Operation Method of Explosion-Proof Valve Detection System and Explosion-Proof Valve Detection Process

Abstract

The present application discloses an explosion-proof valve detection system and an operation method of an explosion-proof valve detection process, which relates to the technical field of battery pack testing equipment. The explosion-proof valve detection system includes a target explosion-proof valve, a negative pressure device, an air supply device and an explosion-proof valve tooling; the explosion-proof valve tooling includes a sealing cover, an adsorbent and a first driving member; the sealing cover is arranged at one end of the target explosion-proof valve with a valve cover; the adsorbent is arranged in the sealing cover and connected to the negative pressure device; the negative pressure device performs a suction operation on the adsorbent so that the adsorbent adsorbs the valve cover under the action of negative pressure; the first driving member is connected to the adsorbent in a transmission manner and drives the adsorbent to move relative to the sealing cover so that the adsorbent drives the valve cover to open; the air supply device inflates the inner cavity of the sealing cover when the valve cover is opened to perform an air tightness test. This solution can conveniently realize the opening and closing of the valve cover by negative pressure adsorption when there is no iron sheet inside the valve cover and the valve cover is made of non-metallic material, so as to inflate the inside of the target explosion-proof valve, so that the air tightness test can be carried out efficiently.

Description

Technical Field

[0001] The present application relates to the technical field of battery pack testing equipment, and in particular to an explosion-proof valve detection system and an operating method of an explosion-proof valve detection process. Background Art

[0002] One of the cores of new energy electric vehicles is the battery pack. As the main power source of new energy electric vehicles, the performance of the battery pack is one of the factors affecting the quality of new energy electric vehicles. After the battery pack is assembled, it is necessary to conduct an airtightness test on the battery pack to ensure the safety and reliability of the battery pack.

[0003] The battery pack is equipped with an explosion-proof valve, which is used to provide a safe pressure release channel when the internal pressure of the battery pack rises abnormally. In the process of airtightness testing of the battery pack, it is necessary to use the test fixture to open and close the valve cover of the explosion-proof valve by magnetic attraction to inflate the battery pack. As the battery pack develops in the direction of lightweight design, the valve cover of the explosion-proof valve has gradually begun to eliminate the iron sheet. As a result, the existing test fixture can no longer open and close the valve cover by adsorbing the valve cover through magnetic parts, and manual intervention is required, which is extremely inconvenient to use. Summary of the invention

[0004] The main purpose of the present application is to provide an explosion-proof valve detection system, which aims to solve the technical problem that the existing explosion-proof valve airtightness testing tooling cannot open and close the valve cover by adsorbing the valve cover through magnetic parts, making it difficult to inflate the battery pack and complete the airtightness test.

[0005] To achieve the above-mentioned purpose, the explosion-proof valve detection system proposed in the present application includes a target explosion-proof valve, a negative pressure device, an air supply device and an explosion-proof valve tooling; the explosion-proof valve tooling includes:

[0006] A sealing cover, the sealing cover is arranged at one end of the target explosion-proof valve provided with a valve cover;

[0007] An adsorbent, the adsorbent is disposed in the sealing cover, and the adsorbent is connected to the negative pressure device; the negative pressure device is used to perform a suction operation on the adsorbent, so that the adsorbent adsorbs the valve cover under the action of negative pressure;

[0008] a first driving member, the first driving member being in driving connection with the adsorption member; the first driving member being used to drive the adsorption member to move relative to the sealing cover so that the adsorption member contacts the valve cover and drives the valve cover to open;

[0009] The air supply device is connected to the sealing cover, and is used to inflate the inner cavity of the sealing cover to perform an air tightness test when the valve cover is opened.

[0010] The explosion-proof valve detection system provided by this application, after covering the sealing cover on one end of the target explosion-proof valve where the valve cover is located, can drive the suction attachment to contact the valve cover through the first driving member, and then make the suction attachment attract and fit with the valve cover through the negative pressure suction effect. The first driving member then drives the suction attachment to move away from the target explosion-proof valve to drive the valve cover attracted to the suction attachment to open, and then air can be filled into the interior of the valve body of the target explosion-proof valve for subsequent airtightness testing; and if it is necessary to close the valve cover, only need to stop the negative pressure suction operation on the suction attachment, so that the valve cover is separated from the suction attachment and re-covered on the valve body; based on the above settings, it is possible to conveniently open and close the valve cover by means of negative pressure adsorption in the case where there is no iron sheet inside the valve cover and the valve cover is made of non-metallic material, so that the airtightness testing can be carried out smoothly and efficiently.

[0011] In some embodiments, the explosion-proof valve tooling further includes a fixed bracket, which is used for fixedly connecting with the valve body of the target explosion-proof valve, and the sealing cover is movably connected to the fixed bracket.

[0012] By setting the fixed bracket, it can play a guiding role in the movement of the sealing cover.

[0013] In some embodiments, the explosion-proof valve tooling further includes a second driving member, which is in transmission connection with the sealing cover; the second driving member is used to drive the sealing cover to move along a first direction so that the sealing cover covers or moves away from one end of the target explosion-proof valve where the valve cover is located.

[0014] The second driving member can drive the sealing cover to move relative to the fixed bracket to make room for the assembly space of the explosion-proof valve, making the assembly of the explosion-proof valve and the fixed bracket more convenient. At the same time, the first driving member and the second driving member can respectively control the movement of the suction attachment and the sealing cover to ensure that the suction attachment can keep in contact with the valve cover when the valve cover needs to be opened.

[0015] In some embodiments, a flexible buffer layer is provided at the opening of the sealing cover; when the sealing cover covers one end of the target explosion-proof valve where the valve cover is located, the flexible buffer layer is used to fit with the target explosion-proof valve.

[0016] By providing a flexible buffer layer at the opening of the sealing cover, the flexible buffer layer can play an isolation and buffering role, and can effectively relieve the impact and wear caused when the sealing cover contacts the target explosion-proof valve.

[0017] In some embodiments, the explosion-proof valve tooling further includes an inflation pipeline, one end of the inflation pipeline is communicated with the inner cavity of the sealing cover, and the other end of the inflation pipeline is used to connect a gas supply device.

[0018] By setting up the inflation pipeline and the air supply device, the explosion-proof valve tooling can not only open and close the valve cover, but also complete the inflation operation of the battery pack at the same time, thus further improving the convenience and efficiency of the airtightness test.

[0019] In some embodiments, the explosion-proof valve tooling further includes a first guide rod, which is slidably disposed in the sealing cover along a first direction. One end of the first guide rod is connected to the suction member, and the other end of the first guide rod is connected to the first driving member; the first driving member is configured to drive the first guide rod to move along the first direction to drive the suction member to move.

[0020] The first driving member can drive the suction member to move through the first guide rod, thus reducing the difficulty of realizing the movement of the suction member driven by the first driving member.

[0021] In some embodiments, the explosion-proof valve tooling further includes a first elastic member, which is sleeved on the first guide rod, and the first elastic member is elastically supported between the suction member and the sealing cover.

[0022] The first elastic member can provide an elastic acting force to the suction member to ensure that the suction member can firmly abut against the valve cover.

[0023] In some embodiments, the explosion-proof valve tooling further includes a second driving member and a second guide rod, and the second driving member is in transmission connection with the sealing cover; the second driving member is configured to drive the sealing cover to move along the first direction so that the sealing cover covers or moves away from one end of the target explosion-proof valve provided with the valve cover;

[0024] The second guide rod is slidably disposed in the fixed bracket along the first direction. One end of the second guide rod is connected to the sealing cover, and the other end of the second guide rod is connected to the second driving member; the second driving member is configured to drive the second guide rod to move along the first direction to drive the sealing cover to move.

[0025] The second driving member can drive the sealing cover to move through the second guide rod, thereby reducing the difficulty of realizing the movement of the sealing cover driven by the second driving member.

[0026] In some embodiments, the explosion-proof valve tooling further includes a second elastic member, which is sleeved on the second guide rod, and the second elastic member is elastically supported between the sealing cover and the fixed bracket.

[0027] The second elastic member can provide an elastic acting force to the sealing cover to make the sealing cover firmly fit on one end of the fixed bracket.

[0028] In some embodiments, the second driving member includes a second cam portion and a second holding portion, the second cam portion is rotatably connected to the second guide rod around a second axis, the second cam portion abuts against the fixed bracket, and the second axis is perpendicular to the first direction; the second holding portion is connected to the second cam portion.

[0029] The tester can drive the sealing cover to move by manually rotating the second cam portion with the help of the second gripping portion, thereby reducing the operating difficulty of the tester.

[0030] In some embodiments, the explosion-proof valve tooling further includes a first guide rod, which is slidably disposed in the sealing cover along the first direction, one end of the first guide rod is connected to the adsorption member, and the other end of the first guide rod is connected to the first driving member; the first driving member is used to drive the first guide rod to move along the first direction to drive the adsorption member to move;

[0031] The second guide rod is a hollow structure, and the first guide rod is slidably connected to the inner cavity of the second guide rod along the first direction.

[0032] The second guide rod can be used as an assembly base for the first guide rod, so that the overall structure of the explosion-proof valve tooling is more compact and occupies less space.

[0033] In some embodiments, the first driving member includes a first cam portion and a first holding portion, the first cam portion is rotatably connected to an end of the first guide rod facing away from the adsorption member around a first axis, the first cam portion abuts against the second guide rod, and the first axis is perpendicular to the first direction; the first holding portion is connected to the first cam portion.

[0034] The tester can drive the adsorption component to move by manually rotating the first cam portion with the help of the first gripping portion, thereby reducing the operating difficulty of the tester.

[0035] In some embodiments, the adsorption component is provided with an adsorption cavity, the first guide rod is provided with an adsorption channel, and the second guide rod is provided with a connecting channel; the adsorption cavity is used to be set toward the valve cover, one end of the adsorption channel is connected with the adsorption cavity, and the other end of the adsorption channel is connected with one end of the connecting channel, and the other end of the connecting channel is used to connect to a negative pressure device.

[0036] By setting up an auxiliary channel and a connecting channel, the connection between the external negative pressure device and the internal adsorption component can be achieved without affecting the basic structure and connection matching relationship of the first guide rod and the second guide rod, so that the negative pressure suction action of the adsorption component can be carried out normally.

[0037] In some embodiments, the explosion-proof valve tooling further includes a fixing bracket for fixedly connecting with the valve body of the target explosion-proof valve, and the sealing cover is movably connected to the fixing bracket; the first driving member and the second driving member are both arranged outside the fixing bracket.

[0038] Based on the above design, the assembly of the first driving member and the second driving member can be made more convenient.

[0039] In some embodiments, the fixing bracket includes a top wall and a side wall, and the side wall surrounds the periphery of the top wall to form a receiving cavity. The sealing cover is arranged in the receiving cavity, and the receiving cavity is used for receiving at least a part of the target explosion-proof valve.

[0040] By setting the fixing bracket to include a top wall and a side wall, it is convenient to load the valve body of the target explosion-proof valve into the receiving cavity of the fixing bracket, realizing the connection between the target explosion-proof valve and the explosion-proof valve tooling.

[0041] In some embodiments, a limiting flange protrudes at the opening of the end of the side wall away from the top wall, and the limiting flange is used for snap-fitting into the limiting groove of the target explosion-proof valve.

[0042] Through the cooperation between the limiting flange and the limiting groove, the explosion-proof valve can be stably snap-fitted into the fixing bracket, improving the connection tightness between the explosion-proof valve and the fixing bracket.

[0043] In some embodiments, the explosion-proof valve tooling further includes an inflation pipeline slidably penetrating through the top wall along a first direction. One end of the inflation pipeline is communicated with the inner cavity of the sealing cover, and the other end of the inflation pipeline is used for connecting a gas supply device.

[0044] Since the sealing cover moves relative to the fixing bracket along the first direction, when the inflation pipeline also slidably penetrates through the top wall along the first direction, it can ensure that the gas supply device can transport external gas to the inner cavity of the sealing cover through the inflation pipeline while avoiding the inflation pipeline from hindering the relative movement between the sealing cover and the fixing bracket.

[0045] In some embodiments, the negative pressure device is connected to the sealing cover, and the negative pressure device is used for pumping out the gas in the inner cavity of the sealing cover.

[0046] Through the cooperation between the negative pressure device and the gas supply device, the gas supply operation and the exhaust operation of the sealing cover can be realized, enabling the air pressure condition in the inner cavity of the sealing cover to better meet the actual test requirements.

[0047] In some embodiments, the air supply device is connected to the suction attachment; the air supply device is configured to inflate the suction attachment so that the suction attachment is separated from the valve cover under the action of positive pressure.

[0048] After the air supply device finishes inflating the battery pack and completes the detection of the sealing performance of the battery pack, the negative pressure device stops the negative pressure suction operation on the suction attachment. At this time, the air supply device can be used to inflate the suction attachment again, so as to ensure that the valve cover can be smoothly separated from the suction attachment under the action of positive pressure and push the valve cover to re-cover on the valve body.

[0049] In some embodiments, the explosion-proof valve detection system further includes a second pressure sensor, and the second pressure sensor is configured to obtain a third pressure value in the connection path between the negative pressure device and the suction attachment.

[0050] By setting the second pressure sensor to obtain the third pressure value in the connection path between the negative pressure device and the suction attachment, it is possible to judge whether the suction attachment has been firmly attached to the valve cover and whether the suction attachment has successfully driven the valve cover to open according to the magnitude and change of the third pressure value during the negative pressure suction operation on the suction attachment by the negative pressure device; thus, it can help the tester more intuitively and accurately control the corresponding test links, and can intervene in time when the third pressure value does not conform to the preset situation, and eliminate abnormalities and faults in a timely and accurate manner to avoid affecting the subsequent test process.

[0051] In some embodiments, the explosion-proof valve detection system further includes a first pressure sensor, and the first pressure sensor is configured to obtain a first pressure value in the connection path between the air supply device and the sealing cover.

[0052] By setting the first pressure sensor to obtain the first pressure value in the connection path between the air supply device and the sealing cover, it is possible to judge whether there is air leakage in the sealing cover, the target explosion-proof valve, and the battery pack according to the magnitude and change of the first pressure value during the inflation operation of the inner cavity of the sealing cover by the air supply device, and stop the inflation operation after ensuring that the gas volume in the corresponding chamber reaches the preset value, so as to help the tester more intuitively and accurately control the corresponding test links and improve the accuracy of the test results.

