Explosion-proof valve testing device on battery cover plate

Abstract

The utility model discloses a testing device for an explosion-proof valve on a battery cover plate, which comprises a lower die provided with a ventilation cavity, an air outlet of the ventilation cavity is arranged on a die assembly surface of the lower die, an elastic cofferdam is arranged on the die assembly surface at the periphery of the air outlet, and the elastic cofferdam is arranged on the lower die. And when the battery cover plate is pressed at the air outlet and one end of the anti-explosion valve is arranged in the elastic cofferdam, the battery cover plate and the air outlet are in sealed contact by virtue of the elastic cofferdam. Through the arrangement of the lower mold and the elastic cofferdam, the lower mold not only can support the battery cover plate, but also can seal the space between the air outlet of the ventilation cavity on the lower mold and the battery cover plate, so that one end of an anti-explosion valve on the battery cover plate is arranged at the air outlet, and gradually pressurized air is introduced into the air inlet from the rear side; therefore, the device can act on the explosion-proof valve in a sealed environment, achieves the accurate testing of the explosion-proof valve, and is convenient to test.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of explosion -proof valve test, concretely relates to a kind of explosion -proof valve testing device on battery cover plate. BACKGROUND

[0002] At present, the quality safety of lithium battery is always the most important in the field of lithium battery, lithium battery may appear external short circuit, internal short circuit, overcharge and other phenomena in repeated charge-discharge process, cause battery internal temperature to sharply increase, electrolyte vaporization, expand battery shell, and thus explosion occurs.For preventing this phenomenon from happening, explosion-proof valve will be installed on lithium battery, when pressure reaches a certain time, explosion-proof valve first cracks, play pressure relief role, to avoid the occurrence of explosion.

[0003] From the angle of cell structure, battery type can be divided into square aluminum shell / steel shell battery, cylindrical steel shell battery, soft package square battery and plastic shell square battery etc., the battery cover plate shape used by different types of batteries is also different, and the position of explosion-proof valve on it is also different.For example, square aluminum shell battery uses battery cover plate as shown in Figure 1 , 101 in the figure represents battery cover plate, 102 represents explosion-proof valve arranged on battery cover plate, and 103 represents pole post through hole, and explosion-proof valve is arranged at the position between two pole post through holes.

[0004] In production process, assembly work between explosion-proof valve and battery cover plate is generally carried out in batches, and battery cover plate and explosion-proof valve after installation constitute a preliminary whole, and then the preliminary whole can be transported to specified position for assembly.In the above operation process, test personnel generally randomly selects several preliminary wholes from batched preliminary wholes for testing, which mainly carries out air pressure test on explosion-proof valve of preliminary whole to test whether air pressure burst point value meets requirements, and then estimates the qualified rate of batched preliminary whole through the qualified rate of tested explosion-proof valve.

[0005] As for the current testing means of preliminary whole, generally: first, clamp is used to clamp and fix preliminary whole, then test personnel hand or use tool to insert gas pipe joint on explosion-proof valve, then high pressure gas is continuously introduced into gas pipe, until explosion-proof valve explodes, by recording the air pressure value when explosion-proof valve explodes, the initial opening pressure lower limit value of explosion-proof valve is determined, whether the air pressure value when explosion-proof valve explodes is within qualified threshold range, that is, whether the explosion-proof valve is a qualified product or a defective product is judged.But in this testing process, gas pipe needs to be manually inserted on explosion-proof valve, and the insertion work needs to be adjusted several times to ensure the connection sealing property between gas pipe and explosion-proof valve;At the same time, different types of explosion-proof valve also need to set up several corresponding caliber gas pipes to adapt to insertion, which improves testing cost.

[0006] Based on this, we propose a battery cover on the explosion-proof valve testing device to solve the above problems. The utility model discloses a battery cover on the explosion-proof valve testing device

[0007] The utility model discloses a battery cover on the explosion-proof valve testing device, which can quickly place one end of the explosion-proof valve in a sealed environment by setting an air chamber and an elastic cofferdam, and then can test the explosion-proof valve by introducing gradually increasing gas into the air chamber.

