Tool for pressing test of battery case

Abstract

The utility model discloses a tool used for a battery shell pressure test, comprising a pressure joint, the pressure joint comprises a main body part and a protruding part used for being inserted into a battery shell which are connected with each other, the peripheral side wall of the protruding part is provided with a sealing ring used for abutting against the inner wall of the battery shell, the pressure joint is also provided with an air hole, and the air hole is communicated with the main body part; the air hole penetrates through the main body part and the lug boss; the lantern ring is used for being arranged outside the battery shell in a sleeving mode, and the lantern ring is matched with the protruding part so as to be used for clamping the battery shell. The tool provided by the utility model is high in sealing performance, is convenient to assemble, and can complete the pressing test of the battery case more quickly and accurately.

Description

Technical Field

[0001] The utility model relates to the technical field of battery shell testing, in particular to a tooling for battery shell pressure testing. Background Art

[0002] With the rapid development of batteries, the requirements for battery energy density and safety are becoming higher and higher. When the electrolyte in the battery cell undergoes a chemical reaction, gas will be generated. When the gas pressure reaches a certain value, there may be a risk of explosion. If the battery shell does not have enough carrying capacity, it will rupture.

[0003] Therefore, it is necessary to test the load-bearing capacity of the battery shell in order to predict the risk in advance. In the existing battery shell pressure test fixture, the end face of the battery shell to be tested is generally sealed by applying pressure at both ends during the pressure test. This type of fixture is not airtight and is prone to air leakage, resulting in inaccurate test results. Utility Model Content

[0004] In order to overcome at least one of the defects of the prior art described above, the utility model provides a tool for battery shell pressure testing, which has high sealing performance, is easy to assemble, and can complete the battery shell pressure test more quickly and accurately.

[0005] The technical solution adopted by the utility model to solve the problem is:

[0006] A tool for battery shell pressure testing, comprising:

[0007] The pressing joint comprises a main body and a protrusion for inserting into the battery shell, the outer peripheral side wall of the protrusion is provided with a sealing ring for abutting against the inner wall of the battery shell, and the pressing joint is also provided with an air hole, which passes through the main body and the protrusion;

[0008] The sleeve ring is used to be sleeved outside the battery shell, and the sleeve ring cooperates with the protruding portion to clamp the battery shell.

[0009] The tooling for battery shell pressure testing provided by the utility model utilizes the sealing ring on the outer peripheral side wall of the protrusion to abut against the inner wall of the battery shell to achieve inner sealing when the battery shell is pressurized and inflated, and the battery shell cannot be separated from the tooling through the interaction between the expansion force of the battery shell and the sleeve ring, and the reaction force provided by the sleeve ring to the battery shell enables the inner wall of the battery shell to maintain abutment against the sealing ring, thereby preventing the open end of the battery shell from expanding and deforming excessively and causing leakage. The overall sealing is high, and assembly testing is convenient, and the pressure test of the battery shell can be completed more quickly and accurately.

[0010] Furthermore, a first through hole and a second through hole are provided on the ring, the first through hole and the second through hole are coaxially arranged and connected, the inner diameter of the first through hole matches the outer diameter of the battery shell, the inner diameter of the second through hole is larger than the inner diameter of the first through hole, and a step edge is provided at the connection between the main body and the raised part, the diameter of the step edge is larger than the diameter of the raised part and smaller than the diameter of the main body, and the step edge is plugged into and matched with the second through hole.

[0011] Furthermore, a sealing ring groove for installing a sealing ring is arranged on the outer peripheral side wall of the raised portion, and the sealing ring groove is close to the step edge.

[0012] Furthermore, the main body, the raised portion and the step edge are integrally formed.

[0013] Furthermore, a chamfer is provided at an edge of one end of the protrusion away from the main body.

[0014] Furthermore, the air hole comprises an interface end and an air outlet end, wherein the interface end is located on the main body, and the air outlet end is located at the center of one end of the protrusion away from the main body.

[0015] Furthermore, the air outlet forms a trumpet-shaped opening.

[0016] Furthermore, a trachea connector is threadedly connected to the interface end.

[0017] Furthermore, the interface end is located at the center of an end of the main body away from the protruding portion.

[0018] Furthermore, the air hole extends in an L-shape, and the interface end is located on the circumferential outer side wall of the main body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the tooling and the battery shell connected in an embodiment of the utility model;

[0020] Figure 2 A cross-sectional schematic diagram of the connection between the tooling and the battery shell of an embodiment of the utility model;

[0021] Figure 3 It is an exploded schematic diagram of the tooling and battery case of an embodiment of the utility model;

[0022] Figure 4 This is a schematic structural diagram of a pressure connector according to an embodiment of the utility model;

[0023] Figure 5 It is a cross-sectional schematic diagram of a pressure connector according to an embodiment of the utility model;

[0024] Figure 6 It is a schematic structural diagram of a sleeve ring according to an embodiment of the utility model.