[0053] In some embodiments, the explosion-proof valve detection system further includes a first pressure sensor, and the first pressure sensor is configured to obtain a second pressure value in the connection path between the negative pressure device and the sealing cover.

[0054] By setting a first pressure sensor to obtain a second pressure value in the connection path between the negative pressure device and the sealing cover, it is possible to judge whether there is air leakage according to the magnitude and change of the second pressure value during the process of performing negative pressure suction on the inner cavity of the sealing cover through the negative pressure device to evacuate the gas in the sealing cover, so as to stop the negative pressure suction operation after ensuring that the gas in the sealing cover has been completely evacuated, thereby helping the tester to more intuitively and accurately control the corresponding test link and improving the accuracy of the test results.

[0055] In some embodiments, the explosion-proof valve detection system further includes a second pressure sensor, and the second pressure sensor is used to obtain a fourth pressure value in the connection path between the air supply device and the suction accessory.

[0056] By setting a second pressure sensor to obtain a fourth pressure value in the connection path between the air supply device and the suction accessory, it is possible to judge whether the valve cover has been successfully separated from the suction accessory according to the magnitude and change of the fourth pressure value during the process of inflating the suction accessory through the air supply device to ensure the separation of the valve cover from the suction accessory, thereby helping the tester to more intuitively and accurately control the corresponding test link and ensuring the normal progress of the test process.

[0057] In some embodiments, the explosion-proof valve detection system further includes a pressure tester, and the pressure tester is used to obtain the pressure change amount in the inner cavity of the sealing cover within a preset time.

[0058] By setting the pressure tester, it is possible to detect the sealing performance of the battery pack and the sealing performance of the target explosion-proof valve itself.

[0059] The present application also proposes an operation method for an explosion-proof valve detection process, and the operation method for the explosion-proof valve detection process includes the following steps:

[0060] Drive the suction accessory to fit with the valve cover of the target explosion-proof valve, so that at least part of the suction accessory forms a first cavity with the valve cover;

[0061] Perform a suction operation on the first cavity;

[0062] Drive the suction accessory to move to drive the valve cover to open and expose the vent port sealed by the valve cover.

[0063] Based on the above settings, it is possible to conveniently open the valve cover by negative pressure adsorption through the suction accessory in the case where there is no iron sheet inside the valve cover and the valve cover is made of non-metallic material, which provides convenience for subsequent inflation operations and airtightness detection processes.

[0064] In some embodiments, after the step of performing a suction operation on the first cavity, the operation method for the explosion-proof valve detection process further includes the following steps:

[0065] After a preset time for the suction operation is completed, obtain a third pressure value in the first cavity;

[0066] The step of driving the suction member to move includes:

[0067] When the third pressure value is not greater than the first pressure threshold, drive the suction member to move;

[0068] When the third pressure value is greater than the first pressure threshold, output a first abnormal prompt message.

[0069] After a preset time for the suction operation is completed, judge whether the third pressure value is greater than the first pressure threshold, and then it can be determined whether an abnormal condition occurs. If there is no abnormal condition, it is determined that the suction member has been tightly suctioned to the valve cover. At this time, the suction member can be driven to open the valve cover and perform subsequent test processes; if an abnormal condition occurs, the tester can be reminded to check and adjust the assembly situation in time by outputting a first abnormal prompt message.

[0070] In some embodiments, after the step of driving the suction member to move to drive the valve cover to open and expose the vent port sealed by the valve cover, the operation method of the explosion-proof valve detection process further includes the following steps:

[0071] When the third pressure value increases to a second pressure threshold, output a second abnormal prompt message; the second pressure threshold is greater than the first pressure threshold.

[0072] During the process of driving the suction member to move, it can be judged whether the valve cover remains in contact with the suction member by judging whether the third pressure value increases to the second pressure threshold, so as to judge whether the suction member successfully drives the valve cover to open; when the suction member fails to drive the valve cover to open normally, the tester is reminded to intervene and handle it in time by outputting a second abnormal prompt message, so as not to affect the subsequent test process.

[0073] In some embodiments, after the step of driving the suction member to move to drive the valve cover to open and expose the vent port sealed by the valve cover, the operation method of the explosion-proof valve detection process further includes the following steps:

[0074] Inflate the inside of the target explosion-proof valve through the vent port.

[0075] Inflating the inside of the target explosion-proof valve through the vent port can provide a basis for subsequent airtightness detection processes.

[0076] In some embodiments, before the step of driving the suction member to fit with the valve cover of the target explosion-proof valve, the operation method of the explosion-proof valve detection process further includes the following steps:

[0077] A second cavity is formed by covering one end of the target explosion-proof valve with a valve cover provided with a valve cap; the adsorbent is arranged in the second cavity;

[0078] The step of inflating the inside of the target explosion-proof valve through the air vent includes:

[0079] Inflate the second cavity so that the inflated gas enters the inside of the target explosion-proof valve through the air vent.

[0080] Based on the above settings, the gas supply device can be integrated on the sealing cover, and there is no need to connect the gas supply device at the air vent after the valve cap is opened, thereby further improving the convenience and efficiency of the airtightness test.

[0081] In some embodiments, the step of inflating the second cavity so that the inflated gas enters the inside of the target explosion-proof valve through the air vent includes:

[0082] Obtain the first pressure value of the second cavity;

[0083] When the first pressure value reaches the third pressure threshold, stop inflating the second cavity.

[0084] By judging whether the first pressure value of the second cavity reaches the third pressure threshold, it is possible to accurately determine whether the inflation operation is completed; when it is confirmed that the inflation amount has reached the preset level, the inflation operation is stopped.

[0085] In some embodiments, after the step of inflating the second cavity so that the inflated gas enters the inside of the target explosion-proof valve through the air vent, the operation method of the explosion-proof valve detection process further includes the following steps:

[0086] Obtain the first pressure change amount of the second cavity within a preset time;

[0087] When the first pressure change amount reaches the first change amount threshold, output a third abnormal prompt message.

[0088] After inflation, in the case of normal sealing, the air pressure in the closed second cavity jointly formed by the inside of the battery pack, the inside of the target explosion-proof valve, and the inner cavity of the sealing cover should not change significantly within a certain period of time; based on this consideration, in this embodiment, by detecting the first pressure change amount of the second cavity within a preset time and making a judgment, if the first pressure change amount reaches the first change amount threshold, it means that the air pressure in the second cavity has changed significantly, and it is determined that the battery pack may have a sealing abnormality resulting in gas leakage, so that the tester can be reminded to intervene and handle it in time.

[0089] In some embodiments, before the step of obtaining the first pressure change amount of the second cavity within a preset time, the operation method of the explosion-proof valve detection process further includes the following steps:

[0090] Let the target explosion-proof valve stand still for a preset time.

[0091] After the inflation is completed, let the target explosion-proof valve stand still for a preset time to make the air flow in the second cavity tend to be stable and the air pressure tend to be balanced, and then obtain the first pressure change amount. In this way, the accuracy of the final airtightness detection result can be further improved.

[0092] In some embodiments, after the step of inflating the inside of the target explosion-proof valve through the air vent, the operation method of the explosion-proof valve detection process further includes the following steps:

[0093] Stop the suction operation on the suction attachment, so that the valve cover is separated from the suction attachment and re-capped on the air vent.

[0094] After the inflation operation and the airtightness detection operation are completed, the valve cover needs to be closed; at this time, stopping the suction operation on the suction attachment can make the valve cover lose the negative pressure effect, so that the valve cover can be re-covered on the target explosion-proof valve under the action of gravity or the acting force of other connecting devices (such as the elastic acting force of a spring), thereby realizing the automatic capping of the valve cover.

[0095] In some embodiments, the step of stopping the suction operation on the suction attachment, separating the valve cover from the suction attachment and re-capping the valve cover on the air vent includes:

[0096] Inflate the suction attachment to separate the valve cover from the suction attachment under the positive pressure and re-cap the valve cover on the air vent;

[0097] Stop the inflation operation on the suction attachment.

[0098] While stopping the negative pressure suction operation on the suction attachment, inflate the suction attachment. In this way, the positive pressure can ensure that the valve cover can be smoothly separated from the suction attachment and the valve cover can be re-covered on the target explosion-proof valve under the positive pressure.

[0099] In some embodiments, before the step of driving the suction attachment to fit with the valve cover of the target explosion-proof valve, the operation method of the explosion-proof valve detection process further includes the following steps:

[0100] Cover the end of the target explosion-proof valve provided with the valve cover with a sealing cover to form a second cavity; the suction attachment is arranged in the second cavity;

[0101] After the step of stopping the suction operation on the adsorbing member, separating the valve cover from the adsorbing member and re - covering it on the vent port, the operation method of the explosion - proof valve detection process further includes the following steps:

[0102] Discharge the gas in the second cavity to the outside.

[0103] After the valve cover is re - closed, the interior of the battery pack and the interior of the target explosion - proof valve form a first closed chamber, and the inner cavity of the sealing cover forms a second cavity. When the seal is normal (specifically, when the seal between the valve cover and the valve body is normal), the first closed chamber and the second cavity are not connected to each other; at this time, the gas in the inner cavity of the sealing cover can be emptied (that is, the gas in the second cavity is discharged to the outside), so that a pressure difference can be formed between the first closed chamber and the second cavity. Subsequently, by obtaining the pressure change of the first closed chamber and / or the second cavity, it can be determined whether there is gas exchange between the first closed chamber and the second cavity, thus providing a basis for finally determining the sealing performance of the target explosion - proof valve.

[0104] In some embodiments, the step of discharging the gas in the second cavity to the outside includes:

[0105] Obtain the second pressure value of the second cavity;

[0106] When the second pressure value reaches the fourth pressure threshold, stop discharging the gas in the second cavity to the outside.

[0107] During the process of emptying the gas in the second cavity, the air pressure in the second cavity will gradually decrease; by obtaining the second pressure value of the second cavity and comparing it with the preset fourth pressure threshold, the exhaust operation can be stopped after ensuring that the gas in the second cavity has been emptied to the preset level (that is, when the second pressure value reaches the fourth pressure threshold), which can help the tester more accurately control the above - mentioned exhaust process.

[0108] In some embodiments, before the step of driving the adsorbing member to fit with the valve cover of the target explosion - proof valve, the operation method of the explosion - proof valve detection process further includes the following steps:

[0109] Form a second cavity by covering the sealing cover on one end of the target explosion - proof valve provided with the valve cover; the adsorbing member is arranged in the second cavity, and the adsorption end of the adsorbing member is communicated with the second cavity;

[0110] After the step of stopping the suction operation on the adsorbing member, separating the valve cover from the adsorbing member and re - covering it on the vent port, the operation method of the explosion - proof valve detection process further includes the following steps:

[0111] Perform a suction operation on the adsorbing member to discharge the gas in the second cavity to the outside.

[0112] This embodiment provides another way to perform a negative pressure suction operation on the inner cavity of the sealing cover; when the adsorbing member is separated from the valve cover, the adsorption end of the adsorbing member (specifically, the adsorption concave cavity of the adsorbing member) communicates with the inner cavity of the sealing cover. At this time, a negative pressure device can be used to perform a negative pressure suction operation on the adsorbing member to extract the gas in the inner cavity of the sealing cover through the adsorbing member, so as to realize the evacuation of the gas in the second cavity in the same way.

[0113] In some embodiments, the step of performing a suction operation on the adsorbing member to discharge the gas in the second cavity to the outside includes:

[0114] Obtain the third pressure value of the suction channel of the adsorbing member;

[0115] When the third pressure value reaches the fourth pressure threshold, stop performing the suction operation on the adsorbing member.

[0116] During the process of performing a negative pressure suction operation on the adsorbing member through a negative pressure device to evacuate the gas in the inner cavity of the sealing cover, the air pressure in the inner cavity of the sealing cover will gradually decrease. Since the adsorption end of the adsorbing member (specifically, the adsorption concave cavity of the adsorbing member) communicates with the inner cavity of the sealing cover, the third pressure value in the connection path between the negative pressure device and the adsorbing member (that is, the suction channel of the adsorbing member described above) will also gradually decrease; at this time, the above-mentioned third pressure value is obtained through the second pressure sensor, which can intuitively judge whether there is air leakage or other situations during the suction process, and the negative pressure suction operation can be stopped after ensuring that the gas in the sealing cover has been evacuated to a preset level (that is, when the third pressure value reaches the fourth pressure threshold), so as to help the tester more accurately control the above-mentioned negative pressure suction process.

[0117] In some embodiments, after the step of discharging the gas in the second cavity to the outside, the operation method of the explosion-proof valve detection process further includes the following steps:

[0118] Let the target explosion-proof valve stand still for a preset time.

[0119] Since gas is fluid, within a period of time after discharging the gas in the second cavity to the outside, the air flow in the second cavity is still in an unstable state, and there may be deviations in air pressure detection at this time, which may lead to misjudgment. Based on this situation, in this embodiment, the target explosion-proof valve is left standing for a preset time after the exhaust is completed, so that the air flow in the second cavity tends to be stable and the air pressure tends to be balanced, and then the pressure tester can be used to detect the pressure change of the second cavity, so as to further improve the accuracy of the final airtightness detection result.

[0120] In some embodiments, after the step of discharging the gas in the second cavity outwards, the operation method of the explosion-proof valve detection process further includes the following steps:

[0121] Obtain the second pressure change amount of the second cavity within a preset time;

[0122] When the second pressure change amount reaches the second change amount threshold, output a fourth abnormal prompt message.

