A detection device and method for the quality of heat sealing of a lead-acid battery housing

Abstract

The present application relates to lead-acid battery detection technical field, disclose a kind of detection device and detection method of lead-acid battery shell heat sealing quality, detection device includes air pump, clamping device and support block, clamping device is adapted to the shell of battery to be measured, air pump is sequentially sealed with pressure controller, automatic switch valve and sealed kettle by conduit, automatic switch valve is electric and / or signal connection with pressure controller, sealed kettle is detachably sealed with the injection hole on the shell of battery to be measured;The size of support block is adapted to the size of the cell of battery shell to be measured, pressure controller is used to set and monitor test pressure and test time, automatic switch valve controls to be measured battery shell inside inflation or deflation.Detection method uses the detection device described above to detect the heat sealing quality of battery shell.The detection method prevents battery shell from bulging around when inflating, judges the gas tightness, heat sealing strength and weak point of shell by the pressure and time that battery shell bears.

Description

Technical Field

[0001] This invention belongs to the field of lead-acid battery testing technology, and particularly relates to a testing device and method for testing the heat sealing quality of lead-acid battery casings. Background Technology

[0002] Lead-acid batteries mainly consist of a battery cover, battery case, electrode assembly, and electrolyte. During production, after the electrode assembly is installed into the battery case, the battery cover is heat-sealed to the battery case. Then, electrolyte is injected into the battery for formation. After formation, a sealing plug is installed at the injection hole, completing the manufacturing process of the finished battery. The quality of the heat sealing directly affects the safety of the battery. Poor heat sealing can easily lead to leakage, gas leakage, vehicle corrosion, and shortened battery life.

[0003] Currently, lead-acid battery manufacturers primarily use the following methods for first-piece or in-process sampling inspections of battery casing heat-sealing quality (including airtightness and heat-sealing strength): First, an airtightness testing machine is used to separately test the airtightness of the battery casing. Then, the battery cover is pried open with a tool to observe the adhesion marks on the heat-sealed joint surface between the battery slot and the cover, while simultaneously feeling the prying force to evaluate the heat-sealing quality. This requires experienced operators, is highly subjective, and the heat-sealing strength cannot be quantified. Alternatively, after the battery is heat-sealed, clamps are used to fix the battery cover around its perimeter, and then a stretching machine is used to stretch the adhesion strength of the heat-sealed joint surface between the battery slot and the cover. However, this test only measures the heat-sealing strength of the clamp's active area and cannot determine the specific location of the clamp's active area or the weak points of the heat-sealed joint surface inside the battery.

[0004] Therefore, providing a device and method for inspecting the heat-sealing quality of battery casings is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a device for detecting the heat sealing quality of lead-acid battery casings, aiming to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A device for testing the heat-sealing quality of a lead-acid battery casing includes an air pump, a clamping device, and a support block. The clamping device is a rectangular groove adapted to the casing of the battery under test. The output end of the air pump is sequentially and sealed to a pressure controller, an automatic switching valve, and a sealing vessel via a conduit. The automatic switching valve is electrically and / or signal-connected to the pressure controller. The sealing vessel is detachably and sealed to the filling hole on the casing of the lead-acid battery under test. The size of the support block is adapted to the cell size inside the casing of the battery under test. The pressure controller is used to set and monitor the pressure of the test gas and the test time. The automatic switching valve controls the inflation or deflation of gas into the casing of the battery under test. When the pressure inside the casing of the battery under test reaches the pressure set value, the automatic switching valve closes, and the casing maintains the current pressure. When the time reaches the time set value, the automatic switching valve opens, and the gas inside the casing of the battery under test is released.

[0008] Preferably, there are several clamping devices, and the size of each clamping device is adapted to the battery casing of different models and sizes to be tested.

[0009] Preferably, the clamping device includes a first clamping plate, a second clamping plate, a third clamping plate, and a fourth clamping plate connected end to end, and a base plate is connected to one side of the first clamping plate, the second clamping plate, the third clamping plate, and the fourth clamping plate.

