Method and apparatus for detecting the air tightness of a battery device

Abstract

This application discloses a method and apparatus for airtightness testing of a battery device. The battery device includes multiple isolated chambers, each chamber being adjacent to at least one other chamber, with an interface between the adjacent chambers. The multiple chambers are connected by a piping assembly, which is equipped with a valve assembly. The airtightness testing method includes: performing an airtightness test on a first chamber; if the airtightness of the first chamber is qualified, connecting a second chamber adjacent to the first chamber to the first chamber; and performing an airtightness test on the first chamber group formed by the first and second chambers under a state of pressure equilibrium. This application can reduce the amount of gas flowing through the interface between the first and second chambers, reduce the influence of the interface on the airtightness test result of the second chamber, reduce the possibility of misjudgment due to internal gas leakage in the battery device, and thus improve the accuracy of airtightness testing.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular to a method and apparatus for testing the airtightness of a battery device. Background Technology

[0002] In recent years, with the rapid development of new energy technologies, new energy vehicles have been increasingly widely used and are gradually replacing traditional fuel vehicles, becoming one of the mainstream modes of transportation. As the power source of new energy vehicles, the power battery is one of their core components; therefore, the safety performance of the power battery has become a key focus of attention.

[0003] The airtightness of a battery device affects its reliability and safety. Improving the accuracy of airtightness testing is a key research direction in battery technology development. Summary of the Invention

[0004] This application provides a method and apparatus for testing the airtightness of a battery device, which helps to improve the accuracy of airtightness testing.

[0005] According to a first aspect of this application, a method for testing the airtightness of a battery device is provided. The battery device includes multiple mutually isolated chambers, each chamber being adjacent to at least one other chamber, with an interface between adjacent chambers. The multiple chambers are connected to a piping assembly, which is equipped with a valve assembly configured to enable on / off switching between the multiple chambers. The airtightness testing method includes: performing an airtightness test on a first chamber; if the airtightness of the first chamber is qualified, connecting a second chamber adjacent to the first chamber to the first chamber; and performing an airtightness test on a first chamber group formed by the first chamber and the second chamber under a state of pressure equilibrium.

[0006] In this embodiment, the airtightness of the second chamber is indirectly determined by detecting the airtightness of the first chamber group when the first and second chambers are connected and the pressure is balanced. This can reduce the amount of gas flowing through the interface between the first and second chambers, reduce the influence of the interface between the first and second chambers on the airtightness detection result of the second chamber, reduce the possibility of misjudgment caused by gas leakage inside the battery device, and thus improve the accuracy of airtightness detection.

[0007] In some embodiments, the number of chambers is n, where n is greater than or equal to 3. The airtightness testing method further includes: if the airtightness of the (m-1)th chamber group formed by the first chamber to the mth chamber is qualified, connecting the (m+1)th chamber adjacent to at least one of the first chambers to the mth chamber, and performing airtightness testing on the mth chamber group formed by the first chamber to the m+1th chamber under a state of air pressure balance; where m is {2, ..., n-1}. This application embodiment uses a gradient testing method, first single chamber, then double chamber, then triple chamber or more chambers, to sequentially test the airtightness of multiple chambers. This helps to reduce the influence of the interface between any two adjacent chambers inside the battery device on the chamber airtightness test results, reduce the probability of misjudgment, and improve the accuracy of airtightness testing for each chamber.

[0008] In some embodiments, performing an airtightness test on the first chamber includes: connecting the first chamber to a pressure regulating component and blocking the connection between the first chamber and other chambers except the first chamber; adjusting the pressure of the first chamber using the pressure regulating component; acquiring pressure data of the first chamber within a preset testing period; and determining whether the airtightness of the first chamber is qualified based on the pressure data. Determining whether the airtightness of the first chamber is qualified using pressure data within the preset testing period simplifies the testing process and improves accuracy. Connecting the first chamber independently to the pressure regulating component, with the component adjusting the pressure within the first chamber independently, helps reduce the influence of other chambers on the airtightness test results of the first chamber.

[0009] In some embodiments, the pressure regulating assembly adjusts the pressure of the first chamber by either inflating or deflating the first chamber. Detecting the airtightness of the first chamber by deflating it helps save on subsequent testing operations for the battery device. For example, if the airtightness test is passed, helium testing can be performed directly, thus saving the deflating operation before helium testing and improving efficiency.

[0010] In some embodiments, the preset detection cycle includes a testing phase, acquiring pressure data of the first chamber within the preset detection cycle, and determining whether the airtightness of the first chamber is qualified based on the pressure data of the first chamber. This includes: acquiring the pressure difference of the first chamber during the testing phase using a first detection component; and determining whether the airtightness of the first chamber is qualified based on the pressure difference of the first chamber during the testing phase. Determining whether the airtightness of the first chamber is qualified by using the pressure difference of the first chamber during the testing phase helps to improve the accuracy of the airtightness test results of the first chamber.

[0011] In some embodiments, the preset detection cycle further includes a pressure stabilization phase before the testing phase; acquiring pressure data of the first chamber within the preset detection cycle, and determining whether the airtightness of the first chamber is qualified based on the pressure data of the first chamber, includes: after stabilizing the pressure for a first preset time, acquiring the measured pressure of the first chamber through a second detection component connected to the first chamber; preliminarily determining the airtightness of the first chamber based on the acquired measured pressure; if the airtightness of the first chamber is preliminarily determined to be qualified, then acquiring the pressure difference through the first detection component, and finally determining whether the airtightness of the first chamber is qualified based on the pressure difference. At the end of the pressure stabilization phase, the airtightness of the first chamber is roughly estimated by acquiring the measured pressure in the first chamber through the second detection component, and the testing phase is then performed only if the airtightness of the first chamber is roughly estimated to be qualified, which helps to reduce detection steps and save detection time.

