Breakage strength testing tool for cylindrical power battery shell

Abstract

The utility model discloses a tool for testing the breaking strength of a cylindrical power battery shell, which comprises a first connecting rod, a first conical part, an accommodating device, a second connecting rod, a second conical part and a base, the lower end of the first connecting rod is connected with the first conical part, and the upper end of the second connecting rod is connected with the second conical part; and the lower end of the second connecting rod is fixedly arranged on the base. Through the above mode, the device can achieve the independent detection of the breaking strength of the cylindrical power battery housing, does not need to weld a cover plate on the cylindrical power battery housing, reduces the waste of a cover plate material, is simple and convenient to operate, can improve the testing efficiency, improves the judgment level of the impact strength of the housing material, and is suitable for popularization and application. And the use safety of the finished battery pack transported to a terminal client is better ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of battery shell strength testing, in particular to a bursting strength testing tool for a cylindrical power battery shell. Background Art

[0002] Cylindrical power batteries are batteries with high capacity, long cycle life, and a wide range of ambient temperatures. They usually include a battery cell and a shell. During the production process of cylindrical power batteries, it is necessary to test the burst (compression) strength of the cylindrical power battery shell to ensure the safe use of the cylindrical power battery. The existing method for testing the cylindrical power battery shell is usually to simulate the compression test using air pressure. During the test, it is necessary to weld a cover plate to the upper opening of the shell before the shell can be safely tested for its compression strength. It is not possible to independently test the shell's impact strength, which will cause a waste of cover plate materials and affect the test efficiency. Utility Model Content

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies in the prior art, the utility model provides a bursting strength testing tool for a cylindrical power battery casing, which can solve the above-mentioned technical problems.

[0005] (II) Technical solution

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions: a bursting strength test tool for a cylindrical power battery housing, comprising: a first connecting rod, a first conical member, a receiving device, a second connecting rod, a second conical member and a base, the lower end of the first connecting rod is connected to the first conical member, the upper end of the second connecting rod is connected to the second conical member, and the lower end of the second connecting rod is fixedly arranged on the base;

[0007] The receiving device is provided with a first conical opening, a cylindrical through hole and a second conical opening which are connected from top to bottom. The second conical member is clamped in the second conical opening. The upper end face of the second conical member is circular. The upper end face of the second conical member is sealed to the lower end of the cylindrical through hole to form a cylindrical receiving cavity. The depth of the cylindrical receiving cavity is less than the height of the cylindrical power battery shell. The lower end face of the first conical member is circular and its area is larger than the upper end opening of the cylindrical power battery shell. The receiving device is provided with a horizontal through hole connected with the cylindrical through hole. A convex conical nail is provided in the horizontal through hole. The top end of the convex conical nail passes through the horizontal through hole and is exposed in the cylindrical through hole.

[0008] Preferably, the receiving device includes three unit components with the same structure, and the three unit components are assembled and combined to form the receiving device.

[0009] Preferably, each of the three unit elements is provided with a horizontal through hole.

[0010] Preferably, grooves are provided on the upper and lower parts of the receiving device, and rubber bands are provided in the grooves.

[0011] Preferably, the first connecting rod and the second connecting rod are both screw rods.

[0012] Preferably, the diameter of the top end of the convex conical nail is 1 mm.

[0013] (III) Beneficial effects

[0014] Compared with the prior art, the utility model provides a bursting strength testing tool for a cylindrical power battery shell, which has the following beneficial effects: the utility model is provided with a cylindrical accommodating cavity for accommodating a cylindrical power battery shell, and the upper end opening of the cylindrical power battery shell is covered by the lower end surface of the first conical member. During the bursting strength test, the cylindrical power battery shell is squeezed downward by the first conical member, and finally the deformation of the shell is observed. In the above manner, the utility model can independently detect the bursting strength of the cylindrical power battery shell, without the need to first weld a cover plate on the cylindrical power battery shell, thereby reducing the waste of cover plate materials, and is easy to operate, which can improve the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a three-dimensional diagram of a bursting strength test tool for a cylindrical power battery shell of the utility model;

[0016] Figure 2 It is a three-dimensional diagram of the first connecting rod and the first conical member of the utility model;

[0017] Figure 3 It is a first stereoscopic view of the receiving device of the utility model;

[0018] Figure 4 It is a three-dimensional diagram of the second connecting rod, the second conical member and the two unit members of the utility model;

[0019] Figure 5 It is a second stereoscopic view of the receiving device of the utility model;

[0020] Figure 6 It is a three-dimensional diagram of the second connecting rod and the second conical member of the utility model;

[0021] Figure 7 It is a three-dimensional diagram of a unit element of the utility model.

[0022] The numbers in the figure are: 1 first connecting rod, 2 first conical member, 3 receiving device, 4 second connecting rod, 5 second conical member, 6 first conical opening, 7 cylindrical through hole, 8 horizontal through hole, 9 unit member, 10 groove, 11 cylindrical receiving cavity. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] The utility model provides a bursting strength test tool for a cylindrical power battery housing, comprising: a first connecting rod 1, a first conical member 2, a receiving device 3, a second connecting rod 4, a second conical member 5 and a base (not shown). The lower end of the first connecting rod 1 is connected to the first conical member 2, the upper end of the second connecting rod 4 is connected to the second conical member 5, and the lower end of the second connecting rod 4 is fixedly arranged on the base.

