Air tightness test assembly and auxiliary tool thereof

Abstract

The utility model relates to the technical field of battery testing, and discloses an air tightness testing assembly and an auxiliary tool thereof. The auxiliary tool comprises a barrel with an air cavity formed inside, an air pipe connector communicated with the air cavity is arranged on the side wall of the barrel, one end of the barrel is used for being connected with an outer shell of the anti-explosion valve, and a push-pull type electromagnet is fixed to the other end of the barrel and comprises an electromagnet telescopic rod stretching into the air cavity. A telescopic rod reset spring is arranged at the end, away from the suction cup, of the electromagnet telescopic rod. According to the utility model, the pressure relief explosion-proof valve is opened through the push-pull electromagnet, then the air tightness test of the battery pack box after inflation is realized, the operation is simple and convenient, and the efficiency and convenience of the offline detection of the air tightness of the energy storage battery pack can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery testing, in particular to an airtightness testing component and an auxiliary tooling thereof. Background Art

[0002] At present, energy storage battery packs are the basic core components of electrochemical energy storage. Their safety, working stability and reliability directly affect the safety of energy storage power station operation.

[0003] To ensure the reliability of energy storage battery packs, they must be sealed and meet IP67 standards for water and dust resistance. This prevents dust and water from entering the battery and causing short circuits, impacting its service life and safety, and even the overall safety of the entire energy storage power station. Therefore, energy storage battery packs must undergo airtightness testing before leaving the factory to prevent the safety protection level from failing to meet design requirements. This test involves inflating the battery pack casing and testing the internal pressure. The equipment then measures the difference within a specified time period to determine whether the tested battery pack casing meets airtightness requirements.

[0004] During the testing process, inflation testing is usually carried out through a pressure relief and explosion-proof valve installed on the battery pack body. To ensure the accuracy of the test, it is necessary to ensure that the pressure relief and explosion-proof valve is in a sealed state after the inflation is completed. Therefore, it is necessary to provide a test component that can not only better inflate the inside of the battery pack body, but also ensure that the pressure relief and explosion-proof valve is in a sealed state after the inflation is completed. Utility Model Content

[0005] The utility model aims to solve the problems existing in the prior art during the battery pack box inflation test process and provides an airtightness test assembly and auxiliary tooling thereof.

[0006] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0007] The auxiliary tooling includes a tooling body, which includes a cylinder with an air cavity formed inside. A trachea joint connected to the air cavity is provided on the side wall of the cylinder. One end of the cylinder is used to be connected to the outer shell of the explosion-proof valve, and the other end is fixed with a push-pull electromagnet. The push-pull electromagnet includes an electromagnet telescopic rod extending into the air cavity. The end of the electromagnet telescopic rod is provided with a suction cup for adsorbing the valve core of the explosion-proof valve. The end of the electromagnet telescopic rod away from the suction cup is provided with a telescopic rod reset spring.

[0008] Preferably, the cylinder includes a bottom wall and an annular side wall, the push-pull electromagnet is fixed on the outer surface of the bottom wall, and the end of the annular side wall away from the bottom wall is provided with a clamping block for clamping with the outer shell of the pressure relief and explosion-proof valve.

[0009] Preferably, the clamping block is disposed on the inner wall of the cylinder and is configured in an arc shape. The inner diameter of the clamping block is smaller than the inner diameter of the cylinder and the arc length does not exceed the arc length of a semicircular arc. The clamping block is single, and the gap between the two ends of the clamping block constitutes a clamping inlet for engaging with the outer housing of the pressure relief and explosion-proof valve. The outer wall of the outer housing of the pressure relief and explosion-proof valve is provided with an annular groove that engages with the clamping block. By designing the clamping block in an arc shape that does not exceed the arc length of a semicircular arc, a rotational clamping connection between the clamping block and the annular groove can be achieved.

[0010] Preferably, a clamping block is provided on the inner wall of the cylinder and is configured in an arc shape. The inner diameter of the clamping block is smaller than the inner diameter of the cylinder, and multiple clamping blocks are provided, evenly spaced along the circumference of the cylinder. The outer shell of the pressure relief and explosion-proof valve is provided with an annular groove for engaging with the clamping block and a clearance groove communicating with the annular groove for axially extending the clamping block into the annular groove. The clearance groove and the annular groove enable a rotational engagement between the cylinder and the pressure relief and explosion-proof valve, making operation simple and easy to disassemble.

