Battery Waterproof Test Method

Abstract

The present application discloses a battery waterproof test method. The battery waterproof test method includes: controlling the flow of water in a test container to flush the battery to be tested submerged in the water in the test container; in response to the end of the flushing, performing a performance test on the battery to be tested to determine the waterproof performance of the battery to be tested. Among them, controlling the flow of water in the test container includes: controlling the flow rate and flow duration of water in the test container; controlling the flow rate of water in the test container includes: obtaining the water depth of the battery to be tested in the test container; controlling the water pressure of the water in the test container based on the water depth to control the flow rate of water in the test container. In the above manner, the battery waterproof test method of the present application can flush the battery to be tested by controlling the flow of water in the test container, so that the water wading test of the whole vehicle can be equivalently completed at the battery level, and the waterproof performance of the battery under water-wading conditions can be accurately obtained.

Description

Technical Field

[0001] The present application relates to the technical field of battery testing, and in particular to a battery waterproof testing method. Background Art

[0002] With the rapid development of electric vehicle technology, the number of electric vehicle applications has increased dramatically, but the probability of electric vehicles wading in rainy days, muddy environments, or under tunnel bridges and other waterlogged conditions has also increased. During the wading process of electric vehicles, due to different road conditions and the degree of waterlogging on the road, the batteries of electric vehicles will be affected to varying degrees, making wading road conditions a certain threat to the safety of vehicles and drivers. Therefore, electric vehicles need to pass waterproof tests before they are offline. However, the existing waterproof test methods are mostly immersion tests in static water pools, which cannot fully cover the actual application scenarios of electric vehicles. Therefore, a battery waterproof test method is urgently needed. Summary of the invention

[0003] The present application provides a battery waterproof testing method, aiming to solve the above-mentioned problems.

[0004] The present application provides a battery waterproof test method, which includes: controlling the flow of water in a test container to flush the battery to be tested submerged in the water in the test container; in response to the end of the flushing, performing a performance test on the battery to be tested to determine the waterproof performance of the battery to be tested. Among them, controlling the flow of water in the test container includes: controlling the flow rate and flow duration of water in the test container; controlling the flow rate of water in the test container includes: obtaining the water depth of the battery to be tested in the test container; controlling the water pressure of the water in the test container based on the water depth to control the flow rate of water in the test container. Therefore, the present application can perform a flushing test on the battery to be tested by controlling the flow of water in the test container, thereby completing the water wading test of the entire vehicle at the battery level, and can accurately obtain the waterproof performance of the battery under water-wading conditions. In addition, when controlling the flow of water in the test container, the present application can also simulate the state of water when the battery to be tested is installed in a vehicle and wading through water by controlling the flow rate and flow duration of the water, and control the pressure of the water in the test container by the water depth, so as to control the flow rate of the water in the test container by controlling the water pressure, thereby improving the accuracy of the battery waterproof test.

[0005] In some embodiments, flushing the battery to be tested submerged in water in the test container includes: at least one of accelerated flushing, uniform flushing, and decelerated flushing. Thus, it is possible to simulate the actual scenario of the battery to be tested wading in water at different speeds, thereby improving the accuracy of the battery waterproof test.

[0006] In some embodiments, the water pressure is the sum of the first preset proportional value of the water depth, the second preset proportional value of the flow velocity, and the preset value. Thus, the flow velocity of the water in the test container can be calculated based on the water pressure and the water depth through the preset mapping relationship, so that the flow velocity of the water in the test container can be controlled by pressure control.

[0007] In some embodiments, before the step of controlling the water flow in the test container to flush the battery to be tested submerged in the water in the test container, the battery waterproof test method further includes: adjusting the placement state of the battery to be tested in the water; wherein different placement states have different tilt angles and / or twisting degrees. Thus, by adjusting the placement state of the battery to be tested in the water, an actual scenario of the battery to be tested wading in water at different tilt angles can be simulated.

[0008] In some embodiments, adjusting the placement state of the battery under test in water includes: adjusting the battery under test to tilt downward at a first preset angle, so as to adjust the battery under test to a submerged state. Thus, by adjusting the battery under test to tilt downward at the first preset angle, an actual scene of the battery under test passing through a water-logged area on a downhill section at the first preset angle can be simulated.

[0009] In some embodiments, adjusting the placement state of the battery under test in water includes: adjusting the distortion of the battery under test to adjust the battery under test to a submerged state. Thus, by adjusting the distortion of the battery under test, the actual scene of the vehicle passing through a flooded area on an uneven road when the battery under test is installed on the vehicle can be simulated.

[0010] In some embodiments, adjusting the placement state of the battery under test in water includes: adjusting the battery under test to tilt upward by a second preset angle to adjust the battery under test to a water-out state. Thus, by adjusting the battery under test to tilt upward by the second preset angle, an actual scene of the battery under test passing through a water-poured area and being out of water can be simulated.

[0011] In some embodiments, before the step of controlling the water flow in the test container to flush the battery to be tested submerged in the water in the test container, the battery waterproof test method further includes: performing an initial performance test on the battery to be tested that is not submerged in water to obtain a first performance parameter; in response to the first performance parameter reaching a first preset requirement, the step of controlling the water flow in the test container to flush the battery to be tested submerged in the water in the test container is executed. Thus, by performing an initial performance test on the battery to be tested, the interference of the battery to be tested that does not meet the first performance parameter on the waterproof test can be reduced, thereby improving the accuracy of the waterproof test.

[0012] In some embodiments, performing the initial performance test on the unsubmerged battery includes: performing appearance test, initial airtightness test, insulation test and secondary airtightness test on the unsubmerged battery. Thus, by performing the appearance test, initial airtightness test, insulation test and secondary airtightness test on the unsubmerged battery, the interference of the unsubmerged battery with appearance defects, airtightness defects or insulation defects on the waterproof test can be reduced, thereby improving the accuracy of the waterproof test.

[0013] In some embodiments, performing a secondary airtightness test on a battery to be tested that is not submerged in water includes: filling a nitrogen-hydrogen mixed gas into the interior of the battery to be tested; performing an airtightness test on a preset position of the battery to be tested to determine the airtightness of the preset position; wherein the preset position at least includes the installation position of at least one of an explosion-proof valve, a high-voltage connector, a low-voltage connector, and a bolt. Thus, by performing a secondary airtightness test on the preset position of the battery to be tested, the interference of the battery to be tested with airtightness defects on the waterproof test can be further reduced, thereby further improving the accuracy of the waterproof test.

[0014] In some embodiments, before the step of controlling the water flow in the test container to flush the battery to be tested submerged in the water in the test container, the battery waterproof test method further includes: adding a color developer to the water. Thus, by adding a color developer to the water, the efficiency of subsequent inspection of whether water has entered the battery can be improved.