[0025] The receiving device 3 is provided with a first conical opening 6, a cylindrical through hole 7 and a second conical opening which are connected from top to bottom. The second conical member 5 is clamped in the second conical opening. The upper end surface of the second conical member 5 is circular. The upper end surface of the second conical member 5 is sealed to the lower end of the cylindrical through hole 7 to form a cylindrical receiving cavity 11. The depth of the cylindrical receiving cavity 11 is less than the height of the cylindrical power battery shell. The lower end surface of the first conical member 2 is circular and its area is larger than the upper end opening of the cylindrical power battery shell. The receiving device 3 is provided with a horizontal through hole 8 connected with the cylindrical through hole 7. A convex conical nail is provided in the horizontal through hole 8. The top end of the convex conical nail (i.e., the inner side of the convex conical nail) passes through the horizontal through hole 8 and is exposed in the cylindrical through hole 7.

[0026] The diameter of the cylindrical receiving cavity 11 is slightly larger than the diameter of the cylindrical power battery housing. When the utility model is not in use, the first cone member 2 is placed in the first cone opening 6 . When the utility model is used to perform a strength test on the shell, the first connecting rod 1 and the first conical member 2 are first taken out, and then the cylindrical power battery shell is placed in the cylindrical receiving cavity 11, wherein the cylindrical power battery shell is partially exposed from the cylindrical receiving cavity 11, and the top end of the convex conical nail is in contact with the outer wall of the cylindrical power battery shell; further, the lower end surface of the first conical member 2 is covered on the upper end opening of the cylindrical power battery shell; by operating the first connecting rod 1, the lower end surface of the first conical member 2 is made to press the cylindrical power battery shell downward to perform a bursting strength test on the cylindrical power battery shell, and the convex conical nail is a force point during the test; after a period of squeezing, the cylindrical power battery shell is taken out from the receiving device 3, and the deformation of the outer wall of the cylindrical power battery shell and whether it is punctured are observed to determine whether the cylindrical power battery shell meets the shell strength requirements.

[0027] In this embodiment, the receiving device 3 includes three unit components 9 of the same structure, and the three unit components 9 are assembled to form the receiving device 3. Each of the three unit components 9 is provided with a horizontal through hole 8, and each horizontal through hole 8 is provided with a convex conical nail. In addition, the upper and lower parts of the receiving device 3 are provided with a groove 10, and a plurality of rubber bands are provided in the groove 10 to enhance the stability of the receiving device 3. Of course, in other embodiments, the receiving device 3 can also adopt an integrally formed structure, which is not too much limited here.

[0028] Preferably, the first connecting rod 1 and the second connecting rod 4 are both screws, so as to facilitate the connection and disassembly of the first connecting rod 1 and the first conical member 2, and the connection and disassembly of the second connecting rod 4 and the second conical member 5 and the base. In addition, the top diameter of the convex conical nail is preferably 1 mm, so as to better judge the test results of the cylindrical power battery housing.

[0029] Compared with the prior art, the utility model provides a bursting strength testing tool for a cylindrical power battery shell, which has the following beneficial effects: the utility model is provided with a cylindrical accommodating cavity for accommodating a cylindrical power battery shell, and the upper end opening of the cylindrical power battery shell is covered by the lower end surface of the first conical member. During the bursting strength test, the cylindrical power battery shell is squeezed downward by the first conical member, and finally the deformation of the shell is observed. In the above manner, the utility model can independently detect the bursting strength of the cylindrical power battery shell, without the need to first weld a cover plate on the cylindrical power battery shell, thereby reducing the waste of cover plate materials, and is easy to operate, which can improve the test efficiency.

[0030] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bursting strength test tool for a cylindrical power battery housing, characterized in that: include: A first connecting rod, a first conical member, a receiving device, a second connecting rod, a second conical member and a base, wherein the lower end of the first connecting rod is connected to the first conical member, the upper end of the second connecting rod is connected to the second conical member, and the lower end of the second connecting rod is fixedly disposed on the base; The receiving device is provided with a first conical opening, a cylindrical through hole and a second conical opening which are connected from top to bottom. The second conical member is clamped in the second conical opening. The upper end surface of the second conical member is circular. The upper end surface of the second conical member is sealed to the lower end of the cylindrical through hole to form a cylindrical receiving cavity. The depth of the cylindrical receiving cavity is less than the height of the cylindrical power battery shell. The lower end surface of the first conical member is circular and its area is larger than the upper end opening of the cylindrical power battery shell. The receiving device is provided with a horizontal through hole which is connected with the cylindrical through hole. A convex conical nail is provided in the horizontal through hole. The top end of the convex conical nail passes through the horizontal through hole and is exposed in the cylindrical through hole.

2. The bursting strength testing tool for cylindrical power battery housing according to claim 1, characterized in that: The receiving device comprises three unit components with the same structure, and the three unit components are assembled and combined to form the receiving device.

3. The bursting strength testing tool for cylindrical power battery housing according to claim 2, characterized in that: Each of the three unit elements is provided with a horizontal through hole.

4. The bursting strength testing tool for cylindrical power battery housing according to claim 2, characterized in that: The upper part and the lower part of the receiving device are both provided with grooves, and rubber bands are arranged in the grooves.

5. The bursting strength testing tool for cylindrical power battery casing according to claim 1, characterized in that: The first connecting rod and the second connecting rod are both screw rods.

6. The bursting strength testing tool for cylindrical power battery casing according to claim 1, characterized in that: The top diameter of the convex conical nail is 1 mm.

Images