[0008] To solve the above problems, the utility model provides the following technical scheme:

[0009] A battery cover on the explosion-proof valve testing device, comprising a lower mold having an air chamber thereon, wherein the gas outlet of the air chamber is arranged on the mold closing surface of the lower mold, and an elastic cofferdam is arranged on the position of the mold closing surface outside the periphery of the gas outlet, so that the battery cover and the gas outlet are sealed and contacted by the elastic cofferdam when the battery cover is pressed on the gas outlet and one end of the explosion-proof valve is placed in the elastic cofferdam.

[0010] By setting the air chamber and the elastic cofferdam, when the battery cover is pressed on the gas outlet and one end of the explosion-proof valve is placed in the elastic cofferdam, the deformation of the elastic cofferdam can make the explosion-proof valve be in a sealed environment, which is convenient for subsequent rapid testing.

[0011] As a further scheme of the utility model, the testing device further comprises a limiting piece arranged on the mold closing surface, and the limiting piece comprises a pin shaft mounted on the mold closing surface, and the size of the pin shaft is matched with the size of the through hole of the pole column on the battery cover.

[0012] By the pin shaft, when the battery cover is directly placed on the lower mold, one end of the explosion-proof valve will automatically fall into the gas outlet, and there is no need to adjust the position of the battery cover multiple times.

[0013] As a further scheme of the utility model, the pin shaft is slidingly arranged on the mold closing surface, and a locking piece is arranged on the pin shaft and can be locked with the mold closing surface.

[0014] By adjusting the pin shaft, the position of the explosion-proof valve on different types of battery covers can be matched.

[0015] As a further scheme of the utility model, the testing device further comprises an upper mold for pressing the battery cover on the gas outlet.

[0016] By arranging the upper mold, the pressing effect on the battery cover can be realized.

[0017] As a further scheme of the utility model, a containing groove for containing the pin shaft is arranged on the side of the upper mold facing the gas outlet.

[0018] Through the setting of the accommodating groove, the top of the pin shaft is accommodated by the upper die in the closed die state of the upper die and the lower die.

[0019] As a further scheme of the utility model: the upper die is provided with a through hole for exposing the explosion-proof valve.

[0020] Through the setting of the through hole, the explosion-proof valve is only subjected to the action of high-pressure gas during the test process, and the through hole can also be used as an observation hole.

[0021] As a further scheme of the utility model: the closing die surface is provided with a sliding groove for sliding of the pin shaft.

[0022] Through the setting of the sliding groove, the position of the pin shaft is adjustable.

[0023] As a further scheme of the utility model: the locking piece is a bolt, the bolt is installed on the pin shaft, and one end of the bolt is threadedly connected with the sliding groove.

[0024] Through the setting of the bolt, the position of the pin shaft after adjustment can be locked.

[0025] As a further scheme of the utility model: the elastic cofferdam is a sealing ring.

[0026] Through the setting of the elastic cofferdam as a sealing ring, the sealing effect is better.

[0027] As a further scheme of the utility model: the gas outlet of the ventilation chamber is arranged on the top side surface of the lower die.

[0028] Through the setting of the gas outlet at the top side surface of the lower die, the pressing action of the upper die can be better adapted.

[0029] Compared with the prior art, the utility model has the following beneficial effects:

[0030] 1. Through the setting of the lower die and the elastic cofferdam, the lower die can not only support the battery cover plate, but also the gas outlet of the ventilation chamber on the lower die can be sealed with the battery cover plate, so that one end of the explosion-proof valve on the battery cover plate is arranged at the gas outlet, and the gas with gradually increased pressure is introduced into the gas inlet, so that the explosion-proof valve in the sealed environment is acted on, accurate testing of the explosion-proof valve is realized, and the testing is convenient.

[0031] 2. Through the setting of the limiting piece, the pin shaft in the limiting piece can pre-limit the battery cover plate, so that when the pole post through hole on the battery cover plate is sleeved on the pin shaft, one end of the explosion-proof valve falls into the gas outlet, the position of the battery cover plate is not adjusted repeatedly, and the debugging time is saved.

[0032] 3. By setting the pin shaft to be adjustable in position, the different positions of the explosion-proof valve on the battery cover plate of different types can be adapted, so that the test device has wide applicability. BRIEF DESCRIPTION OF DRAWINGS

[0033] The utility model will be further described below in combination with the drawings.