[0011] Preferably, the bottom wall is provided with a through hole through which the power supply magnet telescopic rod passes, and the inner surface of the bottom wall is provided with a limit slot coaxially arranged with the through hole. The telescopic electromagnet rod is provided with a limit block capable of being retained within the limit slot. The cooperation between the limit block and the limit slot can control the movement of the telescopic electromagnet rod within the cylinder and also protect the movement of the various components of the electromagnet.

[0012] The air tightness test assembly includes a pressure relief explosion-proof valve, which includes an explosion-proof valve outer shell and an explosion-proof valve core arranged in the explosion-proof valve outer shell. It also includes the aforementioned auxiliary tooling, which is installed on the explosion-proof valve outer shell. The electromagnet telescopic rod can drive the suction cup to adsorb the explosion-proof valve core to open it.

[0013] Preferably, the end surface of the explosion-proof valve outer shell forms a sealing surface that forms a seal with the explosion-proof valve core, and the electromagnet telescopic rod can drive the suction cup to adsorb the explosion-proof valve core to move toward or away from the sealing surface.

[0014] Preferably, the explosion-proof valve housing includes a retaining ring for connection to the battery pack housing and a valve core guide disposed in the middle of the retaining ring. The valve core guide comprises a guide cylinder and a guide rod disposed within the guide cylinder. The end of the guide rod is connected to the explosion-proof valve core and is sleeved with a sealing spring for driving the explosion-proof valve core toward the sealing surface. The provision of the sealing spring ensures the sealing performance of the pressure relief explosion-proof valve even after the auxiliary tooling is removed, preventing it from affecting the accuracy of subsequent airtightness testing results.

[0015] Preferably, an annular sealing ridge is provided on the sealing surface, and an annular sealing groove is provided on the end surface of the explosion-proof valve core facing the sealing surface, which cooperates with the annular sealing ridge. The cooperation between the annular sealing ridge and the annular sealing groove can enhance the sealing performance between the explosion-proof valve core and the sealing surface, ensuring that there will be no leakage during the test, which would affect the test accuracy.

[0016] Preferably, the fixing ring is provided with a plurality of threaded holes evenly distributed along the circumference thereof for connection with the battery pack case. The threaded holes enable the pressure relief and explosion-proof valve to be installed on the battery pack case, which is simple to operate and convenient to assemble and disassemble.

[0017] The utility model has significant technical effects due to the adoption of the above technical solutions:

[0018] In this embodiment, a push-pull electromagnet is used to open the pressure relief explosion-proof valve, and then the air tightness test of the battery pack box after inflation is realized. The operation is simple and convenient. At the same time, the electromagnet can be directly connected to the DC power of the battery pack for power supply, without the need for other external drive equipment, which effectively improves the efficiency and convenience of the offline detection of the air tightness of the energy storage battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the auxiliary tooling of the utility model.

[0020] Figure 2 It is a structural schematic diagram of the cylinder in Example 1.

[0021] Figure 3 It is a schematic diagram of the utility model in use state.

[0022] Figure 4 It is an exploded view of the pressure relief and explosion-proof valve and auxiliary tooling.

[0023] Figure 5 It is a structural diagram of the pressure relief and explosion-proof valve of Example 1.

[0024] Figure 6 It is a structural diagram of the pressure relief and explosion-proof valve of Example 2.

[0025] Figure 7 It is a cross-sectional view of the cylinder in Example 2. DETAILED DESCRIPTION

[0026] The present invention is described in further detail below with reference to the accompanying drawings and embodiments.

[0027] Example 1

[0028] like Figure 1-Figure 5As shown, this embodiment 1 provides an auxiliary tooling installed on the pressure relief and explosion-proof valve 3, which is used to open the pressure relief and explosion-proof valve 3 to inflate the battery pack box 5 when performing an air tightness test. The tooling includes a tooling body, the tooling body includes a cylinder 1 with an air cavity 100 formed inside, and an air pipe joint 2 connected to the air cavity 100 is provided on the side wall of the cylinder 1. One end of the cylinder 1 is used to be connected to the explosion-proof valve outer shell 301, and the other end is fixed with a push-pull electromagnet 4. The push-pull electromagnet 4 includes an electromagnet telescopic rod 401 extending into the air cavity 100, and the end of the electromagnet telescopic rod 401 is provided with a suction cup 402 for adsorbing the explosion-proof valve core 302, and the end of the electromagnet telescopic rod 401 away from the suction cup 402 is provided with a telescopic rod reset spring 403.

