Battery pack sealing detection device and sealing detection method

Abstract

The invention provides a battery pack sealing detection device and a sealing detection method, and relates to the field of battery pack sealing detection. The device is provided with the special detection box, so that the test environment can be separated from the external environment, factors such as the temperature of the test environment can be better adjusted, and the test effect is ensured. Furthermore, a lifting assembly capable of driving the battery pack to lift is arranged in the detection box, so that the battery pack can be lifted, gas is conveyed into the battery pack through the detection assembly, and whether the sealing performance of the battery pack is qualified or not can be accurately judged through related data of a controller and a display screen; furthermore, if the sealing of the battery pack fails, the leakage point of the battery pack can be accurately identified by conveying the colored gas.

Description

Technical Field

[0001] The present application relates to the field of battery pack sealing detection, and in particular to a battery pack sealing detection device and a sealing detection method. Background Art

[0002] The sealing of the battery pack is an important part of judging whether the battery pack is safe. If there is a problem with the sealing of the battery pack, when the vehicle equipped with the problematic battery pack enters the water during wading, the insulation resistance will be reduced at the very least, causing the BMS to alarm the entire vehicle, resulting in a restriction of the vehicle's power system; in serious cases, it will directly cause the battery pack to short-circuit and catch fire, posing a life-threatening danger to passengers. When a vehicle equipped with a problematic battery pack passes through a muddy road, the entry of foreign matter such as mud and sand will scratch the blue film of the battery cell casing and other parts of the battery pack, causing insulation abnormalities, and in severe cases, posing a threat of battery pack short-circuiting. Therefore, battery pack sealing testing has become an effective method to prevent battery pack airtightness problems and improve battery safety.

[0003] To prevent liquid damage and corrosion in battery packs, gas testing is currently commonly used to test the seal of battery packs. Specifically, the battery pack to be tested is placed on a workbench, and a gas-tightness tester is used to inflate the pack through an explosion-proof valve. Once the specified pressure is reached, the pressure is maintained. After a period of time, the internal pressure of the battery pack is measured to calculate the amount of gas leakage. However, this method cannot test the seal of the battery pack's bottom guard plate, making it very easy to miss a test. It also cannot identify the specific point of seal failure. Summary of the Invention

[0004] In view of this, the purpose of the present application is to provide a battery pack sealing detection device and a sealing detection method to solve the problem that the existing method for detecting the sealing of the battery pack is very prone to missed detection and cannot identify failure points.

[0005] In accordance with the above objectives, a first aspect of the present invention provides a battery pack sealing detection device, wherein the battery pack sealing detection device includes: The detection box comprises a box body and a roller door rotatably connected to the box body, the roller door being capable of rolling up or unfolding; the detection box is provided with an observation window and a ventilation component communicating with a receiving cavity of the box body; the receiving cavity can be in a connected state or a sealed state; A lifting assembly, detachably connected to the battery pack, capable of driving the battery pack to rise and fall; a detection assembly, comprising a gas source detachably connected to the battery pack so as to be capable of delivering gas to the interior of the battery pack; Display screen; A controller is communicatively connected and / or electrically connected to the lifting assembly, the detection assembly, and the display screen; the controller can feed back the pressure value in the battery pack and the oxygen concentration in the accommodating chamber to the display screen.

[0006] Preferably, the ventilation assembly includes a ventilation pipe and a first valve corresponding to the ventilation pipe; the side wall of the box body is provided with an assembly hole, and the ventilation pipe is correspondingly connected to the box body through the assembly hole; the first valve is communicatively connected or electrically connected to the controller.

[0007] Preferably, the lifting assembly includes a plurality of motors fixed to the top of the accommodating cavity, each of the motors is communicatively connected and / or electrically connected to the controller, and the controller can control the synchronous rotation of the plurality of motors.

[0008] Preferably, a chain is fixed to the outer side wall of the output shaft of each motor, and the other end of the chain is connected to a lifting ring; The outer side of the battery pack is formed with a plurality of mounting points for assembly with the vehicle, and the lifting rings are detachably connected to the mounting points; when the motor rotates, it can drive the battery pack to rise or fall.

[0009] Preferably, a support platform is further provided in the accommodating cavity, and the battery pack can be placed on top of the support platform.

