Battery pack air tightness detection device

Abstract

The utility model discloses a battery pack air tightness detection device which comprises a connecting pipe, two ends of the connecting pipe are fixedly connected with first threaded connecting blocks, the first threaded connecting blocks are internally in threaded connection with connecting pieces, the upper surface of the connecting pipe is fixedly connected with a U-shaped pipe, and the U-shaped pipe is communicated with the interior of the connecting pipe. The other end of the U-shaped pipe is fixedly connected with a second threaded connecting block, the second threaded connecting block is internally in threaded connection with a second threaded connector, the other end of the second threaded connector is fixedly connected with a transmission hose, the other end of the transmission hose is connected with a transparent observation pipe, and the whole transparent observation pipe is transparent. After a certain amount of clear water is injected into the transparent observation tube for the first time, the transparent observation tube is placed in a horizontal state by screwing the plug in the later period, the clear water can be stored in the transparent observation tube, a battery pack needing to be detected can be replaced, and detection operation can be performed again after the transparent observation tube is made to be vertical again and the plug is screwed off.

Description

Technical Field

[0001] This utility model relates to a testing device, and more particularly to a battery pack airtightness testing device. Background Technology

[0002] With the development of new energy vehicles, the safety of power battery packs, as core components of pure electric vehicles and hybrid electric vehicles, has gradually received widespread attention. The airtightness of power battery packs directly affects the working safety of battery equipment and the safety of electric vehicles.

[0003] For example, a lithium-ion battery pack airtightness testing device, disclosed in Chinese Patent Publication No. CN209387224U, includes an inflation tube, an air pump, and a pressure gauge. The inflation tube is open at both ends and has connectors at both ends. Multiple air tube clamps are provided on the inflation tube, and the air pump and pressure gauge are connected to the air tube clamps respectively. When testing the airtightness of the battery pack, a rubber gasket is first placed on the fixing bolts. The two fixing bolts are then screwed onto the two vent valves of the battery pack with a certain torque. Then, the fixing nuts at both ends of the inflation tube are fixed to the two bolts. The air tubes of the air pump and pressure gauge are respectively fixed to the air tube clamps of the inflation tube. The battery pack is pressurized by the air pump, and the internal pressure of the battery pack is observed by the pressure gauge. The airtightness of the battery pack can be detected by observing the pressure holding condition. This invention offers good flexibility, is easy to operate, and can solve the problem of battery pack airtightness testing.

[0004] Some problems were found when using the existing lithium-ion battery pack airtightness testing device. During the testing process, it is necessary to inject a certain amount of air pressure into the battery pack. First, it is necessary to continuously pump air into the battery pack using an air pump, which requires manual operation and is quite cumbersome. Second, it is difficult to control the amount of air injected manually. When the air pressure inside the battery pack is too high, it can cause damage to the internal components of the battery pack. Utility Model Content

[0005] The purpose of this invention is to provide a battery pack airtightness testing device to solve the existing problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a battery pack airtightness testing device, comprising a connecting pipe, with first threaded connecting blocks fixedly connected to both ends of the connecting pipe, a connector threadedly connected to the first threaded connecting block, a U-shaped tube fixedly connected to the top of the connecting pipe, the U-shaped tube communicating with the interior of the connecting pipe, a second threaded connecting block fixedly connected to the other end of the U-shaped tube, a second threaded connecting head threadedly connected to the second threaded connecting block, a transmission hose fixedly connected to the other end of the second threaded connecting head, and a transparent observation tube connected to the other end of the transmission hose, the transparent observation tube being entirely transparent.

[0007] Preferably, absorbent cotton columns are fixedly attached to the inside of the connecting tube near the edges of both ends, a support leg is fixedly attached to the bottom of the connecting tube, and a buckle is fixedly attached to one side of the U-shaped tube. The buckle cooperates with the transparent observation tube.

[0008] Preferably, the connector includes a connecting hose and two first threaded connectors, the two first threaded connectors being fixed to both ends of the connecting hose, and the connecting hose being threadedly engaged with the first threaded connector.

[0009] Preferably, the outer wall of the transparent observation tube is engraved with graduations.

