Helium detection device, battery detection system and helium detection method

Abstract

The invention discloses a helium detection device, a battery detection system and a helium detection method, and belongs to the technical field of battery helium detection. The helium detection device comprises a helium detection main pipeline; the helium detection sealing head is used for covering a cap of a battery to be detected before helium detection so as to form a helium detection cavity, and the helium detection cavity is communicated with the helium detection main pipeline; the leak detector is selectively communicated with the helium detection main pipeline; the helium detection vacuum pump is selectively communicated with the helium detection main pipeline; and the standard leak hole is selectively communicated with the helium detection main pipeline and is configured to calibrate the error rate of the helium detection device. By additionally arranging the standard leak hole in the helium detection main pipeline, comprehensive calibration of the helium detection device and the to-be-detected battery is realized, the influence of various factors on the helium detection result can be comprehensively considered, and the detection result is accurately compensated, so that the helium detection error is remarkably reduced, and the helium detection accuracy and reliability are improved.

Description

Technical Field

[0001] The present application belongs to the technical field of battery helium detection, and in particular relates to a helium detection device, a battery detection system and a helium detection method. Background Art

[0002] In the battery manufacturing industry, helium detection technology is an important sealing detection method and is widely used in sealing performance detection of battery caps and other components. However, the traditional helium detection process has certain limitations. Specifically, the existing helium detection system is often only equipped with a standard leak hole on the leak detector for preliminary calibration of the sensitivity of the leak detector. However, this single calibration method ignores the impact of other factors in the leak detection process (such as the sealing of the helium detection chamber, the complexity of the gas flow path, etc.) on the test results. Therefore, it is impossible to fully compensate for the helium detection results, resulting in relatively large detection errors. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a helium detection device, a battery detection system and a helium detection method to accurately compensate the detection results, reduce the error of helium detection, and improve the accuracy and reliability of helium detection.

[0004] In a first aspect, the present application provides a helium detection device, which is applied to a battery detection system, comprising:

[0005] Helium main inspection line;

[0006] A helium detection sealing head, which is used to be covered outside the cap of the battery to be detected before helium detection to form a helium detection cavity, and the helium detection cavity is connected to the helium detection main line;

[0007] A leak detector, the leak detector being selectively connectable to the helium detection main line;

[0008] A helium detection vacuum pump, which can be selectively connected to the helium detection main line;

[0009] A standard leak hole, which can be selectively connected to the helium detection main line, is configured to calibrate the error rate of the helium detection device.

[0010] According to the helium detection device of the present application, by adding a standard leak hole on the helium detection main line as mentioned above, a comprehensive calibration of the helium detection device and the battery to be detected is achieved, and the influence of various factors on the helium detection results can be comprehensively considered, and the detection results can be accurately compensated, thereby significantly reducing the error of helium detection and improving the accuracy and reliability of helium detection.

[0011] According to one embodiment of the present application, the helium detection device further includes:

[0012] A helium detection valve, through which the leak detector is connected to the helium detection main line;

[0013] A first branch pipeline and a helium detection vacuum valve, wherein the first branch pipeline is connected between the helium detection main pipeline and the helium detection vacuum pump, and the helium detection vacuum valve is arranged on the first branch pipeline;

[0014] A second branch pipeline and a standard leak valve, wherein the second branch pipeline is connected between the helium detection main pipeline and the standard leak hole, and the standard leak valve is arranged on the second branch pipeline.

[0015] According to one embodiment of the present application, the helium detection device further includes:

[0016] a cavity cleaning pump, the cavity cleaning pump being selectively connectable to the helium detection main line;

[0017] A pre-pump, the pre-pump being connected to the leak detector;

[0018] A nitrogen source is selectively connectable to the helium detection main line.

[0019] According to one embodiment of the present application, the helium detection device further includes:

[0020] A third branch pipeline and a cavity clearing valve, wherein the third branch pipeline is connected between the helium detection main pipeline and the cavity clearing pump, and the cavity clearing valve is arranged on the third branch pipeline;

[0021] A fourth branch pipeline and a nitrogen injection valve, wherein the fourth branch pipeline is connected between the helium detection main pipeline and the nitrogen source, and the nitrogen injection valve is arranged on the fourth branch pipeline.

[0022] According to one embodiment of the present application, the helium detection device further includes:

[0023] a fifth branch pipeline and a first air-breaking valve, wherein one end of the fifth branch pipeline is connected to the helium detection main pipeline, and the other end is connected to the external environment, and the first air-breaking valve is arranged on the fifth branch pipeline;

[0024] A first pressure sensor is used to detect the gas pressure in the helium detection main line.

[0025] In a second aspect, the present application provides a battery detection system, the battery detection system comprising:

[0026] A testing platform, wherein the testing platform has a testing position for placing a battery to be tested;

[0027] A conveying device, the conveying device is used to convey the battery to be tested to the testing position;

[0028] A helium compression device, which is installed on the detection platform and is used to compress helium on the cap of the battery to be detected;

[0029] As described in any one of the above helium detection devices, the helium detection device is installed on the detection platform, and is used to detect helium on the cap of the battery to be detected after helium is compressed.

[0030] According to the battery testing system of the present application, through the setting of the above-mentioned helium detection device, a comprehensive calibration of the helium detection device and the battery to be detected is achieved, and the influence of various factors on the helium detection results can be comprehensively considered, and the detection results can be accurately compensated, thereby significantly reducing the error of helium detection and improving the accuracy and reliability of helium detection.

[0031] According to one embodiment of the present application, the helium compression device comprises:

[0032] A helium compression main line and a helium compression sealing head, wherein the helium compression sealing head is used to be arranged outside the cap of the battery to be tested before helium compression to form a helium compression cavity, and the helium compression cavity is connected to the helium compression main line;

[0033] A helium source and a helium compression valve, wherein the helium source is connected to the helium compression main line through the helium compression valve;

[0034] a helium injection vacuum pump and a helium injection vacuum valve, wherein the helium injection vacuum pump is connected to the helium compression main line through the helium injection vacuum valve;

[0035] A helium recovery system and a helium recovery valve, wherein the helium recovery system is connected to the compressed helium main line through the helium recovery valve;

[0036] a second air-breaking valve, through which the helium-compressed main line is connected to the external environment;

[0037] A second pressure sensor is used to detect the gas pressure in the helium pressure main line.

[0038] According to one embodiment of the present application, the detection platform includes multiple detection areas, each of which is equipped with the helium compression device and the helium detection device, each of which has multiple detection positions, and the helium compression device and the helium detection device are configured to compress and detect helium on multiple batteries to be tested placed in the multiple detection positions.

[0039] In a third aspect, the present application provides a helium detection method, which is applied to a battery detection system as described in any one of the above, and the helium detection method includes:

[0040] After the battery to be tested reaches the testing position and is fixed, the helium testing sealing head is controlled to seal the cap of the battery to be tested to form a helium testing cavity;

[0041] Control the helium detection vacuum pump to evacuate the helium detection main line and the helium detection cavity;

[0042] After evacuation, the control leak detector and the standard leak hole are connected to the main helium detection line;

[0043] Obtain the standard leak rate of the standard leak hole and the calibrated measurement leak rate of the leak detector;

[0044] Based on the calibrated measurement leak rate and the standard leak rate, obtaining an error rate of the helium detection device;

[0045] Controlling the helium pressing device to pressurize the cap of the battery to be tested with helium;

[0046] Controlling the helium detection device to detect the helium on the cap of the battery to be detected after the helium is compressed to obtain the helium detection leakage rate of the leak detector;

[0047] Based on the helium detection leak rate and the error rate, obtaining the actual helium detection leak rate;

[0048] Based on the actual helium leak rate and the standard leak rate, it is determined whether the air tightness of the cap of the battery to be tested is qualified.

[0049] According to the helium detection method of the present application, by introducing the calibration process before the helium compression process, a comprehensive calibration of the helium detection device and the battery to be detected is achieved, and the influence of various factors on the helium detection results can be comprehensively considered, and the detection results can be accurately compensated, thereby significantly reducing the error of the helium detection and improving the accuracy and reliability of the helium detection.

[0050] According to an embodiment of the present application, the step of determining whether the air tightness of the cap of the battery to be tested is qualified based on the actual leak rate of the helium test and the standard leak rate includes:

[0051] comparing the actual leak rate of the helium test with the standard leak rate;

[0052] When the comparison result shows that the difference between the actual helium leak rate and the standard leak rate is within a preset range, determining that the air tightness of the cap of the battery to be tested is qualified;

[0053] When the comparison result shows that the difference between the actual helium leak rate and the standard leak rate exceeds a preset range, it is determined that the airtightness of the cap of the battery to be tested is unqualified.

[0054] According to one embodiment of the present application, the error rate of the helium detection device is obtained based on the calibrated measurement leak rate and the standard leak rate, including: the error rate = the standard leak rate / the calibrated measurement leak rate; and the actual helium detection leak rate is obtained based on the helium detection leak rate and the error rate, including: the actual helium detection leak rate = the helium detection leak rate × the error rate.