[0015] In some embodiments, in response to the end of flushing, the battery to be tested is subjected to performance testing to determine the waterproof performance of the battery to be tested, including: in response to the end of flushing, checking whether water has entered the battery; if no water has entered, the test is determined to have passed; if water has entered, the test is determined to have failed. Thus, through the battery-level waterproof test, this embodiment can check whether water has entered the battery without the need for an actual wading test, thereby improving the efficiency of the waterproof test.

[0016] In some embodiments, before checking whether water has entered the battery, in response to the completion of flushing, the step of performing a performance test on the battery to be tested to determine the waterproof performance of the battery to be tested further includes: performing a secondary performance test on the battery to be tested to obtain a second performance parameter; in response to the second performance parameter reaching a second preset requirement, performing the step of checking whether water has entered the battery. Thus, by performing a secondary performance test on the battery to be tested after flushing, interference of other factors on the waterproof test of the battery to be tested can be reduced.

[0017] Different from the prior art, the battery waterproof test method of the present application includes: installing the battery to be tested in a test container and submerging it in the water of the test container; controlling the flow of water in the test container to flush the battery to be tested; in response to the end of flushing, performing a performance test on the battery to be tested to determine the waterproof performance of the battery to be tested. Among them, controlling the flow of water in the test container includes: controlling the flow rate and flow duration of water in the test container; controlling the flow rate of water in the test container includes: obtaining the water depth of the battery to be tested in the test container; controlling the water pressure of the water in the test container based on the water depth to control the flow rate of water in the test container. In the above manner, the present application can flush the battery to be tested by controlling the flow of water in the test container, thereby completing the water wading test of the entire vehicle equivalently at the battery level, and can accurately obtain the waterproof performance of the battery under water-wading conditions. In addition, when controlling the flow of water in the test container, the present application can also simulate the state of water when the battery to be tested is installed in a vehicle and wading through water by controlling the flow rate and flow duration of the water, and control the pressure of the water in the test container by the water depth, so as to control the flow rate of the water in the test container by controlling the water pressure, thereby improving the accuracy of the battery waterproof test. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings herein are incorporated into the specification and constitute a part of the specification. These drawings illustrate embodiments consistent with the present application and are used together with the specification to illustrate the technical solution of the present application.

[0019] Figure 1 is a schematic diagram of the exploded structure of an embodiment of a battery provided by the present application;

[0020] Figure 2 is a schematic diagram of the exploded structure of an embodiment of a battery cell provided by the present application;

[0021] Figure 3 It is a structural schematic diagram of an embodiment of a battery waterproof testing system provided by the present application;

[0022] Figure 4 It is a structural schematic diagram of an embodiment of a test container provided by the present application;

[0023] Figure 5 It is a flow chart of the first embodiment of the battery waterproof testing method provided by the present application;

[0024] Figure 6 It is a flow chart of the second embodiment of the battery waterproof testing method provided by the present application;

[0025] Figure 7 yes Figure 6 A schematic diagram of a flow chart of an embodiment of step S201;

[0026] Figure 8 yes Figure 6 A flow chart of an embodiment of step S202;

[0027] Fig. 9 yes Figure 6 FIG. 1 is a flow chart of an embodiment of step S204 in FIG. DETAILED DESCRIPTION

[0028] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0030] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0031] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0032] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0033] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0034] The battery waterproof test method disclosed in the embodiment of the present application can be applied to various batteries, wherein the battery can be a pack including a control module, or a battery cell, a battery module or a battery module group that does not include a control module. Among them, the battery cell can be considered as the smallest unit that constitutes the battery. Each battery cell can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited to this. The battery cell can be cylindrical, flat, rectangular or other shapes. The battery module can be considered as a whole obtained by connecting multiple battery cells in series, in parallel or in mixed connection and accommodated in a box. Mixed connection means that multiple battery cells are both connected in series and in parallel. For example, multiple battery cells can be directly connected in series, in parallel or in mixed connection, and then the whole formed by multiple battery cells is accommodated in the box. The battery module can also be a battery module in which multiple battery cells are first connected in series, in parallel or in mixed connection, and multiple battery modules are then connected in series, in parallel or in mixed connection to form a whole and accommodated in the box.

[0035] like Figure 1 As shown, the present application provides a battery. Figure 1 1 is a schematic diagram of the exploded structure of an embodiment of a battery provided by the present application. As mentioned above, the battery 100 in this embodiment can be a pack including a control module, or a battery cell, a battery module or a battery module without a control module. Figure 1As shown, in this embodiment, the battery 100 includes a battery case 10 and a battery cell 20, and the battery cell 20 is contained in the battery case 10. Among them, the battery case 10 is used to provide a storage space for the battery cell 20, and the battery case 10 can adopt a variety of structures. In some embodiments, the battery case 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the battery case 10 formed by the first part 11 and the second part 12 can be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0036] Among them, Figure 1 As shown, an explosion-proof valve 33 is provided on the first portion 11, and the explosion-proof valve 33 is used to automatically release the overpressure gas when excessive pressure accumulates in the battery box 10. Figure 1 As shown, a high-voltage connector 31 and a low-voltage connector 32 may also be provided on the first part 11. The high-voltage connector 31 is used to transmit high-voltage electrical energy, signals and data signals; the low-voltage connector 32 is used to transmit low-voltage electrical energy, signals and data signals.

[0037] In addition, in this embodiment, Figure 1 As shown, a plurality of screw holes 34 are provided at the covering contact portions of the first part 11 and the second part 12. In this embodiment, the first part 11 and the second part 12 can be fixedly connected by matching the bolts and the screw holes 34, thereby achieving a fixed connection.

[0038] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the battery case 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the battery case 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0039] Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0040] Please refer to Figure 2 , Figure 2 2 is a schematic diagram of the exploded structure of an embodiment of a battery cell provided by the present application. A battery cell 20 refers to the smallest unit that constitutes a battery. Figure 2 The battery cell 20 includes an end cover 21, a shell 22, an electrode assembly 23 and other functional components.