[0010] Preferably, a third threaded connecting block is fixed to the other end of the transparent observation tube, and a plug is installed in the internal thread of the third threaded connecting block.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. After initially adding a certain amount of clean water into the transparent observation tube, the plug is then screwed on to place the transparent observation tube in a horizontal position. The clean water can be stored inside the transparent observation tube. The battery pack to be tested can then be replaced. After the transparent observation tube is turned vertical again and the plug is screwed off, the testing operation can be performed again. Compared with the existing device, there is no need to repeat the air injection operation, reducing the use of manpower.

[0013] 2. In the event of water flowing into the connecting pipe due to improper operation, the absorbent cotton column can absorb the water that has entered the connecting pipe, preventing the water from flowing from the connecting pipe into the battery pack and causing damage or short circuit to the internal components of the battery pack. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a half-sectional view of the connecting pipe of this utility model;

[0016] Figure 3 This is a schematic diagram of the connecting component structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the transparent observation tube structure of this utility model.

[0018] In the diagram: 1. Connecting pipe; 101. Support leg; 102. First threaded connecting block; 103. Absorbent cotton column; 104. U-shaped pipe; 105. Second threaded connecting block; 106. Buckle; 2. Connector; 201. Connecting hose; 202. First threaded connector; 3. Transparent observation tube; 301. Scale; 302. Transmission hose; 303. Second threaded connector; 304. Third threaded connecting block; 305. Plug. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-4 This utility model provides a technical solution: a battery pack airtightness testing device, including a connecting pipe 1, with first threaded connecting blocks 102 fixed to both ends of the connecting pipe 1, and a connector 2 internally threaded to the first threaded connecting blocks 102, a U-shaped pipe 104 fixed to the top of the connecting pipe 1, the U-shaped pipe 104 communicating with the interior of the connecting pipe 1, a second threaded connecting block 105 fixed to the other end of the U-shaped pipe 104, a second threaded connector 303 internally threaded to the second threaded connecting block 105, a transmission hose 302 fixed to the other end of the second threaded connector 303, and a transparent observation tube 3 connected to the other end of the transmission hose 302, the transparent observation tube 3 being entirely transparent.

[0021] In this embodiment, the two vents of the battery pack are connected using connector 2. Then, connector 1 is placed horizontally, making U-shaped tube 104 vertical. The transparent observation tube 3 is then held vertically, and a certain amount of water is added to it. Since both the transparent observation tube 3 and U-shaped tube 104 are vertical, the U-shaped tube 104 is connected using a transmission hose 302 and a second threaded connector 303. The water entering the transparent observation tube 3 first accumulates at the bend of the transmission hose 302, sealing its interior. Because connector 1 and U-shaped tube 104 are connected to the battery pack, the interior is sealed. Subsequent water added to the transparent observation tube 3 will be affected by the air pressure inside U-shaped tube 104 and connector 1. This makes it difficult for clean water to enter the U-shaped tube 104, causing clean water to accumulate inside the transparent observation tube 3. Then, stop adding clean water and record the height after the liquid level inside the transparent observation tube 3 stabilizes. After a period of time, check the clean water level inside the transparent observation tube 3 again. If the liquid level does not drop, the battery pack is well sealed. When the clean water level drops, there is an air leakage inside the battery pack, and the airtightness is poor. After the test is completed, close the upper end of the transparent observation tube 3 to make the transparent observation tube 3 horizontal. At this time, disconnect the connection to the battery pack from the connector 2. Clean water will not enter the U-shaped tube 104. Just reconnect the connector 2 to the battery pack and keep the transparent observation tube 3 in a vertical position and open the upper end. There is no need to continuously pump air into the connecting tube 1 as in traditional devices, making the operation more convenient.

[0022] To achieve the purpose of connecting the battery pack, the device adopts the following technical solution: absorbent cotton columns 103 are fixedly connected to the inside of the connecting tube 1 near the edges of both ends, support legs 101 are fixedly connected to the bottom of the connecting tube 1, a buckle 106 is fixedly connected to one side of the U-shaped tube 104, the buckle 106 cooperates with the transparent observation tube 3, the connecting component 2 includes a connecting hose 201 and two first threaded connectors 202, the two first threaded connectors 202 are respectively fixed to both ends of the connecting hose 201, and the connecting hose 201 is threadedly engaged with the first threaded connector 102.