[0055] According to one embodiment of the present application, after obtaining the standard leak rate of the standard leak hole and the calibrated measurement leak rate of the leak detector, the method further includes:

[0056] Control the nitrogen source to be connected to the helium detection main line, and inject nitrogen into the helium detection main line and the helium detection cavity for purging;

[0057] After purging, the cavity cleaning pump is controlled to be connected with the main helium detection line to clean the main helium detection line and the helium detection cavity;

[0058] After the cavity is cleared, the main helium detection line is controlled to be connected to the external environment, and the vacuum of the main helium detection line and the helium detection cavity is broken;

[0059] Control the helium detection sealing head to break contact with the battery to be detected.

[0060] According to an embodiment of the present application, the helium detection leakage rate includes: a maximum measurement value of the leak detector within a target time period and a measurement value at a termination time.

[0061] According to one embodiment of the present application, the helium pressure controlling device pressurizes the cap of the battery to be inspected with helium, including:

[0062] Controlling the helium pressure sealing head to seal the cap of the battery to be tested to form a helium pressure cavity;

[0063] Control the helium pressure vacuum pump to evacuate the helium pressure main line and the helium pressure cavity;

[0064] After evacuation, the helium source is controlled to be connected with the helium pressure main line, and helium is injected into the helium pressure main line and the helium pressure cavity to maintain the pressure;

[0065] After the pressure maintenance is completed, the helium recovery system is controlled to be connected with the helium compression main line to recover the helium in the helium compression main line and the helium compression chamber;

[0066] After recovery, the main helium pressure line is controlled to be connected to the external environment, and the vacuum of the main helium pressure line and the helium pressure chamber is broken;

[0067] The helium pressure sealing head is controlled to be out of contact with the battery to be tested.

[0068] According to an embodiment of the present application, the controlling helium detection device performs helium detection on the cap of the battery to be detected after helium is compressed to obtain the helium detection leakage rate of the leak detector, including:

[0069] Controlling the helium detection sealing head to seal the cap of the battery to be detected to form a helium detection cavity;

[0070] Control the helium detection vacuum pump to evacuate the helium detection main line and the helium detection cavity;

[0071] After evacuation, the control leak detector is connected to the main helium detection line;

[0072] Obtain the helium detection leak rate of the leak detector;

[0073] Control the nitrogen source to be connected to the helium detection main line, and inject nitrogen into the helium detection main line and the helium detection cavity for purging;

[0074] After purging, the cavity cleaning pump is controlled to be connected with the main helium detection line to clean the main helium detection line and the helium detection cavity;

[0075] After the cavity is cleared, the main helium detection line is controlled to be connected to the external environment, and the vacuum of the main helium detection line and the helium detection cavity is broken;

[0076] Control the helium detection sealing head to break contact with the battery to be detected.

[0077] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0079] Figure 1 It is a structural schematic diagram of a battery detection system and a battery to be detected provided in an embodiment of the present application;

[0080] Figure 2 is a schematic diagram of the structure of a helium detection device provided in an embodiment of the present application;

[0081] Figure 3 It is a schematic diagram of the cooperation between the helium detection device and the battery to be detected provided in the embodiment of the present application;

[0082] Figure 4 is a schematic diagram of the structure of a helium compression device provided in an embodiment of the present application;

[0083] Figure 5 It is a schematic diagram of the cooperation between the helium compression device and the battery to be tested provided in the embodiment of the present application;

[0084] Figure 6 This is one of the flow charts of the helium detection method provided in the embodiment of the present application;

[0085] Figure 7 This is the second flow chart of the helium detection method provided in the embodiment of the present application;

[0086] Figure 8 This is the third flow chart of the helium detection method provided in the embodiment of the present application;

[0087] Fig. 9 This is the fourth flow chart of the helium detection method provided in the embodiment of the present application.

[0088] Reference numerals:

[0089] Helium detection device 10, helium detection main pipeline 11, helium detection sealing head 12, helium detection cavity 121, leak detector 13, helium detection valve 131, front pump 132, helium detection vacuum pump 14, first branch pipeline 141, helium detection vacuum valve 142, standard leak hole 15, second branch pipeline 151, standard leak valve 152, cavity cleaning pump 16, third branch pipeline 161, cavity cleaning valve 162, nitrogen source 17, fourth branch pipeline 171, nitrogen injection valve 172, fifth branch pipeline 181, first air breaking valve 182, first pressure sensor 19;

[0090] Helium compression device 20, helium compression main line 21, helium compression sealing head 22, helium compression chamber 221, helium source 23, helium compression valve 231, helium injection vacuum pump 24, helium injection vacuum valve 241, helium recovery system 25, helium recovery valve 251, second air-breaking valve 26, second pressure sensor 27;

[0091] Detection platform 30;

[0092] A battery 40 to be tested and a cap 41 . DETAILED DESCRIPTION

[0093] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0094] The present application discloses a helium detection device 10, which is applied to a battery detection system.

[0095] Reference below Figure 1-Figure 5 A helium detection device 10 according to an embodiment of the present application is described.

[0096] In some embodiments, Figure 2 and Figure 3 As shown, the helium detection device 10 comprises: a helium detection main line 11 , a helium detection sealing head 12 , a leak detector 13 , a helium detection vacuum pump 14 and a standard leak hole 15 .

[0097] like Figure 1-Figure 3 As shown, the helium detection sealing head 12 is used to be covered on the outside of the cap 41 of the battery 40 to be detected before helium detection to form a helium detection cavity 121, and the helium detection cavity 121 is connected to the helium detection main line 11; the leak detector 13 can be selectively connected to the helium detection main line 11; the helium detection vacuum pump 14 can be selectively connected to the helium detection main line 11; the standard leak hole 15 can be selectively connected to the helium detection main line 11, and is configured to calibrate the error rate of the helium detection device 10.

[0098] The main helium detection line 11 is a central channel connecting various key components in the helium detection device 10 and is used to transmit helium and other gases. The main helium detection line 11 is usually made of a highly sealed pipe material, such as high-density polyethylene, steel pipe or prestressed steel cylinder concrete pipe.

[0099] like Figure 2 and Figure 3 As shown, the helium detection main line 11 is connected to the helium detection sealing head 12, the leak detector 13, the helium detection vacuum pump 14 and the standard leak hole 15, etc., and selective communication is achieved through various valves and interfaces.

[0100] like Figure 2 and Figure 3 As shown, the helium detection sealing head 12 is a component used to cover the cap 41 of the battery 40 to be detected before detection. The helium detection sealing head 12 can be closely attached to the surface of the battery 40 to be detected to form a relatively closed helium detection cavity 121. The helium detection cavity 121 can accommodate a certain amount of helium, and by detecting the changes in the helium, it is determined whether the cap 41 of the detected battery is leaking, that is, whether the welding quality of the cap 41 is qualified.

[0101] The helium detection sealing head 12 is usually made of elastic material, such as rubber or silicone, to meet the sealing requirements.

[0102] The leak detector 13 can accurately detect and quantify the change in the helium concentration in the helium detection cavity 121. Specifically, the leak detector 13 can obtain the gas sample in the helium detection cavity 121 in real time and analyze and process it by connecting to the helium detection main line 11. The leak detector 13 usually uses high-precision technologies such as mass spectrometers and helium ion detectors to realize the detection function.

[0103] like Figure 2 and Figure 3 As shown, the helium detection vacuum pump 14 is used to evacuate the helium detection chamber 121 and the helium detection main line 11 before calibration and helium detection, so as to achieve a high vacuum state of the detection environment, thereby improving the accuracy of the detection.

[0104] The standard leak 15 is a man-made device with a known constant leak rate. The standard leak 15 is generally composed of a leak element, an air chamber, a leak valve, an air filling valve, and a connector. The standard leak 15 provides a reference point to calibrate the measurement result of the leak detector 13.

[0105] In the related art, in the traditional battery testing system, the helium detection device is only used to detect helium on the cap of the battery to be tested after helium compression, and the helium atomic leakage rate obtained by the helium detection is compared with the standard value. If the helium atomic leakage rate is greater than the standard value, the air tightness of the cap of the battery to be tested is determined to be unqualified. However, the above design ignores the interference of factors such as the air tightness of the helium detection cavity, the air tightness of the helium detection main line, and the complexity of the gas flow path on the test results. In addition, the differences in structure and materials of batteries of different batches and models will also affect the accuracy of the helium detection results. Therefore, the traditional helium detection process lacks customized calibration and compensation mechanisms for specific products, and it is difficult to meet the needs of high-precision and high-stability detection on modern battery production lines.