[0041] The end cap 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the shell 22 to match the shell 22. Optionally, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 21 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 21a can be provided on the end cap 21. The electrode terminal 21a can be used to electrically connect with the electrode assembly 23 for outputting or inputting electrical energy of the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap 21 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose special restrictions on this. In some embodiments, an insulating member may be provided inside the end cap 21, and the insulating member may be used to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0042] The shell 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte and other components. The sensor can be arranged at the bottom of the shell 22, for example, at the corner of the shell 22. The shell 22 and the end cap 21 can be independent components, and an opening can be set on the shell 22, and the internal environment of the battery cell 20 can be formed by covering the opening with the end cap 21 at the opening. Without limitation, the end cap 21 and the shell 22 can also be integrated. Specifically, the end cap 21 and the shell 22 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell 22, the end cap 21 covers the shell 22. The shell 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the electrode assembly 23. The shell 22 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0043] The electrode assembly 23 is a component in the battery cell 100 where electrochemical reactions occur. One or more electrode assemblies 23 may be included in the housing 22. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly, and the parts of the positive and negative electrode sheets without active materials each constitute a tab 23a. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 23a connects the electrode terminals to form a current loop.

[0044] See also Figure 3 , Figure 3 Schematic diagram of the structure of an embodiment of a battery waterproof testing system provided by the present application. Figure 3 As shown, the present application further provides a battery waterproof testing system. The battery waterproof testing system 300 includes a central control module 310, an appearance detection module 320, a primary air tightness detection module 330, an insulation detection module 340, a secondary air tightness detection module 350 and a test container 200.

[0045] like Figure 3As shown, the central control module 310 is respectively connected to the appearance detection module 320, the primary airtightness detection module 330, the insulation detection module 340, the secondary airtightness detection module 350 and the test container 200, wherein the appearance detection module 320 can be used to perform an appearance detection on the battery to obtain the appearance information of the battery; the primary airtightness detection module 330 can be used to perform a preliminary airtightness detection on the battery; the insulation detection module 340 can be used to perform an insulation detection on the battery; the secondary airtightness detection module 350 can be used to perform a secondary airtightness detection on the battery; when the battery undergoes the above-mentioned detection and passes, the battery can be controlled to be immersed in the water of the test container 200 for a subsequent waterproof test.

[0046] In one application scenario, the central control module 310 can control the appearance inspection module 320, the primary airtightness inspection module 330, the insulation inspection module 340, the secondary airtightness inspection module 350 to work and control the flow of water in the test container 200. The battery can also be submerged in the water of the test container 200 by controlling a robotic arm or the like.

[0047] See also Figure 4 , Figure 4 Schematic diagram of the structure of an embodiment of the test container provided by the present application. Figure 4 As shown, the test container 200 of the present application includes a water tank 210 , a support tray 220 , a hydraulic column 230 , a booster pump 240 , a water spray port 250 , a drain port 260 , a sensor assembly 270 and a controller 280 .

[0048] In this embodiment, the size of the water tank 210 can cover the battery to be tested with a size of 3*2*0.5m; in other embodiments, the size of the water tank 210 can also be set based on actual needs.

[0049] like Figure 4As shown, four hydraulic columns 230 are provided at the four corners below the bracket tray 220. By adjusting the height of the hydraulic columns 230 respectively, the battery 100 can be locked and fixed, and the tilting and twisting state of 0~30° in the vertical direction and 0~30° in the horizontal direction can be achieved; the booster pump 240 can provide a water flow impact with a flow rate of 0~50km / h; the water nozzle 250 in this embodiment is detachable, and the water nozzles of different sizes can be disassembled and replaced to achieve synchronous flow of 0~1000mm water depth; the drain outlet 260 can return the water of the water tank 210 to the booster pump 240 to achieve water circulation; the sensor assembly 270 is arranged at the bottom of the water tank 210, wherein the sensor assembly 270 in this embodiment can be set as a flow rate sensor to monitor the flow rate of the water flow in real time, and the sensor assembly 270 can also be set as a pressure sensor to monitor the water pressure in real time. The function of the sensor assembly 270 is to ensure that the flow rate during the test is stable at the set value. In addition, the controller 280 is used to execute any battery waterproof test method provided in this application.

[0050] See also Figure 5 , Figure 5 1 is a flow chart of the first embodiment of the battery waterproof test method provided by the present application. The battery waterproof test method provided by the present application may include the following steps S101 to S102. Step S101: Control the flow of water in the test container to flush the battery to be tested submerged in the water in the test container. Step S102: In response to the end of flushing, perform a performance test on the battery to be tested to determine the waterproof performance of the battery to be tested.

[0051] The battery waterproof test method provided in the present application can use the battery waterproof test system 300 to perform a waterproof test on the battery 100. The battery 100 can be any of the above, such as a pack including a controller, or a battery cell, a battery module or a battery module.

[0052] In this embodiment, the battery to be tested may be the battery 100 described above. When the battery to be tested is immersed in water in the test container 200, the battery to be tested may be fixed in place by bolts through the mounting assembly. Figure 4 The support tray 220 shown in the figure (for example, the central control module 310 can control the robot arm to operate the installation assembly) ensures that the battery to be tested will not be moved by the impact of water. In addition, after the test battery is installed, water can be injected into the water tank 210 of the test container 200 to make the battery to be tested submerged in water.

[0053] At this time, the hydraulic column 230 can be used to adjust the tilt angle and / or twisting degree (i.e., the placement state) of the battery to be tested, and the boost pump 240 can be controlled to work, so as to flush the battery to be tested, so as to simulate the actual scenario of wading when the battery to be tested is installed on the whole vehicle. After the flushing of the battery to be tested is completed, the waterproof performance of the battery to be tested is tested to determine the waterproof performance of the battery to be tested.

[0054] Wherein, controlling the flow of water in the test container includes: controlling the flow speed and flow duration of the water in the test container.

[0055] In this embodiment, the controller 280 of the test container 200 can be used to set the flow speed and flow time of the water when the booster pump 240 flushes. For example, the booster pump 240 can set the flow speed of the water to 30 km / h and the flow time to 10 minutes (this condition is derived from the vehicle test standard Shanghai local standard DB31T634). In other cases, the booster pump 240 can also adjust the flow speed and flow time of the water based on the wading conditions of the actual scene.

[0056] In addition, if the sensor component 270 is a flow rate sensor, this embodiment can also monitor the flow rate of water in real time through the sensor component 270 of the test container 200, thereby realizing feedback control of the flow rate of water, so as to accurately regulate the flow rate of water and ensure that the flow rate during the test process is stable at the set value.

[0057] Among them, controlling the flow rate of water in the test container includes: obtaining the water depth of the battery to be tested in the test container; and controlling the water pressure of the water in the test container based on the water depth to control the flow rate of water in the test container.

[0058] Among them, in this embodiment, when controlling the flow rate of water in the test container 200, the flow rate of water can be controlled by pressure, that is, the sensor component 270 can be set as a pressure sensor, and the water depth of the battery to be tested in the test container 200 can be obtained; at this time, after obtaining the water depth and water pressure, the flow rate of water can be calculated through a preset mapping relationship, thereby realizing the control of the flow rate of water in the test container by controlling the water pressure.