[0010] Preferably, the clamping device is a finely adjustable inner cavity, the first clamping plate, the third clamping plate and the base plate are fixedly connected together, the second clamping plate can move away from or close to the first clamping plate, and the fourth clamping plate can move away from or close to the third clamping plate.

[0011] Preferably, the first clamping plate is rotatably connected to a first rotating screw on the side near the bottom plate, and the second clamping plate is provided with a slider that cooperates with the first rotating screw. The rotation of the first rotating screw causes the second clamping plate to move away from or closer to the first clamping plate; the third clamping plate is rotatably connected to a second rotating screw on the side near the bottom plate, and the fourth clamping plate is provided with a slider that cooperates with the second rotating screw. The rotation of the second rotating screw causes the fourth clamping plate to move away from or closer to the third clamping plate.

[0012] Preferably, the support block includes a middle grid support block and a side grid support block. The middle grid support block is placed in the middle grid of the battery slot inside the battery casing of the battery under test, and the side grid support block is placed in the side grid of the battery slot inside the battery casing of the battery under test.

[0013] Preferably, the pressure controller includes a pressure control component and a time control component, wherein the pressure control component is used to set and display the pressure of the test gas, and the time control component is used to set and display the test time.

[0014] Preferably, the air pump is further provided with a switch for controlling the supply gas pressure value, wherein the supply gas pressure value is greater than the test gas pressure value set by the pressure controller.

[0015] A second objective of this invention is to provide a method for testing the heat-sealing quality of lead-acid battery casings. This method involves placing the middle and side cell support blocks into the battery compartment before heat-sealing the battery. The heat-sealed battery casing is then placed in a clamping device to prevent bulging during inflation, and the support blocks prevent bending of the inner walls of the battery casing cells. Subsequently, gas at a certain pressure is injected, and the pressure and time the battery casing withstands are tested.

[0016] A method for detecting the heat-sealing quality of a lead-acid battery casing, comprising the following steps, using the lead-acid battery casing heat-sealing quality detection device described in the above technical solution to detect the heat-sealing quality of the battery casing to be tested:

[0017] Step S1: Place the support block into the corresponding side and middle compartments of the battery compartment, then cover the battery cover onto the battery compartment, send it into the heat sealing machine and heat seal it. After heat sealing, let the battery case stand at room temperature and wait for testing.

[0018] Step S2: Adjust the inner cavity size of the clamping device to be slightly larger than the outer dimensions of the battery case to be tested, so that the battery case to be tested can be smoothly placed into the clamping device. Then adjust the clamping device to be close to and clamped against the four sides of the battery case to be tested.

[0019] Step S3: Set the required first test pressure, second test pressure, first test time, and second test time on the pressure controller;

[0020] Step S4: Seal the sealing container to one of the filling holes of the battery casing;

[0021] Step S5: Turn on the air pump and fill the test cell of the battery casing with air through the sealed container to test the heat sealing quality of the battery casing;

[0022] Step S51: When the pressure of the gas charged into the cell to be tested in the battery housing 4 reaches the first test pressure, the automatic switch valve 6 closes and the air pump stops working, so that the pressure in the cell to be tested in the battery housing 4 is maintained. At the same time, the pressure controller 7 starts timing. After the first test time, the automatic switch valve 6 opens and the air pump is connected to the cell to be tested in the battery housing 4. The air pump continues to work to charge the cell to be tested in the battery housing 4 to the second test pressure.

[0023] Step S511: Observe and record the pressure change in the test cell of the battery housing 4 during the first test time. If the battery housing can maintain the pressure inside the battery housing consistent with the first test pressure during the first test time, the airtightness of the battery housing under test is qualified; otherwise, the airtightness is unqualified.