[0106] It is understandable that if Figure 2 and Figure 3 As shown, since the helium detection device 10 of the present application includes a standard leak hole 15, the standard leak hole 15 forms a closed-loop calibration system with the original detection system by connecting the helium detection main line 11. Before compressing helium, the error rate of the helium detection device 10 is calibrated first. Before calibration, the helium detection sealing head 12 is sealed outside the cap 41 of the battery 40 to be detected to form a helium detection cavity 121. During the calibration process, the standard leak hole 15 can release helium into the helium detection cavity 121 at a constant rate under certain conditions. The standard leak hole 15 can simulate different leakage conditions by adjusting its own leakage rate, so that the leak detector 13 can accurately measure and quantify these leaks, and then observe and record the measurement results of the leak detector 13, so as to calibrate the error rate according to the standard leak rate of the standard leak hole 15 and the measurement results of the leak detector 13. In this way, by introducing the standard leak hole 15 as a calibration component, the error rate of the helium detection device 10 can be conveniently calibrated and calibrated, thereby improving the accuracy and consistency of the final helium detection results.

[0107] The helium detection device 10 provided in the embodiment of the present application realizes comprehensive calibration of the helium detection device 10 and the battery 40 to be detected by adding the standard leak hole 15 on the helium detection main line 11 as mentioned above, and can comprehensively consider the influence of various factors on the helium detection result and accurately compensate the detection result, thereby significantly reducing the error of helium detection and improving the accuracy and reliability of helium detection.

[0108] In some embodiments, Figure 1 and Figure 2 As shown, the helium detection device 10 further includes: a helium detection valve 131 , a first branch pipeline 141 , a helium detection vacuum valve 142 , a second branch pipeline 151 and a leak detection valve 152 .

[0109] The leak detector 13 is connected to the helium detection main line 11 through the helium detection valve 131; the first branch line 141 is connected between the helium detection main line 11 and the helium detection vacuum pump 14, and the helium detection vacuum valve 142 is arranged on the first branch line 141; the second branch line 151 is connected between the helium detection main line 11 and the standard leak hole 15, and the standard leak valve 152 is arranged on the second branch line 151.

[0110] The helium detection valve 131 can be used to control the on-off between the leak detector 13 and the helium detection main line 11. The helium detection valve 131 can be opened when needed to allow the leak detector 13 to detect the gas in the helium detection main line 11 and the helium detection cavity 121; it can be closed when not needed to prevent external gas from interfering with the detection results. The helium detection valve 131 can be designed as a solenoid valve or a pneumatic valve, and the switch state is controlled by the signal sent by the control system.

[0111] The first branch pipeline 141 is a channel connecting the helium detection main pipeline 11 and the helium detection vacuum pump 14. The first branch pipeline 141 is usually made of a pipeline material with high sealing performance and high pressure resistance, such as high-density polyethylene, steel pipe or prestressed steel cylinder concrete pipe.

[0112] The helium detection vacuum valve 142 is used to control the on-off of the first branch pipeline 141. The helium detection vacuum valve 142 can be opened when needed to allow the helium detection vacuum pump 14 to evacuate the helium detection main pipeline 11 and the helium detection cavity 121; it can be closed when not needed to prevent the gas in the helium detection main pipeline 11 and the helium detection cavity 121 from leaking to the outside. The helium detection vacuum valve 142 can be designed as a solenoid valve or a pneumatic valve, and the switch state is controlled by the signal sent by the control system.

[0113] The second branch pipeline 151 is a channel connecting the helium detection main pipeline 11 and the standard leak hole 15. The second branch pipeline 151 is usually made of a pipeline material with high sealing performance and high pressure resistance, such as high-density polyethylene, steel pipe or prestressed steel cylinder concrete pipe.

[0114] The standard leak valve 152 is used to control the on-off of the second branch pipeline 151. The standard leak valve 152 can be opened when needed to allow the standard leak hole 15 to release helium to the helium detection main pipeline 11 and the helium detection cavity 121; it can be closed when not needed to prevent external gas from entering the helium detection main pipeline 11 and the helium detection cavity 121 through the second branch pipeline 151. The standard leak valve 152 can be designed as a solenoid valve or a pneumatic valve, and the switch state is controlled by the signal sent by the control system.

[0115] The helium detection device 10 provided in the embodiment of the present application realizes precise control of the on / off state between the leak detector 13, the helium detection vacuum pump 14, the standard leak hole 15 and the helium detection main pipeline 11 by introducing control valves and branch pipelines such as the helium detection valve 131, the first branch pipeline 141, the helium detection vacuum valve 142, the second branch pipeline 151 and the calibration leak valve 152, thereby realizing precise control of the calibration process and the helium detection process and reducing the interference of external gas on the detection result.

[0116] In some embodiments, Figure 1 and Figure 2 As shown, the helium detection device 10 further includes: a cavity cleaning pump 16 , a pre-pump 132 and a nitrogen source 17 .

[0117] The cavity clearing pump 16 can be selectively connected to the helium detection main line 11 ; the pre-pump 132 can be connected to the leak detector 13 ; and the nitrogen source 17 can be selectively connected to the helium detection main line 11 .

[0118] The cavity cleaning pump 16 is used to remove residual gas in the helium detection main line 11 and the helium detection cavity 121. The cavity cleaning pump 16 usually has a high pumping rate and good sealing performance, so it can effectively pump out the gas in the helium detection main line 11 and the helium detection cavity 121, providing a clean environment for subsequent operations.

[0119] The pre-pump 132 is a device used to increase the inlet pressure of the leak detector 13. Since the leak detector 13 usually has certain requirements for the inlet pressure, and the gas pressure in the helium detection main line 11 and the helium detection cavity 121 may be low, the pre-pump 132 is needed to increase the gas pressure to meet the working requirements of the leak detector 13. Specifically, when the leak detector 13 starts working, the pre-pump 132 will automatically start, suck in the gas in the helium detection main line 11 and the helium detection cavity 121, pressurize it, and send it into the gas chamber of the leak detector 13 for detection.

[0120] The nitrogen source 17 is used to provide nitrogen. During the leak detection process, the nitrogen can be used to purge the helium detection main line 11 and the helium detection chamber 121 to remove residual gas therein.

[0121] The helium detection device 10 provided in the embodiment of the present application can clean out the residual gas and impurities in the helium detection main line 11 and the helium detection cavity 121 through the arrangement of the above-mentioned cavity cleaning pump 16, the pre-pump 132 and the nitrogen source 17, thereby providing a clean and stable environment for subsequent operations; at the same time, the gas pressure is increased by the pre-pump 132, so that the leak detector 13 can accurately detect tiny leakage signals.

[0122] In some embodiments, Figure 1 and Figure 2As shown, the helium detection device 10 further includes: a third branch pipeline 161 , a cavity clearing valve 162 , a fourth branch pipeline 171 and a nitrogen injection valve 172 .

[0123] The third branch pipeline 161 is connected between the helium detection main pipeline 11 and the cavity cleaning pump 16 , and the cavity cleaning valve 162 is arranged on the third branch pipeline 161 ; the fourth branch pipeline 171 is connected between the helium detection main pipeline 11 and the nitrogen source 17 , and the nitrogen injection valve 172 is arranged on the fourth branch pipeline 171 .

[0124] The third branch pipeline 161 is a channel connecting the helium detection main pipeline 11 and the cavity cleaning pump 16. The third branch pipeline 161 is usually made of a pipeline material with high sealing performance and high pressure resistance, such as high-density polyethylene, steel pipe or prestressed steel cylinder concrete pipe.

[0125] The cavity cleaning valve 162 is used to control the on-off of the third branch pipeline 161. The cavity cleaning valve 162 can be opened when needed to allow the gas in the helium detection main pipeline 11 and the helium detection cavity 121 to flow into the cavity cleaning pump 16 for exhaust treatment; it is closed when not needed to prevent gas leakage. The cavity cleaning valve 162 can be designed as a solenoid valve or a pneumatic valve, and the switch state is controlled by the signal sent by the control system.

[0126] The fourth branch pipeline 171 is a channel connecting the helium detection main pipeline 11 and the nitrogen source 17. The fourth branch pipeline 171 is usually made of a pipeline material with high sealing performance and high pressure resistance, such as high-density polyethylene, steel pipe or prestressed steel cylinder concrete pipe.

[0127] The nitrogen injection valve 172 is used to control the on-off of the fourth branch pipeline 171. The nitrogen injection valve 172 can be opened when needed to allow the nitrogen source 17 to inject nitrogen into the helium detection main pipeline 11 and the helium detection cavity 121; it can be closed when not needed to prevent nitrogen leakage. The nitrogen injection valve 172 can be designed as a solenoid valve or a pneumatic valve, and the switch state is controlled by the signal sent by the control system.

[0128] The helium detection device 10 provided in the embodiment of the present application realizes precise control of the on-off state between the cavity clearing pump 16 and the nitrogen source 17 and the helium detection main pipeline 11 by introducing control valves and branch pipelines such as the third branch pipeline 161, the cavity clearing valve 162, the fourth branch pipeline 171 and the nitrogen injection valve 172, thereby realizing precise control of the calibration process and the helium detection process and reducing the interference of external gas on the detection result.

[0129] In some embodiments, Figure 1 and Figure 2 As shown, the helium detection device 10 further includes: a fifth branch pipeline 181 , a first air-breaking valve 182 and a first pressure sensor 19 .