[0059] For example, when performing a flushing test on a battery to be tested, the front end pressure of the battery to be tested can be set to approximately 35N, and the water flow time can be set to 10 minutes (this condition is equivalent to the whole vehicle test standard Shanghai local standard DB31T634).

[0060] In the above scheme, the present application can perform a flushing test on the battery to be tested by controlling the water flow in the test container 200, thereby completing the wading test of the entire vehicle at the battery level, and accurately obtaining the waterproof performance of the battery under wading conditions. In addition, when controlling the water flow in the test container 200, the present application can also control the water flow rate and flow duration to simulate the state of water when the battery to be tested is installed in the vehicle and wading, and control the water pressure in the test container 200 by the water depth, so as to control the water flow rate in the test container 200 by controlling the water pressure, thereby improving the accuracy of the battery waterproof test.

[0061] In some embodiments, flushing the battery to be tested submerged in water in the test container includes: at least one of accelerated flushing, uniform flushing, and decelerated flushing.

[0062] In this embodiment, the controller 280 can also control the boost pump 240 to perform accelerated flushing, uniform flushing, or decelerated flushing, thereby simulating the battery to be tested installed on the vehicle passing through the wading area at an accelerated, uniform, or decelerated speed. In other embodiments, the controller 280 further controls the boost pump 240 to make the flow speed of water change irregularly, thereby simulating the actual scene of the battery to be tested passing through the wading area at an irregularly changing speed.

[0063] In the above scheme, the controller 280 controls the boost pump 240 to perform accelerated flushing, uniform flushing or decelerated flushing, which can simulate the actual scenario of the battery to be tested wading at different speeds, thereby improving the accuracy of the battery waterproof test.

[0064] In some embodiments, the water pressure is the sum of a first preset proportional value of the water depth, a second preset proportional value of the flow velocity, and a preset value.

[0065] As mentioned above, in this application, the present application designs and builds a test platform, designs experiments, collects data of different flow rates and pressures, and obtains the mapping relationship between water pressure and flow velocity in the test container in the previous text of this application by fitting the curve. In the test container 200 of this embodiment, the water pressure is the sum of the first preset ratio value of the water depth, the second preset ratio value of the flow velocity, and the preset value. The mapping relationship is shown in the following formula:

[0066] F=1.1541v+0.006972h+0.119

[0067] Among them, F represents water pressure in Newton, v represents flow velocity in km / h, and h represents water depth in m.

[0068] In the above solution, the flow rate of water in the test container 200 can be calculated based on the water pressure and the water depth through the preset mapping relationship, so that the flow rate of water in the test container 200 can be controlled by pressure control.

[0069] In some embodiments, before the step of controlling the flow of water in the test container to flush the battery to be tested submerged in the water in the test container, the battery waterproof testing method further includes: adjusting the placement state of the battery to be tested in the water; wherein different placement states have different tilt angles and / or twisting degrees.

[0070] As described above, before controlling the water flow in the test container 200 to flush the battery to be tested submerged in the water in the test container 200, the battery to be tested can be fixed to the test container 200 by bolts through the mounting assembly. Figure 4 On the support tray 220 shown, ensure that the battery to be tested will not be moved by the impact of water, and inject water into the water tank 210 to submerge the battery to be tested in the water. After the test battery is submerged in the water in the test container 200, the height of the four hydraulic columns 230 can be adjusted to adjust the tilt angle and / or twist of the battery to be tested so that the battery to be tested reaches a corresponding placement state.

[0071] For example, the controller 280 can adjust the two hydraulic columns 230 away from the drain outlet 260 to be higher than the two hydraulic columns 230 close to the drain outlet 260, so that the battery to be tested is in a state of tilting downward at a first preset angle, simulating an actual scene of the battery to be tested passing through a flooded area on a downhill section of a road with a first preset angle; the controller 280 can also adjust the levels of the four hydraulic columns 230 or the different telescopic heights of the four hydraulic columns 230 to simulate the actual scene of the whole vehicle passing through a flooded area on an uneven road when the battery to be tested is installed on the whole vehicle. The controller 280 can also adjust the two hydraulic columns 230 away from the drain outlet 260 to be lower than the two hydraulic columns 230 close to the drain outlet 260, so that the battery to be tested is in a state of tilting upward at a second preset angle, simulating an actual scene of the battery to be tested passing through a flooded area and discharging water.

[0072] In the above scheme, by adjusting the placement state of the battery to be tested in the water, the actual scene of the battery to be tested wading in water at different inclination angles can be simulated.

[0073] In some embodiments, adjusting the placement state of the battery to be tested in water includes: adjusting the battery to be tested to tilt downward at a first preset angle, so as to adjust the battery to be tested to a submerged state.

[0074] As described above, before flushing the battery to be tested, the placement state of the battery to be tested in the water can be adjusted. The battery to be tested can be first adjusted to tilt downward at a first preset angle to adjust the battery to be tested to a submerged state. Adjusting the battery to be tested to tilt downward at the first preset angle means adjusting the two hydraulic columns 230 away from the drain port 260 to be higher than the two hydraulic columns 230 close to the drain port 260 as described above. In this embodiment, the first preset angle can be 15°, and in other embodiments, the first preset angle can be set based on actual needs.

[0075] In the above solution, by adjusting the battery to be tested to tilt downward at the first preset angle, an actual scene in which the battery to be tested passes through a water-logged area on a downhill section at the first preset angle can be simulated.

[0076] In some embodiments, adjusting the placement state of the battery to be tested in water includes: adjusting the distortion of the battery to be tested to adjust the battery to be tested to a submerged state.

[0077] As described above, before flushing the battery to be tested, the placement state of the battery to be tested in water is adjusted, and the distortion of the battery to be tested can be adjusted again to adjust the battery to be tested to a submerged state. Adjusting the distortion of the battery to be tested is to adjust the level of the four hydraulic columns 230 or the telescopic heights of the four hydraulic columns 230 to be different as described above.

[0078] In the above scheme, by adjusting the distortion of the battery to be tested, it is possible to simulate the actual scenario in which the vehicle passes through a flooded area on an uneven road when the battery to be tested is installed on the vehicle.

[0079] In some embodiments, adjusting the placement state of the battery to be tested in water includes: adjusting the battery to be tested to tilt upward at a second preset angle, so as to adjust the battery to be tested to be in a water-out state.

