Power battery pack extrusion test tool

Abstract

The utility model provides a power battery pack extrusion test tool, which comprises a first limiting plate, a second limiting plate, a limiting frame and a push plate, and is characterized in that the first limiting plate and the second limiting plate are relatively fixed, and a battery pack is accommodated between the first limiting plate and the second limiting plate; the limiting frame and the push plate are oppositely arranged on the two sides of the first limiting plate, and an avoiding groove is formed in the position, corresponding to the middle space of the first limiting plate and the second limiting plate, of the limiting frame. The push plate is arranged on the other side of the first limiting plate and used for applying pressure to the battery pack. By arranging the first limiting plate and the second limiting plate, the battery pack can be clamped and fixed, meanwhile, a lifting lug of the battery pack can be inserted into an avoiding groove of a limiting clamp so that the side edge of the battery pack can be completely attached to the limiting frame, and therefore when extrusion force is applied through the push plate, the battery pack is evenly stressed, the edge warping problem cannot occur, and the service life of the battery pack is prolonged. Therefore, the extrusion force can be stably applied, and the extrusion test can be smoothly completed.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a power battery pack extrusion test tool. Background Art

[0002] The battery pack compression test is an important safety test method used to evaluate the safety and performance of the battery pack when subjected to mechanical compression. It is usually used in lithium-ion battery packs in applications such as electric vehicles, power tools, and energy storage systems to ensure their safety in actual use and accident situations. In particular, the safety of battery packs in new energy vehicles is of great significance to ensuring the personal and property safety of drivers and passengers, and the relevant tests are particularly strict.

[0003] When the existing power battery pack is subjected to the extrusion test, taking GB38031 as an example, the battery pack is generally extruded with a semi-cylinder with a radius of 75mm and a length of no more than 1m, and the extrusion is stopped when the extrusion force reaches 100kN or the extrusion deformation reaches 30% of the overall size in the extrusion direction. The force-bearing surface of some battery packs with hanging ears is relatively flat, and they can be directly placed on the extrusion table for extrusion. However, for battery packs with uneven force-bearing surfaces of some hanging ears, it is necessary to design appropriate battery pack extrusion tooling, otherwise the battery pack will be warped during extrusion and the extrusion force will not be able to be increased, which will lead to distortion and failure of the extrusion test.

[0004] The existing utility model patent with authorization announcement number CN208313570U discloses a battery pack and its extrusion tooling, which can maximize the simulation of the battery pack loading state and improve the accuracy of the extrusion test. The extrusion tooling of the utility model includes a fixed beam and a compression plate, the fixed beam is fixedly connected to one side of the battery pack in a detachable manner, the compression plate is connected to the end of the fixed beam in front of the extrusion direction, and the fixed beam is also provided with a hoisting member.

[0005] As in the above technical solution, the battery pack is limited by fixing beams and top blocks, but this tooling can only limit the sides of the battery pack, and the large surface of the battery pack lacks corresponding fixing components. When performing extrusion testing technology, due to the small limiting area, the local force on the battery pack will be too large, which may easily cause damage to the box connection at the edge of the battery pack, and cannot truly reflect the overall anti-extrusion ability of the battery pack. In addition, since the edges of the battery pack are usually provided with lifting ears, the battery pack is limited only by side fixing. During testing, problems such as warping of the edges and bulging of the middle part of the battery pack caused by the lifting ears may occur, resulting in test distortion. Utility Model Content

[0006] In view of this, the utility model proposes a power battery pack extrusion test tool that can achieve good positioning of the battery pack and less distorted testing, thereby solving the problem of small limiting area and easy distortion of testing of existing test tools.

[0007] The technical solution of the utility model is implemented as follows: The utility model provides a power battery pack extrusion test tool, including a first limit plate, a second limit plate, a limit frame and a push plate, wherein:

[0008] The first limiting plate is relatively fixed to the second limiting plate, and the battery pack is accommodated between the first limiting plate and the second limiting plate;

[0009] The limiting frame and the push plate are arranged on both sides of the first limiting plate opposite to each other, and the limiting frame is provided with an avoidance groove in the middle space corresponding to the first limiting plate and the second limiting plate;

[0010] The push plate is arranged on the other side of the first limiting plate and is used to apply pressure to the battery pack.

[0011] On the basis of the above technical solution, preferably, a locking member is further included, the locking member includes a base, a connecting rod and a nut, wherein:

[0012] The base is arranged on the first limiting plate;

[0013] One end of the connecting rod is connected to the base, and the other end passes through the second limiting plate and is connected to the nut.

[0014] On the basis of the above technical solution, preferably, a plurality of locking members are provided, and the plurality of locking members are arranged in two rows between the first limiting plate and the second limiting plate, and the battery pack is arranged between the two rows of locking members.