[0010] Preferably, the detection assembly includes a first gas tank and a second gas tank disposed in the accommodating cavity, and the first gas tank and the second gas tank are connected to the air valve of the battery pack through an air pipe.

[0011] Preferably, the gas pipeline includes a first gas pipeline, a second gas pipeline, and a third gas pipeline connected by a tee; the other end of the first gas pipeline is connected to the breathable valve, the other end of the second gas pipeline is connected to the first gas storage tank, and the other end of the third gas pipeline is connected to the second gas storage tank; The second gas pipeline and the third gas pipeline are respectively provided with a second valve and a third valve, and the second valve and the third valve are both communicatively connected and / or electrically connected to the controller.

[0012] Preferably, the first gas storage tank is filled with oxygen; and the second gas storage tank is filled with colored safety gas. According to a second aspect of the present invention, a battery pack sealing detection method is provided, which is used in the battery pack sealing detection device as described above, wherein the battery pack sealing detection method includes the following steps: S10: rolling up the roller door to connect the battery pack to the lifting assembly, so that the battery pack is moved to an appropriate position; S20: Connecting the detection component to the battery pack; S30: unfolding the roller door and closing the ventilation assembly to seal the accommodating chamber; after a period of rest, reading the oxygen content in the accommodating chamber on the display screen as the initial oxygen content; S40: oxygen is delivered into the battery pack through the detection component, and the display screen can monitor the pressure value in the battery pack in real time. When the pressure value reaches a preset value, inflation is stopped; S50: After standing for a specified time, the pressure value at this moment is compared with the preset pressure value, and the oxygen content in the containing cavity at this moment is compared with the initial oxygen content. If both meet the requirements, it means that the battery pack sealing is qualified; if one does not meet the requirements, it means that the battery pack sealing has failed.

[0013] Preferably, in step S50, if the seal of the battery pack fails, a colored gas is delivered into the battery pack through the detection component so that the leakage point of the battery pack can be visually detected.

[0014] The battery pack seal detection device and seal detection method according to the present invention are equipped with a dedicated detection chamber, which can isolate the test environment from the external environment, thereby better adjusting the temperature and other factors of the test environment to ensure the test effect. Furthermore, a lifting assembly is installed in the detection chamber to drive the battery pack up and down. In this way, the battery pack can be lifted, and then gas is delivered to the battery pack through the detection assembly. The relevant data on the controller and display screen can accurately determine whether the battery pack seal is qualified. Furthermore, if the battery pack seal fails, the delivery of colored gas can accurately identify the leakage point of the battery pack.

[0015] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 is a partial schematic diagram of a battery pack sealing detection device according to an embodiment of the present invention; Figure 2 is a partial schematic diagram of a detection component according to an embodiment of the present invention.

[0018] Icons: 11- cabinet; 12- rolling door; 21- ventilation pipe; 31- motor; 32- chain; 33- lifting ring; 34- supporting platform; 41- first gas tank; 42- second gas tank; 43- tee; 441- first gas pipe; 442- second gas pipe; 443- third gas pipe; 451- second valve; 452- third valve; 5- battery pack; 51- installation point; 6- controller; 7- display screen. DETAILED DESCRIPTION The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein. Rather, except for operations that must occur in a particular order, changes may be made that will be apparent upon understanding the disclosure of this application. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity.

[0019] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0020] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, it may be directly “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on,” “directly connected to,” “directly coupled to,” “directly over,” or “directly covering” another element, there may be no other elements present between them.

[0021] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0022] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are used only to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, a first member, component, region, layer, or portion in the examples described herein may also be referred to as a second member, component, region, layer, or portion without departing from the teachings of the examples.

[0023] For ease of description, spatially relative terms such as "above," "upper," "below," and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatially relative terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element would subsequently be located "below" or "lower" relative to the other element. Thus, the term "above" encompasses both the orientations of "above" and "below," depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein will be interpreted accordingly.

[0024] The terms used herein are intended only to describe various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular is intended to include the plural. The terms "comprise," "include," and "have" list the presence of stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0025] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include changes in shapes that occur during manufacturing.