[0024] Step S52: When the pressure in the cell to be tested of the battery casing reaches the second test pressure value set in S3, the automatic switch valve closes, the air pump stops working, and the pressure controller 7 starts timing. If the pressure in the battery casing does not change when the second test time set in S3 is reached, the heat seal strength of the battery casing is qualified. If the pressure in the cell to be tested of the battery casing decreases within the second test time set in S3, the heat seal strength of the battery casing is unqualified.

[0025] Step S6: After the test is completed, the automatic switch valve is opened and connected to the exhaust pipe. The exhaust pipe is connected to the outside atmosphere, and the gas inside the battery casing is discharged and depressurized through the automatic switch valve. Then, the sealing bottle is removed from the filling hole of the cell to be tested. Step S7: Repeat steps S4 to S6 until each cell of the battery casing is tested.

[0026] Step S8: After each cell of the battery casing has been tested, if there are any unqualified battery cells, dissect and locate the location where the heat sealing quality of the battery casing is unqualified.

[0027] Compared with the existing technology, the present technical solution has the following beneficial effects:

[0028] This invention introduces a certain pressure into the battery casing to be tested. Simultaneously, a support block and clamping device restrict horizontal bending deformation of the battery compartment's central wall or the outer walls around the battery compartment. This causes the internal gas pressure to act evenly on the battery cover, squeezing it outwards. This generates an outward tensile force on the heat-sealed interface between the battery cover and the battery compartment. When there are weak points in the heat-sealed interface, such as insecure welding, these weak points will burst or crack first when the internal pressure reaches a certain value. This allows for the identification of specific defects in the heat-sealing process. In other words, by testing the gas pressure and time the battery casing can withstand, the heat-sealing strength of the battery compartment, battery cover, and the inner and outer walls of the battery compartment can be determined.

[0029] After air is introduced into the cells of the battery casing, the automatic switching valve closes and checks the pressure holding of the battery casing. If air leakage is found, the heat sealing quality is unqualified. In this way, the present invention can simultaneously detect the airtightness and heat sealing strength of the battery casing, find the weak points in the heat sealing quality of the battery casing, and identify the specific unqualified locations of the heat sealing process. The process can be adjusted and optimized in real time to improve the stability of the heat sealing quality of the battery casing and prevent leakage of liquid or air during battery use. Attached Figure Description

[0030] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0031] Figure 2 This is a three-dimensional structural schematic diagram of the clamping device of the present invention (rear view).

[0032] Figure 3 This is a schematic diagram of the support block of the present invention;

[0033] Figure 4 This is a three-dimensional structural diagram of the battery casing of the present invention;

[0034] Figure 5 This is a three-dimensional structural diagram of the battery compartment of the present invention;

[0035] Figure 6 This is a schematic diagram illustrating the testing of the battery casing according to the present invention.

[0036] In the diagram, 1 is an air pump; 2 is a clamping device; 21 is a first clamping plate; 22 is a second clamping plate; 23 is a third clamping plate; 24 is a fourth clamping plate; 31 is a middle compartment support block; 32 is a side compartment support block; 4 is a battery casing; 41 is an injection hole; 42 is a battery cover; 43 is a battery slot; 44 is a side compartment; 45 is a middle compartment; 5 is a conduit; 6 is an automatic switching valve; 7 is a pressure controller; 8 is a sealing container; 9 is a base plate; 10 is a first rotating screw; 11 is a second rotating screw; 12 is a turntable; and 13 is a switch. Detailed Implementation