[0025] The meanings of the reference numerals are as follows:

[0026] 1. Pressurized joint; 11. Air hole; 111. Interface end; 112. Air outlet end; 12. Main body; 13. Raised portion; 131. Sealing ring groove; 132. Chamfer; 14. Step edge; 2. Ring; 21. First through hole; 22. Second through hole; 3. Sealing ring; 4. Battery shell; 5. Air pipe joint. DETAILED DESCRIPTION

[0027] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0028] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0030] See also Figures 1 to 6 The utility model discloses a tool for battery shell pressure test, which includes a pressure joint 1, a ring 2, a sealing ring 3 and an air pipe joint 5, wherein the pressure joint 1 includes a main body 12 and a protrusion 13 for inserting the battery shell 4, the sealing ring 3 is arranged on the outer peripheral side wall of the protrusion 13, specifically, a sealing ring groove 131 is arranged on the outer peripheral side wall of the protrusion 13, the sealing ring groove 131 is used to install the sealing ring 3, the sealing ring 3 is used to abut against the inner wall of the battery shell 4 to achieve inner sealing, the pressure joint 1 is also provided with an air hole 11, the air hole 11 runs through the main body 12 and the protrusion 13, the air hole 11 can be connected to an external inflation device through the air pipe joint 5, specifically, the interface end 111 of the air hole 11 is screwed with the air pipe joint 5; the ring 2 is used to be sleeved on the outside of the battery shell 4, and the ring 2 cooperates with the protrusion 13 to clamp the battery shell 4.

[0031] It is understandable that the air hole 11 can also be connected to the external inflation device in other ways, such as the inflation pipe of the inflation device is connected to the air hole 11 through a quick connector, so as to ultimately achieve the purpose of pressurizing the battery shell 4.

[0032] In the above scheme, when the battery shell 4 is pressure-tested with the aid of the tooling of the present embodiment, the open end of the battery shell 4 can be first inserted into the raised portion 13 of the pressure connector 1, so that the sealing ring 3 on the outer peripheral side wall of the raised portion 13 is abutted against the inner wall of the battery shell 4 to achieve inner sealing, and then the sleeve 2 is inserted into the battery shell 4 from the other end of the battery shell 4, so that the sleeve 2 is clamped at the open end of the battery shell 4, and the battery shell 4 is pressurized and inflated through the air hole 11, and the battery shell 4 expands. The battery shell 4 cannot be separated from the tooling through the interaction between the expansion force and the sleeve 2, and the reaction force provided by the sleeve 2 to the battery shell 4 keeps the inner wall of the battery shell 4 against the sealing ring 3, so as to avoid excessive expansion and deformation of the open end of the battery shell 4 to cause leakage. The overall sealing is high, and it is convenient to assemble and test, and the pressure test of the battery shell 4 can be completed more quickly and accurately.

[0033] In addition, in order for the ring 2 to provide a better reaction force, preferably, the length of the ring 2 and the battery shell 4 is greater than the length of the protrusion 13 inserted into the battery shell 4.

[0034] See also Figure 2 , Figures 4 to 6 , and Figure 2 The direction shown is for reference. Preferably, in the present embodiment, the inner cavity of the collar 2 is roughly in the shape of an inverted step. The collar 2 is provided with a first through hole 21 and a second through hole 22. The first through hole 21 and the second through hole 22 are coaxially arranged and connected. Specifically, the first through hole 21 is located below the second through hole 22. The inner diameter of the first through hole 21 matches the outer diameter of the battery shell 4. The inner diameter of the second through hole 22 is larger than the inner diameter of the first through hole 21. In order to facilitate the installation between the collar 2 and the battery shell 4, the inner diameter of the first through hole 21 of the collar 2 is slightly larger than the outer diameter of the battery shell 4, that is, there is a clearance fit between the first through hole 21 and the battery shell 4. In this way, the opening end of the battery shell 4 can be well compressed and slightly expanded by the sealing ring 3. and cooperates with the collar 2; a step edge 14 is provided at the connection between the main body 12 and the raised portion 13, specifically, the main body 12 is located above the step edge 14, the raised portion 13 is located below the step edge 14, the diameter of the step edge 14 is larger than the diameter of the raised portion 13 and smaller than the diameter of the main body 12, and the step edge 14 is plug-fitted with the second through hole 22, and more preferably, the diameter of the step edge 14 is substantially equal to the inner diameter of the second through hole 22, that is, the step edge 14 is over-fitted with the second through hole 22, and the plug-fitting of the step edge 14 with the second through hole 22 makes it possible to better connect and position the collar 2 with the pressing connector 1, so that the collar 2 will not loosen before pressing the battery shell 4.