[0080] As described above, before flushing the battery to be tested, the placement state of the battery to be tested in the water is adjusted, and the battery to be tested can be adjusted to tilt upward at a second preset angle to adjust the battery to be tested to a water outlet state. Adjusting the battery to be tested to tilt upward at the second preset angle means adjusting the two hydraulic columns 230 away from the drain port 260 to be lower than the two hydraulic columns 230 close to the drain port 260 as described above. In this embodiment, the second preset angle can also be 15°, and in other embodiments, the second preset angle can also be set based on actual needs.

[0081] In the above solution, by adjusting the battery to be tested to tilt upward to the second preset angle, an actual scene of the battery to be tested passing through a water-accumulated area and being out of water can be simulated.

[0082] In some embodiments, before the step of controlling the flow of water in the test container to flush the battery to be tested submerged in the water in the test container, the battery waterproof testing method further includes: performing an initial performance test on the battery to be tested that is not submerged in water to obtain a first performance parameter; in response to the first performance parameter reaching a first preset requirement, executing the step of controlling the flow of water in the test container to flush the battery to be tested submerged in the water in the test container.

[0083] Among them, before the battery to be tested is subjected to the flushing waterproof test, the present embodiment can use the battery waterproof test system 300 to perform an initial performance test on the battery to be tested that is not submerged in water. In the present embodiment, the performance test includes appearance test, air tightness test and insulation test, etc. The appearance test is to test the appearance of the battery to be tested. If there is no appearance defect, it meets the preset requirements and an air tightness test is performed. During the air tightness test, an air tightness tester can be used to test the battery to be tested. If the air tightness test requirements are met, the insulation test of the battery to be tested is continued. If the battery to be tested meets the requirements of the above-mentioned tests, it is determined that the first performance parameter of the battery to be tested meets the first preset requirement. At this time, the interference of other factors on the waterproof test can be reduced, and the step of submerging the battery in the water of the test container 200 is executed.

[0084] In the above scheme, by performing an initial performance test on the battery to be tested that is not submerged in water, the interference of the battery to be tested that does not meet the first performance parameter on the waterproof test can be reduced, thereby improving the accuracy of the waterproof test.

[0085] In some embodiments, performing an initial performance test on the battery to be tested that has not been submerged in water includes: performing an appearance test, an initial air tightness test, an insulation test, and a secondary air tightness test on the battery to be tested that has not been submerged in water.

[0086] As mentioned above, performance testing includes appearance testing, air tightness testing and insulation testing. In this embodiment, two air tightness tests are performed. The steps of performing an initial performance test on the battery to be tested that is not submerged in water include: performing an appearance test, an initial air tightness test, an insulation test and a secondary air tightness test on the battery to be tested.

[0087] Among them, in this embodiment, the battery waterproof testing system 300 can control the appearance inspection module 320 through the central control module 310 to inspect the appearance of the battery to be tested, mainly including the inspection of the explosion-proof valve, high-voltage connectors, low-voltage connectors and bolts of the battery to be tested; after the appearance inspection, the battery waterproof testing system 300 can control the initial airtightness inspection module 330 through the central control module 310 to perform box airtightness inspection and water cooling system airtightness inspection on the battery to be tested. The box airtightness inspection is to use an airtightness detector to implement the box airtightness inspection through three steps of inflation, voltage stabilization and measurement. The inflation pressure and inflation time can be calculated based on the free volume inside the battery to be tested. The pressure is generally set to 2.5~3.5kPa, the inflation time is generally set to 200s~800s, and the voltage stabilization time and measurement time are generally set to 60s. The air tightness test of the water cooling system also uses an air tightness tester, and can also be achieved through three steps of inflation, pressure stabilization and measurement. The inflation pressure is generally set to 300~350kPa, the inflation time is generally set to 60~180s, and the pressure stabilization and measurement time is generally set to 60s.

[0088] After the initial airtightness test, the battery waterproof testing system 300 can control the insulation detection module 340 through the central control module 310 to perform insulation detection on the battery to be tested, that is, according to the voltage of the battery to be tested itself, select a suitable test voltage (generally 1.5 times the nominal voltage of the battery or 1000V) for testing. The detection time is generally 60~120s, and the test positions include insulation detection of the positive electrode of the battery to be tested to the shell, insulation detection of the negative electrode of the battery to be tested to the shell, insulation detection of the shell of the battery to be tested to the positive electrode, and insulation detection of the shell of the battery to be tested to the negative electrode.

[0089] In addition, in this embodiment, after the battery to be tested passes the above-mentioned test, the battery waterproof test system 300 can also control the secondary air-tightness test module 350 through the central control module 310 to perform a secondary air-tightness test on the battery to be tested. The process of the secondary air-tightness test is described below and is not described in detail here. The secondary air-tightness test is set in this embodiment to further reduce the interference of the battery to be tested with air-tightness defects on the waterproof test. Only when the battery to be tested undergoes appearance inspection, primary air-tightness inspection, insulation inspection and secondary air-tightness inspection and passes them respectively, can a waterproof test be performed.

[0090] In the above scheme, by performing appearance inspection, primary air tightness inspection, insulation inspection and secondary air tightness inspection on the battery to be tested, the interference of the battery to be tested with appearance defects, air tightness defects or insulation defects on the waterproof test can be reduced, thereby improving the accuracy of the waterproof test.

[0091] In some embodiments, performing a secondary airtightness test on a battery includes: filling a nitrogen-hydrogen mixed gas into the interior of the battery to be tested; performing an airtightness test on a preset position of the battery to be tested to determine the airtightness of the preset position; wherein the preset position includes at least the installation position of at least one of an explosion-proof valve, a high-voltage connector, a low-voltage connector, and a bolt.

[0092] Among them, in this embodiment, when the battery waterproof test system 300 uses the secondary air tightness detection module 350 to perform a secondary air tightness test on the battery to be tested, it is first necessary to fill the interior of the battery to be tested with nitrogen-hydrogen mixed gas, and use external air to inflate the interior of the battery to be tested. After the internal filling of the battery to be tested is completed, the secondary air tightness detection module 350 can use a hydrogen detection probe to detect the key positions of the battery to be tested, and the key positions include but are not limited to explosion-proof valves, high-voltage connectors, low-voltage connectors, bolts and other positions. At this time, the hydrogen detection probe can be used to detect hydrogen at these positions, wherein the hydrogen alarm value can be set to 5*10-4Pa·m3 / s. In other embodiments, the hydrogen alarm value can also be set based on actual conditions. When the detection alarm is triggered, it means that the hydrogen leakage at this position exceeds the standard. At this time, it is necessary to use the bubble method to confirm whether the position is leaking again; if it is determined that the position is leaking, the position can be repaired, and after the repair is completed, the battery to be tested can be subjected to subsequent waterproofing tests.