[0037] The embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0038] like Figures 1 to 6As shown, a heat-sealing quality testing device for lead-acid battery casings includes an air pump 1, a clamping device 2, and a support block. The size of the support block is adapted to the cell size inside the battery compartment of the battery casing 4 to be tested. The support block supports the battery compartment, preventing the sidewalls of the battery compartment cells from bending and deforming due to heat under the high temperature of the heating plate during the battery heat-sealing process, thus ensuring alignment and heat sealing with the cell walls of the battery cover 42. This also prevents horizontal bending and deformation of the cell sidewalls when high-pressure gas is filled into the battery casing, which would affect the heat-sealing strength test results and compromise test consistency. The clamping device 2 is a rectangular slot adapted to the casing 4 of the lead-acid battery under test. The output end of the air pump 1 is sequentially and sealed to a pressure controller 7, an automatic switching valve 6, and a sealing vessel 8 via a conduit 5. The automatic switching valve 6 is electrically and / or signal-connected to the pressure controller 7. The sealing vessel 8 is detachably and sealed to the injection hole 41 on the casing 4 of the lead-acid battery under test. The pressure controller 7 is used to set and monitor the pressure of the test gas and the test time. The automatic switching valve 6 controls the inflation or deflation of gas into the casing 4 of the battery under test. When the pressure inside the casing of the battery under test reaches the pressure set value, the automatic switching valve 6 closes, and the casing 4 maintains the current pressure. When the time reaches the time set value, the automatic switching valve 6 opens, and the gas inside the casing 4 is vented and depressurized. After each cell of the battery casing 4 is tested, if there are any unqualified battery cells, the casing is dissected to find the location where the heat sealing quality of the battery casing is unqualified. If the casing passes the test, the battery casing is dissected and the support block is removed for future use.

[0039] Specifically, a support block is placed inside the cell of the battery compartment to prevent the sidewalls of the cell inside the battery compartment 43 from bending and deforming under the high temperature of the heating plate during the battery heat sealing process. Then, the battery cover 42 is fastened onto the battery compartment 43, and the battery cover 42 and the battery compartment 43 are simultaneously placed into the heat sealing machine for heat sealing, so that the four sides of the battery compartment 43, the sidewalls of the cell inside the battery compartment, and the four sides of the battery cover 42, and the sidewalls of the cell inside the battery cover 42 are aligned and heat-sealed. After cooling, the battery housing 4 is placed into the clamping device 2, so that the sealing pot 8 is sealed to the filling hole 41 of the battery housing. The required test pressure and test time are set on the pressure controller 7, and the air pump is turned on to fill the battery housing 4 with air until the pressure inside the battery housing 4 reaches the set test pressure value, at which point the automatic switch valve 6 closes. At this time, the clamping device 2 is pressed against the side wall and bottom wall of the battery casing 4 to prevent the side wall or bottom wall from bulging outward under high pressure. The high-pressure gas acts evenly on the battery cover 42, pushing it vertically outward and creating tension at the heat-sealed joint surface between the battery cover 42 and the battery slot 43, thus testing the heat-sealing strength of the battery casing. If the battery casing leaks air during the test pressure and test time, the heat-sealing quality is unqualified; for example, weak parts such as poor welding during heat sealing may break or crack, causing leakage. The leaking parts of the casing are dissected to accurately identify the specific location of the heat-sealing failure. The heat-sealing process of the battery casing is then optimized and adjusted accordingly. Therefore, the testing device of this invention can simultaneously test the sealing and heat-sealing strength of the battery casing under a certain pressure. If the battery casing 4 shows no leakage or damage during the test pressure and test time, the heat-sealing quality of the battery casing is qualified. The automatic switching valve 6 opens, releasing the gas pressure inside the battery casing 4 under test, completing the test.

[0040] In one embodiment, there are several clamping devices 2, and the size of each clamping device 2 is adapted to the external dimensions of the battery casing 4 to be tested of different models and sizes.

[0041] In one embodiment, the inner cavity size of the clamping device 2 can be finely adjusted. The maximum inner cavity size of the clamping device is slightly larger than the outer dimensions of the battery housing 4. The clamping device 2 and the battery housing 4 are adjusted to form an assembly gap, which facilitates the battery housing 4 to be placed into or removed from the clamping device 2. The minimum inner cavity size of the clamping device 2 is adapted to the outer dimensions of the battery housing 4, so that the clamping device 2 can be closely attached to the outer wall of the battery housing 4.