[0029] The electromagnet telescopic rod 401 of the push-pull electromagnet 4 moves to drive the suction cup 402 to move toward the explosion-proof valve core 302, and then the suction cup 402 absorbs the explosion-proof valve core 302, and then the electromagnet contracts and switches on, so that the electromagnet telescopic rod 401 drives the explosion-proof pressure relief valve core to move and open the explosion-proof pressure relief valve, and the high-pressure gas enters the energy storage battery pack through the air pipe connector 2 to complete the inflation.

[0030] After the inflation is completed, the electromagnet telescopic rod 401 pushes the explosion-proof pressure relief valve core to the sealing surface 305 again, so that the pressure relief explosion-proof valve 3 is sealed again, ensuring the accuracy of subsequent air tightness testing, and the explosion-proof pressure relief valve core can further enhance its sealing effect under the dual action of its sealing spring 309 and the electromagnet telescopic rod 401.

[0031] Of course, the completion of inflation makes the electromagnet power off, and the electromagnet telescopic rod 401 no longer applies force to the suction cup 402, and then the adsorption between the suction cup 402 and the valve core of the pressure relief valve can be released. Then the entire auxiliary tooling is removed. Under the action of the sealing spring 309, the pressure relief and explosion-proof valve 3 still has good sealing performance and will not affect the subsequent air tightness detection.

[0032] The pressure relief explosion-proof valve 3 is opened, and then the air tightness test of the battery pack box 5 after inflation is realized. The operation is simple and convenient. At the same time, the electromagnet can be directly connected to the DC power of the battery pack for power supply, without the need for external driving equipment, which effectively improves the efficiency and convenience of the offline detection of the air tightness of the energy storage battery pack.

[0033] In this embodiment, the cylinder 1 includes a bottom wall 101 and an annular side wall 102. The push-pull electromagnet 4 is fixed on the outer surface of the bottom wall 101. The end of the annular side wall 102 away from the bottom wall 101 is provided with a clamping block 103 for clamping with the outer shell of the pressure relief and explosion-proof valve 3.

[0034] Among them, the clamping block 103 is arranged on the inner wall of the cylinder 1 and is constructed in a circular arc shape. The inner diameter of the clamping block 103 is smaller than the inner diameter of the cylinder 1 and the arc length does not exceed the arc length of a semicircular arc. The clamping block 103 is single and the gap between the two ends of the clamping block 103 constitutes a clamping entrance 104 that is clamped with the outer shell of the pressure relief and explosion-proof valve 3. An annular groove 303 that is clamped with the clamping block 103 is provided on the outer side wall of the outer shell of the pressure relief and explosion-proof valve 3.

[0035] The clamping connection between the cylinder 1 and the explosion-proof valve outer shell 301 is achieved by the cooperation between the clamping block 103 and the annular groove 303. When connecting, the clamping inlet 104 on the cylinder 1 is aligned with the annular groove 303 on the explosion-proof valve outer shell 301, and then the cylinder 1 is gradually rotated so that the clamping block 103 is gradually clamped into the annular groove 303, completing the assembly between the cylinder 1 and the explosion-proof pressure relief valve.

[0036] The bottom wall 101 is provided with a through hole 106 through which the power supply magnet telescopic rod 401 passes. The inner surface of the bottom wall 101 is provided with a limiting groove 105 coaxially arranged with the through hole 106. The electromagnet telescopic rod 401 is provided with a limiting block 404 that can be limited in the limiting groove 105.

[0037] The setting of the limiting groove 105 and the limiting block 404 can prevent the electromagnet telescopic rod 401 from continuing to shrink during the retraction process, control the movement stroke of the electromagnet telescopic rod 401 in the cylinder 1, prevent the suction cup 402 from being squeezed onto the inner wall of the cylinder 1, and also protect the movement process of each component of the electromagnet.