[0026] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0027] According to a first aspect of the present invention, a battery pack sealing detection device is provided. Figures 1 to 2As shown, the battery pack sealing detection device in this embodiment includes a detection box, which is equipped with a lifting assembly and a detection assembly to detect the sealing of the battery pack 5. In addition, the detection box is connected to a display screen 7 and a controller 6. The specific structure, connection relationship, and positional relationship of the above components of the battery pack sealing detection device according to the present invention will be described in detail below.

[0028] In this embodiment, if Figure 1 As shown, the inspection box includes a box body 11 and a roller door 12 rotatably connected to the box body 11. The box body 11 has an internal accommodating cavity formed therein and extending through a first side portion of the box body 11. The roller door 12 is correspondingly connected to the first side portion of the box body 11 and can be rolled up or unfolded. The roller door 12 is an existing component, so its operating principle and specific assembly method with the box body 11 will not be described in detail. In addition, the inspection box is also provided with an observation window (not shown in the figure, which can be located in the box body 11 or the roller door 12) to enable real-time monitoring of the situation within the box body 11.

[0029] Furthermore, a ventilation assembly is provided on the second side of the housing 11, comprising a ventilation tube 21 and a first valve connected to the ventilation tube 21. Specifically, an assembly hole is provided on the second side of the housing 11, through which the ventilation tube 21 is connected to the housing 11. The first valve is communicatively or electrically connected to a controller 6 connected to the outside of the housing 11. The roller door 12 is also communicatively or electrically connected to the controller 6. Thus, the controller 6 can control the roller door 12 to unfold and close the first valve, thereby sealing the accommodating chamber. Alternatively, the controller 6 can control the roller door 12 to roll up and open the first valve, thereby communicating with the outside world.

[0030] In this embodiment, a support platform 34 is provided at the bottom of the accommodating chamber. During preparatory work before testing, the battery pack 5 to be tested can be placed on top of the support platform 34. Furthermore, the lifting assembly includes multiple motors 31 fixed to the top of the accommodating chamber. Each motor 31 is communicatively and / or electrically connected to a controller 6, which controls the synchronous rotation of the multiple motors 31. Furthermore, a chain 32 is fixed to the outer wall of the output shaft of each motor 31, and a lifting ring 33 is connected to the other end of each chain 32. Correspondingly, the outer portion of the battery pack 5 is formed with multiple mounting points 51 (an inherent structure of the battery pack 5) for assembly with the vehicle. The lifting rings 33 are detachably connected to the mounting points 51. Thus, when the motor 31 rotates, it can wind up or release the chain 32 to correspondingly drive the battery pack 5 to rise or fall.

[0031] It should be noted that a set of motors 31, chains 32, and lifting rings 33 corresponds to a single mounting point 51. That is, the locations of these three components should correspond to the mounting point. The specifications and location of the support platform 34 should be configured to facilitate the assembly of the lifting ring 33 with the mounting point 51. Furthermore, the specific connection method between the motor 31, chain 32, and lifting ring 33 is not fixed, nor is the specific structure of the lifting ring 33. For example, the lifting ring 33 can be configured as a snap-fit ​​structure to achieve a detachable connection with the mounting point 51, as long as the aforementioned technical effects can be achieved.

[0032] In addition, in this embodiment, if Figure 2 As shown, the detection assembly includes a first gas tank 41 and a second gas tank 42 disposed within the accommodating cavity. The first gas tank 41 and the second gas tank 42 are connected to the vent valve of the battery pack 5 (an inherent structure of the battery pack 5) via gas pipes. The first gas tank 41 is filled with oxygen, and the second gas tank 42 is filled with a colored safety gas. The gas pipes include a first gas pipe 441, a second gas pipe 442, and a third gas pipe 443 connected by a tee 43. The other end of the first gas pipe 441 (away from the tee 43) is connected to the vent valve, the other end of the second gas pipe 442 is connected to the first gas tank 41, and the other end of the third gas pipe 443 is connected to the second gas tank 42. Furthermore, the second gas pipe 442 and the third gas pipe 443 are respectively provided with a second valve 451 and a third valve 452. The second valve 451 and the third valve 452 are both communicatively and / or electrically connected to the controller 6. In this way, the controller 6 can control the second valve 451 or the third valve 452 to open or close, so as to deliver oxygen or colored gas into the battery pack 5 .