[0042] In one embodiment, the clamping device 2 includes a first clamping plate 21, a second clamping plate 22, a third clamping plate 23, and a fourth clamping plate 24 connected end to end. A base plate is connected to one side of the first clamping plate 21, the second clamping plate 22, the third clamping plate 23, and the fourth clamping plate 24, which together form a rectangular clamping device 2 with an opening on one side. The dimensions of the first clamping plate 21, the second clamping plate 22, the third clamping plate 23, the fourth clamping plate 24, and the base plate 9 are consistent with the dimensions corresponding to the battery compartment.

[0043] In one embodiment, the inner cavity of the clamping device 4 can be finely adjusted, the first clamping plate 21, the third clamping plate 23 and the base plate 9 are fixedly connected together, the second clamping plate 22 can move away from or close to the first clamping plate 21, and the fourth clamping plate 24 can move away from or close to the third clamping plate 23.

[0044] In a preferred embodiment, the first clamping plate 21, the third clamping plate 23, and the base plate 9 are fixedly connected as a whole. A first rotating screw 10 is rotatably connected to the side of the first clamping plate 21 near the base plate. A slider that cooperates with the first rotating screw 10 is provided on the second clamping plate 22. The rotation of the first rotating screw 10 causes the second clamping plate 22 to move away from or closer to the first clamping plate 21. A second rotating screw 11 is rotatably connected to the side of the third clamping plate 23 near the base plate. A slider that cooperates with the second rotating screw 11 is provided on the fourth clamping plate 24. The rotation of the second rotating screw 11 causes the fourth clamping plate 24 to move away from or closer to the third clamping plate 23, thereby realizing the fine adjustment of the inner cavity size of the clamping device 2. Slide rails or tracks are provided on the connecting surfaces of the base plate 9 and the second clamping plate 22, the connecting surface of the base plate 9 and the fourth clamping plate 24, and / or the connecting surfaces between the second clamping plate 22 and the third clamping plate 23 and the fourth clamping plate 24, and the connecting surfaces between the fourth clamping plate 24 and the first clamping plate 21 and the second clamping plate 22, to restrict the sliding direction of the second clamping plate 22 and the fourth clamping plate 24. Furthermore, limiting devices are also provided on the slide rails or tracks to fix the positions of the second clamping plate 22 and the fourth clamping plate 24. Even further, turntables 12 are fixedly connected to the ends of the first rotating screw 10 and the second rotating screw 11 to facilitate rotation of the first rotating screw 10 and the second rotating screw 11.

[0045] In one embodiment, the support block includes a middle grid support block 31 and a side grid support block 32. The external dimensions of the middle grid support block 31 match the internal dimensions of the middle grid of the battery compartment, and the external dimensions of the side grid support block 32 match the internal dimensions of the side grid of the battery compartment. The side grid support block 32 has a cylindrical shape corresponding to the plastic-coated platform of the lead pipe in the battery cover, to prevent the plastic-coated platform of the lead pipe from contacting or interfering with the heat sealing process of the battery compartment and cover. The middle grid support block 31 is placed in the middle grid 45 of the battery compartment within the battery housing 4 to be tested, and the side grid support block 32 is placed in the side grid 44 of the battery compartment within the battery housing 4 to be tested.

[0046] Furthermore, the battery compartment 43 is divided into six equally sized cells. Each cell includes two side cells and four middle cells 45. Two side cell support blocks 32 and four middle cell support blocks 31 are provided, and these support blocks are placed into their respective cells. The battery cover 42 has heat-sealing platforms on its outer wall and inner wall corresponding to the battery compartment 4. When the battery compartment 4 and battery cover 42 are heat-sealed together, the inside of the battery casing 4 consists of six independently sealed cells.

[0047] In one embodiment, the pressure controller 7 includes a pressure control component and a time control component. The pressure control component is used to set and display the test pressure, and the time control component is used to set and display the test time. Specifically, the pressure control component includes a pressure setting gauge and a pressure display gauge. The pressure setting gauge is used to set a first test pressure value and a second test pressure value, and the pressure display gauge is used to display the pressure inside the battery casing. The time control component includes a time setting gauge and a time display gauge. The time setting gauge is used to set a first test time and a second test time, and the time display gauge is used to display the duration of the test. When the pressure displayed by the pressure display gauge matches the test pressure set by the pressure setting gauge, the automatic switching valve 6 automatically closes, sealing and maintaining pressure inside the battery casing. When the time displayed by the time display gauge matches the test time set by the time setting gauge, the automatic switching valve 6 automatically opens, releasing air and pressure inside the battery casing.