[0038] Example 2

[0039] Same as Example 1, Figure 6 、 Figure 7 As shown, the difference is that in this embodiment, the block 103 is arranged on the inner wall of the cylinder 1 and is configured in an arc shape. The inner diameter of the block 103 is smaller than the inner diameter of the cylinder 1 and there are multiple blocks 103. The multiple blocks 103 are evenly arranged along the circumference of the cylinder 1. The outer shell of the pressure relief and explosion-proof valve 3 is provided with an annular groove 303 that is engaged with the block 103 and a clearance groove 304 that is connected to the annular groove 303 for the block 103 to axially extend into the annular groove 303. The open end of the clearance groove 304 extends to the end face of the outer shell of the pressure relief and explosion-proof valve 3.

[0040] During the assembly process, the cylinder 1 first aligns its clamping block 103 with the open end of the clearance groove 304 on the outer shell of the pressure relief and explosion-proof valve 3, so that the cylinder 1 first moves toward the pressure relief and explosion-proof valve 3 along the circumference of the cylinder 1, so that the clamping block 103 completely enters the annular groove 303 through the clearance groove 304, and then rotates the cylinder 1 so that the clamping block 103 and the clearance groove 304 are staggered, so that the rotational clamping connection between the cylinder 1 and the outer shell 301 of the explosion-proof valve can be achieved.

[0041] Example 3

[0042] like Figure 1-Figure 7 As shown, an air tightness test assembly is provided in this embodiment, including a pressure relief explosion-proof valve 3, the pressure relief explosion-proof valve 3 including an explosion-proof valve outer shell 301 and an explosion-proof valve spool 302 arranged in the explosion-proof valve outer shell 301, and also including the auxiliary tooling in Example 1 or Example 2, the auxiliary tooling is installed on the explosion-proof valve outer shell 301, and the electromagnet telescopic rod 401 can drive the suction cup 402 to adsorb the explosion-proof valve spool 302 to open or close.

[0043] In this experiment, the end face of the explosion-proof valve outer shell 301 forms a sealing surface 305 that forms a seal with the explosion-proof valve core 302, and the electromagnet telescopic rod 401 can drive the suction cup 402 to adsorb the explosion-proof valve core 302 and move toward or away from the sealing surface 305.

[0044] The explosion-proof valve outer shell 301 includes a fixing ring 306 for connecting to the battery pack case 5 and a valve core guide portion arranged in the middle of the fixing ring 306. A plurality of threaded holes 312 for connecting to the battery pack case 5 are evenly arranged along the circumference of the fixing ring 306. The pressure relief explosion-proof valve 3 is installed on the battery pack case 5 through the threaded holes 312, which is simple to operate and easy to load and unload.

[0045] The valve core guide comprises a guide cylinder 307 and a guide rod 308 disposed within the guide cylinder 307. The end of the guide rod 308 is connected to the explosion-proof valve core 302. A sealing spring 309 is sleeved on the guide rod 308 to drive the explosion-proof valve core 302 toward the sealing surface 305. The provision of the sealing spring 309 ensures that the sealing performance of the pressure relief explosion-proof valve 3 is maintained even after the auxiliary tooling is removed, preventing it from affecting the accuracy of subsequent airtightness test results.

[0046] An annular sealing ridge 310 is provided at the sealing surface 305, and an annular sealing groove 311 is provided on the end surface of the explosion-proof valve core 302 facing the sealing surface 305, which cooperates with the annular sealing ridge 310. The cooperation between the annular sealing ridge 310 and the annular sealing groove 311 can make the sealing performance between the explosion-proof valve core 302 and the sealing surface 305 higher, ensuring that no air leakage will occur during the test and affect the test accuracy.

[0047] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application based on one or several embodiments provided in the present application to obtain other embodiments, and these embodiments do not exceed the scope of protection of the present application.

[0048] In short, the above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention patent.

Claims

1. Auxiliary tooling, including a tooling body, characterized by: The tooling body comprises a cylinder (1) with an air cavity (100) formed therein, a trachea joint (2) communicating with the air cavity (100) being provided on a side wall of the cylinder (1), one end of the cylinder (1) being used for connecting with an explosion-proof valve outer shell (301), and a push-pull electromagnet (4) being fixed at the other end, the push-pull electromagnet (4) comprising an electromagnet telescopic rod (401) extending into the air cavity (100), a suction cup (402) for adsorbing a valve core (302) of the explosion-proof valve being provided at an end of the electromagnet telescopic rod (401), and a telescopic rod return spring (403) being provided at an end of the electromagnet telescopic rod (401) away from the suction cup (402).

