two sets of said strap engaging regions (31).

10. The end plate strength testing device according to claim 1, wherein the thickness of the base material of the pressure plate (2) ranges from 5 to 200mm.

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