[0130] One end of the fifth branch pipeline 181 is connected to the helium detection main pipeline 11 , and the other end is connected to the external environment. The first air breaker valve 182 is provided on the fifth branch pipeline 181 ; the first pressure sensor 19 is used to detect the gas pressure in the helium detection main pipeline 11 .

[0131] The fifth branch pipeline 181 is a dedicated pipeline connected between the helium detection main pipeline 11 and the external environment. The fifth branch pipeline 181 allows the gas in the helium detection main pipeline 11 to be discharged to the external environment when necessary to perform pressure regulation, gas replacement and other operations.

[0132] The first air-breaking valve 182 is used to control the on-off of the fifth branch pipeline 181. When it is necessary to discharge the gas in the helium detection chamber 121 and the helium detection main pipeline 11, the first air-breaking valve 182 is opened to allow the gas to be smoothly discharged to the external environment; when it is not necessary to discharge the gas, the first air-breaking valve 182 is closed to prevent gas leakage. The first air-breaking valve 182 can be designed as a solenoid valve or a pneumatic valve, and the switch state is controlled by the signal sent by the control system.

[0133] The first pressure sensor 19 can be used to detect the gas pressure in the helium detection cavity 121 and the helium detection main line 11. The first pressure sensor 19 can monitor the gas pressure changes in the helium detection cavity 121 and the helium detection main line 11 in real time, and convert the pressure signal into an electrical signal for transmission and processing. The first pressure sensor 19 is usually installed at an appropriate position of the helium detection main line 11, connected through a branch pipe or directly installed on the helium detection main line 11.

[0134] The helium detection device 10 provided in the embodiment of the present application can adjust the gas pressure in the helium detection main line 11 as needed by introducing the fifth branch pipeline 181 and the first air-breaking valve 182. During the detection process, if the gas pressure in the helium detection main line 11 is too high, the first air-breaking valve 182 can be opened to discharge excess gas into the external environment, thereby alleviating damage or safety hazards to the helium detection device 10 caused by excessive pressure, and by real-time monitoring of the output signal of the first pressure sensor 19, the changes in the gas pressure in the helium detection cavity 121 and the helium detection main line 11 can be understood, thereby more accurately judging whether there are leakages and other problems during the detection process.

[0135] The present application also provides a battery detection system.

[0136] In some embodiments, Figure 1 As shown, the battery detection system includes: a detection platform 30, a conveying device, a helium compression device 20 and a helium detection device 10 as any one of the above.

[0137] The detection platform 30 has a detection position for placing the battery 40 to be detected; the conveying device is used to convey the battery 40 to be detected to the detection position; the helium compression device 20 is installed on the detection platform 30, and is used to compress helium on the cap 41 of the battery 40 to be detected; the helium detection device 10 is installed on the detection platform 30, and is used to detect helium on the cap 41 of the battery 40 to be detected after helium compression.

[0138] like Figure 1 As shown, the testing platform 30 is a core component of the battery testing system, and the testing platform 30 provides a stable and accurate testing environment for the battery to be tested 40. The testing platform 30 has a specially designed testing position, which is used to place the battery to be tested. The testing position is usually equipped with a positioning device and a fixing device to maintain the stability and accuracy of the battery to be tested 40 during the testing process.

[0139] Exemplarily, the testing position may be designed in the form of a mechanical or pneumatic clamp, which can firmly clamp the battery 40 to be tested.

[0140] The conveyor is responsible for conveying the batteries to be inspected from the storage or pre-processing area to the inspection position of the inspection platform 30. The conveyor is usually highly automated and flexible, can adapt to batteries of different sizes and weights, and can complete the conveying task in a short time.

[0141] The conveying device may include but is not limited to a robotic arm, a conveyor belt or a roller conveying system, etc., which is not limited here.

[0142] For example, in some embodiments, the transport device is a robotic arm.

[0143] In actual implementation, Figure 1 As shown, in the battery testing system, each structure realizes an efficient testing process through precise coordination and control. The conveying device conveys the battery 40 to be tested to the testing position of the testing platform 30, and then the helium detection device 10 cooperates with the cap 41 of the battery 40 to be tested to complete the calibration process, and then the helium compression device 20 compresses the cap 41 of the battery 40 to be tested with helium. After the helium compression is completed, the helium detection device 10 performs helium detection on the battery cap 41. The entire testing process can be precisely controlled and monitored by the control system.

[0144] The battery detection system provided in the embodiment of the present application realizes a comprehensive calibration of the helium detection device 10 and the battery 40 to be detected through the setting of the above-mentioned helium detection device 10, can comprehensively consider the influence of various factors on the helium detection results, and accurately compensate for the detection results, thereby significantly reducing the error of helium detection and improving the accuracy and reliability of helium detection.

[0145] In some embodiments, Figure 4 and Figure 5As shown, the helium compression device 20 includes: a helium compression main line 21, a helium compression sealing head 22, a helium source 23, a helium compression valve 231, a helium injection vacuum pump 24, a helium injection vacuum valve 241, a helium recovery system 25, a helium recovery valve 251, a second air-breaking valve 26 and a second pressure sensor 27.

[0146] The helium pressure sealing head 22 is used to be covered outside the cap 41 of the battery 40 to be tested before helium pressure is applied to form a helium pressure cavity 221, and the helium pressure cavity 221 is connected to the helium pressure main line 21; the helium source 23 is connected to the helium pressure main line 21 through the helium pressure valve 231; the helium injection vacuum pump 24 is connected to the helium pressure main line 21 through the helium injection vacuum valve 241; the helium recovery system 25 is connected to the helium pressure main line 21 through the helium recovery valve 251; the helium pressure main line 21 is connected to the external environment through the second air-breaking valve 26; the second pressure sensor 27 is used to detect the gas pressure in the helium pressure main line 21.

[0147] The helium compression main line 21 is a central channel connecting various key components in the helium compression device 20, and is used to transmit helium and other gases. The helium compression main line 21 is usually made of a highly sealed pipe material, such as high-density polyethylene, steel pipe or prestressed steel cylinder concrete pipe.

[0148] like Figure 4 and Figure 5 As shown, the helium pressure sealing head 22 is a component used to cover the outside of the cap 41 of the battery 40 to be tested before helium pressure is applied. The helium pressure sealing head 22 can fit tightly with the surface of the battery 40 to be tested to form a relatively closed helium pressure cavity 221.

[0149] The helium pressure sealing head 22 is usually made of elastic material, such as rubber or silicone, to meet the sealing requirements.

[0150] The helium source 23 is a device for providing helium, and generally includes a high-pressure gas cylinder or a helium generator, etc. The helium source 23 is connected to the helium compression main line 21 through a branch pipeline and a helium compression valve 231 , and the flow and pressure of the helium are adjusted by controlling the opening of the helium compression valve 231 .

[0151] The helium pressure valve 231 can be designed as a solenoid valve or a pneumatic valve, and the switch state is controlled by a signal sent by a control system.

[0152] The helium injection vacuum pump 24 is used to evacuate the helium compression chamber 221 and the helium compression main line 21 before injecting helium gas, so as to remove air and other impurities in the helium compression chamber 221 and the helium compression main line 21. The helium injection vacuum pump 24 is connected to the helium compression main line 21 through a branch pipe and a helium injection vacuum valve 241, and the vacuum operation is realized by controlling the opening and closing of the helium injection vacuum valve 241.

[0153] The helium injection vacuum valve 241 can be designed as a solenoid valve or a pneumatic valve, and the switch state is controlled by a signal sent by a control system.

[0154] The helium recovery system 25 is used to recover the unused helium in the helium compression process to reduce resource waste and environmental pollution. The recovery system may include but is not limited to components such as filters, compressors, and gas storage tanks. The helium recovery system 25 is connected to the helium compression main line 21 through a pipeline and a helium recovery valve 251, and the helium recovery is achieved by controlling the opening and closing of the helium recovery valve 251.

[0155] The helium recovery valve 251 can be designed as a solenoid valve or a pneumatic valve, and the switch state is controlled by a signal sent by a control system.

[0156] The second air-breaking valve 26 is used to control the on-off between the helium pressure main line 21 and the external environment. When it is necessary to discharge the gas in the helium pressure chamber 221 and the helium pressure main line 21, the second air-breaking valve 26 is opened to allow the gas to be smoothly discharged to the external environment; when it is not necessary to discharge the gas, the second air-breaking valve 26 is closed to prevent gas leakage. The second air-breaking valve 26 can be designed as a solenoid valve or a pneumatic valve, and the switch state is controlled by the signal sent by the control system.

[0157] The second pressure sensor 27 can be used to detect the gas pressure in the helium compression chamber 221 and the helium compression main line 21. The second pressure sensor 27 can monitor the gas pressure changes in the helium compression chamber 221 and the helium compression main line 21 in real time, and convert the pressure signal into an electrical signal for transmission and processing. The second pressure sensor 27 is usually installed at an appropriate position of the helium compression main line 21, connected through a branch pipe or directly installed on the helium compression main line 21.