[0123] In this embodiment, after emptying the gas in the second cavity, by obtaining the second pressure change amount of the second cavity within a preset time and making a judgment, if the second pressure change amount reaches the second change amount threshold, it indicates that there may be a sealing abnormality at the connection between the valve cover and the valve body, resulting in the gas in the first closed chamber leaking into the second cavity, causing the air pressure in the second cavity to increase abnormally. At this time, the tester can be reminded to intervene and handle in time, so as to accurately detect the sealing performance of the target explosion-proof valve itself. Description of the Drawings

[0124] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0125] Figure 1 Schematic three-dimensional structure diagram of the explosion-proof valve tooling in an embodiment of the explosion-proof valve detection system of the present application;

[0126] Figure 2 Schematic cross-sectional structure diagram of the adsorption member and the valve cover when they are not in contact in an embodiment of the explosion-proof valve detection system of the present application;

[0127] Figure 3 Schematic cross-sectional structure diagram of the adsorption member and the valve cover when they are in contact in an embodiment of the explosion-proof valve detection system of the present application;

[0128] Figure 4 Schematic cross-sectional structure diagram of the adsorption member driving the valve cover to open in an embodiment of the explosion-proof valve detection system of the present application;

[0129] Figure 5 Schematic connection structure diagram of the adsorption member and the valve cover when they are in contact in an embodiment of the explosion-proof valve detection system of the present application;

[0130] Figure 6 Schematic connection structure diagram of the adsorption member driving the valve cover to open in an embodiment of the explosion-proof valve detection system of the present application;

[0131] Figure 7Schematic diagram of the connection structure after the valve cover and the adsorbing component are separated in an embodiment of the explosion-proof valve detection system of the present application;

[0132] Figure 8 Schematic diagram of the process of an embodiment of the operation method of the explosion-proof valve detection process of the present application.

[0133] Explanation of the reference numerals in the drawings:

[0134] 1. Target explosion-proof valve; 101. Valve body; 102. Valve cover; 1011. Limit groove;

[0135] 2. Battery pack;

[0136] 3. Sealing cover; 301. Flexible buffer layer;

[0137] 4. Adsorbing component; 401. Adsorption cavity;

[0138] 5. First driving member; 501. First cam portion; 502. First holding portion; 5011. Second limiting surface; 5012. Third limiting surface; 5013. Fourth limiting surface;

[0139] 6. Fixed bracket; 601. Top wall; 602. Side wall; 603. Accommodating cavity; 6021. Avoidance opening; 6022. Limiting flange;

[0140] 7. Second driving member; 701. Second cam portion; 702. Second holding portion;

[0141] 8. Inflation pipeline; 9. Gas supply device; 10. Negative pressure device;

[0142] 11. First guide rod; 1101. Adsorption channel;

[0143] 12. First elastic member;

[0144] 13. Second guide rod; 1301. Connection channel;

[0145] 14. Second elastic member;

[0146] 15. First pressure sensor; 16. Second pressure sensor; 17. Pressure tester; 18. First valve; 19. Second valve; 20. Third valve; 21. Fourth valve.

[0147] The realization, functional features and advantages of the purpose of the present application will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0148] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0149] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present application, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0150] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0151] The battery pack includes a box body and battery cells disposed in the box body. An explosion-proof valve is usually provided on the box body. The explosion-proof valve is a component that actuates to release the internal pressure or temperature when the internal pressure or temperature of the battery pack reaches a predetermined threshold. When the internal pressure or temperature of the battery pack reaches the threshold, the explosion-proof valve performs an action, thereby forming an opening or channel for the internal pressure or temperature to be released.

[0152] The explosion-proof valve includes a valve body, a valve cover and a spring. The valve cover blocks the opening of the valve body under the action of the spring. When the internal pressure or temperature of the battery pack reaches the threshold, the valve cover is opened under the action of the internal pressure of the battery pack, so that the opening of the valve body communicates the inside of the battery pack with the outside, for the internal pressure or temperature of the battery pack to be released.

[0153] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. In this context, new energy electric vehicles have become an important part of the sustainable development of the automotive industry due to their energy-saving and environmental protection advantages. For electric vehicles, battery technology is also an important factor related to their development.

[0154] After the battery pack is assembled, its air tightness needs to be tested to determine the waterproof and dustproof capabilities of the battery pack and ensure the safety and reliability of the battery pack. During the air tightness test of the battery pack, the explosion-proof valve cover needs to be opened and closed through the test tooling to inflate and seal the battery pack, so that the purpose of testing the air tightness of the battery pack can be achieved by testing the internal pressure of the battery pack.

[0155] Traditional explosion-proof valves have iron sheets inside the valve cover, and the test tool can use magnetic parts to absorb the iron sheet and then pull the valve cover to open and close the valve cover. However, as battery packs move towards lightweight design, the iron sheet inside the valve cover has gradually been eliminated, and the valve cover is made of non-metallic materials. As a result, the existing test tool can no longer absorb the valve cover through magnetic parts to open and close the valve cover, and manual intervention is required, which is extremely inconvenient to use.

[0156] Based on the above problems, in order to conveniently realize the opening and closing of the non-metallic valve cover during the air tightness test, the present application provides an explosion-proof valve detection system, please refer to Figures 1 to 5 The explosion-proof valve detection system includes a target explosion-proof valve 1, a negative pressure device 10, an air supply device 9 and an explosion-proof valve tooling; the explosion-proof valve tooling includes:

[0157] A sealing cover 3, the sealing cover 3 is used to cover an end of the target explosion-proof valve 1 provided with a valve cover 102;

[0158] The adsorption member 4 is disposed in the sealing cover 3 and is connected to the negative pressure device 10; the negative pressure device 10 is used to perform a suction operation on the adsorption member 4 so that the adsorption member 4 adsorbs the valve cover 102 under the action of negative pressure;

[0159] A first driving member 5, the first driving member 5 is in driving connection with the adsorption member 4; the first driving member 5 is used to drive the adsorption member 4 to move relative to the sealing cover 3, so that the adsorption member 4 contacts the valve cover 102 and drives the valve cover 102 to open;

[0160] The air supply device 9 is connected to the sealing cover 3 and is used to inflate the inner cavity of the sealing cover 3 to perform an air tightness test when the valve cover 102 is opened.

[0161] Specifically, the shape of the adsorption component 4 can be cylindrical, ring-shaped, rectangular, etc. The part of the adsorption component 4 used to contact the valve cover 102 constitutes the adsorption end, and the adsorption end may include one or more surfaces. The adsorption end can be connected to the external negative pressure device 10 through a corresponding pipe or channel to achieve adsorption of the valve cover 102 under the suction action of the negative pressure device 10; taking the channel as an example, a channel for gas circulation can be opened inside the adsorption component 4, one end of the channel is connected to the adsorption end, and the other end of the channel passes through the outside and is connected to the negative pressure device 10.

[0162] It should be noted that under the drive of the first driving member 5, the adsorbing member 4 can move relative to the sealing cover 3 inside the sealing cover 3, and the valve cover 102 will be driven to open only after the adsorbing end of the adsorbing member 4 contacts the top surface of the valve cover 102.

[0163] The first driving member 5 can be a driving member with linear reciprocating motion, such as a piston cylinder, a linear motor, etc. Exemplarily, the first driving member 5 is a piston cylinder, and the piston rod of the piston cylinder is connected to a first adapter. The first adapter penetrates through the sealing cover 3 and one end of it is connected to the adsorbing member 4, and the first adapter can slide along the first direction (i.e., Figure 1 the X direction shown); thus, when the piston cylinder reciprocates, the adsorbing member 4 can be driven to move through the first adapter.

[0164] The first driving member 5 can also be an eccentric cam. The eccentric cam is rotatably connected to a first adapter. The first adapter penetrates through the sealing cover 3 and one end of it is connected to the adsorbing member 4, and the first adapter can slide along the first direction (i.e., Figure 1 the X direction shown); thus, when the eccentric cam rotates, the adsorbing member 4 can be driven to move through the first adapter. It should be noted that the eccentric cam can be rotated by a driving device such as a motor, or can also be rotated manually by a tester.

[0165] During the actual airtightness test, after the sealing cover 3 covers one end of the target explosion-proof valve 1 with the valve cover 102, the valve cover 102 is located in the closed chamber formed by the enclosure of the sealing cover 3 and the surface of the target explosion-proof valve 1; the first driving member 5 first drives the suction member 4 to contact the valve cover 102, and then makes the suction member 4 attracted to the valve cover 102 through the negative pressure suction effect. The first driving member 5 then drives the suction member 4 to move away from the target explosion-proof valve 1 to drive the valve cover 102 attracted to the suction member 4 to open; after the valve cover 102 is opened, air can be filled into the valve body 101 of the target explosion-proof valve 1, so that the gas passes through the valve body 101 and is filled into the battery pack 2, and then the airtightness test can be carried out. It should be noted that the sealing cover 3 and the target explosion-proof valve 1 are in a sealed connection. Therefore, after the valve cover 102 is opened, a closed chamber can be formed between the inside of the battery pack 2, the inside of the valve body 101 of the target explosion-proof valve 1 and the inner cavity of the sealing cover 3. The airtightness test can be carried out in the state where the valve cover 102 is opened after the inflation is completed. At this time, the sealing performance of the battery pack 2 is detected; it is also possible to stop the negative pressure suction operation on the suction member 4 after the inflation is completed, separate the valve cover 102 from the suction member 4 and re-cover it on the valve body 101, so that a closed chamber is formed between the inside of the battery pack 2 and the inside of the valve body 101 of the target explosion-proof valve 1, and a closed chamber is also formed in the inner cavity of the sealing cover 3, and then the airtightness test is carried out. At this time, the sealing performance of the target explosion-proof valve 1 itself is detected; of course, in actual applications, the above two methods can also be used simultaneously for the airtightness test to obtain more comprehensive test results, which are not limited here.

[0166] It can be seen that for the explosion-proof valve detection system provided in this embodiment, after the sealing cover 3 covers one end of the target explosion-proof valve 1 with the valve cover 102, the first driving member 5 can be used to drive the suction member 4 to contact the valve cover 102, and then the suction member 4 is attracted to the valve cover 102 through the negative pressure suction effect of the negative pressure device 10. The first driving member 5 then drives the suction member 4 to move away from the target explosion-proof valve 1 to drive the valve cover 102 attracted to the suction member 4 to open, and then the air supply device 9 can be used to fill the inside of the valve body 101 of the target explosion-proof valve 1 with air for subsequent airtightness tests; and if the valve cover 102 needs to be closed, only the negative pressure suction operation on the suction member 4 needs to be stopped, so that the valve cover 102 is separated from the suction member 4 and re-covered on the valve body 101; based on the above settings, the valve cover 102 can be conveniently opened and closed by means of negative pressure adsorption in the case where no iron sheet is provided inside the valve cover 102 and the valve cover 102 is made of non-metallic material, so that the airtightness test can be carried out smoothly and efficiently.

[0167] In some embodiments, referring to Figures 1 to 4 , the explosion-proof valve tooling further includes a fixing bracket 6. The fixing bracket 6 is used for fixedly connecting with the valve body 101 of the target explosion-proof valve 1, and the sealing cover 3 is movably connected to the fixing bracket 6.

[0168] The fixed bracket 6 can be fixedly connected to the valve body 101 through a spring clip, or can be fixedly connected to the valve body 101 by providing an opening into which the valve body 101 can extend and forming a clamping block on the inner side of the opening to cooperate with the outer edge of the valve body 101.

[0169] The fixed bracket 6 can guide the movement of the sealing cover 3.

[0170] In some embodiments, referring to Figures 1 to 4 , the explosion-proof valve tooling further includes a second driving member 7, and the second driving member 7 is in transmission connection with the sealing cover 3; the second driving member 7 is used to drive the sealing cover 3 to move along the first direction (i.e., the Figure 1 shown X direction) so that the sealing cover 3 covers or moves away from one end of the target explosion-proof valve 1 provided with the valve cover 102.

[0171] The second driving member 7 can be a driving member with a linear reciprocating motion, such as a piston cylinder, a linear motor, etc. Exemplarily, the second driving member 7 is a piston cylinder, and the piston rod of the piston cylinder is connected to a second adapter. The second adapter passes through the fixed bracket 6 and one end is connected to the sealing cover 3, and the second adapter can slide along the first direction (i.e., the Figure 1 shown X direction). The reciprocating motion of the piston cylinder can drive the sealing cover 3 to move through the second adapter.

[0172] It should be noted that the first adapter and the second adapter can be coaxially arranged or non-coaxially arranged.

[0173] Exemplarily, the first adapter and the second adapter are coaxially arranged. The first adapter passes through the second adapter. The first driving member 5 is a first piston cylinder, and the second driving member 7 is a second piston cylinder. The piston rod of the first piston cylinder is coaxial with the first adapter, and the piston rod of the second piston cylinder is located on one side of the piston rod of the first piston cylinder but is connected to the second adapter.

[0174] The second driving member 7 can also be an eccentric cam. The eccentric cam is rotatably connected to a second adapter. The second adapter passes through the sealing cover 3 and one end is connected to the sealing cover 3, and the second adapter can slide along the first direction (i.e., the Figure 1 shown X direction). The rotation of the eccentric cam can drive the sealing cover 3 to move through the second adapter. It should be noted that the eccentric cam can be rotated by a driving device such as a motor, or can be rotated manually by a tester.

[0175] Exemplarily, the first adapter and the second adapter are coaxially arranged, the first adapter is disposed through the second adapter, the first driving member 5 is a first eccentric cam, the second driving member 7 is a second eccentric cam, the first eccentric cam can be assembled to the top end of the first adapter, and the second eccentric cam can be assembled to the outside of the second adapter to ensure that there is no interference when the first eccentric cam and the second eccentric cam rotate.

[0176] The second driving member 7 can drive the sealing cover 3 to move relative to the fixed bracket 6 to create an assembly space for the explosion-proof valve, making the assembly of the explosion-proof valve and the fixed bracket 6 more convenient. At the same time, the first driving member 5 and the second driving member 7 can respectively control the movement of the adsorbing member 4 and the sealing cover 3 to ensure that when the valve cover 102 needs to be opened, the adsorbing member 4 can remain in contact with the valve cover 102.

[0177] In some embodiments, referring to Figures 1 to 4 , a flexible buffer layer 301 is provided at the opening of the sealing cover 3; when the sealing cover 3 covers one end of the target explosion-proof valve 1 provided with the valve cover 102, the flexible buffer layer 301 is used to fit with the target explosion-proof valve 1.