[0048] In one embodiment, the air pump 1 is further provided with a switch 13. The switch 13 can set the pressure value of the gas supplied by the air pump 1. Preferably, the supply gas pressure value is slightly higher than the second test gas pressure value set by the pressure controller 7, ensuring that the pressure displayed by the pressure controller 7 can reach the set first test pressure or the second test pressure. Furthermore, the switch 13 is electrically connected and / or signal connected to the pressure controller 7. When the gas supplied by the air pump 1 reaches the first test pressure or the second test pressure value set by the pressure controller 7, the switch 13 is closed, and the air pump stops working.

[0049] A method for detecting the heat-sealing quality of a lead-acid battery casing, comprising the following steps, using the lead-acid battery casing heat-sealing quality detection device described in the above technical solution to detect the heat-sealing quality of the battery casing to be tested:

[0050] Step S1: Place the support block into the corresponding side grid 44 and middle grid 45 of the battery compartment, then cover the battery cover onto the battery compartment, send it into the heat sealing machine and heat seal it. After heat sealing, let the battery case stand at room temperature and wait for testing.

[0051] Step S2: Adjust the inner cavity size of the clamping device 2 to be slightly larger than the outer size of the battery case 4 to be tested, so that the battery case 4 to be tested can be smoothly placed into the clamping device 2. Then adjust the clamping device 2 to be close to and clamped on the four sides of the battery case 4 to be tested, and the bottom wall of the battery case 4 is in contact with the bottom plate 9 of the clamping device 2.

[0052] Step S3: Set the required first test pressure, second test pressure, first test time, and second test time on the pressure controller 7;

[0053] Step S4: Insert and seal the sealing container 8 into one of the filling holes 41 of the battery housing 4;

[0054] Step S5: Turn on the air pump 1 and fill the test cell of the battery casing 4 with air through the sealing bottle 8 to test the heat sealing quality of the battery casing 4.

[0055] Step S51: When the pressure of the gas charged into the cell to be tested in the battery housing 4 reaches the first test pressure, the automatic switch valve 6 closes and the air pump stops working, so that the pressure in the cell to be tested in the battery housing 4 is maintained. At the same time, the pressure controller 7 starts timing. After the first test time, the automatic switch valve 6 opens and the air pump is connected to the cell to be tested in the battery housing 4. The air pump continues to work to charge the cell to be tested in the battery housing 4 to the second test pressure.

[0056] Step S511: Observe and record the pressure change in the test cell of the battery housing 4 during the first test time. If the battery housing can maintain the pressure inside the battery housing consistent with the first test pressure during the first test time, the airtightness of the battery housing under test is qualified; otherwise, the airtightness is unqualified.

[0057] Step S52: When the pressure in the cell to be tested of the battery housing 4 reaches the second test pressure value set in S3, the automatic switch valve 6 closes, the air pump 1 stops working, and the pressure controller 7 starts timing. If the pressure in the cell to be tested of the battery housing 4 does not change when the second test time set in S3 is reached, the heat seal strength of the cell to be tested of the battery housing 4 is qualified. If the pressure in the cell to be tested of the battery housing 4 decreases within the second test time set in S3, the heat seal strength of the cell to be tested of the battery housing 4 is unqualified.

[0058] Step S6: After the test is completed, the automatic switch valve 6 is opened and connected to the exhaust pipe. The exhaust pipe is connected to the outside atmosphere. The gas inside the cell to be tested in the battery casing 4 is discharged from the exhaust pipe to release pressure. The sealing bottle is removed from the filling hole of the cell to be tested.