[0015] On the basis of the above technical solution, preferably, the base and the first limiting plate are fixedly connected by bolts to form a detachable structure.

[0016] On the basis of the above technical solution, preferably, the limiting frame includes a plurality of limiting plates, the plurality of limiting plates are connected to form a rectangular frame structure, and the avoidance grooves are provided on the limiting plates.

[0017] On the basis of the above technical solution, preferably, at least two limiting plates of the limiting frame are provided with avoidance grooves.

[0018] On the basis of the above technical solution, preferably, the push plate is a semi-cylinder, and the arc surface of the push plate faces between the first limit plate and the second limit plate.

[0019] On the basis of the above technical solution, preferably, it further comprises a lifting lug, which is arranged on the second limiting plate.

[0020] On the basis of the above technical solution, preferably, bolt holes are provided on the first limit plate and on the bottom surface of the limit frame, and the bolt holes are countersunk holes for installing bolts to connect the extrusion test bench.

[0021] On the basis of the above technical solution, preferably, the first limiting plate and the second limiting plate are arranged in parallel.

[0022] The power battery pack extrusion test tool of the utility model has the following beneficial effects compared with the prior art:

[0023] (1) By setting the first limiting plate and the second limiting plate, the battery pack can be clamped and fixed, and the lifting ear of the battery pack will be inserted into the avoidance groove of the limiting clamp, so that the side of the battery pack is completely attached to the limiting frame. In this way, when the extrusion force is applied by the push plate, the battery pack is evenly stressed and there will be no warping problem, so as to ensure that the extrusion force can be applied stably, thereby successfully completing the extrusion test;

[0024] (2) The first limit plate and the second limit plate are fixed by a locking member, and the locking member is connected and fixed to the limit plate by a connecting rod and a bolt. In this way, after loosening the bolt, the battery pack can be pulled out from between the first limit plate and the second limit plate, which is convenient for reversing and thus conducting the next test;

[0025] (3) The limit frame is composed of multiple limit plates, and at least two limit plates of the limit frame are provided with avoidance grooves, so that it can adapt to the limit work of the lifting ears on different sides of the battery pack to improve the detection range; at the same time, since the limit frame is composed of limit plates, the limit plates can be replaced according to the battery pack structure, so that the limit plates can correspond to the shape of the battery pack, and the avoidance grooves can correspond to the lifting ears of the battery pack, further improving the application range of this tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A three-dimensional diagram of the power battery pack extrusion test tooling of the utility model;

[0028] Figure 2 For the utility model Figure 1 A magnified view of the structure at point A;

[0029] Figure 3 This is a three-dimensional diagram of the application state of the power battery pack extrusion test tooling of the utility model;

[0030] Figure 4 This is a front view of the application state of the power battery pack extrusion test tooling of the utility model;

[0031] Figure 5 A three-dimensional diagram of a limit frame of a power battery pack extrusion test fixture of the utility model;

[0032] Figure 6 is a three-dimensional diagram of a battery pack;

[0033] In the figure: 1. first limit plate; 2. second limit plate; 3. limit frame; 31. limit plate; 301. avoidance groove; 4. push plate; 5. locking member; 51. base; 52. connecting rod; 53. nut; 6. lifting ear; 100. battery pack. DETAILED DESCRIPTION

[0034] The following will be combined with the implementation of the utility model to clearly and completely describe the technical solutions in the implementation of the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] like Figures 1 to 6 As shown, the power battery pack extrusion test fixture of the present invention includes a first limiting plate 1, a second limiting plate 2, a limiting frame 3, a push plate 4, a locking member 5 and a lifting ear 6; it is used for the extrusion test of the battery pack 100.

[0036] The first limiting plate 1 is relatively fixed to the second limiting plate 2, and the battery pack 100 is accommodated between the first limiting plate 1 and the second limiting plate 2; the limiting frame 3 and the push plate 4 are relatively arranged on both sides of the first limiting plate 1, and the limiting frame 3 is provided with an avoidance groove 301 corresponding to the middle space of the first limiting plate 1 and the second limiting plate 2; the push plate 4 is arranged on the other side of the first limiting plate 1, and is used to apply pressure to the battery pack;

[0037] like Figures 1 to 4 As shown, when the extrusion test fixture is used, the battery pack 100 is placed between the first limiting plate 1 and the second limiting plate 2 to clamp and fix the battery pack 100 from the large surface. At the same time, the lifting ear on the side of the battery pack 100 is inserted into the avoidance groove 301 of the limiting frame 3, so that one side of the battery pack 100 can be completely against the limiting frame 3, and then the push plate 4 is connected to the power member, and the push plate 4 is pushed by the power member to move until it is against the battery pack 100, so as to apply an extrusion force to the battery pack 100, thereby completing the extrusion test work;

[0038] As in the above structure, by setting the avoidance groove 301, it is possible to limit the side ears of the battery pack 100, and then limit the entire battery pack 100, thereby ensuring that the battery pack 100 is subjected to uniform force during the extrusion test.