2. The auxiliary tooling according to claim 1, characterized in that: The cylinder (1) comprises a bottom wall (101) and an annular side wall (102); the push-pull electromagnet (4) is fixed on the outer surface of the bottom wall (101); and a clamping block (103) for clamping with the outer shell of the pressure relief explosion-proof valve (3) is provided at the end of the annular side wall (102) away from the bottom wall (101).

3. The auxiliary tooling according to claim 2, characterized in that: The clamping block (103) is arranged on the inner side wall of the cylinder (1) and is configured in an arc shape. The inner diameter of the clamping block (103) is smaller than the inner diameter of the cylinder (1) and the arc length does not exceed the arc length of a semicircular arc. The clamping block (103) is single and the gap between the two ends of the clamping block (103) constitutes a clamping inlet (104) clamped with the outer shell of the pressure relief and explosion-proof valve (3). An annular groove (303) clamped with the clamping block (103) is provided on the outer side wall of the outer shell of the pressure relief and explosion-proof valve (3).

4. The auxiliary tooling according to claim 2, characterized in that: The clamping block (103) is arranged on the inner side wall of the cylinder (1) and is configured in an arc shape. The inner diameter of the clamping block (103) is smaller than the inner diameter of the cylinder (1) and there are a plurality of clamping blocks (103). The plurality of clamping blocks (103) are evenly arranged along the circumference of the cylinder (1). The outer shell of the pressure relief explosion-proof valve (3) is provided with an annular groove (303) clamped with the clamping block (103) and a clearance groove (304) communicating with the annular groove (303) for allowing the clamping block (103) to axially extend into the annular groove (303).

5. The auxiliary tooling according to claim 2, characterized in that: The bottom wall (101) is provided with a through hole (106) through which the power supply magnet telescopic rod (401) passes; the inner surface of the bottom wall (101) is provided with a limiting groove (105) coaxially arranged with the through hole (106); and the electromagnet telescopic rod (401) is provided with a limiting block (404) capable of being limited in the limiting groove (105).

6. An airtightness test assembly, comprising a pressure relief explosion-proof valve (3), the pressure relief explosion-proof valve (3) comprising an explosion-proof valve outer shell (301) and an explosion-proof valve core (302) disposed within the explosion-proof valve outer shell (301), characterized in that: It also includes the auxiliary tooling as described in any one of claims 1 to 5, wherein the auxiliary tooling is installed on the explosion-proof valve outer shell (301), and the electromagnet telescopic rod (401) can drive the suction cup (402) to absorb the explosion-proof valve core (302) to open.

7. The airtightness test assembly according to claim 6, characterized in that: The end surface of the explosion-proof valve outer shell (301) forms a sealing surface (305) that forms a seal with the explosion-proof valve core (302). The electromagnet telescopic rod (401) can drive the suction cup (402) to absorb the explosion-proof valve core (302) and move it toward or away from the sealing surface (305).

8. The airtightness test assembly according to claim 7, characterized in that: The explosion-proof valve outer shell (301) includes a fixing ring (306) for connecting to the battery pack box (5) and a valve core guide portion arranged in the middle of the fixing ring (306). The valve core guide portion includes a guide cylinder (307) and a guide rod (308) arranged in the guide cylinder (307). The end of the guide rod (308) is connected to the explosion-proof valve core (302), and a sealing spring (309) is sleeved on the guide rod (308) for driving the explosion-proof valve core (302) to move toward the sealing surface (305).

9. The airtightness test assembly according to claim 7, characterized in that: An annular sealing convex strip (310) is provided on the sealing surface (305), and an annular sealing groove (311) that cooperates with the annular sealing convex strip (310) is provided on the end surface of the explosion-proof valve core (302) facing the sealing surface (305).

10. The airtightness test assembly according to claim 8, characterized in that: A plurality of threaded holes (312) for connecting to the battery pack box (5) are evenly arranged along the circumference of the fixing ring (306).

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