[0178] When the sealing cover 3 is driven by the second driving member 7 to cover the target explosion-proof valve 1, a certain impact may occur between the opening of the sealing cover 3 and the surface of the target explosion-proof valve 1; in this embodiment, by providing the flexible buffer layer 301 at the opening of the sealing cover 3, the flexible buffer layer 301 can be used to play an isolation and buffering role, effectively alleviating the impact and wear caused when the sealing cover 3 contacts the target explosion-proof valve 1. Among them, the flexible buffer layer 301 can be a rubber layer, specifically a ring-shaped rubber structure arranged around the opening of the sealing cover 3.

[0179] In some embodiments, referring to Figures 1 to 4 , the explosion-proof valve tooling further includes an inflation pipeline 8, one end of the inflation pipeline 8 is communicated with the inner cavity of the sealing cover 3, and the other end of the inflation pipeline 8 is used to connect a gas supply device 9.

[0180] During the airtightness test, after the adsorbing member 4 drives the valve cover 102 to open, the gas supply device 9 can supply gas into the inner cavity of the sealing cover 3 through the inflation pipeline 8. Since a closed chamber is formed between the inside of the battery pack 2, the inside of the valve body 101 of the target explosion-proof valve 1 and the inner cavity of the sealing cover 3 at this time, the process of the gas supply device 9 supplying gas into the inner cavity of the sealing cover 3 is equivalent to inflating the inside of the battery pack 2. Based on the above settings, the explosion-proof valve tooling can not only open and close the valve cover 102, but also complete the inflation operation of the battery pack 2 at the same time, thereby further improving the convenience and efficiency of the airtightness test.

[0181] The air supply device 9 may include an air source and an air pump assembly for generating positive pressure, and the air pump assembly may deliver the gas of the air source to the inner cavity of the sealing cover 3 along the inflation pipe 8. The inflation pipe 8 may be a channel opened on the sealing cover 3, or may be a pipe inserted in the sealing cover 3, as long as the inner cavity of the sealing cover 3 is connected to the outside, which is not limited here.

[0182] In some embodiments, reference Figures 1 to 4 The explosion-proof valve tooling also includes a first guide rod 11, which is slidably arranged in the sealing cover 3 along a first direction, one end of the first guide rod 11 is connected to the adsorption member 4, and the other end of the first guide rod 11 is connected to the first driving member 5; the first driving member 5 is used to drive the first guide rod 11 to move along the first direction to drive the adsorption member 4 to move.

[0183] In this embodiment, the first direction (i.e. Figure 1 The X direction shown in the figure refers to the axial direction of the first guide rod 11; the first guide rod 11 is the first adapter mentioned above; the shape of the first guide rod 11 can be a cylinder or a cuboid, and the first guide rod 11 can also be spliced ​​by at least one section of a cylinder and at least one section of a cuboid.

[0184] The first driving member 5 can drive the adsorption member 4 to move via the first guide rod 11 , thus reducing the difficulty of the first driving member 5 driving the adsorption member 4 to move.

[0185] In some embodiments, reference Figures 1 to 4 The explosion-proof valve tooling also includes a first elastic member 12 , which is sleeved on the first guide rod 11 , and the first elastic member 12 is elastically supported between the adsorption member 4 and the sealing cover 3 .

[0186] Specifically, the first elastic member 12 can be set as a spring or a spring sheet, etc. The contact end of the first elastic member 12 and the adsorption member 4 can be connected to the adsorption member 4, or the contact end of the first elastic member 12 and the adsorption member 4 can also be not connected to the adsorption member 4; the contact end of the first elastic member 12 and the sealing cover 3 can be connected to the sealing cover 3, or the contact end of the first elastic member 12 and the sealing cover 3 can also be not connected to the sealing cover 3. It should be noted that, in some embodiments, the first elastic member 12 is always in a compressed state to provide an elastic force.

[0187] The first elastic member 12 can provide an elastic force to the adsorption member 4 to ensure that the adsorption member 4 can be firmly abutted against the valve cover 102 .

[0188] In some embodiments, reference Figures 1 to 4 The explosion-proof valve tooling also includes a second driving member 7 and a second guide rod 13, and the second driving member 7 is transmission-connected to the sealing cover 3; the second driving member 7 is used to drive the sealing cover 3 to move along the first direction, so that the sealing cover 3 covers or moves away from the end of the target explosion-proof valve 1 provided with a valve cover 102;

[0189] The second guide rod 13 is slidably disposed in the fixed bracket 6 along the first direction (i.e., the X direction shown in the figure), one end of the second guide rod 13 is connected to the sealing cover 3, and the other end of the second guide rod 13 is connected to the second driving member 7; the second driving member 7 is used to drive the second guide rod 13 to move along the first direction to drive the sealing cover 3 to move. Figure 1 Specifically, the second guide rod 13 is the second adapter described above. The shape of the second guide rod 13 can be a cylinder or a cuboid, and the second guide rod 13 can also be formed by splicing at least one section of a cylinder and at least one section of a cuboid.

[0190] Specifically, the second guide rod 13 is the second adapter described above. The shape of the second guide rod 13 can be a cylinder or a cuboid, and the second guide rod 13 can also be formed by splicing at least one section of a cylinder and at least one section of a cuboid.

[0191] The second guide rod 13 can be a solid guide rod, or a through hole can be machined along its axis. Exemplarily, if a through hole is machined along the axis of the second guide rod 13, the first guide rod 11 can be disposed in the second guide rod 13 through the through hole.

[0192] Exemplarily, referring to Figures 2 to 4 , a third through hole (not shown in the figure) can be machined on the fixed bracket 6, and the second guide rod 13 is disposed in the third through hole and is slidably connected to the third through hole.

[0193] The second driving member 7 can drive the sealing cover 3 to move through the second guide rod 13, thereby reducing the difficulty of realizing the movement of the sealing cover 3 by the second driving member 7.

[0194] In some embodiments, referring to Figures 1 to 4 , the explosion-proof valve tooling further includes a second elastic member 14, the second elastic member 14 is sleeved on the second guide rod 13, and the second elastic member 14 is elastically supported between the sealing cover 3 and the fixed bracket 6.

[0195] Specifically, the second elastic member 14 can be set as a spring or a spring sheet, etc. The contact end of the second elastic member 14 with the sealing cover 3 can be connected to the sealing cover 3, and the contact end of the second elastic member 14 with the sealing cover 3 can also not be connected to the sealing cover 3; the contact end of the second elastic member 14 with the fixed bracket 6 can be connected to the fixed bracket 6, and the contact end of the second elastic member 14 with the fixed bracket 6 can also not be connected to the fixed bracket 6. It should be noted that in some embodiments, the second elastic member 14 is always in a compressed state to provide an elastic force.

[0196] The second elastic member 14 can provide an elastic force to the sealing cover 3 to make the sealing cover 3 firmly fit against one end of the fixed bracket 6.

[0197] In some embodiments, referring to Figures 1 to 4 , the second driving member 7 includes a second cam portion 701 and a second holding portion 702, and the second cam portion 701 rotates around the second axis (i.e., Figure 1The axis b) shown is rotatably connected to the second guide rod 13 , the second cam portion 701 abuts against the fixed bracket 6 , and the second axis is perpendicular to the first direction; the second gripping portion 702 is connected to the second cam portion 701 .

[0198] The second cam portion 701 can be configured as one plate or two plates. Exemplarily, when the second cam portion 701 is configured as two plates, the two plates are symmetrically arranged relative to the central axis of the second guide rod 13 .

[0199] The second gripping portion 702 may be integrally formed with the second cam portion 701 , and the second gripping portion 702 may also be connected to the second cam portion 701 via a fastener or by welding.

[0200] Reference Figures 1 to 4 The second cam portion 701 is provided with a first limiting surface (not shown in the figure) in the circumferential direction. When the second driving member 7 is in the initial position, the first limiting surface abuts against the fixed bracket 6. When the second cam portion 701 is in the initial position, the first limiting surface abuts against the fixed bracket 6 and limits the position, the bottom surface of the sealing cover 3 abuts against the fixed bracket 6, and the explosion-proof valve cannot be assembled with the fixed bracket 6. The second cam portion 701 drives the sealing cover 3 relative to the fixed bracket 6 along the first direction (i.e. Figure 1 The sealing cover 3 moves in the X direction as shown, and an assembly space for the explosion-proof valve to enter the fixed bracket 6 is formed between the bottom of the sealing cover 3 and the fixed bracket 6; at this time, the tester can install the explosion-proof valve into the fixed bracket 6, and then control the second cam portion 701 to return to the initial position; after the second cam portion 701 is reset, the sealing cover 3 will form a closed chamber with the valve body 101.

[0201] In this embodiment, the tester can drive the sealing cover 3 to move by manually rotating the second cam portion 701, which can reduce the operating difficulty of the tester.

[0202] In some embodiments, reference Figures 1 to 4 The explosion-proof valve tooling also includes a first guide rod 11, which is slidably arranged in the sealing cover 3 along a first direction, one end of the first guide rod 11 is connected to the adsorption member 4, and the other end of the first guide rod 11 is connected to the first driving member 5; the first driving member 5 is used to drive the first guide rod 11 to move along the first direction to drive the adsorption member 4 to move; the second guide rod 13 is a hollow structure, and the first guide rod 11 is slidably connected to the inner cavity of the second guide rod 13 along the first direction.

[0203] Specifically, the hollow structure means that the second guide rod 13 has a through hole along its axis, and the first guide rod 11 can slide in the through hole. For example, the through hole is a square hole, and the shape of the first guide rod 11 is a rectangular parallelepiped that matches the square hole. The first guide rod 11 can only move in the first direction (i.e. Figure 1The machine can slide in the X direction (as shown) but cannot rotate in the circumferential direction.

[0204] The second guide rod 13 can be used as an assembly base for the first guide rod 11, so that the overall structure of the explosion-proof valve tooling is more compact and occupies less space.

[0205] In some embodiments, reference Figures 1 to 4 The first driving member 5 includes a first cam portion 501 and a first gripping portion 502. The first cam portion 501 rotates around a first axis (i.e. Figure 1 The axis a) shown is rotatably connected to the end of the first guide rod 11 away from the adsorption member 4 , the first cam portion 501 abuts against the second guide rod 13 , and the first axis is perpendicular to the first direction; the first gripping portion 502 is connected to the first cam portion 501 .

[0206] Reference Figure 2 , when the first cam portion 501 is located at the initial position, the second limiting surface 5011 abuts against and limits the second guide rod 13, and there is a first distance between the adsorption member 4 and the valve cover 102; Figure 3 , when the first cam portion 501 is located at the middle position, the third limiting surface 5012 abuts against and limits the second guide rod 13, and the adsorption member 4 contacts the valve cover 102; refer to Figure 4 When the first cam portion 501 is in the working position, the fourth limiting surface 5013 abuts against and limits the second guide rod 13, and the adsorption component 4 pulls the valve cover 102 to the designed height, and the valve cover 102 and the valve body 101 are separated to form an inflation opening. At this time, the distance between the adsorption component 4 and the valve body 101 is the second distance; it should be noted that the first distance needs to be greater than the second distance.

[0207] The first cam portion 501 may be configured as one plate or two plates. Exemplarily, when the first cam portion 501 is configured as two plates, the two plates are symmetrically arranged relative to the central axis of the first guide rod 11 .

[0208] The first gripping portion 502 may be integrally formed with the first cam portion 501 , and the first gripping portion 502 may also be connected to the first cam portion 501 via a fastener or by welding.

[0209] In this embodiment, the tester can drive the adsorption component 4 to move by manually rotating the first cam portion 501 , thereby reducing the operating difficulty of the tester.

[0210] In some embodiments, reference Figures 1 to 4, the suction member 4 is provided with a suction cavity 401, the first guide rod 11 is provided with a suction channel 1101, and the second guide rod 13 is provided with a connection channel 1301; the suction cavity 401 is used to face the valve cover 102, one end of the suction channel 1101 communicates with the suction cavity 401, the other end of the suction channel 1101 communicates with one end of the connection channel 1301, and the other end of the connection channel 1301 is used to connect to the negative pressure device 10.

[0211] The suction channel 1101 may include a first channel section and a second channel section. The first channel section may extend along the axial direction of the first guide rod 11 so that the first guide rod 11 forms a hollow structure. The lower end of the first channel section communicates with the suction cavity 401. The second channel section is provided on the cylindrical surface of the first guide rod 11 and communicates with the upper end of the first channel section. The second channel section may be provided in multiple numbers and arranged in a circumferential array along the first guide rod 11; the connection channel 1301 may be provided on the cylindrical surface of the second guide rod 13 and communicate with the inner cavity of the hollow second guide rod 13, and the height position where the connection channel 1301 is located is opposite to that of the second channel section, so that the connection between the connection channel 1301 and the suction channel 1101 can be realized. Based on the above settings, the negative pressure device 10 can be connected to the suction cavity 401 through the connection channel 1301 and the suction channel 1101; when the surface where the suction cavity 401 is located fits with the valve cover 102, the negative pressure device 10 sucks the gas in the suction cavity 401 to the outside through the suction channel 1101 and the connection channel 1301, so that a negative pressure environment is formed in the suction cavity 401, so that the suction member 4 can be adsorbed to the valve cover 102 and pull the valve cover 102 to open. Among them, the negative pressure device 10 may include a gas pump assembly with a suction function, etc.

[0212] By providing the attachment channel and the connection channel 1301, the connection between the external negative pressure device 10 and the internal suction member 4 can be realized without affecting the basic structure and connection and cooperation relationship of the first guide rod 11 and the second guide rod 13, so that the negative pressure suction action of the suction member 4 can be carried out normally.

[0213] In some embodiments, referring to Figures 1 to 4 , the explosion-proof valve tooling further includes a fixed bracket 6. The fixed bracket 6 is used for fixedly connecting with the valve body 101 of the target explosion-proof valve 1, and the sealing cover 3 is movably connected to the fixed bracket 6; both the first driving member 5 and the second driving member 7 are arranged outside the fixed bracket 6.

[0214] Based on the above design, the assembly of the first driving member 5 and the second driving member 7 can be made more convenient.

[0215] In some embodiments, referring to Figures 1 to 4, the fixing bracket 6 includes a top wall 601 and a side wall 602. The side wall 602 surrounds the periphery of the top wall 601 to form a receiving cavity 603. The sealing cover 3 is disposed in the receiving cavity 603, and the receiving cavity 603 is used to receive at least a part of the target explosion-proof valve 1.