[0039] like Figure 2 As shown, the locking member 5 includes a base 51, a connecting rod 52 and a nut 53, wherein the base 51 is arranged on the first limiting plate 1; one end of the connecting rod 52 is connected to the base 51, and the other end passes through the second limiting plate 2 and is connected to the nut 53;

[0040] As in the above structure, when the first limiting plate 1 and the second limiting plate 2 are set, they are fixed by the locking member 5; specifically, the base 51 of the locking member 5 is first locked and fixed with the first limiting plate 1 by fasteners such as bolts, and then the connecting rod 52 of the locking member 5 is passed through the second limiting plate 2 and connected with the nut 53 to lock and fix;

[0041] The connecting rod 52 is configured as a stepped shaft structure, and the small diameter section of the connecting rod 52 passes through the second limiting plate 2, so that the second limiting plate 2 can be supported to prevent the second limiting plate 2 from being attached to the first limiting plate 1, thereby facilitating the battery pack 100 to be pushed between the first limiting plate 1 and the second limiting plate 2, and also facilitating the battery pack 100 to be taken out for reversing work;

[0042] Specifically, the small diameter section of the connecting rod 52 is provided with threads for connecting the nut 53 .

[0043] At the same time, the base 51 is fixedly connected to the first limiting plate 1 by bolts to form a detachable structure, which facilitates the disassembly and replacement of the locking member 5 and also facilitates the assembly of the extrusion tooling.

[0044] Specifically, the locking members 5 are provided in plurality, and two rows of the locking members 5 are provided between the first limiting plate 1 and the second limiting plate 2, and the battery pack 100 is provided between the two rows of locking members 5;

[0045] As in the above structure, the locking members 5 are arranged side by side, which leaves a channel between the first limiting plate 1 and the second limiting plate 2, making it convenient to push in and pull out the battery pack 100.

[0046] like Figure 5 As shown, the limiting frame 3 includes a plurality of limiting plates 31, and the plurality of limiting plates 31 are connected to form a rectangular frame structure, and the avoidance groove 301 is opened on the limiting plates 31;

[0047] As shown in the above structure, the limit frame 3 adopts an assembled structure, which is composed of a plurality of limit plates 31. Therefore, it is convenient to disassemble and replace the limit plates 31 with avoidance grooves 301 to adapt to battery packs 100 with different lifting ear settings, thereby improving the application range of the extrusion tooling.

[0048] Specifically, the limiting frame 3 has at least two limiting plates 31 with avoidance grooves 301;

[0049] like Figure 6As shown, the battery pack 100 is provided with lifting ears on its side, wherein two sides each have one lifting ear, and the other two sides each have two lifting ears, so the fixed structure of the limiting frame 3 cannot meet the extrusion requirements of the battery pack 100 in different directions, but after the avoidance grooves 301 are provided on the two limiting plates 31 of the limiting frame 3, the limiting frame 3 can be rotated and reversed so that the avoidance grooves 301 match the lifting ear structure of the battery pack 100;

[0050] In some application scenarios, a plurality of avoidance grooves 301 are provided on the same limiting plate 31 to accommodate the lifting ears on different sides of the battery pack 100. This structure has high strength requirements for the limiting plate 31, so preferably, the avoidance grooves 301 are provided on different limiting plates 31 to avoid too many avoidance grooves 301 on the same limiting plate 31 affecting the structural strength.

[0051] like Figure 1 and Figure 4 As shown, the push plate 4 is a semi-cylindrical body, and the arc surface of the push plate 4 faces between the first limiting plate 1 and the second limiting plate 2;

[0052] As in the above structure, by setting the push plate 4 as a semi-cylinder, it can better apply a top force to the lifting ear of the battery pack 100. Since the other side of the push plate 4 is a plane, it is convenient to connect the power member to provide extrusion force;

[0053] Specifically, the power member may be an electric push rod, a hydraulic cylinder or the like.

[0054] like Figure 1 As shown, the lifting lug 6 is arranged on the second limiting plate 2;

[0055] As in the above structure, the extrusion tooling can be conveniently lifted and moved by the lifting lug 6, so that the tooling can be conveniently changed.