[0158] The battery detection system provided in the embodiment of the present application provides structural support for the operation of the entire helium compression process through the arrangement of the above-mentioned helium compression main line 21, helium compression sealing head 22, helium source 23, helium compression valve 231, helium injection vacuum pump 24, helium injection vacuum valve 241, helium recovery system 25, helium recovery valve 251, second air-breaking valve 26 and second pressure sensor 27. The helium compression device 20 can accurately control the injection, recovery and pressure regulation of helium, improve the stability and repeatability of the helium compression process, and at the same time, the use of the helium recovery system 25 can improve the utilization rate of helium, reduce resource waste, and reduce detection costs.

[0159] In some embodiments, Figure 1 As shown, the detection platform 30 includes multiple detection areas, each of which is equipped with a helium compression device 20 and a helium detection device 10. Each detection area has multiple detection positions. The helium compression device 20 and the helium detection device 10 are configured to compress and detect helium on multiple batteries 40 to be detected placed in multiple detection positions.

[0160] Here, multiple means two or more.

[0161] For example, Figure 1 As shown, the detection platform 30 includes detection area 1, detection area 2, detection area 3 and detection area 4, and each of the detection area 1, detection area 2, detection area 3 and detection area 4 has four detection positions.

[0162] In actual implementation, Figure 1 As shown, the detection platform 30 is divided into a plurality of detection areas, each area can independently perform helium compression and helium detection operations of the battery. In other words, each detection area is equipped with a set of helium compression devices 20 and helium detection devices 10, each detection area can perform a separate helium detection, and a single battery 40 to be detected in each detection area can also be subjected to a separate helium detection. Specifically, the helium compression device 20 may include a plurality of helium compression sealing heads 22, and the plurality of helium compression sealing heads 22 may simultaneously seal a plurality of batteries 40 to be detected in the corresponding detection area; the helium detection device 10 may include a plurality of helium detection sealing heads 12, and the plurality of helium detection sealing heads 12 may simultaneously seal a plurality of batteries 40 to be detected in the corresponding detection area.

[0163] The battery detection system provided in the embodiment of the present application realizes simultaneous detection of multiple batteries 40 to be detected in each detection area and independent detection of a single battery 40 to be detected through the structural design of integrating multiple detection areas, the helium compression device 20 and the helium detection device 10, thereby improving the efficiency and accuracy of detection, not only meeting the needs of large-scale production, but also improving the detection quality by accurately controlling the helium compression and helium detection processes. In addition, the modular design also makes the detection platform 30 have good flexibility and scalability, and can adapt to battery detection needs of different types and scales.

[0164] The present application also provides a helium detection method, which is applied to any of the battery detection systems described above.

[0165] Reference below Figure 6-Figure 9 A helium detection method according to an embodiment of the present application is described.

[0166] In some embodiments, Figure 6 As shown, the helium detection method includes: step 110, step 120, step 130, step 140, step 150, step 160, step 170, step 180 and step 190.

[0167] Reference Figure 7-Figure 9 As shown, the helium detection method can be divided into three processes: calibration, helium compression and helium detection. Figure 7 The schematic diagram of the calibration process is shown in Figure 2. Figure 8 This is a schematic diagram of the helium compression process. Fig. 9The figure is a schematic diagram of the helium detection process. Step 110, step 120, step 130, step 140 and step 150 belong to the calibration process, step 160 belongs to the helium compression process, and step 170, step 180 and step 190 belong to the helium detection process.

[0168] Step 110 , after the battery 40 to be tested reaches the testing position and is fixed, the helium testing sealing head 12 is controlled to seal the cap 41 of the battery 40 to be tested to form a helium testing cavity 121 .

[0169] In this step, the battery 40 to be tested is placed on the testing position of the testing platform 30 and is stabilized by the positioning device and the fixing device. Subsequently, the control system controls the helium detection sealing head 12 to fit tightly on the outer surface of the battery 40 to be tested, forming a closed helium detection cavity 121 that is covered outside the cap 41 of the battery 40 to be tested.

[0170] Step 120 , control the helium detection vacuum pump 14 to evacuate the helium detection main line 11 and the helium detection chamber 121 .

[0171] After the helium detection sealing head 12 forms the helium detection cavity 121 , the control system opens the helium detection vacuum valve 142 and controls the helium detection vacuum pump 14 to start, thereby evacuating the helium detection main pipeline 11 and the helium detection cavity 121 through the first branch pipeline 141 .

[0172] like Figure 7 As shown, after the helium detection vacuum valve 142 is opened to evacuate the air, the evacuation time of the helium detection vacuum pump 14 is controlled within the specified time. If the pressure value detected by the first pressure sensor 19 reaches the specified air pressure value within the specified time, the helium detection process proceeds normally and enters step 130; if the pressure value detected by the first pressure sensor 19 does not reach the specified air pressure value within the specified time, it is determined that the helium detection process fails, and the battery 40 to be detected is discharged.

[0173] Step 130 , after evacuation, control the leak detector 13 and the standard leak hole 15 to be connected with the helium detection main line 11 .

[0174] like Figure 7 As shown, after the vacuuming is completed, the control system closes the helium detection vacuum valve 142 and opens the leak detection valve and the standard leak valve 152 to achieve communication between the leak detector 13 and the standard leak hole 15 and the helium detection main line 11.

[0175] Step 140 , obtaining the standard leak rate of the standard leak hole 15 and the calibrated measurement leak rate of the leak detector 13 .

[0176] The standard leak rate is indicated on the nameplate of the standard leak hole 15 and can be input into the control system in advance for data storage. After opening the leak detection valve and the standard leak valve 152, the control system obtains the reading of the leak detector 13 within a specified time, that is, calibrates the measured leak rate.

[0177] Step 150: Obtain the error rate of the helium detection device 10 based on the calibrated measured leak rate and the standard leak rate.

[0178] By comparing the standard leak rate with the calibration measurement leak rate, the control system can calculate the error rate. This error rate will be used to correct the measurement results of the leak detector 13 in the future to improve the accuracy of the detection.

[0179] Step 160 , controlling the helium pressing device 20 to pressurize the cap 41 of the battery 40 to be tested with helium.

[0180] After the calibration process is completed, the control system controls the helium detection device 10 to separate from the battery to be detected 40, and controls the helium compression device 20 to perform helium compression operation on the cap 41 of the battery to be detected 40. In the entire helium compression process, the aforementioned helium compression main line 21, helium compression sealing head 22, helium source 23, helium compression valve 231, helium injection vacuum pump 24, helium injection vacuum valve 241, helium recovery system 25, helium recovery valve 251, second air-breaking valve 26 and second pressure sensor 27 work together.

[0181] Step 170 , controlling the helium detection device 10 to perform helium detection on the cap 41 of the battery 40 to be detected after helium compression to obtain the helium detection leakage rate of the leak detector 13 .

[0182] After the helium compression process is completed, the control system controls the helium compression device 20 to separate from the battery to be detected 40, and controls the helium detection device 10 to perform helium detection on the cap 41 of the battery to be detected 40 to obtain the helium detection leakage rate. In the entire helium detection process, the aforementioned helium detection main line 11, helium detection sealing head 12, leak detector 13, helium detection valve 131, front pump 132, helium detection vacuum pump 14, helium detection vacuum valve 142, standard leak hole 15, standard leak valve 152, cavity cleaning pump 16, cavity cleaning valve 162, nitrogen source 17, nitrogen injection valve 172, first air breaking valve 182 and first pressure sensor 19 work together.

[0183] Step 180: Obtain the actual helium detection leak rate based on the helium detection leak rate and the error rate.

[0184] After obtaining the helium detection leakage rate, the control system corrects the helium detection leakage rate according to the previously calculated error rate to obtain the actual helium detection leakage rate. This actual helium detection leakage rate will be used to subsequently determine whether the airtightness of the cap 41 of the battery 40 to be tested is qualified.

[0185] Step 190: Based on the actual helium leak rate and the standard leak rate, determine whether the airtightness of the cap 41 of the battery 40 to be tested is qualified.

[0186] Finally, the control system compares the actual helium leak rate with the preset standard leak rate, and determines whether the air tightness of the cap 41 of the battery 40 to be tested is qualified according to the comparison result.

[0187] It should be noted that, in some embodiments, after each battery 40 to be inspected arrives at the corresponding inspection area, it can be inspected for helium in the order of calibration-helium compression-helium inspection. Alternatively, in other embodiments, in order to speed up the production line rhythm, the calibration process is only performed once within a cycle for a single inspection area. In other words, within the cycle, the helium detection leakage rates of all batteries 40 to be inspected that undergo helium inspection in the inspection area are corrected with the same error rate. Specifically, the timing of recalibration may include but is not limited to after changing the battery model, after replacing the pipeline, after the qualified battery is put into inspection and the result is unqualified, and after the unqualified battery is put into inspection and the result is qualified. The specific time can be flexibly used according to the actual situation. In addition, the error rate of each battery 40 to be inspected in each area is independent, so Figure 1 Taking the detection area 1 in the example, since the helium detection sealing heads 12 and pipelines corresponding to the four batteries 40 to be detected are independent, the calibration results of the four batteries 40 to be detected in the detection area 1 are also independent.