[0216] Exemplarily, the valve body 101 of the target explosion-proof valve 1 can enter the receiving cavity 603 through the bottom of the side wall 602. The side wall 602 can be arranged as an annular structure, and the valve cover 102 can be clamped with the fixing bracket 6 through an elastic snap structure arranged on the inner side of the side wall 602; alternatively, as Figure 1 shown, an avoidance opening 6021 is provided on the side surface of the side wall 602, so that the valve body 101 of the target explosion-proof valve 1 can enter the receiving cavity 603 from the side surface of the side wall 602 through the avoidance opening 6021.

[0217] In some embodiments, referring to Figures 1 to 4 , a limiting flange 6022 protrudes at the opening of the end of the side wall 602 away from the top wall 601. The limiting flange 6022 is used for clamping and cooperating with the limiting groove 1011 of the target explosion-proof valve 1.

[0218] Through the cooperation between the limiting flange 6022 and the limiting groove 1011, the explosion-proof valve can be stably clamped and assembled into the fixing bracket 6, improving the connection tightness between the explosion-proof valve and the fixing bracket 6.

[0219] In some embodiments, referring to Figures 1 to 4 , the explosion-proof valve tooling further includes an inflation pipeline 8. The inflation pipeline 8 is slidably disposed through the top wall 601 along a first direction. One end of the inflation pipeline 8 communicates with the inner cavity of the sealing cover 3, and the other end of the inflation pipeline 8 is used to connect to a gas supply device 9.

[0220] Specifically, since the sealing cover 3 moves relative to the fixing bracket 6 along the first direction (i.e., the Figure 1 shown X direction), when the inflation pipeline 8 is also slidably disposed through the top wall 601 along the first direction, while ensuring that the gas supply device 9 can transport external gas to the inner cavity of the sealing cover 3 through the inflation pipeline 8, it can avoid the inflation pipeline 8 from hindering the relative movement between the sealing cover 3 and the fixing bracket 6.

[0221] The embodiment of the present application further provides an explosion-proof valve detection system. Please refer to Figures 5 to 7 , the explosion-proof valve detection system includes a target explosion-proof valve 1, a negative pressure device 10, and the explosion-proof valve tooling in any of the above embodiments;

[0222] The sealing cover 3 covers one end of the target explosion-proof valve 1 where the valve cover 102 is provided. The negative pressure device 10 is connected to the suction attachment 4; the negative pressure device 10 is used to perform a suction operation on the suction attachment 4 so that the suction attachment 4 adsorbs the valve cover 102 under the action of negative pressure.

[0223] In this embodiment, the target explosion-proof valve 1 is disposed on the battery pack 2 to be tested, and the inner cavity of the valve body 101 of the target explosion-proof valve 1 communicates with the inside of the battery pack 2; when the valve cover 102 of the target explosion-proof valve 1 is not opened, the inner cavity of the valve body 101 and the inside of the battery pack 2 form a closed chamber; when the valve cover 102 is opened, the inside of the battery pack 2 can communicate with the outside through the valve body 101.

[0224] The negative pressure device 10 may include an air pump assembly with a suction function, etc.

[0225] During the airtightness test of the battery pack 2, after the sealing cover 3 is covered on the end of the target explosion-proof valve 1 where the valve cover 102 is provided, the first driving member 5 can be used to drive the adsorbing member 4 to contact the valve cover 102, and then the negative pressure device 10 can perform a suction operation on the adsorbing member 4, so that the adsorbing member 4 is attracted to the valve cover 102 under the negative pressure. Then, the first driving member 5 drives the adsorbing member 4 to move away from the target explosion-proof valve 1 to drive the valve cover 102 adsorbed on the adsorbing member 4 to open, and then air can be filled into the inside of the valve body 101 of the target explosion-proof valve 1 for subsequent airtightness test; if it is necessary to close the valve cover 102, only the negative pressure suction operation on the adsorbing member 4 needs to be stopped, so that the valve cover 102 is separated from the adsorbing member 4 and re-covered on the valve body 101 under the action of the spring.

[0226] It should be noted that the sealing cover 3 is hermetically connected to the target explosion-proof valve 1. Therefore, when the valve cover 102 is opened, a closed chamber can be formed among the inside of the battery pack 2, the inside of the valve body 101 of the target explosion-proof valve 1, and the inner cavity of the sealing cover 3. The airtightness test can be carried out in the state where the valve cover 102 is opened after inflation. At this time, the sealing performance of the battery pack 2 is detected; it is also possible to stop the negative pressure suction operation on the adsorbing member 4 after inflation, so that the valve cover 102 is separated from the adsorbing member 4 and re-covered on the valve body 101, so that a closed chamber is formed between the inside of the battery pack 2 and the inside of the valve body 101 of the target explosion-proof valve 1, and a closed chamber is also formed in the inner cavity of the sealing cover 3, and then the airtightness test is carried out. At this time, the sealing performance of the target explosion-proof valve 1 itself is detected; of course, in actual applications, the above two methods can also be used simultaneously for the airtightness test to obtain more comprehensive test results, which is not limited here.

[0227] Based on the above settings, when there is no iron sheet inside the valve cover 102 and the valve cover 102 is made of a non-metallic material, the opening and closing of the valve cover 102 can be conveniently realized by negative pressure adsorption, so that the airtightness test can be carried out smoothly and efficiently.

[0228] Since the explosion-proof valve detection system in this embodiment adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated here one by one.

[0229] In some embodiments, referring to Figures 5 to 7 , the explosion-proof valve detection system further includes a gas supply device 9, and the gas supply device 9 is connected to the sealing cover 3. The gas supply device 9 is used to inflate the inner cavity of the sealing cover 3.

[0230] Specifically, the gas supply device 9 can be connected to the inner cavity of the sealing cover 3 through an inflation pipeline 8. During the airtightness test, after the suction attachment 4 drives the valve cover 102 to open, the gas supply device 9 can supply gas into the inner cavity of the sealing cover 3 through the inflation pipeline 8. And since a closed chamber is formed between the inside of the battery pack 2, the inside of the valve body 101 of the target explosion-proof valve 1 and the inner cavity of the sealing cover 3 at this time, the process of the gas supply device 9 supplying gas into the inner cavity of the sealing cover 3 is equivalent to inflating the inside of the battery pack 2. Based on the above settings, the explosion-proof valve tooling can not only open and close the valve cover 102, but also complete the inflation operation of the battery pack 2 together, thereby further improving the convenience and efficiency of the airtightness test.

[0231] Among them, the gas supply device 9 can include a gas source and an air pump assembly for generating positive pressure. The air pump assembly can transport the gas of the gas source to the inner cavity of the sealing cover 3 along the inflation pipeline 8. The inflation pipeline 8 can be a channel opened on the sealing cover 3 or a pipe fitting passing through the sealing cover 3, as long as the inner cavity of the sealing cover 3 is connected to the outside, which is not limited here.

[0232] In some embodiments, referring to Figures 5 to 7 , a negative pressure device 10 is connected to the sealing cover 3. The negative pressure device 10 is used to extract the gas in the inner cavity of the sealing cover 3 to the outside.

[0233] Specifically, the negative pressure device 10 can be connected to the inner cavity of the sealing cover 3 through a negative pressure pipeline. When the pressure in the inner cavity of the sealing cover 3 is too high, a part of the gas in the inner cavity of the sealing cover 3 can be pumped out through the negative pressure device 10; and when it is necessary to evacuate the gas in the inner cavity of the sealing cover 3 due to the requirements of airtightness testing, all the gas in the inner cavity of the sealing cover 3 can be pumped out through the negative pressure device 10 to create a vacuum environment inside the sealing cover 3. Exemplarily, based on the airtightness testing process in the above embodiment, after the gas supply device 9 finishes inflating the battery pack 2 and completes the detection of the sealing performance of the battery pack 2, the valve cover 102 is re-covered on the valve body 101, so that the inside of the battery pack 2 and the inside of the valve body 101 of the target explosion-proof valve 1 form a first closed chamber, and the inner cavity of the sealing cover 3 forms a second closed chamber, and the first closed chamber and the second closed chamber are not connected to each other; at this time, the negative pressure device 10 can pump out all the gas in the second closed chamber to create a vacuum environment. If it is detected later that the air pressure in the second closed chamber increases, it may be that the gas in the first closed chamber leaks into the second closed chamber through the abnormally sealed position of the valve cover 102. In this way, the airtightness detection of the target explosion-proof valve 1 itself can be realized.

[0234] Through the cooperation between the negative pressure device 10 and the gas supply device 9, the gas supply operation and the exhaust operation of the sealing cover 3 can be realized, so that the air pressure conditions in the inner cavity of the sealing cover 3 can better meet the actual test requirements.

[0235] It should be noted that the negative pressure device 10 and the gas supply device 9 can be connected to the inner cavity of the sealing cover 3 through the same ventilation pipeline. For example, they can be connected to the inner cavity of the sealing cover 3 through the inflation pipeline 8 in the above embodiment, and it is only necessary to ensure that the negative pressure device 10 and the gas supply device 9 do not work at the same time, so as to avoid over-complicating the structure of the explosion-proof valve detection system.

[0236] In some embodiments, referring to Figures 5 to 7 , the gas supply device 9 is connected to the suction attachment 4; the gas supply device 9 is used to inflate the suction attachment 4 so that the suction attachment 4 is separated from the valve cover 102 under positive pressure.

[0237] Based on the airtightness testing process in the above embodiment, after the gas supply device 9 finishes inflating the battery pack 2 and completes the detection of the sealing performance of the battery pack 2, the negative pressure device 10 stops the negative pressure suction operation on the suction attachment 4. At this time, the gas supply device 9 can be used to inflate the suction attachment 4 again to ensure that the valve cover 102 can be smoothly separated from the suction attachment 4 under positive pressure and push the valve cover 102 to re-cover on the valve body 101.

[0238] It should be noted that the air supply device 9 and the negative pressure device 10 can be connected to the adsorbing member 4 through the same ventilation pipeline. For example, they can be connected to the adsorption cavity 401 of the adsorbing member 4 through the connection channel 1301 of the second guide rod 13 and the adsorption channel 1101 of the first guide rod 11 in the above-mentioned embodiment, and it is only necessary to ensure that the air supply device 9 and the negative pressure device 10 do not work simultaneously, so as to avoid over-complicating the structure of the explosion-proof valve detection system.

[0239] In some embodiments, referring to Figures 5 to 7 , the explosion-proof valve detection system further includes a second pressure sensor 16, and the second pressure sensor 16 is used to obtain the third pressure value in the connection path between the negative pressure device 10 and the adsorbing member 4.

[0240] By setting the second pressure sensor 16 to obtain the third pressure value in the connection path between the negative pressure device 10 and the adsorbing member 4, it is possible to judge whether the adsorbing member 4 has been firmly attached to the valve cover 102 and whether the adsorbing member 4 can successfully drive the valve cover 102 to open according to the magnitude and change of the third pressure value during the negative pressure suction operation of the adsorbing member 4 by the negative pressure device 10.

[0241] In addition, after the valve cover 102 is separated from the adsorbing member 4 and re-covered on the valve body 101, the adsorption end of the adsorbing member 4 (specifically, the adsorption cavity 401) is communicated with the inner cavity of the sealing cover 3. At this time, the negative pressure device 10 can be used to perform a negative pressure suction operation on the adsorbing member 4 to evacuate the gas in the inner cavity of the sealing cover 3; and during this process, it is possible to judge whether there is a leakage according to the magnitude and change of the third pressure value, so as to stop the negative pressure suction operation after ensuring that the gas in the sealing cover 3 has been completely evacuated.

[0242] Based on the above settings, it can help the tester more intuitively and accurately control the corresponding test links, and can intervene in time when the third pressure value does not conform to the preset situation, so as to timely and accurately eliminate abnormalities and faults, and avoid affecting the subsequent test process.

[0243] In some embodiments, referring to Figures 5 to 7 , the explosion-proof valve detection system further includes a first pressure sensor 15, and the first pressure sensor 15 is used to obtain the first pressure value in the connection path between the air supply device 9 and the sealing cover 3.

[0244] By setting the first pressure sensor 15 to obtain the first pressure value in the connection path between the air supply device 9 and the sealing cover 3, it is possible to judge whether there is air leakage in the sealing cover 3, the target explosion-proof valve 1, and the battery pack 2 according to the magnitude and change of the first pressure value during the process of inflating the inner cavity of the sealing cover 3 through the air supply device 9, and stop the inflation operation after ensuring that the gas volume in the corresponding chamber reaches the preset value, so as to help the tester more intuitively and accurately control the corresponding test link and improve the accuracy of the test results.

[0245] In some embodiments, referring to Figures 5 to 7 , the explosion-proof valve detection system further includes a first pressure sensor 15, and the first pressure sensor 15 is used to obtain the second pressure value in the connection path between the negative pressure device 10 and the sealing cover 3.

[0246] By setting the first pressure sensor 15 to obtain the second pressure value in the connection path between the negative pressure device 10 and the sealing cover 3, it is possible to judge whether there is air leakage according to the magnitude and change of the second pressure value during the process of performing a negative pressure suction operation on the inner cavity of the sealing cover 3 through the negative pressure device 10 to evacuate the gas in the sealing cover 3, so as to stop the negative pressure suction operation after ensuring that the gas in the sealing cover 3 has been completely evacuated, thereby helping the tester more intuitively and accurately control the corresponding test link and improving the accuracy of the test results.

[0247] In some embodiments, referring to Figures 5 to 7 , the explosion-proof valve detection system further includes a second pressure sensor 16, and the second pressure sensor 16 is used to obtain the fourth pressure value in the connection path between the air supply device 9 and the suction accessory 4.

[0248] By setting the second pressure sensor 16 to obtain the fourth pressure value in the connection path between the air supply device 9 and the suction accessory 4, it is possible to judge whether the valve cover 102 has been successfully separated from the suction accessory 4 according to the magnitude and change of the fourth pressure value during the process of inflating the suction accessory 4 through the air supply device 9 to ensure the separation of the valve cover 102 from the suction accessory 4, thereby helping the tester more intuitively and accurately control the corresponding test link and ensuring the normal progress of the test process.