[0093] In addition, in other embodiments, other gases may be used for secondary air tightness detection, as long as the function of air tightness detection is met.

[0094] In the above scheme, by performing a secondary airtightness test at a preset position of the battery to be tested, the interference of the battery to be tested with airtightness defects on the waterproof test can be further reduced, thereby further improving the accuracy of the waterproof test.

[0095] In some embodiments, before the step of controlling the flow of water in the test container to flush the battery to be tested submerged in the water in the test container, the battery waterproof testing method further includes: adding a color developer into the water.

[0096] As described above, before the step of controlling the water flow in the test container 200 to flush the battery to be tested submerged in the water in the test container 200, the battery to be tested needs to be installed in the test container 200 and submerged in the water in the test container 200. When the battery to be tested is submerged in the water in the test container 200, the battery to be tested can be fixed in place by bolts through the installation assembly. Figure 4 The support tray 220 shown ensures that the battery to be tested will not be moved by water impact. After flushing the battery to be tested, it is necessary to determine whether water has entered the battery to be tested. However, water is colorless and tasteless and difficult to identify. Therefore, a color developer needs to be added to the water.

[0097] In the above scheme, by adding a color developer to water, the efficiency of subsequent inspection of whether water has entered the battery can be improved.

[0098] In some embodiments, in response to the end of flushing, a performance test is performed on the battery to determine the waterproof performance of the battery to be tested, including: in response to the end of flushing, checking whether water has entered the battery; if no water has entered, determining that the test has passed; if water has entered, determining that the test has failed.

[0099] Among them, after the battery to be tested has undergone the above-mentioned flushing, it is necessary to take the battery to be tested out of the water in the test container 200, and then it can be checked whether water has entered the battery to be tested; if a color developer has been added to the water before, the upper cover of the battery to be tested can be opened and the interior of the battery to be tested can be irradiated with a ultraviolet light. If color is displayed, it is determined whether water has entered the battery; if no color is displayed, it is determined that water has not entered the battery to be tested. If water has not entered the battery, it can be determined that the waterproof test has passed; if water has entered the battery, it is determined that the waterproof test has failed.

[0100] In the above scheme, through the battery-level waterproof test, this embodiment can check whether water has entered the battery without performing an actual water wading test, thereby improving the efficiency of the waterproof test.

[0101] In some embodiments, before checking whether water has entered the battery, in response to the end of flushing, the step of performing a performance test on the battery to be tested to determine the waterproof performance of the battery to be tested also includes: performing a secondary performance test on the battery to be tested to obtain a second performance parameter; in response to the second performance parameter reaching a second preset requirement, executing the step of checking whether water has entered the battery.

[0102] In this embodiment, after the battery to be tested is taken out of the water in the test container 200 and before checking whether water has entered the battery, a secondary performance test may be performed on the battery to be tested, wherein the process and steps of the secondary performance test are the same as those of the primary performance test, but the secondary performance test only requires appearance inspection, primary air tightness inspection, and insulation inspection, and there is no need to perform a secondary air tightness inspection. If the secondary performance test of the battery to be tested meets the second preset requirement, the step of checking whether water has entered the battery is performed.

[0103] In the above scheme, by performing a secondary performance test on the battery to be tested after flushing, the interference of other factors on the waterproof test of the battery to be tested can be reduced.

[0104] In some embodiments, see Figure 6 , Figure 6 2 is a flow chart of the second embodiment of the battery waterproof testing method provided by the present application. Figure 6 As shown, the battery waterproof testing method provided in this embodiment may include the following steps S201 to S204:

[0105] Step S201: performing an initial performance test on a battery to be tested that is not submerged in water to obtain a first performance parameter.

[0106] Before performing a flushing waterproof test on the battery to be tested, this embodiment can use the battery waterproof test system 300 to perform an initial performance test on the battery to be tested that is not submerged in water. The performance test includes appearance test, air tightness test and insulation test, etc. The appearance test is to test the appearance of the battery to be tested. If there is no appearance defect, it meets the preset requirements and an air tightness test is performed. During the air tightness test, an air tightness tester can be used to test the battery to be tested. If the air tightness test requirements are met, the insulation test of the battery to be tested is continued. If the battery to be tested meets the requirements of the above tests, it is determined that the first performance parameter of the battery to be tested meets the first preset requirement. At this time, in response to the first performance parameter meeting the first preset requirement, the process goes to step S202.

[0107] In this embodiment, the secondary airtightness test of the battery to be tested that has not been submerged in water includes: performing appearance test, primary airtightness test, insulation test and secondary airtightness test on the battery to be tested that has not been submerged in water.

[0108] Among them, in this embodiment, the battery waterproof testing system 300 can control the appearance inspection module 320 through the central control module 310 to inspect the appearance of the battery to be tested, mainly including the inspection of the explosion-proof valve, high-voltage connectors, low-voltage connectors and bolts of the battery to be tested; after the appearance inspection, the battery waterproof testing system 300 can control the initial airtightness inspection module 330 through the central control module 310 to perform box airtightness inspection and water cooling system airtightness inspection on the battery to be tested. The box airtightness inspection is to use an airtightness detector to implement the box airtightness inspection through three steps of inflation, voltage stabilization and measurement. The inflation pressure and inflation time can be calculated based on the free volume inside the battery to be tested. The pressure is generally set to 2.5~3.5kPa, the inflation time is generally set to 200s~800s, and the voltage stabilization time and measurement time are generally set to 60s. The air tightness test of the water cooling system also uses an air tightness tester, and can also be achieved through three steps of inflation, pressure stabilization and measurement. The inflation pressure is generally set to 300~350kPa, the inflation time is generally set to 60~180s, and the pressure stabilization and measurement time is generally set to 60s.

[0109] After the initial airtightness test, the battery waterproof testing system 300 can control the insulation detection module 340 through the central control module 310 to perform insulation detection on the battery to be tested, that is, according to the voltage of the battery to be tested itself, select a suitable test voltage (generally 1.5 times the nominal voltage of the battery or 1000V) for testing. The detection time is generally 60~120s, and the test positions include insulation detection of the positive electrode of the battery to be tested to the shell, insulation detection of the negative electrode of the battery to be tested to the shell, insulation detection of the shell of the battery to be tested to the positive electrode, and insulation detection of the shell of the battery to be tested to the negative electrode.

[0110] In some embodiments, please refer to FIG. Figure 7 yes Figure 6 Schematic diagram of the process of step S201 in an embodiment. This embodiment can be performed as follows Figure 7 The method shown implements the step of performing a secondary air tightness test on the test battery that is not submerged in water in step S201, and the specific implementation steps include steps S301 to S302:

[0111] Step S301: filling the interior of the battery to be tested with nitrogen-hydrogen mixed gas.