[0033] In addition, a gas sensor is provided in the receiving chamber and is in communication with the controller 6 to detect the oxygen concentration in the receiving chamber. The display screen 7 can display the pressure value in the battery pack 5 and the oxygen concentration in the receiving chamber in real time.

[0034] Furthermore, a heating component and a cooling component (such as a heater and an air conditioner) may be provided in the accommodating cavity to change the temperature in the accommodating cavity, thereby testing the sealing state of the battery pack 5 under low temperature, high temperature, or temperature alternating conditions.

[0035] There is no specific limitation on the specific specifications and types of the above-mentioned valves. For example, they can be solenoid valves as long as they can achieve the above-mentioned technical effects.

[0036] According to the battery pack seal detection device described above, the device is equipped with a dedicated detection chamber, thereby isolating the test environment from the external environment, thereby better adjusting the temperature and other factors of the test environment to ensure the test effect. Furthermore, a lifting assembly is installed in the detection chamber to drive the battery pack 5 up and down. In this way, the battery pack 5 can be lifted, and then gas is delivered to the battery pack 5 through the detection assembly. The relevant data of the controller 6 and the display screen 7 can accurately determine whether the battery pack 5 is sealed. Furthermore, if the battery pack 5 seal fails, the delivery of colored gas can accurately identify the leakage point of the battery pack 5.

[0037] According to a second aspect of the present invention, a battery pack sealing detection method is provided, which is used in the battery pack sealing detection device as described above, wherein the battery pack sealing detection method includes the following steps: S10: Roll up the roller door 12 to connect the battery pack 5 to the lifting assembly, so that the battery pack 5 is moved to a proper position.

[0038] Specifically, the battery pack 5 can be placed on the top of the support platform 34 first, and then the hanging rings 33 can be connected to the installation points 51 of the battery pack 5 one by one; when the hanging rings 33 are stably connected to the battery pack 5, the motor 31 is driven to rotate through the control component to drive the battery pack 5 to rise to a suspended state.

[0039] S20: Connect the detection component to the battery pack 5.

[0040] Specifically, the first gas supply pipe 441 is connected to the battery vent valve through the battery airtightness detection component (existing component).

[0041] S30: unfold the roller door 12 and close the ventilation assembly to make the accommodating chamber in a sealed state; after standing for a period of time, read the oxygen content in the accommodating chamber from the display screen 7 as the initial oxygen content.

[0042] Specifically, the standing time is usually two minutes, and it is sufficient to observe that the oxygen content value displayed on the display screen 7 no longer changes.

[0043] S40: oxygen is delivered into the battery pack 5 through the detection component, and the display screen 7 can monitor the pressure value in the battery pack 5 in real time. When the pressure value reaches a preset value, inflation is stopped.

[0044] Specifically, the controller 6 controls the second valve 451 to open and the third valve 452 to close, and the pressure value in the battery pack 5 is obtained by calculating the oxygen delivery amount, that is, the second delivery pipe is also provided with a flow meter that is communicatively connected or electrically connected to the controller 6.

[0045] S50: After standing for a specified time, the pressure value at this moment is compared with the preset pressure value, and the oxygen content in the accommodating chamber at this moment is compared with the initial oxygen content. If both meet the requirements, it means that the sealing of the battery pack 5 is qualified; if one does not meet the requirements, it means that the sealing of the battery pack 5 has failed.

[0046] Furthermore, in step S50, if the seal of the battery pack 5 fails, colored gas is delivered to the battery pack 5 through the detection component (i.e., the second valve 451 is closed and the third valve 452 is opened). When the pressure in the battery pack 5 reaches a preset value, pressure maintenance is started, and then the leakage point of the battery pack 5 can be accurately visually detected.

[0047] If the battery pack 5 passes the seal test or a leak is detected, air is simultaneously pumped out through the vent pipe 21, the second air pipe 442 (and the first air pipe 441). When the internal pressure of the battery pack 5 and the pressure in the housing cavity return to ambient pressure, the pumping stops, and the battery pack 5 is removed from the lifting ring 33. It should be noted that, although not shown in the figure, the vent pipe 21 and the first air pipe 441 are connected to an air pump to facilitate the pumping.