[0188] The helium detection method provided in the embodiment of the present application realizes a comprehensive calibration of the helium detection device 10 and the battery 40 to be detected by introducing the calibration process before the helium compression process. It can comprehensively consider the influence of various factors on the helium detection results and accurately compensate for the detection results, thereby significantly reducing the error of the helium detection and improving the accuracy and reliability of the helium detection.

[0189] In some embodiments, step 190, determining whether the air tightness of the cap 41 of the battery 40 to be tested is qualified based on the actual helium leak rate and the standard leak rate, includes:

[0190] Compare the actual helium leak rate with the standard leak rate;

[0191] When the comparison result shows that the difference between the actual helium leak rate and the standard leak rate is within the preset range, it is determined that the air tightness of the cap 41 of the battery 40 to be tested is qualified;

[0192] When the comparison result shows that the difference between the actual helium leak rate and the standard leak rate exceeds the preset range, it is determined that the airtightness of the cap 41 of the battery 40 to be tested is unqualified.

[0193] In actual implementation, before making a comparison, a preset range needs to be set. This preset range is usually determined based on the airtightness requirements of the cap 41, the accuracy of the battery detection system, and the experience in actual production. The size of the preset range directly affects the strictness of the judgment result. The control system compares the actual helium leak rate with the standard leak rate and calculates the difference between the actual helium leak rate and the standard leak rate. According to the comparison results, the control system makes the following two judgments: If the difference between the actual helium leak rate and the standard leak rate is within the preset range, it means that the airtightness of the cap 41 of the battery 40 to be tested meets the requirements, so it is determined that its airtightness is qualified; if the difference between the actual helium leak rate and the standard leak rate exceeds the preset range, it means that the cap 41 of the battery 40 to be tested has a leakage problem, so it is determined that its airtightness is unqualified. Finally, the control system can record the judgment results and feedback them to the relevant operators or systems. For unqualified batteries, further analysis and processing may be required.

[0194] The helium detection method provided in the embodiment of the present application can more accurately determine whether the airtightness of the cap 41 of the battery 40 to be tested is qualified by setting the preset range and performing precise comparison. This judgment method avoids the subjectivity and uncertainty of human judgment, improves the accuracy and reliability of the detection, and the setting of the preset range can be adjusted according to different battery cap 41 types, production requirements and the accuracy of the battery detection system, which enables the battery detection system to adapt to different application scenarios and needs, and improves the flexibility and applicability of the battery detection system.

[0195] In some embodiments, step 150, based on the calibrated measured leak rate and the standard leak rate, the error rate of the helium detection device 10 is obtained, including: error rate = standard leak rate / calibrated measured leak rate; and step 180, based on the helium detection leak rate and the error rate, the actual helium detection leak rate is obtained, including: actual helium detection leak rate = helium detection leak rate × error rate.

[0196] In step 140, the control system has obtained the standard leak rate and the calibrated measured leak rate. According to the formula "error rate = standard leak rate / calibrated measured leak rate", the standard leak rate and the calibrated measured leak rate are substituted into the formula to calculate the error rate. Note that the error rate calculation here is actually a ratio, and the error rate reflects the degree of deviation between the measured value of the leak detector 13 and the true value. The calculated error rate is recorded and stored in the control system for subsequent use.

[0197] In step 170, the control system has acquired the helium detection leak rate. And the error rate calculated in step 150 has also been stored in the control system. According to the formula "actual helium detection leak rate = helium detection leak rate × error rate", the helium detection leak rate and the error rate are substituted into the formula to calculate the actual helium detection leak rate. This calculation process is actually to correct the helium detection leak rate to obtain a helium detection actual leak rate that is closer to the true value. The calculated helium detection actual leak rate is recorded and compared with the preset standard leak rate to determine whether the airtightness of the cap 41 of the battery 40 to be tested is qualified.

[0198] The helium detection method provided in the embodiment of the present application can obtain an actual helium detection leak rate that is closer to the true value by calculating the error rate and correcting the helium detection leak rate, thereby improving the accuracy of the detection. The calculation and use of the error rate enables the battery detection system to automatically correct the measurement error, thereby enhancing the reliability and stability of the battery detection system. At the same time, the calculation of the error rate is based on the standard leak hole 15 and the calibrated measurement leak rate, so it can adapt to leak detectors 13 of different models and specifications and different types of battery caps 41 detection, and by recording the error rate and the actual leak rate, deviations and problems in the battery detection system can be discovered in time, and adjustments and optimizations can be made, thereby maintaining the consistency and stability of the detection quality. In addition, the calculation of the error rate and the correction of the actual leak rate can be completed automatically, reducing manual intervention and errors, and improving production efficiency.

[0199] In some embodiments, Figure 7 As shown, after obtaining the standard leak rate of the standard leak hole 15 and the calibrated measurement leak rate of the leak detector 13 in step 140, the following further includes:

[0200] Control the nitrogen source 17 to be connected to the helium detection main line 11, and inject nitrogen into the helium detection main line 11 and the helium detection cavity 121 for purging;

[0201] After purging, the cavity cleaning pump 16 is controlled to communicate with the helium detection main line 11 to clean the helium detection main line 11 and the helium detection cavity 121;

[0202] After the cavity is cleared, the helium detection main line 11 is controlled to be connected to the external environment, and the vacuum of the helium detection main line 11 and the helium detection cavity 121 is broken;

[0203] The helium detection sealing head 12 is controlled to be out of contact with the battery 40 to be detected.

[0204] It should be noted that the above steps in this embodiment all belong to the calibration process.

[0205] In actual implementation, Figure 7As shown, after obtaining the standard leak rate and calibrating the measured leak rate, the control system can control the nitrogen injection valve 172 to open, and the nitrogen source 17 injects nitrogen into the helium detection main pipeline 11 and the helium detection chamber 121 through the fourth branch pipeline 171 for purging, and the purging time is controlled within the specified time. If the pressure value detected by the first pressure sensor 19 reaches the specified air pressure value within the specified time, the helium detection process proceeds normally and the nitrogen injection valve 172 is closed; if the pressure value detected by the first pressure sensor 19 does not reach the specified air pressure value within the specified time, it is determined that the helium detection process fails, and the battery 40 to be detected is discharged. After the purging is completed, the control system can control the cavity cleaning valve 162 to open, and the cavity cleaning pump 16 clears the helium detection main pipeline 11 and the helium detection cavity 121 through the third branch pipeline 161, and controls the cavity cleaning time within the specified time. If the pressure value detected by the first pressure sensor 19 reaches the specified air pressure value within the specified time, the helium detection process proceeds normally and the cavity cleaning valve 162 is closed; if the pressure value detected by the first pressure sensor 19 does not reach the specified air pressure value within the specified time, it is determined that the helium detection process has failed, and the battery 40 to be detected is discharged. After the cavity is cleared, the control system can control the first air-breaking valve 182 to open, and the helium detection main line 11 and the helium detection cavity 121 exchange gas with the external environment through the fifth branch line 181 to realize the vacuum breaking of the helium detection main line 11 and the helium detection cavity 121, and control the vacuum breaking time within the specified time. If the pressure value detected by the first pressure sensor 19 reaches the atmospheric pressure value within the specified time, the first air-breaking valve 182 is closed, and then the helium detection sealing head 12 is separated from the cap 41 of the battery 40 to be detected; if the pressure value detected by the first pressure sensor 19 does not reach the atmospheric pressure value within the specified time, it is determined that the helium detection process has failed, and the battery 40 to be detected is discharged.

[0206] It should be noted that the prescribed time and prescribed air pressure for the above stages are not exactly the same and need to be set individually according to the actual conditions of each stage, and are not limited here.

[0207] The helium detection method provided in the embodiment of the present application can effectively remove the residual gas and impurities, especially the possible helium, in the helium detection main line 11 and the helium detection cavity 121 by adding the steps of purging, clearing the cavity and breaking the vacuum in the above calibration process, thereby reducing the interference caused to the subsequent helium compression and helium detection process and improving the accuracy of leak detection. At the same time, it helps to reduce the scrap rate, improve production efficiency and reduce production costs.

[0208] In some embodiments, Fig. 9 As shown, the helium detection leakage rate includes: the maximum measurement value of the leak detector 13 within the target time period and the measurement value at the end time.

[0209] It is understandable that the target duration is usually determined according to the type and size of the battery 40 to be detected and the performance of the leak detector 13. During the target duration, the leak detector 13 will continuously measure and record the leakage rate of helium.

[0210] Specifically, the target duration may be 2.5s to 3.5s.

[0211] Exemplarily, the target time length may be 3 seconds. In other words, the maximum measurement value of the leak detector 13 within 3 seconds and the measurement value at the 3rd second are obtained.