[0249] In some embodiments, referring to Figures 5 to 7 , the explosion-proof valve detection system further includes a pressure tester 17, and the pressure tester 17 is used to obtain the pressure change amount in the inner cavity of the sealing cover 3 within a preset time.

[0250] Based on the airtightness test process in the above embodiments, after the air supply device 9 finishes inflating the battery pack 2, since the interior of the battery pack 2, the interior of the valve body 101 of the target explosion-proof valve 1, and the inner cavity of the sealing cover 3 together form a closed chamber, in the case of normal sealing, the air pressure in this closed chamber should not change significantly within a certain period of time. Based on this consideration, after the battery pack 2 is inflated, the change amount of the pressure in the inner cavity of the sealing cover 3 detected by the pressure tester 17 within a certain period of time (i.e., the change amount of the pressure in the above-mentioned closed chamber) can be used to determine whether there is air leakage or abnormal sealing, so as to realize the detection of the sealing performance of the battery pack 2.

[0251] Similarly, when the valve cover 102 is re-covered on the valve body 101 and the negative pressure device 10 completely evacuates the gas in the inner cavity of the sealing cover 3, since the interior of the battery pack 2 and the interior of the valve body 101 of the target explosion-proof valve 1 form a first closed chamber, the inner cavity of the sealing cover 3 forms a second closed chamber, and the first closed chamber and the second closed chamber are not connected to each other. Therefore, in the case of normal sealing (i.e., the sealing between the valve cover 102 and the valve body 101 is normal), the air pressure in the second closed chamber should not change significantly within a certain period of time. Based on this consideration, after evacuating the gas in the inner cavity of the sealing cover 3, the change amount of the pressure in the inner cavity of the sealing cover 3 detected by the pressure tester 17 within a certain period of time (i.e., the change amount of the pressure in the above-mentioned second closed chamber) can be used to determine whether the sealing between the first closed chamber and the second closed chamber is normal and whether the gas in the first closed chamber leaks into the second closed chamber, etc., so as to realize the detection of the sealing performance of the target explosion-proof valve 1 itself.

[0252] The embodiment of the present application also provides an operation method for the explosion-proof valve detection process. Please refer to Figure 5 and Figure 6 , and the operation method for the explosion-proof valve detection process includes the following steps:

[0253] Drive the suction attachment 4 to fit with the valve cover 102 of the target explosion-proof valve 1 so that at least part of the suction attachment 4 forms a first cavity with the valve cover 102;

[0254] Perform a suction operation on the first cavity;

[0255] Drive the suction attachment 4 to move to drive the valve cover 102 to open and expose the ventilation port covered by the valve cover 102.

[0256] Specifically, when the adsorption end of the adsorbing member 4 is in close contact with the valve cover 102, a closed first cavity will be formed between the adsorption end and the valve cover 102. The suction operation of the negative pressure device 10 can evacuate the gas in the first cavity within a certain period of time, reducing the air pressure in the first cavity to zero or close to zero. Then, the valve cover 102 can be driven to open by driving the adsorbing member 4, exposing the vent on the target explosion-proof valve 1, so that the inside of the valve body 101 of the target explosion-proof valve 1 can be inflated through the vent for airtightness detection later.

[0257] Based on the above settings, when there is no iron sheet inside the valve cover 102 and the valve cover is made of non-metallic material, the valve cover 102 can be conveniently opened by the negative pressure adsorption of the adsorbing member 4, providing convenience for subsequent inflation operations and airtightness detection processes.

[0258] It should be noted that a third valve 20 can be provided on the connection path between the negative pressure device 10 and the adsorbing member 4. By opening the third valve 20, the negative pressure device 10 can start the suction operation on the adsorbing member 4.

[0259] In some embodiments, referring to Figure 5 and Figure 6 , after the step of performing the suction operation on the first cavity, the operation method of the explosion-proof valve detection process further includes the following steps:

[0260] After a preset time for the suction operation is completed, obtain the third pressure value in the first cavity;

[0261] The step of driving the adsorbing member 4 to move includes:

[0262] When the third pressure value is not greater than the first pressure threshold, drive the adsorbing member 4 to move;

[0263] When the third pressure value is greater than the first pressure threshold, output a first abnormal prompt message.

[0264] When the adsorption end of the adsorbing member 4 fails to be in normal contact with the valve cover 102 due to abnormal assembly or other reasons, the suction operation of the negative pressure device 10 may not be able to completely evacuate the gas in the first cavity within the preset time, resulting in a relatively high air pressure in the first cavity. Considering the above, by judging whether the third pressure value is greater than the first pressure threshold after the preset time for the suction operation is completed, it can be determined whether an abnormal situation occurs. If there is no abnormal situation, it is determined that the adsorbing member 4 has been tightly adsorbed to the valve cover 102. At this time, the adsorbing member 4 can be driven to open the valve cover 102 and perform subsequent test processes; if an abnormal situation occurs, the first abnormal prompt message can be output to remind the tester to check and adjust the assembly situation in time.

[0265] In some embodiments, referring to Figure 5 and Figure 6, after the step of driving the suction attachment 4 to move to drive the valve cover 102 to open and expose the vent port sealed by the valve cover 102, the operation method of the explosion-proof valve detection process further includes the following steps:

[0266] When the third pressure value increases to the second pressure threshold, output a second abnormal prompt message; the second pressure threshold is greater than the first pressure threshold.

[0267] Specifically, during the process of the suction attachment 4 driving the valve cover 102 to open, if the suction end of the suction attachment 4 and the valve cover 102 still maintain a tightly fitting state, the air pressure in the first cavity should not change significantly, and the air pressure should be maintained at zero or close to zero. Based on the above considerations, during the process of driving the suction attachment 4 to move, it can be determined whether the valve cover 102 is in contact with the suction attachment 4 by judging whether the third pressure value increases to the second pressure threshold, so as to determine whether the suction attachment 4 successfully drives the valve cover 102 to open; when the suction attachment 4 does not drive the valve cover 102 to open normally, the tester is reminded to intervene and handle in time by outputting a second abnormal prompt message, so as not to affect the subsequent test process.

[0268] In some embodiments, referring to Figure 5 and Figure 6 , after the step of driving the suction attachment 4 to move to drive the valve cover 102 to open and expose the vent port sealed by the valve cover 102, the operation method of the explosion-proof valve detection process further includes the following steps:

[0269] Inflate the inside of the target explosion-proof valve 1 through the vent port.

[0270] In practical applications, the inside of the target explosion-proof valve 1 can be inflated by directly supplying air to the vent port, or by supplying air to other cavities connected to the vent port. There is no limitation here.

[0271] Inflating the inside of the target explosion-proof valve 1 through the vent port can provide a basis for the subsequent airtightness detection process.

[0272] In some embodiments, referring to Figure 5 and Figure 6 , before the step of driving the suction attachment 4 to fit with the valve cover 102 of the target explosion-proof valve 1, the operation method of the explosion-proof valve detection process further includes the following steps:

[0273] Form a second cavity by covering one end of the target explosion-proof valve 1 provided with the valve cover 102 with the sealing cover 3; the suction attachment 4 is arranged in the second cavity;

[0274] The step of inflating the inside of the target explosion-proof valve 1 through the vent port includes:

[0275] Inflate the second cavity so that the inflated gas enters the interior of the target explosion-proof valve 1 through the vent port.

[0276] In this embodiment, after the suction attachment 4 drives the valve cover 102 to open, a closed second cavity is formed among the interior of the battery pack 2, the interior of the target explosion-proof valve 1, and the inner cavity of the sealing cover 3. Therefore, the process of supplying gas to the second cavity is equivalent to inflating the interior of the battery pack 2; and after the inflation is completed, the subsequent airtightness test process can be carried out. Based on the above settings, it is only necessary to integrate the gas supply device 9 on the sealing cover 3, rather than connecting the gas supply device 9 at the vent port after the valve cover 102 is opened, thereby further improving the convenience and efficiency of the airtightness test.

[0277] It should be noted that a first valve 18 can be provided on the connection path between the gas supply device 9 and the sealing cover 3. By opening the first valve 18, the gas supply device 9 can start the inflation operation of the second cavity.

[0278] In some embodiments, referring to Figure 5 and Figure 6 , the step of inflating the second cavity so that the inflated gas enters the interior of the target explosion-proof valve 1 includes:

[0279] Obtain the first pressure value of the second cavity;

[0280] When the first pressure value reaches the third pressure threshold, stop inflating the second cavity.

[0281] During the inflation process of the above embodiment, as the gas is continuously inflated, the air pressure in the second cavity will continuously increase; by judging whether the first pressure value of the second cavity reaches the third pressure threshold, it can be accurately determined whether the inflation operation is completed; when it is confirmed that the inflation amount has reached the preset level, the inflation operation is stopped.

[0282] It should be noted that a first valve 18 can be provided on the connection path between the gas supply device 9 and the sealing cover 3. By closing the first valve 18, the gas supply device 9 can stop the inflation operation of the inner cavity of the sealing cover 3 (that is, stop the inflation operation of the second cavity).

[0283] In some embodiments, referring to Figure 5 and Figure 6 , after the step of inflating the second cavity so that the inflated gas enters the interior of the target explosion-proof valve 1, the operation method of the explosion-proof valve detection process further includes the following steps:

[0284] Obtain the first pressure change amount of the second cavity within a preset time;

[0285] When the first pressure change amount reaches the first change amount threshold, output the third abnormal prompt information.

[0286] After inflation, under normal sealing conditions, the air pressure in the closed second cavity jointly formed by the interior of the battery pack 2, the interior of the target explosion-proof valve 1, and the inner cavity of the sealing cover 3 should not change significantly within a certain period of time. Based on this consideration, in this embodiment, by detecting the first pressure change amount of the second cavity within a preset time and making a judgment, if the first pressure change amount reaches the first change amount threshold, it indicates that the air pressure in the second cavity has changed significantly, and thus it can be determined that the battery pack 2 may have an abnormal seal condition resulting in gas leakage. Therefore, the tester can be timely reminded to intervene and handle by outputting the third abnormal prompt information.

[0287] Among them, the detection of the first pressure change amount of the second cavity within a preset time can be achieved by detecting the pressure change amount in the inner cavity of the sealing cover 3 by the pressure tester 17 within a preset time.

[0288] Based on the above settings, accurate detection of the sealing performance of the battery pack 2 can be realized.

[0289] In some embodiments, referring to Figure 5 and Figure 6 , before the step of obtaining the first pressure change amount of the second cavity within a preset time, the operation method of the explosion-proof valve detection process further includes the following steps:

[0290] Let the target explosion-proof valve 1 stand still for a preset time.

[0291] Since gas is fluid, within a period of time after inflation, the air flow in the second cavity is still in an unstable state, and there may be deviations in air pressure detection at this time, which may lead to misjudgment. Based on this situation, in this embodiment, after inflation, the target explosion-proof valve 1 is left standing for a preset time to make the air flow in the second cavity tend to be stable and the air pressure tend to be balanced, and then the first pressure change amount is obtained. In this way, the accuracy of the final airtightness detection result can be further improved.

[0292] In some embodiments, referring to Figure 7 , after the step of inflating the interior of the target explosion-proof valve 1 through the air vent, the operation method of the explosion-proof valve detection process further includes the following steps:

[0293] Stop the suction operation on the suction accessory 4, so that the valve cover 102 is separated from the suction accessory 4 and re-capped on the air vent.

[0294] After the above inflation operation and airtightness detection operation are completed, the valve cover 102 needs to be closed; at this time, stopping the suction operation on the suction accessory 4 can make the valve cover 102 lose the negative pressure effect, so that the valve cover 102 can be re-covered on the target explosion-proof valve 1 under the action of gravity or the acting force of other connecting devices (such as the elastic acting force of a spring), thereby realizing the automatic closing of the valve cover 102.

[0295] It is understandable that the closing operation of the valve cover 102 in this embodiment can be carried out after the airtightness detection operation of the battery pack 2 in the above embodiment; it can also be carried out directly after the inflation of the battery pack 2 is completed, and the airtightness detection operation of the battery pack 2 can be arranged in subsequent steps; during the test, it can be flexibly adjusted according to the actual situation, and no limitation is made here.

[0296] In some embodiments, referring to Figure 7 , the step of stopping the suction operation on the suction attachment 4, separating the valve cover 102 from the suction attachment 4 and re - covering it on the vent includes:

[0297] Inflate the suction attachment 4, so that the valve cover 102 is separated from the suction attachment 4 under the action of positive pressure and re - covers on the vent;

[0298] Stop inflating the suction attachment 4.

[0299] While stopping the negative - pressure suction operation on the suction attachment 4, inflate the suction attachment 4. In this way, it can be ensured that the valve cover 102 can be smoothly separated from the suction attachment 4 under the action of positive pressure, and the valve cover 102 can be re - covered on the target explosion - proof valve 1 under the action of positive pressure.

[0300] Specifically, the negative - pressure suction operation on the suction attachment 4 can be carried out through the negative - pressure device 10. During the closing process of the valve cover 102, it can be judged whether the valve cover 102 is normally separated from the suction attachment 4 according to the third pressure value in the connection path between the negative - pressure device 10 and the suction attachment 4 obtained by the second pressure sensor 16, and stop inflating the suction attachment 4 after it is determined that the valve cover 102 is separated from the suction attachment 4.

[0301] Specifically, the inflation operation on the suction attachment 4 can be carried out through the air - supply device 9. A fourth valve 21 can be arranged on the connection path between the air - supply device 9 and the suction attachment 4. By closing the fourth valve 21, the air - supply device 9 can be stopped from inflating the suction attachment 4.

[0302] In some embodiments, referring to Figures 5 to 7 , before the step of driving the suction attachment 4 to fit with the valve cover 102 of the target explosion - proof valve 1, the operation method of the explosion - proof valve detection process further includes the following steps:

[0303] Cover the end of the target explosion - proof valve 1 where the valve cover 102 is provided with a sealing cover 3 to form a second cavity; the suction attachment 4 is arranged in the second cavity;

[0304] After the step of stopping the suction operation on the suction attachment 4, separating the valve cover 102 from the suction attachment 4 and re - covering it on the vent, the operation method of the explosion - proof valve detection process further includes the following steps:

[0305] Discharge the gas in the second cavity to the outside.