[0112] In this embodiment, when the battery waterproof testing system 300 uses the secondary airtightness detection module 350 to perform a secondary airtightness detection on the battery to be tested, it is first necessary to fill the interior of the battery to be tested with a nitrogen-hydrogen mixed gas, and then use external air to inflate the interior of the battery to be tested. In addition, in other embodiments, other gases can also be used for secondary airtightness detection, as long as the airtightness detection function is met.

[0113] Step S302: performing airtightness detection on a preset position of the battery to be tested to determine the airtightness of the preset position; wherein the preset position at least includes the installation position of at least one of the explosion-proof valve, the high-voltage connector, the low-voltage connector, and the bolt.

[0114] After the internal inflation of the battery to be tested is completed, the secondary airtightness detection module 350 can use the hydrogen detection probe to perform hydrogen detection on these positions, wherein the hydrogen alarm value can be set to 5*10-4Pa·m3 / s. In other embodiments, the hydrogen alarm value can also be set based on the actual situation. When the detection alarm is triggered, it means that the hydrogen leakage at this position exceeds the standard. At this time, it is necessary to use the bubble method to confirm whether the position is leaking again; if it is determined that the position is leaking, the position can be repaired, and after the repair is completed, the battery to be tested can be subjected to subsequent waterproof testing.

[0115] Step S202: Control the water flow in the test container to flush the battery to be tested submerged in the water in the test container.

[0116] In this embodiment, after the initial performance test of the battery to be tested is completed and the first performance parameter reaches the first preset requirement, the battery to be tested can be fixed to the battery by bolts through the installation assembly. Figure 4 The support tray 220 shown in the figure ensures that the battery to be tested will not be moved by the impact of water. In addition, after the test battery is installed, water can be poured into the water tank 210 of the test container 200 to make the battery to be tested submerged in water.

[0117] After the battery to be tested is immersed in the water in the test container, the water flow in the test container can be controlled to flush the battery to be tested with water of different flow speeds and flow durations.

[0118] Among them, controlling the flow of water in the test container includes: controlling the flow speed and flow duration of the water in the test container. In this embodiment, the controller 280 of the test container 200 can be used to set the flow speed and flow duration of the water when the booster pump 240 flushes. For example, the booster pump 240 can set the flow speed of the water to 30km / h and the flow time to 10min (this condition is derived from the vehicle test standard Shanghai Local Standard DB31T634). In other cases, the booster pump 240 can also adjust the flow speed and flow duration of the water based on the wading conditions of the actual scene.

[0119] The flushing of the battery to be tested submerged in the water in the test container includes at least one of accelerated flushing, uniform flushing and decelerated flushing.

[0120] In this embodiment, the controller 280 can also control the boost pump 240 to perform accelerated flushing, uniform flushing, or decelerated flushing, thereby simulating the battery to be tested installed on the vehicle passing through the wading area at an accelerated, uniform, or decelerated speed. In other embodiments, the controller 280 further controls the boost pump 240 to make the flow speed of water change irregularly, thereby simulating the actual scene of the battery to be tested passing through the wading area at an irregularly changing speed.

[0121] In some embodiments, see Figure 8 , Figure 8 yes Figure 6 Schematic diagram of the process of step S202 in an embodiment. This embodiment can be performed as follows Figure 8 The method shown implements the step of controlling the flow rate of water in the test container in step S202, and the specific implementation steps include steps S401 to S402:

[0122] Step S401: obtaining the water depth of the battery to be tested in the test container.

[0123] In this embodiment, the flow rate of water in the test container can be controlled by pressure control. Before using the pressure control method to control the flow rate of water in the test container, the present application found that the water pressure is the sum of the first preset proportional value of the water depth, the second preset proportional value of the flow rate, and the preset value. At this time, the present application designed and built a test platform, designed experiments, collected data of different flow rates and pressures, and obtained the mapping relationship between the water pressure and the flow rate in the test container in the previous text of the present application by fitting the curve. Among them, the mapping relationship is shown in the following formula:

[0124] F=1.1541v+0.006972h+0.119

[0125] Wherein, F represents water pressure in Newton, v represents flow velocity in km / h, and h represents water depth in m. The above mapping relationship is only the mapping relationship between water pressure and flow velocity in the test container of this application. In the test container of other embodiments, the data of the above mapping relationship can be obtained by refitting.

[0126] At this time, the sensor assembly in the test container can be set as a pressure sensor to obtain the water depth of the battery to be tested in the test container.

[0127] Step S402: Control the water pressure of the water in the test container based on the water depth to control the flow rate of the water in the test container.

[0128] After obtaining the water pressure through the pressure sensor and obtaining the water depth of the battery to be tested in the test container, the water flow rate can be calculated through a preset mapping relationship, thereby controlling the water flow rate in the test container by controlling the water pressure.

[0129] Step S203: adjusting the placement state of the battery to be tested in water; wherein different placement states have different tilt angles and / or twisting degrees.

[0130] like Figure 4 As shown, the battery to be tested is fixed to the bracket tray 220 with bolts to ensure that the battery to be tested will not be moved by water impact, and after water is injected into the water tank 210, the height of the water is higher than the battery to be tested. At this time, the height of the four hydraulic columns 230 can be adjusted to adjust the inclination angle and / or distortion of the battery to be tested so that the battery to be tested reaches a corresponding placement state.

[0131] In some embodiments, adjusting the placement state of the battery to be tested in water includes: adjusting the battery to be tested to tilt downward at a first preset angle, so as to adjust the battery to be tested to a submerged state.

[0132] For example, the controller 280 can adjust the two hydraulic columns 230 away from the drain outlet 260 to be higher than the two hydraulic columns 230 close to the drain outlet 260, so that the battery to be tested is in a state of tilting downward at a first preset angle, simulating the actual scene of the battery to be tested passing through a flooded area on a downhill section with a first preset angle.

[0133] In some embodiments, adjusting the placement state of the battery to be tested in water further includes: adjusting the distortion of the battery to be tested to adjust the battery to be tested to a submerged state.

[0134] For example, the controller 280 can adjust the levels of the four hydraulic columns 230 or the telescopic heights of the four hydraulic columns 230 to be different, simulating an actual scenario in which the vehicle passes through a flooded area on an uneven road when the battery to be tested is installed on the vehicle.

[0135] In some embodiments, adjusting the placement state of the battery to be tested in water further includes: adjusting the battery to be tested to tilt upward at a second preset angle, so as to adjust the battery to be tested to be in a water-out state.