[0212] The helium detection method provided in the embodiment of the present application allows dynamic analysis of the leakage process by recording the maximum measurement value within the target time length and the measurement value at the end time, which helps to identify possible instantaneous leakage or the changing trend of the leakage rate, and can more comprehensively understand the leakage situation during the leak detection process, thereby helping to improve the accuracy and reliability of the helium detection results.

[0213] In some embodiments, Figure 8 As shown, step 160, controlling the helium pressing device 20 to pressurize the cap 41 of the battery 40 to be tested, includes:

[0214] Controlling the helium pressure sealing head 22 to seal the cap 41 of the battery 40 to be tested to form a helium pressure cavity 221;

[0215] Controlling the helium pressure vacuum pump to evacuate the helium pressure main line 21 and the helium pressure cavity 221;

[0216] After evacuation, the helium source 23 is controlled to be connected with the helium pressure main line 21, and helium is injected into the helium pressure main line 21 and the helium pressure cavity 221 to maintain the pressure;

[0217] After the pressure maintenance is completed, the helium recovery system 25 is controlled to be connected with the helium compression main line 21 to recover the helium in the helium compression main line 21 and the helium compression cavity 221;

[0218] After recovery, the helium compression main line 21 is controlled to be connected to the external environment, and the helium compression main line 21 and the helium compression chamber 221 are vacuum-broken;

[0219] The helium pressure sealing head 22 is controlled to be out of contact with the battery 40 to be tested.

[0220] In actual implementation, Figure 8As shown, after the calibration process is completed, the helium compression process begins, and the control system controls the helium compression sealing head 22 to fit tightly on the outer surface of the battery 40 to be tested, forming a closed helium compression cavity 221 that is covered outside the cap 41 of the battery 40 to be tested. After the helium compression sealing head 22 forms the helium compression cavity 221, the control system opens the helium compression vacuum valve, controls the helium compression vacuum pump to start vacuuming the helium compression main line 21 and the helium compression cavity 221, and controls the vacuuming time of the helium compression vacuum pump to be within the specified time. If the pressure value detected by the second pressure sensor 27 reaches the specified air pressure value within the specified time, the helium inspection process proceeds normally and the helium compression vacuum valve is closed; if the pressure value detected by the second pressure sensor 27 does not reach the specified air pressure value within the specified time, it is determined that the helium inspection process fails, and the battery 40 to be tested is discharged. After the vacuuming is completed, the control system opens the helium pressure valve 231, controls the helium source 23 to inject a certain amount of helium into the helium pressure main line 21 and the helium pressure cavity 221, closes the helium pressure valve 231 and maintains the pressure, controls the time of injecting helium to be within the specified time, and if the pressure value detected by the second pressure sensor 27 does not exceed the specified range within the specified time, the helium detection process is carried out normally; if the pressure value detected by the second pressure sensor 27 exceeds the specified range within the specified time, it is determined that the helium detection process fails, and the battery 40 to be detected is discharged. After the pressure maintenance is completed, the control system opens the helium recovery valve 251, controls the helium recovery system 25 to recover the helium in the helium pressure main line 21 and the helium pressure cavity 221, and closes the helium recovery valve 251 after the recovery timing ends. After the recovery is completed, the control system opens the second air-breaking valve 26, and the helium pressure main line 21 and the helium pressure chamber 221 exchange gases with the external environment to achieve vacuum breaking of the helium pressure main line 21 and the helium pressure chamber 221, and controls the vacuum breaking time within the specified time. If the pressure value detected by the second pressure sensor 27 reaches the atmospheric pressure value within the specified time, the second air-breaking valve 26 is closed, and then the helium pressure sealing head 22 is separated from the cap 41 of the battery 40 to be tested; if the pressure value detected by the second pressure sensor 27 does not reach the atmospheric pressure value within the specified time, it is determined that the helium detection process has failed, and the battery 40 to be tested is discharged for waste treatment.

[0221] It should be noted that the prescribed time and prescribed air pressure for the above stages are not exactly the same and need to be set individually according to the actual conditions of each stage, and are not limited here.

[0222] The helium detection method provided in the embodiment of the present application can improve the accuracy and reliability of the helium detection results by accurately controlling each step in the helium compression process through the control logic design of the above-mentioned helium compression process. At the same time, the use of the helium recovery system 25 can improve the utilization rate of helium, reduce resource waste, and reduce detection costs. In addition, the design allows helium compression operations to be performed on different batteries 40 to be detected, and only relevant parameters need to be adjusted to adapt to different detection requirements, thereby enhancing the flexibility and versatility of the battery detection system.

[0223] In some embodiments, Fig. 9 As shown, step 170, controlling the helium detection device 10 to detect helium on the cap 41 of the battery 40 to be detected after helium compression to obtain the helium detection leakage rate of the leak detector 13, includes:

[0224] Controlling the helium detection sealing head 12 to seal the cap 41 of the battery 40 to be detected to form a helium detection cavity 121;

[0225] Control the helium detection vacuum pump 14 to evacuate the helium detection main line 11 and the helium detection cavity 121;

[0226] After evacuation, the control leak detector 13 is connected to the helium detection main line 11;

[0227] Obtaining the helium detection leakage rate of the leak detector 13;

[0228] Control the nitrogen source 17 to be connected to the helium detection main line 11, and inject nitrogen into the helium detection main line 11 and the helium detection cavity 121 for purging;

[0229] After purging, the cavity cleaning pump 16 is controlled to communicate with the helium detection main line 11 to clean the helium detection main line 11 and the helium detection cavity 121;

[0230] After the cavity is cleared, the helium detection main line 11 is controlled to be connected to the external environment, and the vacuum of the helium detection main line 11 and the helium detection cavity 121 is broken;

[0231] The helium detection sealing head 12 is controlled to be out of contact with the battery 40 to be detected.

[0232] In actual implementation, Fig. 9As shown, after the helium compression process is completed, the helium detection process begins, and the control system controls the helium detection sealing head 12 to fit tightly on the outer surface of the battery 40 to be detected, forming a closed helium detection cavity 121 that is covered outside the cap 41 of the battery 40 to be detected. After the helium detection sealing head 12 forms the helium detection cavity 121, the control system controls the helium detection vacuum valve 142 to open, controls the helium detection vacuum pump 14 to start vacuuming the helium detection main line 11 and the helium detection cavity 121, and controls the vacuuming time of the helium detection vacuum pump 14 to be within the specified time. If the pressure value detected by the first pressure sensor 19 reaches the specified air pressure value within the specified time, the helium detection process proceeds normally and the helium detection vacuum valve 142 is closed; if the pressure value detected by the first pressure sensor 19 does not reach the specified air pressure value within the specified time, it is determined that the helium detection process fails, and the battery 40 to be detected is discharged. After the vacuuming is completed, the control system opens the leak detection valve, then obtains the maximum measurement value of the leak detector 13 within the target time and the measurement value at the end time, and then closes the leak detection valve. The specific data processing process has been detailed above and will not be repeated here. After the leak detection is completed, the control system controls the nitrogen injection valve 172 to open, and the nitrogen source 17 injects nitrogen into the helium detection main line 11 and the helium detection cavity 121 through the fourth branch pipeline 171 for purging. The purging time is controlled within the specified time. If the pressure value detected by the first pressure sensor 19 reaches the specified air pressure value within the specified time, the helium detection process proceeds normally and the nitrogen injection valve 172 is closed; if the pressure value detected by the first pressure sensor 19 does not reach the specified air pressure value within the specified time, it is determined that the helium detection process has failed, and the battery 40 to be detected is discharged. After the purging is completed, the control system can control the cavity cleaning valve 162 to open, and the cavity cleaning pump 16 clears the helium detection main pipeline 11 and the helium detection cavity 121 through the third branch pipeline 161, and controls the cavity cleaning time within the specified time. If the pressure value detected by the first pressure sensor 19 reaches the specified air pressure value within the specified time, the helium detection process proceeds normally and the cavity cleaning valve 162 is closed; if the pressure value detected by the first pressure sensor 19 does not reach the specified air pressure value within the specified time, it is determined that the helium detection process has failed, and the battery 40 to be detected is discharged. After the cavity is cleared, the control system can control the first air-breaking valve 182 to open, and the helium detection main line 11 and the helium detection cavity 121 exchange gas with the external environment through the fifth branch line 181 to realize the vacuum breaking of the helium detection main line 11 and the helium detection cavity 121, and control the vacuum breaking time within the specified time. If the pressure value detected by the first pressure sensor 19 reaches the atmospheric pressure value within the specified time, the first air-breaking valve 182 is closed, and then the helium detection sealing head 12 is separated from the cap 41 of the battery 40 to be detected; if the pressure value detected by the first pressure sensor 19 does not reach the atmospheric pressure value within the specified time, it is determined that the helium detection process has failed, and the battery 40 to be detected is discharged.

[0233] It should be noted that the prescribed time and prescribed air pressure for the above stages are not exactly the same and need to be set individually according to the actual conditions of each stage, and are not limited here.