[0059] Step S7: Repeat steps S4 to S6 until every cell of the battery casing 4 has been tested.

[0060] Step S8: After each cell of the battery casing has been tested, if there are any unqualified battery cells, dissect and locate the location where the heat sealing quality of the battery casing is unqualified.

[0061] In a preferred embodiment, the battery casing is left to stand at room temperature for more than 10 minutes.

[0062] In a preferred embodiment, in S4, the test pressure and test time are set according to the performance and process parameters of the battery casing. Preferably, the first test pressure is 20-30 kPa and the first test time is 8-10 s, the second test pressure is 150-170 kPa and the second test time is 9-11 s, and further, the second test pressure is 160 kPa and the second test time is 10 s.

[0063] In a preferred embodiment, in step 511, when the airtightness of cell 4 of the battery casing under test is unqualified, if air is continued to be filled into cell 4 of the battery casing under test to a certain pressure, the sealed cell 4 of the battery casing under test will burst or rupture at the leaking location, thereby identifying the specific unqualified location of the heat sealing process; even if the airtightness of cell 4 of the battery casing under test is qualified, there may be locations where the heat seal is not firm. In this case, if air is continued to be filled into cell 4 of the battery casing under test to a certain pressure, the locations where the heat seal is not firm will burst or rupture first, thus identifying the weak points of the heat seal strength of the battery casing; and then process adjustments and optimizations can be made in real time.

[0064] In a preferred embodiment, in step 52, if the pressure value displayed by the pressure display does not reach the second test pressure value of the pressure setting table, or the time value displayed by the time display does not reach the second test time set by the time setting table, the battery casing 4 leaks air, that is, the heat sealing strength is unqualified, and the heat sealing process needs to be optimized and adjusted to meet the process standard before production can continue.

[0065] This embodiment is merely an illustration of the concept and implementation of the present invention and is not intended to limit it. Under the concept of the present invention, technical solutions without substantial changes are still within the scope of protection.

Claims

1. A device for detecting the heat-sealing quality of a lead-acid battery casing, comprising an air pump, characterized in that, It also includes a clamping device and a support block. The clamping device is a rectangular groove adapted to the casing of the battery under test. The output end of the air pump is sequentially and sealed to a pressure controller, an automatic switching valve, and a sealing vessel via a conduit. The automatic switching valve is electrically and / or signal-connected to the pressure controller. The sealing vessel is detachably and sealed to the filling hole on the casing of the battery under test. The size of the support block is adapted to the cell size inside the casing of the battery under test. The pressure controller is used to set and monitor the pressure of the test gas and the test time. The automatic switching valve controls the inflation or deflation of gas into the casing of the battery under test. When the pressure inside the casing of the battery under test reaches the pressure set value, the automatic switching valve closes, and the casing of the battery under test maintains the current pressure. When the time reaches the time set value, the automatic switching valve opens, and the gas inside the casing of the battery under test is vented and depressurized.

2. The device for detecting the heat-sealing quality of lead-acid battery casing as described in claim 1, characterized in that, The clamping device is provided in several parts, and the size of each clamping device is adapted to the battery casing of different models and sizes.

3. The device for detecting the heat-sealing quality of lead-acid battery casing as described in claim 2, characterized in that, The clamping device includes a first clamping plate, a second clamping plate, a third clamping plate, and a fourth clamping plate connected end to end, and a base plate is connected to one side of the first clamping plate, the second clamping plate, the third clamping plate, and the fourth clamping plate.

4. The device for detecting the heat-sealing quality of lead-acid battery casing as described in claim 3, characterized in that, The clamping device is provided with a finely adjustable inner cavity. The first clamping plate, the third clamping plate and the base plate are fixedly connected together. The second clamping plate can move away from or closer to the first clamping plate, and the fourth clamping plate can move away from or closer to the third clamping plate.