[0056] like Figure 1 As shown, bolt holes are provided on the first limit plate 1 and the bottom surface of the limit frame 3, and the bolt holes are countersunk holes for installing bolts to connect the extrusion test bench;

[0057] As in the above structure, in specific application, the tooling is installed on an extrusion test bench, so the tooling needs to be fixed to the extrusion test bench. At this time, bolts are passed through the first limit plate 1 and fixed to the extrusion test bench, and the limit frame 3 is also fixed to the extrusion test bench by bolts;

[0058] In order to prevent the bolts from protruding and interfering with the battery pack 100 , the bolt holes are configured as countersunk holes.

[0059] Specifically, in order to facilitate the lifting of the tooling on the extrusion test bench, lifting ears 6 are also provided on the limiting frame 3 and the first limiting plate 1 .

[0060] Specifically, the first limiting plate 1 and the second limiting plate 2 are arranged in parallel; in this way, the two large surfaces of the battery pack 100 can be clamped and fixed. Of course, some battery packs 100 have special-shaped structures, and the top surface will have local protrusions, but the bottom surface is a flat structure. At this time, the shape of the second limiting plate 2 can be adjusted according to the specific structure of the battery pack 100.

[0061] Specific implementation steps:

[0062] First, the first limit plate 1 and the limit frame 3 are hoisted onto the extrusion test bench, and then the second limit plate 2 is connected to the first limit plate 1 through the locking member 5. At this time, the nut 53 is not tightened. Then, the battery pack 100 is pushed between the first limit plate 1 and the second limit plate 2, and the side ears of the battery pack 100 are inserted into the avoidance groove 301 until the battery pack 100 is against the limit frame 3. Then, the nut 53 is tightened, and finally, the push plate 4 is pushed by the power member to move, and an extrusion force is applied to the battery pack 100 for testing;

[0063] After the test is completed, loosen the nut 53, pull out the battery pack 100, turn the direction, and push it back into the tooling for testing. In this way, the extrusion test of the battery pack 100 in the X and Y directions is completed;

[0064] During testing, if the avoidance grooves 301 are opened on different limiting plates 31 , the limiting frame 3 can be adjusted synchronously so that the avoidance grooves 301 correspond to the lifting ears of the battery pack 100 .

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A power battery pack extrusion test tool, characterized by: It comprises a first limiting plate (1), a second limiting plate (2), a limiting frame (3) and a push plate (4), wherein: The first limiting plate (1) and the second limiting plate (2) are relatively fixed, and the first limiting plate (1) and the second limiting plate (2) are used to accommodate the battery pack (100); The limiting frame (3) and the pushing plate (4) are arranged on both sides of the first limiting plate (1) opposite to each other, and the limiting frame (3) is provided with an avoidance groove (301) corresponding to the middle space between the first limiting plate (1) and the second limiting plate (2); The push plate (4) is arranged on the other side of the first limiting plate (1) and is used to apply pressure to the battery pack.

2. The power battery pack extrusion test fixture according to claim 1, characterized in that: It also includes a locking member (5), the locking member (5) including a base (51), a connecting rod (52) and a nut (53), wherein: The base (51) is arranged on the first limiting plate (1); One end of the connecting rod (52) is connected to the base (51), and the other end passes through the second limiting plate (2) and is connected to the nut (53).

3. The power battery pack extrusion test fixture according to claim 2, characterized in that: The locking members (5) are arranged in plurality, and the locking members (5) are arranged in two rows between the first limiting plate (1) and the second limiting plate (2), and the battery pack (100) is arranged between the two rows of locking members (5).

4. The power battery pack extrusion test fixture according to claim 2, characterized in that: The base (51) and the first limiting plate (1) are fixedly connected via bolts to form a detachable structure.

5. The power battery pack extrusion test fixture according to claim 1, characterized in that: The limiting frame (3) comprises a plurality of limiting plates (31), the plurality of limiting plates (31) are connected to form a rectangular frame structure, and the avoidance groove (301) is provided on the limiting plates (31).

6. The power battery pack extrusion test fixture according to claim 5, characterized in that: The avoidance grooves (301) are formed on at least two of the limit plates (31) of the limit frame (3).

7. The power battery pack extrusion test fixture according to any one of claims 1 to 6, characterized in that: The push plate (4) is a semi-cylinder, and the arc surface of the push plate (4) faces between the first limiting plate (1) and the second limiting plate (2).

8. The power battery pack extrusion test fixture according to any one of claims 1 to 6, characterized in that: It also comprises a lifting ear (6), wherein the lifting ear (6) is arranged on the second limiting plate (2).

9. The power battery pack extrusion test fixture according to any one of claims 1 to 6, characterized in that: Bolt holes are provided on the first limiting plate (1) and on the bottom surface of the limiting frame (3), and the bolt holes are countersunk holes for installing bolts to connect the extrusion test bench.

10. The power battery pack extrusion test tool according to any one of claims 1 to 6, characterized in that: The first limiting plate (1) and the second limiting plate (2) are arranged in parallel.

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