[0306] In this embodiment, after the valve cover 102 is closed again, the interior of the battery pack 2 and the interior of the target explosion-proof valve 1 form a first closed chamber, and the inner cavity of the sealing cover 3 forms a second cavity. When the sealing is normal (specifically, when the sealing between the valve cover 102 and the valve body 101 is normal), the first closed chamber and the second cavity are not connected to each other; at this time, the gas in the inner cavity of the sealing cover 3 can be emptied (that is, discharge the gas in the second cavity to the outside), so that a pressure difference can be formed between the first closed chamber and the second cavity. Subsequently, by obtaining the pressure change of the first closed chamber and / or the second cavity, it can be used to determine whether there is gas exchange between the first closed chamber and the second cavity, thus providing a basis for finally determining the sealing performance of the target explosion-proof valve 1.

[0307] The operation of discharging the gas in the second cavity to the outside can be realized by setting a pressure relief valve on the sealing cover 3, or by performing a negative pressure suction operation on the inner cavity of the sealing cover 3 by the negative pressure device 10; a second valve 19 can be provided on the connection path between the negative pressure device 10 and the inner cavity of the sealing cover 3. By opening the second valve 19, the negative pressure device 10 can start to perform a negative pressure suction operation on the inner cavity of the sealing cover 3.

[0308] In some embodiments, referring to Figure 7 , the steps of discharging the gas in the second cavity to the outside include:

[0309] Obtain the second pressure value of the second cavity;

[0310] When the second pressure value reaches the fourth pressure threshold, stop discharging the gas in the second cavity to the outside.

[0311] During the process of emptying the gas in the second cavity, the air pressure in the second cavity will gradually decrease; by obtaining the second pressure value of the second cavity and comparing it with the preset fourth pressure threshold, the exhaust operation can be stopped after ensuring that the gas in the second cavity has been emptied to the preset level (that is, when the second pressure value reaches the fourth pressure threshold), which can help the tester more accurately control the above exhaust process.

[0312] Specifically, when performing a negative pressure suction operation on the inner cavity of the sealing cover 3 through the negative pressure device 10 to evacuate the gas in the second cavity, the above-mentioned second pressure value can be obtained by the first pressure sensor 15 disposed in the connection path between the negative pressure device 10 and the sealing cover 3. Thus, it is possible to intuitively determine whether there is air leakage or other situations during the negative pressure suction process, and the negative pressure suction operation can be stopped after ensuring that the gas in the sealing cover 3 has been evacuated to a preset level (i.e., when the second pressure value reaches the fourth pressure threshold), thereby helping the tester to more accurately control the above-mentioned negative pressure suction process.

[0313] It should be noted that a second valve 19 can be provided on the connection path between the negative pressure device 10 and the inner cavity of the sealing cover 3. By closing the second valve 19, the negative pressure device 10 can be stopped from performing a negative pressure suction operation on the inner cavity of the sealing cover 3.

[0314] In some embodiments, referring to Figures 5 to 7 , before the step of driving the suction member 4 to fit with the valve cover 102 of the target explosion-proof valve 1, the operation method of the explosion-proof valve detection process further includes the following steps:

[0315] A second cavity is formed by covering the end of the target explosion-proof valve 1 provided with the valve cover 102 with the sealing cover 3; the suction member 4 is disposed in the second cavity, and the adsorption end of the suction member 4 communicates with the second cavity;

[0316] After the step of stopping the suction operation on the suction member 4 to separate the valve cover 102 from the suction member 4 and re-cover it on the vent port, the operation method of the explosion-proof valve detection process further includes the following steps:

[0317] Perform a suction operation on the suction member 4 to discharge the gas in the second cavity to the outside.

[0318] This embodiment provides another way to perform a negative pressure suction operation on the inner cavity of the sealing cover 3. This way is parallel to the way of directly pumping out the gas in the inner cavity of the sealing cover 3 through the negative pressure device 10 in the above-mentioned embodiment, and either way can be selected arbitrarily during the actual test. Specifically, based on the way adopted in this embodiment, when the suction member 4 is separated from the valve cover 102, the adsorption end of the suction member 4 (specifically, the adsorption concave cavity 401 of the suction member 4) communicates with the inner cavity of the sealing cover 3. At this time, a negative pressure suction operation can be performed on the suction member 4 through the negative pressure device 10 to pump out the gas in the inner cavity of the sealing cover 3 through the suction member 4, so that the gas in the second cavity can be evacuated in the same way.

[0319] It should be noted that a third valve 20 can be provided on the connection path between the negative pressure device 10 and the suction member 4. By opening the third valve 20, the negative pressure device 10 can start to perform a negative pressure suction operation on the suction member 4.

[0320] In some embodiments, referring to Figure 7 , the step of performing a suction operation on the adsorbent 4 to discharge the gas in the second cavity to the outside includes:

[0321] Obtain a third pressure value of the suction channel of the adsorbent 4;

[0322] When the third pressure value reaches a fourth pressure threshold, stop the suction operation on the adsorbent 4.

[0323] During the process of performing a negative pressure suction operation on the adsorbent 4 by the negative pressure device 10 to evacuate the gas in the inner cavity of the sealing cover 3, the air pressure in the inner cavity of the sealing cover 3 will gradually decrease. Since the adsorption end of the adsorbent 4 (specifically, the adsorption cavity 401 of the adsorbent 4) is in communication with the inner cavity of the sealing cover 3, the third pressure value in the connection path between the negative pressure device 10 and the adsorbent 4 (i.e., the suction channel of the adsorbent 4 described above) will also gradually decrease; at this time, the above-mentioned third pressure value is obtained by the second pressure sensor 16, and it is possible to intuitively judge whether there is air leakage or other situations during the suction process, and the negative pressure suction operation can be stopped after ensuring that the gas in the sealing cover 3 has been evacuated to a preset level (i.e., when the third pressure value reaches the fourth pressure threshold), so as to help the tester more accurately control the above-mentioned negative pressure suction process.

[0324] It should be noted that a third valve 20 can be provided on the connection path between the negative pressure device 10 and the adsorbent 4 (i.e., the suction channel of the adsorbent 4 described above). By closing the third valve 20, the negative pressure device 10 can be stopped from performing a negative pressure suction operation on the adsorbent 4.

[0325] In some embodiments, referring to Figure 7 , after the step of discharging the gas in the second cavity to the outside, the operation method of the explosion-proof valve detection process further includes the following steps:

[0326] Let the target explosion-proof valve 1 stand still for a preset time.

[0327] Since gas is fluid, within a period of time after discharging the gas in the second cavity to the outside, the air flow in the second cavity is still in an unstable state, and there may be deviations in air pressure detection at this time, which may lead to misjudgment. Based on this situation, in this embodiment, after the exhaust is completed, the target explosion-proof valve 1 is left standing for a preset time to make the air flow in the second cavity tend to be stable and the air pressure tend to be balanced, and then the pressure tester 17 can be used to detect the pressure change situation of the second cavity, so as to further improve the accuracy of the final airtightness detection result.

[0328] In some embodiments, referring to Figure 7 , after the step of discharging the gas in the second cavity to the outside, the operation method of the explosion-proof valve detection process further includes the following steps:

[0329] Obtain the second pressure change amount of the second cavity within a preset time;

[0330] When the second pressure change amount reaches the second change amount threshold, output a fourth abnormal prompt message.

[0331] Specifically, after the valve cover 102 is re-covered on the target explosion-proof valve 1, a first closed chamber is formed inside the battery pack 2 and inside the valve body 101 of the target explosion-proof valve 1, and the inner cavity of the sealing cover 3 forms a second cavity. When the sealing is normal (specifically, when the sealing between the valve cover 102 and the valve body 101 is normal), the first closed chamber and the second cavity are not connected to each other; after discharging the gas in the second chamber, a pressure difference will be formed between the second cavity and the first closed chamber. Subsequently, if it is detected that the air pressure in the second cavity increases, it may be that the gas in the first closed chamber leaks into the second cavity through the abnormally sealed position at the valve cover 102.

[0332] Based on the above considerations, in this embodiment, after emptying the gas in the second cavity, by obtaining the second pressure change amount of the second cavity within a preset time and making a judgment, if the second pressure change amount reaches the second change amount threshold, it indicates that there may be an abnormal sealing situation at the connection between the valve cover 102 and the valve body 101, resulting in the gas in the first closed chamber leaking into the second cavity, causing the air pressure in the second cavity to increase abnormally. At this time, a fourth abnormal prompt message can be output to remind the tester to intervene and handle it in time.

[0333] Specifically, the operation of obtaining the second pressure change amount of the second cavity within a preset time can be achieved by detecting the air pressure change situation in the inner cavity of the sealing cover 3 with a pressure tester 17.

[0334] Based on the above settings, accurate detection of the sealing performance of the target explosion-proof valve 1 itself can be realized.

[0335] Further, referring to Figures 5 to 8, in an exemplary embodiment, the negative pressure device 10 is connected to the inner cavities of the adsorbent 4 and the sealing cover 3 through two connecting passages respectively, and the air supply device 9 is connected to the inner cavities of the adsorbent 4 and the sealing cover 3 through two connecting passages respectively; the first pressure sensor 15 is connected to the connecting passage between the air supply device 9 and the inner cavity of the sealing cover 3 and the connecting passage between the negative pressure device 10 and the inner cavity of the sealing cover 3. More specifically, the first pressure sensor 15 can be connected to the inner cavity of the sealing cover 3 in a direct connection or an indirect connection manner; the first pressure sensor 15 is used to obtain the first pressure value in the connecting passage between the air supply device 9 and the inner cavity of the sealing cover 3, and the first pressure sensor 15 is used to obtain the second pressure value in the connecting passage between the negative pressure device 10 and the inner cavity of the sealing cover 3; the second pressure sensor 16 is connected to the connecting passage between the negative pressure device 10 and the adsorbent 4 and the connecting passage between the air supply device 9 and the adsorbent 4. More specifically, the second pressure sensor 16 can be connected to the adsorbent 4 in a direct connection or an indirect connection manner; the second pressure sensor 16 is used to obtain the third pressure value in the connecting passage between the negative pressure device 10 and the adsorbent 4, and the second pressure sensor 16 is used to obtain the fourth pressure value in the connecting passage between the air supply device 9 and the adsorbent 4.

[0336] The pressure tester 17 communicates with the inner cavity of the sealing cover 3 and can obtain the pressure change situation of the inner cavity of the sealing cover 3.

[0337] A first valve 18 is provided on the connecting passage between the air supply device 9 and the sealing cover 3, a second valve 19 is provided on the connecting passage between the negative pressure device 10 and the inner cavity of the sealing cover 3, a third valve 20 is provided on the connecting passage between the negative pressure device 10 and the adsorbent 4, and a fourth valve 21 is provided on the connecting passage between the air supply device 9 and the adsorbent 4.

[0338] Based on the above settings, referring to Figure 8 , the corresponding complete airtightness test process is as follows:

[0339] S1, evacuating the adsorbent 4: Drive the adsorbent 4 to fit with the valve cover 102 so that a closed chamber is formed between the adsorption cavity 401 of the adsorbent 4 and the valve cover 102; open the third valve 20, and perform a negative pressure pumping operation on the closed chamber between the adsorption cavity 401 and the valve cover 102 through the negative pressure device 10 to make the closed chamber form a vacuum environment; during the negative pressure pumping process, detect the pressure value (i.e., the third pressure value) of the closed chamber through the second pressure sensor 16. If the third pressure value is not greater than the first pressure threshold, it means that the seal between the adsorbent 4 and the valve cover 102 is normal, and if the third pressure value is greater than the first pressure threshold, it means that the seal between the adsorbent 4 and the valve cover 102 is abnormal and needs to be reassembled or analyzed for the abnormality;

[0340] S2. Open the valve cover 102: Drive the suction attachment 4 to move, so as to drive the valve cover 102 to separate from the valve body 101 and enter the valve-opening state; During the process of driving the valve cover 102 to open, according to the third pressure value obtained by the second pressure sensor 16, it can be accurately judged whether the valve cover 102 is lifted and whether there is a false detection situation (that is, the explosion-proof valve tooling is not correctly connected to the target explosion-proof valve 1);

[0341] S3. Inflate the battery pack 2: Open the first valve 18, and the gas supply device 9 sequentially fills the battery pack 2 with gas through the sealing cover 3 and the valve body 101; When the first pressure sensor 15 detects that the first pressure value reaches the third pressure threshold, the first valve 18 is closed to make the gas supply device 9 stop the inflation operation;

[0342] S4. First balance operation: Let the target explosion-proof valve 1 stand for a preset time, so that the air pressure in the closed chamber formed by the inside of the battery pack 2, the inside of the valve body 101 of the target explosion-proof valve 1, and the inner cavity of the sealing cover 3 tends to be balanced;

[0343] S5. Air tightness detection of the battery pack 2: Obtain the first pressure change amount (specifically the pressure drop value) in the inner cavity of the sealing cover 3 (that is, the closed chamber formed by the inside of the battery pack 2, the inside of the valve body 101 of the target explosion-proof valve 1, and the inner cavity of the sealing cover 3) within a preset time through the pressure tester 17, so as to realize the detection of the sealing performance of the battery pack 2;

[0344] S6. Reset the valve cover 102: Close the third valve 20, open the fourth valve 21, and let the gas supply device 9 supply gas into the adsorption cavity 401 of the suction attachment 4, so that the negative pressure state of the closed chamber formed by the adsorption cavity 401 and the valve cover 102 disappears and enters the positive pressure state, so that the valve cover 102 separates from the suction attachment 4, and the valve cover 102 can be reset to close with the valve body 101 under the elastic force of the spring, that is, the valve cover 102 closes again, and then the fourth valve 21 is closed;

[0345] S7. Exhaust the sealing cover 3: In one embodiment, open the second valve 19, and directly perform a negative pressure suction operation on the inner cavity of the sealing cover 3 through the negative pressure device 10 to reduce the air pressure in the sealing cover 3; When the first pressure sensor 15 detects that the second pressure value reaches the fourth pressure threshold, the second valve 19 is closed;

[0346] In another embodiment, open the third valve 20, and perform a negative pressure suction operation on the suction attachment 4 through the negative pressure device 10 to realize the evacuation of the gas in the inner cavity of the sealing cover 3; When the second pressure sensor 16 detects that the third pressure value reaches the fourth pressure threshold, the third valve 20 is closed;

[0347] S8, Second balancing operation: Leave the explosion-proof valve detection system static for a preset time so that the air pressure in the closed chamber formed by the inner cavity of the sealing cover 3 tends to be balanced;

[0348] S9, Air tightness detection of the target explosion-proof valve 1: Obtain the second pressure change amount (specifically, the pressure increase value) in the inner cavity of the sealing cover 3 within the preset time through the pressure tester 17 to detect the sealing performance of the target explosion-proof valve 1 itself;

[0349] S10, End of air tightness detection.