[0034] Figure 1 It is a battery cover plate three-dimensional structure schematic diagram in the prior art;

[0035] Figure 2 It is a three-dimensional structure schematic diagram of the upper die and the lower die before assembly in the utility model;

[0036] Figure 3 It is a three-dimensional structure schematic diagram of the lower die in Figure 2

[0037] Figure 4 It is a sectional structure schematic diagram of the upper die and the lower die before assembly in the utility model;

[0038] Figure 5 It is a three-dimensional structure schematic diagram of the upper die and the lower die after assembly in the utility model.

[0039] In the drawing: 101, battery cover plate; 102, explosion-proof valve; 103, pole through hole;

[0040] 1, lower die; 2, air chamber; 201, air inlet; 202, air outlet; 3, elastic cofferdam; 4, pin shaft; 5, lock piece; 6, upper die; 7, containing groove; 8, through hole; 9, sliding slot; 10, connecting piece. DETAILED DESCRIPTION

[0041] The technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0042] For example, Figures 2-5 ​As shown, a battery cover plate explosion-proof valve testing device, including upper die 6 and lower die 1, lower die 1 is provided with ventilation chamber 2, ventilation chamber 2 has air inlet 201 and air outlet 202, air inlet 201 and air outlet 202 are arranged on the side of lower die 1, in use, air inlet 201 is communicated with the air pipe; the side with air outlet 202 is provided with elastic cofferdam 3, and the elastic cofferdam 3 is located at the periphery of the air outlet 202, when the battery cover plate 101 to be detected is placed on the air outlet 202, and one end of the explosion-proof valve 102 is located in the elastic cofferdam 3, then the battery cover plate 101 is pressed on the air outlet 202 by using the upper die 6, and the upper die 6 and the lower die 1 are locked by using the connecting piece 10 (connecting bolt, etc.), at this time, the elastic cofferdam 3 deforms and can be tightly contacted with the battery cover plate 101, that is, the battery cover plate 101 seals the air outlet 202 well, and one end of the explosion-proof valve 102 is also located at the air outlet 202. In the subsequent test, the gas with gradually increasing pressure can be introduced into the air pipe, when the gas flows to the air outlet 202, the elastic cofferdam 3 and the battery cover plate 101 seal the air outlet 202, and then the gas at the air outlet 202 acts on the explosion-proof valve 102, which simulates the sudden high-pressure out-of-control state in the battery box, records the gas pressure value when the explosion-proof valve 102 explodes, determines the initial opening pressure lower limit value of the explosion-proof valve 102, and judges whether the gas pressure value when the explosion-proof valve 102 explodes is within the qualified threshold range.

[0043] As Figures 2-3 shown, in the process of placing the battery cover plate 101 on the air outlet 202, the position of the battery cover plate 101 needs to be adjusted until one end of the explosion-proof valve 102 on the battery cover plate 101 is placed in the elastic cofferdam 3, so that the battery cover plate 101 can be pressed by using the upper die 6. In order to faster realize that the battery cover plate 101 is arranged at the specified position of the air outlet 202, the utility model also includes a limiting piece for pre-limiting the battery cover plate 101, the limiting piece is arranged on the side of the same side as the air outlet 202, in the schematic diagram, the air inlet 201 is arranged on the circumferential side of the lower die 1, the air outlet 202 is arranged on the top side of the lower die 1, and correspondingly, the limiting piece is arranged on the top side of the lower die 1. It should be noted that, on the basis of arranging the upper die 6 and the lower die 1, the top side in the above-mentioned is the mold closing surface.

[0044] As Figure 3As shown, specifically, the limiting member includes a pin shaft 4 mounted on the top side, and the pin shaft 4 is matched in size with the pole post through hole 103 on the battery cover plate 101, and then in the process of placing the battery cover plate 101 on the lower mold 1, the position of the battery cover plate 101 can be limited by inserting the pin shaft 4 through the pole post through hole 103, so that after the battery cover plate 101 is placed on the pin shaft 4 through the pole post through hole 103, one end of the explosion-proof valve 102 on the battery cover plate 101 will fall into the elastic cofferdam 3, and there is no need to adjust the position of the battery cover plate 101 subsequently, which is convenient to use and saves debugging time.