[0035] See also Figure 4 and Figure 5 Preferably, the main body 12, the raised portion 13 and the step edge 14 are integrally formed to facilitate part processing and ensure high strength.

[0036] Based on the above structure of the press connector 1, preferably, the sealing ring groove 131 is close to the step edge 14, so that the axial end surface of the step edge 14 can be used to provide a resistance for the sealing ring 3 to avoid the sealing ring 3 being pushed and loosened when the battery shell 4 is inserted into the press connector 1.

[0037] See also Figure 2 , Figure 4 and Figure 5 A chamfer 132 is provided at the edge of one end of the protrusion 13 away from the main body 12 , and the chamfer 132 serves to guide the installation of the battery shell 4 .

[0038] The arrangement of the air holes 11 can be varied so as to achieve pressure inflation into the battery shell 4. Figure 4 and Figure 5 , and Figure 5 The direction shown is for reference. As a preferred specific example, the air hole 11 includes an interface end 111 and an air outlet end 112. The interface end 111 is located at the center of one end of the main body 12 away from the protrusion 13, and the air outlet end 112 is located at the center of one end of the protrusion 13 away from the main body 12, that is, the air hole 11 is vertically penetrated from the center of the upper end surface of the main body 12 to the center of the lower end surface of the protrusion 13. At this time, the air hole 11 is most convenient to process, and the air flow can be more uniform when the battery shell 4 is pressurized and inflated. In order to facilitate the installation of the air pipe joint 5, an internal thread is provided at the interface end 111 of the air hole 11; the air outlet end 112 forms a trumpet-shaped opening, so that the air outlet end 112 is more convenient for gas filling and reduces the flocculation site.

[0039] Of course, in other examples, the interface end 111 may also be located on the circumferential outer wall of the main body 12. In this case, the air hole 11 may be an L-shaped extension, and it is necessary to drill holes at the bottom and sides of the press joint 1 to form the air hole 11, which will be relatively troublesome to process.

[0040] Of course, in other examples, the interface end 111 may also deviate from the center of the main body 12 , and the air outlet end 112 may also deviate from the center of the protrusion 13 .

[0041] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A tool for battery shell pressure testing, characterized in that: include: A press connector, the press connector comprising a main body and a protrusion for inserting into a battery shell, the outer peripheral side wall of the protrusion is provided with a sealing ring for abutting against the inner wall of the battery shell, and the press connector is also provided with an air hole, which passes through the main body and the protrusion; A sleeve ring is used to be sleeved outside the battery shell, and the sleeve ring cooperates with the protruding portion to clamp the battery shell.

2. The tooling for battery shell pressure testing according to claim 1, characterized in that: The ring is provided with a first through hole and a second through hole, the first through hole and the second through hole are coaxially arranged and connected, the inner diameter of the first through hole matches the outer diameter of the battery shell, the inner diameter of the second through hole is larger than the inner diameter of the first through hole, and a step edge is provided at the connection between the main body and the raised part, the diameter of the step edge is larger than the diameter of the raised part and smaller than the diameter of the main body, and the step edge is plugged into and matched with the second through hole.

3. The tooling for battery shell pressure testing according to claim 2, characterized in that: A sealing ring groove for installing the sealing ring is arranged on the outer peripheral side wall of the protruding portion, and the sealing ring groove is close to the step edge.

4. The tooling for battery shell pressure testing according to claim 2, characterized in that: The main body, the raised portion and the step edge are integrally formed.

5. The tooling for battery shell pressure testing according to any one of claims 1 to 4, characterized in that: A chamfer is arranged at an edge of one end of the protrusion away from the main body.

6. The tooling for battery shell pressure testing according to any one of claims 1 to 4, characterized in that: The air hole comprises an interface end and an air outlet end, wherein the interface end is located on the main body, and the air outlet end is located at the center of one end of the protrusion away from the main body.

7. The tooling for battery shell pressure testing according to claim 6, characterized in that: The air outlet forms a trumpet-shaped opening.

8. The tooling for battery shell pressure testing according to claim 6, characterized in that: The interface end is threadedly connected with a trachea connector.

9. The tooling for battery shell pressure testing according to claim 6, characterized in that: The interface end is located at the center of one end of the main body away from the protruding portion.

10. The tooling for battery shell pressure testing according to claim 6, characterized in that: The air hole extends in an L shape, and the interface end is located on the circumferential outer side wall of the main body.

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