[0350] It should be noted that for other contents of the explosion-proof valve detection system and the operation method of the explosion-proof valve detection process disclosed in this application, reference can be made to the prior art and will not be elaborated here.

[0351] The above are only optional embodiments of this application, and do not limit the patent scope of this application. Any equivalent structural transformation made using the content of the specification and drawings of this application under the technical concept of this application, or any direct / indirect application in other related technical fields, is included in the patent protection scope of this application.

Claims

1. An explosion-proof valve detection system, characterized in that, The explosion-proof valve detection system includes a target explosion-proof valve, a negative pressure device, an air supply device and an explosion-proof valve tooling; the explosion-proof valve tooling includes: A sealing cover, the sealing cover is arranged at one end of the target explosion-proof valve provided with a valve cover; An adsorption member, wherein the adsorption member is arranged in the sealing cover, the portion of the adsorption member used to contact the valve cover constitutes an adsorption end, a channel is arranged in the adsorption member, one end of the channel is communicated with the adsorption end, and the other end of the channel penetrates to the outside and is communicated with the negative pressure device; the negative pressure device is used to perform a suction operation on the adsorption end when in contact with the valve cover through the channel, so that the adsorption end adsorbs the valve cover under the action of negative pressure; and the negative pressure device is used to perform a suction operation on the adsorption end when not in contact with the valve cover through the channel, so as to extract the gas in the inner cavity of the sealing cover outwardly; a first driving member, the first driving member being in driving connection with the adsorption member; the first driving member being used to drive the adsorption member to move relative to the sealing cover so that the adsorption member contacts the valve cover and drives the valve cover to open; A fixing bracket, the fixing bracket is used to be fixedly connected to the valve body of the target explosion-proof valve, and the sealing cover is movably connected to the fixing bracket; the fixing bracket includes a top wall and a side wall, the side wall is arranged around the periphery of the top wall to form a receiving cavity, the sealing cover is arranged in the receiving cavity, and the receiving cavity is used to receive at least a part of the target explosion-proof valve; an inflation pipe, the inflation pipe being a pipe inserted into the sealing cover, the inflation pipe being slidably inserted into the top wall along a first direction, one end of the inflation pipe being communicated with the inner cavity of the sealing cover, and the other end of the inflation pipe being used to connect an air supply device; the air supply device being used to inflate the inner cavity of the sealing cover through the inflation pipe when the valve cover is opened so as to inflate the interior of the battery pack so as to perform an air tightness test on the interior of the battery pack, the interior of the valve body of the target explosion-proof valve and the closed chamber formed between the inner cavity of the sealing cover; a second pressure sensor, the second pressure sensor being used to obtain a third pressure value in the connection passage between the negative pressure device and the adsorbent, so as to confirm whether the adsorbent drives the valve cover to open, or to confirm whether the gas in the inner cavity of the sealing cover is emptied; The negative pressure device and the air supply device are connected to the inner cavity of the sealing cover through the inflation pipe, and the negative pressure device and the air supply device are connected to the adsorption component through the same ventilation pipe. The inflation pipe is arranged at a center interval with the adsorption end; the air supply device is used to inflate the adsorption component and push the valve cover to be re-covered on the valve body, so as to directly close the valve cover after the battery pack is fully inflated; when the valve cover is re-covered on the valve body, the negative pressure device is used to discharge the air in the sealing cover to the outside through the inflation pipe.

2. The explosion-proof valve detection system according to claim 1, wherein The explosion-proof valve tooling also includes a second driving member, which is transmission-connected to the sealing cover; the second driving member is used to drive the sealing cover to move along a first direction so that the sealing cover covers or moves away from an end of the target explosion-proof valve where the valve cover is provided.

3. The explosion-proof valve detection system according to claim 1, wherein A flexible buffer layer is provided at the opening of the sealing cover; when the sealing cover is provided at one end of the target explosion-proof valve provided with the valve cover, the flexible buffer layer is used to fit with the target explosion-proof valve.

4. The explosion-proof valve detection system according to claim 1, wherein, The explosion-proof valve tooling further includes a first guide rod, which is slidably disposed in the sealing cover along a first direction, one end of the first guide rod is connected to the adsorption member, and the other end of the first guide rod is connected to the first driving member; The first driving member is used to drive the first guide rod to move along the first direction to drive the adsorption member to move.

5. The explosion-proof valve detection system according to claim 4, wherein, The explosion-proof valve tooling also includes a first elastic member, which is sleeved on the first guide rod and elastically supported between the adsorption member and the sealing cover.

6. The explosion-proof valve detection system according to claim 1, characterized in that, The explosion-proof valve tooling also includes a second driving member and a second guide rod, wherein the second driving member is in driving connection with the sealing cover; the second driving member is used to drive the sealing cover to move along a first direction so that the sealing cover covers or moves away from an end of the target explosion-proof valve provided with the valve cover; The second guide rod is slidably arranged in the fixed bracket along the first direction, one end of the second guide rod is connected to the sealing cover, and the other end of the second guide rod is connected to the second driving member; the second driving member is used to drive the second guide rod to move along the first direction to drive the sealing cover to move.

7. The explosion-proof valve detection system according to claim 6, characterized in that, The explosion-proof valve tooling also includes a second elastic member, which is sleeved on the second guide rod and elastically supported between the sealing cover and the fixing bracket.

8. The explosion-proof valve detection system according to claim 6, characterized in that, The second driving member includes a second cam portion and a second gripping portion, the second cam portion is rotatably connected to the second guide rod around a second axis, the second cam portion abuts against the fixed bracket, and the second axis is perpendicular to the first direction; the second gripping portion is connected to the second cam portion.

9. The explosion-proof valve detection system according to claim 6, characterized in that The explosion-proof valve tooling further includes a first guide rod, which is slidably arranged in the sealing cover along the first direction, one end of the first guide rod is connected to the adsorption member, and the other end of the first guide rod is connected to the first driving member; The first driving member is used to drive the first guide rod to move along the first direction to drive the adsorption member to move; The second guide rod is a hollow structure, and the first guide rod is slidably connected to the inner cavity of the second guide rod along the first direction.

10. The explosion-proof valve detection system according to claim 9, wherein, The first driving member includes a first cam portion and a first holding portion, the first cam portion is rotatably connected to an end of the first guide rod facing away from the adsorption member around a first axis, the first cam portion abuts against the second guide rod, and the first axis is perpendicular to the first direction; the first holding portion is connected to the first cam portion.

11. The explosion-proof valve detection system according to claim 9, wherein, The adsorbing member is provided with an adsorption cavity, the first guide rod is provided with an adsorption channel, and the second guide rod is provided with a connection channel; the adsorption cavity is used to face the valve cover, one end of the adsorption channel communicates with the adsorption cavity, the other end of the adsorption channel communicates with one end of the connection channel, and the other end of the connection channel is used to connect to a negative pressure device.

12. The explosion-proof valve detection system according to claim 2, wherein, Both the first driving member and the second driving member are arranged outside the fixed bracket.

13. The explosion-proof valve detection system according to claim 1, characterized in that, A limiting flange protrudes at the opening at one end of the side wall away from the top wall, and the limiting flange is used for snap-fitting into the limiting groove of the target explosion-proof valve.

14. The explosion-proof valve detection system according to claim 1, wherein, The air supply device is used to separate the adsorbing member from the valve cover under the action of positive pressure.

15. The explosion-proof valve detection system according to claim 1, wherein The explosion-proof valve detection system further includes a first pressure sensor, and the first pressure sensor is used to obtain a first pressure value in the connection path between the air supply device and the sealing cover.

16. The explosion-proof valve detection system according to claim 1, wherein, The explosion-proof valve detection system further includes a first pressure sensor, and the first pressure sensor is used to obtain a second pressure value in the connection path between the negative pressure device and the sealing cover.

17. The explosion-proof valve detection system according to claim 14, characterized in that, The second pressure sensor is used to obtain a fourth pressure value in the connection path between the air supply device and the adsorbing member.

18. The explosion-proof valve detection system according to any one of claims 1 to 17, characterized in that, The explosion-proof valve detection system further includes a pressure tester, and the pressure tester is used to obtain the pressure change amount in the inner cavity of the sealing cover within a preset time.

19. An operating method for an explosion-proof valve detection process, applied to the explosion-proof valve detection system according to any one of claims 1 to 18, characterized in that, The operation method of the explosion-proof valve detection process includes the following steps: Drive the adsorbing member to fit with the valve cover of the target explosion-proof valve, so that at least part of the adsorbing member forms a first cavity with the valve cover; Perform a suction operation on the first cavity; After a preset time after the suction operation is completed, obtain a third pressure value in the first cavity; Drive the adsorbing member to move, so as to drive the valve cover to open and expose the vent port sealed by the valve cover; The step of driving the adsorbing member to move includes: When the third pressure value is not greater than the first pressure threshold, drive the adsorbing member to move; When the third pressure value is greater than the first pressure threshold, output a first abnormal prompt message; After the step of driving the adsorbing member to move, the operation method of the explosion-proof valve detection process further includes the following steps executed in sequence: Inflate the inside of the target explosion-proof valve through the vent port to inflate the inside of the battery pack, so as to perform an airtightness test on the closed chamber formed between the inside of the battery pack, the inside of the valve body of the target explosion-proof valve and the inner cavity of the sealing cover; Stop the suction operation on the adsorbing member, and perform an inflation operation on the adsorbing member, so that the valve cover is separated from the adsorbing member under the action of positive pressure and re-seals the vent port, so as to directly perform the closing operation of the valve cover after the battery pack is inflated; Discharge the gas in the second cavity, and the second cavity is formed by covering one end of the target explosion-proof valve provided with the valve cover with a sealing cover, and the adsorbing member is arranged in the second cavity.

20. The operating method of the explosion-proof valve detection process according to claim 19, characterized in that, After the step of driving the adsorbing member to move, so as to drive the valve cover to open and expose the vent port sealed by the valve cover, the operation method of the explosion-proof valve detection process further includes the following steps: When the third pressure value increases to the second pressure threshold, a second abnormal prompt message is output; the second pressure threshold is greater than the first pressure threshold.

21. The operating method of the explosion-proof valve detection process according to claim 19, characterized in that, Before the step of driving the suction member to fit with the valve cover of the target explosion-proof valve, the operation method of the explosion-proof valve detection process further includes the following steps: A second cavity is formed by covering one end of the target explosion-proof valve provided with the valve cover with a sealing cover; the suction member is arranged in the second cavity; The step of inflating the inside of the target explosion-proof valve through the ventilation port includes: Inflating the second cavity so that the inflated gas enters the inside of the target explosion-proof valve through the ventilation port.

22. The operating method of the explosion-proof valve detection process according to claim 21, wherein The step of inflating the second cavity so that the inflated gas enters the inside of the target explosion-proof valve through the ventilation port includes: Obtain the first pressure value of the second cavity; When the first pressure value reaches the third pressure threshold, stop inflating the second cavity.

23. The operating method of the explosion-proof valve detection process according to claim 21, characterized in that, After the step of inflating the second cavity so that the inflated gas enters the inside of the target explosion-proof valve through the ventilation port, the operation method of the explosion-proof valve detection process further includes the following steps: Obtain the first pressure change amount of the second cavity within a preset time; When the first pressure change amount reaches the first change amount threshold, output a third abnormal prompt message.

24. The operation method of the explosion-proof valve detection process according to claim 21, characterized in that, Before the step of obtaining the first pressure change amount of the second cavity within a preset time, the operation method of the explosion-proof valve detection process further includes the following steps: Let the target explosion-proof valve stand still for a preset time.

25. The operating method of the explosion-proof valve detection process according to claim 19, characterized in that, The step of discharging the gas in the second cavity includes: Obtain the second pressure value of the second cavity; When the second pressure value reaches the fourth pressure threshold, stop discharging the gas in the second cavity.

26. The operating method of the explosion-proof valve detection process according to claim 19, characterized in that, Before the step of driving the suction member to fit with the valve cover of the target explosion-proof valve, the operation method of the explosion-proof valve detection process further includes the following steps: A second cavity is formed by covering one end of the target explosion-proof valve provided with the valve cover with a sealing cover; the suction member is arranged in the second cavity, and the adsorption end of the suction member communicates with the second cavity; After the step of stopping the suction operation on the suction member, separating the valve cover from the suction member and re-sealing it on the ventilation port, the operation method of the explosion-proof valve detection process further includes the following steps: Perform a suction operation on the suction member to discharge the gas in the second cavity to the outside.

27. The operating method of the explosion-proof valve detection process according to claim 26, wherein The step of performing a suction operation on the suction member to discharge the gas in the second cavity to the outside includes: Obtain the third pressure value of the suction channel of the suction member; When the third pressure value reaches the fourth pressure threshold, stop the suction operation on the suction member.

28. The operating method of the explosion-proof valve detection process according to claim 19 or 26, characterized in that, After the step of discharging the gas in the second cavity, the operation method of the explosion-proof valve detection process further includes the following steps: Let the target explosion-proof valve stand still for a preset time.

29. The operation method of the explosion-proof valve detection process according to claim 19 or 26, characterized in that, After the step of discharging the gas in the second cavity, the operation method of the explosion-proof valve detection process further includes the following steps: Obtain the second pressure change amount of the second cavity within a preset time; When the second pressure change amount reaches the second change amount threshold, output a fourth abnormal prompt message.

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