[0234] The helium detection method provided in the embodiment of the present application can improve the accuracy and reliability of the helium detection results by accurately controlling each step in the helium detection process through the control logic design of the above-mentioned helium detection process. At the same time, the purging and cavity clearing steps help to remove residual gas in the helium detection device 10, thereby minimizing cross contamination between different batteries. In addition, the design allows helium detection operations to be performed on different batteries 40 to be detected, and only relevant parameters need to be adjusted to adapt to different detection requirements, thereby enhancing the flexibility and versatility of the battery detection system.

[0235] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0236] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0237] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0238] In the description of the present application, “plurality” means two or more.

[0239] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0240] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0241] Other structures of ... according to the embodiments of the present application, such as ... and ..., and operations are known to ordinary technicians in the field and will not be described in detail here.

[0242] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0243] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A helium detection device, applied to a battery detection system, characterized in that: include: Helium main inspection line; A helium detection sealing head, which is used to be covered outside the cap of the battery to be detected before helium detection to form a helium detection cavity, and the helium detection cavity is connected to the helium detection main line; A leak detector, the leak detector being selectively connectable to the helium detection main line; A helium detection vacuum pump, which can be selectively connected to the helium detection main line; A standard leak hole, which can be selectively connected to the helium detection main line, is configured to calibrate the error rate of the helium detection device.

2. The helium detection device according to claim 1, characterized in that: Also includes: A helium detection valve, through which the leak detector is connected to the helium detection main line; A first branch pipeline and a helium detection vacuum valve, wherein the first branch pipeline is connected between the helium detection main pipeline and the helium detection vacuum pump, and the helium detection vacuum valve is arranged on the first branch pipeline; A second branch pipeline and a standard leak valve, wherein the second branch pipeline is connected between the helium detection main pipeline and the standard leak hole, and the standard leak valve is arranged on the second branch pipeline.

3. The helium detection device according to claim 1 or 2, characterized in that: Also includes: a cavity cleaning pump, the cavity cleaning pump being selectively connectable to the helium detection main line; A pre-pump, the pre-pump being connected to the leak detector; A nitrogen source is selectively connectable to the helium detection main line.

4. The helium detection device according to claim 3, characterized in that: Also includes: A third branch pipeline and a cavity clearing valve, wherein the third branch pipeline is connected between the helium detection main pipeline and the cavity clearing pump, and the cavity clearing valve is arranged on the third branch pipeline; A fourth branch pipeline and a nitrogen injection valve, wherein the fourth branch pipeline is connected between the helium detection main pipeline and the nitrogen source, and the nitrogen injection valve is arranged on the fourth branch pipeline.

5. The helium detection device according to claim 1 or 2, characterized in that: Also includes: a fifth branch pipeline and a first air-breaking valve, wherein one end of the fifth branch pipeline is connected to the helium detection main pipeline, and the other end is connected to the external environment, and the first air-breaking valve is arranged on the fifth branch pipeline; A first pressure sensor is used to detect the gas pressure in the helium detection main line.

6. A battery detection system, characterized in that: include: A testing platform, wherein the testing platform has a testing position for placing a battery to be tested; A conveying device, the conveying device is used to convey the battery to be tested to the testing position; A helium compression device, which is installed on the detection platform and is used to compress helium on the cap of the battery to be detected; The helium detection device according to any one of claims 1 to 5, wherein the helium detection device is installed on the detection platform and is used to detect helium on the cap of the battery to be detected after helium is compressed.

7. The battery detection system according to claim 6, characterized in that: The helium compression device comprises: A helium compression main line and a helium compression sealing head, wherein the helium compression sealing head is used to be arranged outside the cap of the battery to be tested before helium compression to form a helium compression cavity, and the helium compression cavity is connected to the helium compression main line; A helium source and a helium compression valve, wherein the helium source is connected to the helium compression main line through the helium compression valve; a helium injection vacuum pump and a helium injection vacuum valve, wherein the helium injection vacuum pump is connected to the helium compression main line through the helium injection vacuum valve; A helium recovery system and a helium recovery valve, wherein the helium recovery system is connected to the compressed helium main line through the helium recovery valve; a second air-breaking valve, through which the helium-compressed main line is connected to the external environment; A second pressure sensor is used to detect the gas pressure in the helium pressure main line.

8. The battery detection system according to claim 6 or 7, characterized in that: The detection platform includes multiple detection areas, each of which is equipped with the helium compression device and the helium detection device, each of which has multiple detection positions, and the helium compression device and the helium detection device are configured to compress and detect helium on multiple batteries to be detected placed in the multiple detection positions.

9. A helium detection method, applied to a battery detection system as claimed in any one of claims 6 to 8, characterized in that: include: After the battery to be tested reaches the testing position and is fixed, the helium testing sealing head is controlled to seal the cap of the battery to be tested to form a helium testing cavity; Control the helium detection vacuum pump to evacuate the helium detection main line and the helium detection cavity; After evacuation, the control leak detector and the standard leak hole are connected to the main helium detection line; Obtain the standard leak rate of the standard leak hole and the calibrated measurement leak rate of the leak detector; Based on the calibrated measurement leak rate and the standard leak rate, obtaining an error rate of the helium detection device; Controlling the helium pressing device to pressurize the cap of the battery to be tested with helium; Controlling the helium detection device to detect the helium on the cap of the battery to be detected after the helium is compressed to obtain the helium detection leakage rate of the leak detector; Based on the helium detection leak rate and the error rate, obtaining the actual helium detection leak rate; Based on the actual helium leak rate and the standard leak rate, it is determined whether the air tightness of the cap of the battery to be tested is qualified.

10. The helium detection method according to claim 9, characterized in that: The determining whether the air tightness of the cap of the battery to be tested is qualified based on the actual helium leak rate and the standard leak rate includes: comparing the actual leak rate of the helium test with the standard leak rate; When the comparison result shows that the difference between the actual helium leak rate and the standard leak rate is within a preset range, determining that the air tightness of the cap of the battery to be tested is qualified; When the comparison result shows that the difference between the actual helium leak rate and the standard leak rate exceeds a preset range, it is determined that the airtightness of the cap of the battery to be tested is unqualified.

11. The helium detection method according to claim 9, characterized in that: The step of obtaining the error rate of the helium detection device based on the calibrated measurement leak rate and the standard leak rate comprises: The error rate = the standard leak rate / the calibrated measurement leak rate; and, The obtaining of the actual helium detection leak rate based on the helium detection leak rate and the error rate comprises: The actual helium detection leak rate=the helium detection leak rate×the error rate.

12. The helium detection method according to claim 9, characterized in that: After obtaining the standard leak rate of the standard leak hole and the calibrated measurement leak rate of the leak detector, the method further includes: Control the nitrogen source to be connected to the helium detection main line, and inject nitrogen into the helium detection main line and the helium detection cavity for purging; After purging, the cavity cleaning pump is controlled to be connected with the main helium detection line to clean the main helium detection line and the helium detection cavity; After the cavity is cleared, the main helium detection line is controlled to be connected to the external environment, and the vacuum of the main helium detection line and the helium detection cavity is broken; Control the helium detection sealing head to break contact with the battery to be detected.

13. The helium detection method according to claim 9, characterized in that: The helium detection leakage rate includes: the maximum measurement value of the leak detector within the target time length and the measurement value at the end time.

14. The helium detection method according to any one of claims 9 to 13, characterized in that: The helium pressure controlling device pressurizes the cap of the battery to be inspected with helium, comprising: Controlling the helium pressure sealing head to seal the cap of the battery to be tested to form a helium pressure cavity; Control the helium pressure vacuum pump to evacuate the helium pressure main line and the helium pressure cavity; After evacuation, the helium source is controlled to be connected to the helium pressure main line, and helium is injected into the helium pressure main line and the helium pressure cavity to maintain the pressure; After the pressure maintenance is completed, the helium recovery system is controlled to be connected with the helium compression main line to recover the helium in the helium compression main line and the helium compression chamber; After recovery, the main helium pressure line is controlled to be connected to the external environment, and the vacuum of the main helium pressure line and the helium pressure chamber is broken; The helium pressure sealing head is controlled to be out of contact with the battery to be tested.

15. The helium detection method according to any one of claims 9 to 13, characterized in that: The controlling helium detection device detects helium on the cap of the battery to be detected after helium is compressed to obtain the helium detection leakage rate of the leak detector, including: Controlling the helium detection sealing head to seal the cap of the battery to be detected to form a helium detection cavity; Control the helium detection vacuum pump to evacuate the helium detection main line and the helium detection cavity; After evacuation, the control leak detector is connected to the main helium detection line; Obtain the helium detection leak rate of the leak detector; Control the nitrogen source to be connected to the helium detection main line, and inject nitrogen into the helium detection main line and the helium detection cavity for purging; After purging, the cavity cleaning pump is controlled to be connected with the main helium detection line to clean the main helium detection line and the helium detection cavity; After the cavity is cleared, the main helium detection line is controlled to be connected to the external environment, and the vacuum of the main helium detection line and the helium detection cavity is broken; Control the helium detection sealing head to break contact with the battery to be detected.

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