[0048] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed in the present application, or replace some of the technical features therein with equivalents. Such modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be described in the scope of protection of the claims.

Claims

1. A battery pack sealing detection device, characterized in that: The battery pack sealing detection device includes: The detection box comprises a box body and a roller door rotatably connected to the box body, the roller door being capable of rolling up or unfolding; the detection box is provided with an observation window and a ventilation component communicating with a receiving cavity of the box body; the receiving cavity can be in a connected state or a sealed state; A lifting assembly, detachably connected to the battery pack, capable of driving the battery pack to rise and fall; a detection assembly, comprising a gas source detachably connected to the battery pack so as to be capable of delivering gas to the interior of the battery pack; Display screen; A controller is communicatively connected and / or electrically connected to the lifting assembly, the detection assembly, and the display screen; the controller can feed back the pressure value in the battery pack and the oxygen concentration in the accommodating chamber to the display screen.

2. The battery pack sealing detection device according to claim 1, characterized in that: The ventilation assembly includes a ventilation pipe and a first valve correspondingly connected to the ventilation pipe; the side wall of the box is provided with an assembly hole, and the ventilation pipe is correspondingly connected to the box through the assembly hole; the first valve is communicatively connected or electrically connected to the controller.

3. The battery pack sealing detection device according to claim 1, characterized in that: The lifting assembly includes a plurality of motors fixed to the top of the accommodating cavity, each of the motors is communicatively connected and / or electrically connected to the controller, and the controller can control the synchronous rotation of the plurality of motors.

4. The battery pack sealing detection device according to claim 3, characterized in that: A chain is fixed to the outer side wall of the output shaft of each motor, and the other end of the chain is connected to a lifting ring; The outer side of the battery pack is formed with a plurality of mounting points for assembly with the vehicle, and the lifting rings are detachably connected to the mounting points; when the motor rotates, it can drive the battery pack to rise or fall.

5. The battery pack sealing detection device according to claim 3, characterized in that: A support platform is also provided in the accommodating cavity, and the battery pack can be placed on top of the support platform.

6. The battery pack sealing detection device according to claim 1, characterized in that: The detection assembly includes a first gas tank and a second gas tank disposed in the accommodating cavity, and the first gas tank and the second gas tank are connected to the air valve of the battery pack through an air pipe.

7. The battery pack sealing detection device according to claim 6, characterized in that: The gas pipeline includes a first gas pipeline, a second gas pipeline, and a third gas pipeline connected by a tee; the other end of the first gas pipeline is connected to the breathable valve, the other end of the second gas pipeline is connected to the first gas storage tank, and the other end of the third gas pipeline is connected to the second gas storage tank; The second gas pipeline and the third gas pipeline are respectively provided with a second valve and a third valve, and the second valve and the third valve are both communicatively connected and / or electrically connected to the controller.

8. The battery pack sealing detection device according to claim 7, characterized in that: The first gas storage tank is filled with oxygen; the second gas storage tank is filled with colored safety gas.

9. A battery pack sealing detection method, used in the battery pack sealing detection device according to any one of claims 1 to 8, characterized in that: The battery pack sealing detection method comprises the following steps: S10: rolling up the roller door to connect the battery pack to the lifting assembly, so that the battery pack is moved to an appropriate position; S20: Connecting the detection component to the battery pack; S30: unfolding the roller door and closing the ventilation assembly to seal the accommodating chamber; after a period of rest, reading the oxygen content in the accommodating chamber on the display screen as the initial oxygen content; S40: oxygen is delivered into the battery pack through the detection component, and the display screen can monitor the pressure value in the battery pack in real time. When the pressure value reaches a preset value, inflation is stopped; S50: After standing for a specified time, the pressure value at this moment is compared with the preset pressure value, and the oxygen content in the containing cavity at this moment is compared with the initial oxygen content. If both meet the requirements, it means that the battery pack sealing is qualified; if one does not meet the requirements, it means that the battery pack sealing has failed.

10. The battery pack sealing detection method according to claim 9, characterized in that: In step S50 , if the seal of the battery pack fails, colored gas is delivered into the battery pack through the detection component so that the leakage point of the battery pack can be visually detected.

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