5. The device for detecting the heat-sealing quality of lead-acid battery casing as described in claim 4, characterized in that, The first clamping plate is rotatably connected to a first rotating screw on the side near the bottom plate, and the second clamping plate is provided with a slider that cooperates with the first rotating screw. The rotation of the first rotating screw causes the second clamping plate to move away from or closer to the first clamping plate; the third clamping plate is rotatably connected to a second rotating screw on the side near the bottom plate, and the fourth clamping plate is provided with a slider that cooperates with the second rotating screw. The rotation of the second rotating screw causes the fourth clamping plate to move away from or closer to the third clamping plate.

6. The device for detecting the heat-sealing quality of lead-acid battery casing as described in claim 1, characterized in that, The support block includes a middle grid support block and a side grid support block. The middle grid support block is placed in the middle grid of the battery slot inside the battery casing of the battery under test, and the side grid support block is placed in the side grid of the battery slot inside the battery casing of the battery under test.

7. The device for detecting the heat-sealing quality of lead-acid battery casing as described in claim 1, characterized in that, The pressure controller includes a pressure control component and a time control component. The pressure control component is used to set and display the test pressure, and the time control component is used to set and display the test time.

8. The device for detecting the heat-sealing quality of lead-acid battery casing as described in claim 7, characterized in that, The air pump is also equipped with a switch for controlling the supply gas pressure value, which is greater than the test pressure value set by the pressure controller.

9. A method for detecting the heat-sealing quality of a lead-acid battery casing, characterized in that, The method for detecting the heat-sealing quality of a lead-acid battery casing using the heat-sealing quality testing device according to any one of claims 1 to 8 specifically includes the following steps: Step S1: Place the support block into the corresponding side and middle compartments of the battery compartment, then cover the battery cover onto the battery compartment, send it into the heat sealing machine and heat seal it. After heat sealing, let the battery casing stand at room temperature and wait for testing. Step S2: Adjust the inner cavity size of the clamping device to be slightly larger than the outer dimensions of the battery casing to be tested, so that the battery casing to be tested can be smoothly placed into the clamping device. Then adjust the clamping device to be close to and clamped against the four side walls of the battery casing to be tested. Step S3: Set the required first test pressure, second test pressure, first test time, and second test time on the pressure controller; Step S4: Seal the sealing container to one of the filling holes of the battery casing; Step S5: Turn on the air pump and fill the test cell of the battery casing under test through the sealed container with air to test the heat sealing quality of the battery casing under test. Step S51: When the pressure of the gas charged into the cell to be tested in the battery casing reaches the first test pressure, the automatic switch valve closes and the air pump stops working, so that the pressure in the cell to be tested in the battery casing is maintained. At the same time, the pressure controller starts timing. After the first test time, the automatic switch valve opens, the air pump is connected to the cell of the battery casing to be tested, and the air pump continues to work to charge the cell to be tested in the battery casing to the second test pressure. Step S511: Observe and record the pressure change in the test cell of the battery casing during the first test time. If the pressure inside the battery casing can be kept consistent with the first test pressure during the first test time, the airtightness of the battery casing is qualified; otherwise, the airtightness is unqualified. Step S52: When the pressure in the cell to be tested of the battery casing reaches the second test pressure set in S3, the automatic switch valve closes, the air pump stops working, and the pressure controller starts timing. If the pressure in the battery casing does not change when the second test time set in S3 is reached, the heat seal strength of the battery casing is qualified. If the pressure in the cell to be tested of the battery casing decreases within the second test time set in S3, the heat seal strength of the battery casing is unqualified. Step S6: After the test is completed, the automatic switch valve is opened and connected to the exhaust pipe. The exhaust pipe is connected to the outside atmosphere, and the gas inside the battery casing is discharged and depressurized through the automatic switch valve. Then, the sealing bottle is removed from the filling hole of the cell to be tested. Step S7: Repeat steps S4 to S6 until every cell of the battery casing to be tested has been completed; Step S8: After each cell of the battery casing to be tested is completed, if there is a defective battery cell, dissect it to find the location where the heat sealing quality of the battery casing is unqualified.

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