[0045] For example Figure 3 As shown, further, since different types of battery cover plates 101 have different positions of the explosion-proof valve 102 arranged thereon, the pin shaft 4 is slidably arranged on the top side in the embodiment, and specifically, a sliding groove 9 for the pin shaft 4 to slide is formed on the top side, and a locking piece 5 for locking the top side is arranged on the pin shaft 4, and when testing the corresponding type of battery cover plate 101, the pin shaft 4 can be slidably adjusted on the top side until the pin shaft 4 is matched in position with the pole post through hole 103 on the battery cover plate 101, and after the adjustment is completed, the position of the pin shaft 4 can be locked by the locking piece 5. Preferably, the locking piece 5 is a bolt, which is mounted on the pin shaft 4 and has one end threadedly connected with the sliding groove 9 to lock the position of the pin shaft 4. Of course, the locking piece 5 is not limited to the above-mentioned arrangement, but can also be arranged as other conventional technical means in the prior art.

[0046] As Figure 4 As shown, under the above-mentioned arrangement of the pin shaft 4, in order for the upper mold 6 to be better matched with the lower mold 1 for assembly, a containing groove 7 for containing the pin shaft 4 is formed on the side of the upper mold 6 facing the air outlet 202. Meanwhile, in order for the explosion-proof valve 102 to be only subjected to the action of high-pressure gas during the testing process, a through hole 8 for exposing the explosion-proof valve 102 is also formed on the upper mold 6, and further, the through hole 8 can also be used as an observation hole.

[0047] It should be noted that the elastic cofferdam 3 in the utility model can be arranged as any one of a sealing ring, a sealing ring, a sealing ring derivative or a sealing ring derivative, as long as it can have a corresponding sealing effect.

[0048] The above has described one embodiment of the utility model in detail, but the content described is only a preferred embodiment of the utility model and cannot be considered as limiting the implementation range of the utility model. Any equivalent changes and improvements made within the scope of the utility model application shall still belong to the patent coverage range of the utility model.

Claims

1. A battery cover plate on the explosion-proof valve test device, characterized in that, The test device comprises a lower mold (1) with a venting chamber (2) thereon, and a gas outlet (202) of the venting chamber (2) is arranged on a mold closing surface of the lower mold (1), and the mold closing surface is provided with an elastic weir (3) at a position outside a periphery of the gas outlet (202), so that when a battery cover plate (101) is pressed against the gas outlet (202) and an end of an explosion-proof valve (102) is arranged in the elastic weir (3), the battery cover plate (101) is sealed against the gas outlet (202) by the elastic weir (3); the test device further comprises an upper mold (6) for pressing the battery cover plate (101) against the gas outlet (202), and the upper mold (6) is provided with a through hole (8) for exposing the explosion-proof valve (102).

2. A device for testing an explosion relief valve on a battery cover plate according to claim 1, characterized in that The test device further comprises a limiting member arranged on the mold closing surface, and the limiting member comprises a pin shaft (4) mounted on the mold closing surface, and the pin shaft (4) is matched in size with a pole through hole (103) on the battery cover plate (101).

3. A device for testing an explosion relief valve on a battery cover plate according to claim 2, characterized in that The pin shaft (4) is slidingly arranged on the mold closing surface, and the pin shaft (4) is provided with a locking member (5) lockable with the mold closing surface.

4. A device for testing an explosion relief valve on a battery cover plate according to claim 3, characterized in that The upper mold (6) is provided with a containing groove (7) on a side facing the gas outlet (202) for containing the pin shaft (4).

5. A device for testing an explosion relief valve on a battery cover plate according to any one of claims 2-4, characterized in that The mold closing surface is provided with a sliding groove (9) for sliding of the pin shaft (4).

6. A device for testing an explosion relief valve on a battery cover plate according to claim 3, wherein The locking member (5) is a bolt mounted on the pin shaft (4), and an end of the bolt is threadedly connected with the sliding groove (9).

7. A device for testing an explosion relief valve on a battery cover plate according to any one of claims 1-4, characterized in that, The elastic weir (3) is a sealing ring.

8. A device for testing an explosion relief valve on a battery cover plate according to any one of claims 1-4, characterized in that, The gas outlet (202) of the venting chamber (2) is arranged on a top side of the lower mold (1).

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