[0023] The absorbent cotton column 103 can absorb water that flows into the connecting pipe 1 from the U-shaped tube 104 during erroneous operation, preventing water from flowing into the battery pack and causing damage or short circuits to the internal components. The support leg 101 allows the connecting pipe 1 to be placed horizontally on the testing table. The connecting hose 201 is connected to the first threaded connector 202, which can be connected to the vent of the battery pack. Another one is connected to the first threaded connecting block 102. The connecting hose 201 is made of flexible tubing. When the vent spacing of different battery packs is the same, the connecting hose 201 can be used to deflect the position of the first threaded connector 202 by a certain distance, thereby enabling the device to be connected to battery packs of different specifications.

[0024] In order to achieve the purpose of sealing the upper end of the transparent observation tube 3, the device adopts the following technical solution: the outer wall of the transparent observation tube 3 is engraved with a scale 301, the other end of the transparent observation tube 3 is fixedly connected to a third threaded connecting block 304, and a plug 305 is installed in the internal thread of the third threaded connecting block 304.

[0025] The transparent observation tube 3, which is in a transparent state, is assisted by the scale 301. The level of the clear water inside the transparent observation tube 3 can be accurately observed. The third threaded connecting block 304 is threadedly engaged with the plug 305, which can seal the end of the transparent observation tube 3. This prevents the clear water inside the transparent observation tube 3 from flowing out when the transparent observation tube 3 is placed horizontally.

[0026] The working principle and usage process of this utility model are as follows: During use, the connecting hose 201 on the connector 2 is connected to the vent of the battery pack. Then, the connecting tube 1 is placed horizontally, so that the U-shaped tube 104 is vertical. The transparent observation tube 3 is then vertically secured to the buckle 106, making the transparent observation tube 3 parallel to the U-shaped tube 104. The plug 305 is rotated open to add a certain amount of clean water into the transparent observation tube 3. Since the transparent observation tube 3 and the U-shaped tube 104 form a U-shaped tube, the clean water added to the transparent observation tube 3 is difficult to enter the connecting tube 1 due to air pressure. After the liquid level inside the transparent observation tube 3 stabilizes, the height is recorded. After a period of time, the liquid level inside the transparent observation tube 3 is checked again. If the liquid level does not drop, the battery pack has good sealing. When the liquid level drops, air leakage occurs inside the battery pack, indicating poor airtightness.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A battery pack airtightness testing device, comprising a connecting pipe (1), characterized in that: The connecting pipe (1) is fixed with a first threaded connecting block (102) at both ends. The first threaded connecting block (102) is internally threaded with a connector (2). The connecting pipe (1) is fixed with a U-shaped pipe (104) on top. The U-shaped pipe (104) communicates with the inside of the connecting pipe (1). The other end of the U-shaped pipe (104) is fixed with a second threaded connecting block (105). The second threaded connecting block (105) is internally threaded with a second threaded connector (303). The other end of the second threaded connector (303) is fixed with a transmission hose (302). The other end of the transmission hose (302) is connected with a transparent observation tube (3). The transparent observation tube (3) is transparent.

2. The battery pack airtightness testing device according to claim 1, characterized in that: Absorbent cotton columns (103) are fixedly connected to the inside of the connecting tube (1) near the edges of both ends. A support leg (101) is fixedly connected to the bottom of the connecting tube (1). A buckle (106) is fixedly connected to one side of the U-shaped tube (104). The buckle (106) cooperates with the transparent observation tube (3).

3. The battery pack airtightness testing device according to claim 1, characterized in that: The connector (2) includes a connecting hose (201) and two first threaded connectors (202). The two first threaded connectors (202) are respectively fixed to both ends of the connecting hose (201). The connecting hose (201) is threadedly engaged with the first threaded connecting block (102).

4. The battery pack airtightness testing device according to claim 1, characterized in that: The outer wall of the transparent observation tube (3) is engraved with graduations (301).

5. The battery pack airtightness testing device according to claim 1, characterized in that: The other end of the transparent observation tube (3) is fixedly connected to a third threaded connecting block (304), and a plug (305) is installed in the internal thread of the third threaded connecting block (304).

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