[0136] For example, the controller 280 can adjust the two hydraulic columns 230 away from the drain outlet 260 to be lower than the two hydraulic columns 230 close to the drain outlet 260, so that the battery to be tested is in a state of tilting upward at a second preset angle, simulating the actual scene of the battery to be tested passing through the flooded area and discharging water.

[0137] In other embodiments, the placement state of the battery to be tested in water may be adjusted while the water flow in the test container is controlled to flush the battery to be tested.

[0138] Step S204: in response to the flushing being completed, a performance test is performed on the battery to be tested to determine the waterproof performance of the battery to be tested.

[0139] After the battery to be tested is flushed with water, the waterproof performance of the battery to be tested can be tested, and the battery to be tested can be opened to observe whether water has entered the interior of the battery to be tested, thereby determining the waterproof performance of the battery to be tested.

[0140] In some embodiments, based on the above embodiments, please refer to Fig. 9 , Fig. 9 yes Figure 6 Schematic diagram of the process of step S204 in an embodiment. This embodiment can be performed as follows Fig. 9 The method shown implements step S204, and the specific implementation steps include steps S501 to S504:

[0141] Step S501: performing a secondary performance test on the battery to be tested to obtain a second performance parameter, and determining whether the second performance parameter meets a second preset requirement.

[0142] In this embodiment, after the battery to be tested has been flushed in the previous embodiment, it is necessary to take the battery to be tested out of the water in the test container and perform a secondary performance test on the battery to be tested, wherein the process and steps of the secondary performance test are the same as those of the initial performance test, but the secondary performance test only requires appearance inspection, initial air tightness test, and insulation test, and there is no need to perform a secondary air tightness test. If the second performance parameter of the battery to be tested meets the second preset requirement, go to step S502.

[0143] Step S502: Check whether water has entered the battery.

[0144] If the second performance parameter of the battery to be tested taken out from the water in the test container reaches the second preset requirement, it is then checked whether water has entered the battery to be tested.

[0145] If not, go to step S503; if yes, go to step S504.

[0146] Step S503: Determine whether the test has passed.

[0147] In response to the fact that water has not entered the battery under test, it is determined that the waterproof test of the battery under test has passed.

[0148] Step S504: determine that the test fails.

[0149] In response to water entering the battery under test, it is determined that the waterproof test of the battery under test fails.

[0150] In some embodiments, based on Figure 6 In this embodiment, in Figure 6 In the embodiment, a color developer may be added to the water before step S202. If a color developer is added to the water before, the upper cover may be opened and the interior of the battery to be tested may be illuminated with a UV light when detecting whether the battery to be tested has been flooded. If color is developed, it is determined whether water has entered the battery; if no color is developed, it is determined that water has not entered the battery to be tested. If water has not entered the battery, it is determined that the waterproof test has passed; if water has entered the battery, it is determined that the waterproof test has failed.

[0151] The beneficial effects of the above embodiments have been described in the previous text and will not be repeated here.

[0152] In the several embodiments provided in the present application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device implementation described above is only schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation, such as units or components can be combined or integrated into another subsystem, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0153] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or part of the contribution to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (processor) to perform all or part of the steps of each implementation method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program code.

Claims

1. A battery waterproof testing method, characterized in that: The battery waterproof testing method comprises: Control the appearance inspection module, the primary air tightness inspection module, the insulation inspection module, and the secondary air tightness inspection module to perform appearance inspection, primary air tightness inspection, insulation inspection, and secondary air tightness inspection on the battery to be tested that is not submerged in water, so as to obtain the first performance parameter; adding a color developer to the water; In response to the first performance parameter reaching a first preset requirement, controlling the water in the test container to flow so as to flush the battery to be tested submerged in the water in the test container; Performing a secondary performance test on the battery to be tested to obtain a second performance parameter, wherein the secondary performance test includes the appearance test, the initial air tightness test and the insulation test; In response to the second performance parameter reaching a second preset requirement, at the end of the flushing, a performance test is performed on the battery to be tested to determine the waterproof performance of the battery to be tested; Wherein, controlling the flow of water in the test container includes: controlling the flow speed and flow duration of the water in the test container; controlling the flow speed of water in the test container includes: obtaining the water depth of the battery to be tested in the test container; controlling the water pressure of the water in the test container based on the water depth to control the flow speed of the water in the test container; wherein the mapping relationship between the water pressure and the flow speed is as follows: F=1.1541v+0.006972h+0.119 F represents water pressure in Newton, v represents flow velocity in km / h, and h represents water depth in m; Wherein, performing a secondary air tightness test on the battery to be tested that is not submerged in water comprises: Filling nitrogen-hydrogen mixed gas into the battery to be tested; Controlling the hydrogen detection probe to perform airtightness detection on a preset position of the battery to be tested; In response to the detection alarm, it is determined that the hydrogen leakage at the preset position exceeds the standard, and a bubble method is used to confirm again whether there is a leak at the preset position; Wherein, the preset position at least includes the installation position of at least one of the explosion-proof valve, the high-voltage connector, the low-voltage connector, and the bolt; In response to the second performance parameter reaching a second preset requirement, at the end of the flushing, a performance test is performed on the battery to be tested to determine the waterproof performance of the battery to be tested, including: In response to the flushing being completed, opening the upper cover of the battery to be tested and irradiating the interior of the battery to be tested with a UV light; If color is displayed, it is determined that water has entered the battery under test and the waterproof test is failed; if no color is displayed, it is determined that water has not entered the battery under test and the waterproof test is passed.

2. The battery waterproof testing method according to claim 1, characterized in that: Flushing the battery to be tested submerged in the water in the test container includes at least one of: accelerating flushing, flushing at a constant speed, and flushing at a reduced speed.

3. The battery waterproof testing method according to claim 1, characterized in that: Before the step of controlling the water flow in the test container to flush the battery to be tested submerged in the water in the test container, the battery waterproof testing method further includes: Adjusting the placement state of the battery to be tested in the water; Wherein, different placement states have different tilt angles and / or twisting degrees.

4. The battery waterproof testing method according to claim 3, characterized in that: The step of adjusting the placement state of the battery to be tested in the water includes: The battery to be tested is adjusted to tilt downward at a first preset angle, so as to adjust the battery to be tested to a submerged state.

5. The battery waterproof testing method according to claim 3, characterized in that: The step of adjusting the placement state of the battery to be tested in the water includes: The distortion of the battery to be tested is adjusted to adjust the battery to be tested to a water-free state.

6. The battery waterproof testing method according to claim 3, characterized in that: The step of adjusting the placement state of the battery to be tested in the water includes: The battery to be tested is adjusted to tilt upward to a second preset angle, so as to adjust the battery to be tested to a water outlet state.

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