[0012] In some embodiments, the airtightness test of the k-th chamber group includes: acquiring pressure data of the k-th chamber group within a preset testing period, and determining whether the airtightness of the k-th chamber group is qualified based on the pressure data; where k is {1, ..., n-1}, and n is the number of chambers. Only the pressure of the first chamber is adjusted using the pressure regulating component. After all chambers in the k-th chamber group are connected, the pressure of any chamber is no longer adjusted using the pressure regulating component, and all chambers in the k-th chamber group automatically adjust to pressure balance, which helps reduce pressure regulation steps and saves testing time.

[0013] In some embodiments, the preset detection cycle includes a testing phase; acquiring pressure data of the k-th chamber group within the preset detection cycle, and determining whether the airtightness of the k-th chamber group is qualified based on the pressure data of the k-th chamber group, includes: acquiring the pressure difference of the k-th chamber group during the testing phase using a first detection component; and determining whether the airtightness of the k-th chamber group is qualified based on the pressure difference of the k-th chamber group during the testing phase. Determining whether the airtightness of the k-th chamber group is qualified by using the pressure difference of the k-th chamber group during the testing phase is beneficial to improving the accuracy of the airtightness test results of the k-th chamber group.

[0014] In some embodiments, performing an airtightness test on the first chamber includes: adjusting the pressure in the first chamber to a first preset pressure; determining whether the airtightness of the k-th chamber group is qualified based on the pressure difference during the testing phase, including: if the absolute value of the pressure difference of the k-th chamber group based on a second preset pressure is less than a preset pressure difference threshold, then determining that the airtightness of the k-th chamber group is qualified; wherein, the first preset pressure is k+1 times the second preset pressure. Determining whether the airtightness of the k-th chamber group is qualified based on the absolute value of the pressure difference of the k-th chamber group based on the second preset pressure is beneficial to improving the accuracy of the airtightness test results of the k-th chamber group.

[0015] In some embodiments, the airtightness test of the k-th chamber group includes: connecting each chamber in the k-th chamber group to a pressure regulating component, and blocking the connection between other chambers except the k-th chamber group and the pressure regulating component; adjusting the pressure of the k-th chamber group through the pressure regulating component; acquiring the pressure data of the k-th chamber group within a preset test period, and determining whether the airtightness of the k-th chamber group is qualified based on the pressure data of the k-th chamber group; wherein k is {1, ..., n-1}, and n is the number of chambers.

[0016] In some embodiments, the preset detection cycle includes a testing phase, acquiring pressure data of the k-th chamber group within the preset detection cycle, and determining whether the airtightness of the k-th chamber group is qualified based on the pressure data of the k-th chamber group. This includes: acquiring the pressure difference of the k-th chamber group during the testing phase using a first detection component; and determining whether the airtightness of the k-th chamber group is qualified based on the pressure difference during the testing phase. Determining whether the airtightness of the k-th chamber group is qualified by using the pressure difference during the testing phase helps improve the accuracy of the airtightness test results of the k-th chamber group.

[0017] In some embodiments, adjusting the pressure of each chamber in the k-th chamber group using a pressure regulating component includes: adjusting the pressure of each chamber in the k-th chamber group to a third preset pressure using the pressure regulating component; determining whether the airtightness of the k-th chamber group is qualified based on the pressure difference of the k-th chamber group during the testing phase includes: if the absolute value of the pressure difference of the k-th chamber group based on the third preset pressure is less than a preset pressure difference threshold, then determining that the airtightness of the k-th chamber group is qualified. Determining whether the airtightness of the k-th chamber group is qualified based on the absolute value of the pressure difference of the k-th chamber group based on the third preset pressure is beneficial to improving the accuracy of the airtightness test results of the k-th chamber group.

[0018] In some embodiments, the pressure regulation method of each chamber in the k-th chamber group is the same as that of the first chamber. This helps to save the pressure regulation time of the k-th chamber group and reduce the total airtightness test time.

[0019] In some embodiments, the preset detection cycle further includes a pressure stabilization phase before the testing phase; acquiring pressure data of the k-th chamber group within the preset detection cycle, and determining whether the airtightness of the k-th chamber group is qualified based on the pressure data of the k-th chamber group, includes: after stabilizing the pressure for a second preset time, acquiring the pressure in each chamber through multiple second detection components respectively connected to each chamber; preliminarily determining the airtightness of the k-th chamber group based on the acquired pressure in each chamber; and, if the airtightness of the k-th chamber group is preliminarily determined to be qualified, finally determining whether the airtightness of the k-th chamber group is qualified based on the pressure difference acquired by the first detection component. At the end of the pressure stabilization phase, the airtightness of the k-th chamber group is roughly estimated first by using the measured pressure in the k-th chamber group acquired by the second detection component, and the testing phase is then performed only if the airtightness of the k-th chamber group is roughly estimated to be qualified, which helps to reduce the number of detection steps and save detection time.

[0020] According to a second aspect of this application, this application provides an airtightness testing device for a battery device, the airtightness testing device being used to implement the airtightness testing method provided according to any embodiment of the first aspect.

[0021] According to a second aspect of this application, this application provides an airtightness testing device for a battery device. The airtightness testing device includes: a pressure regulating assembly configured to regulate pressure data in all chambers connected to the pressure regulating assembly; a detection assembly configured to acquire pressure data in the chambers connected to the pressure regulating assembly; a pipeline assembly connecting the pressure regulating assembly and each chamber; and a valve assembly disposed in the pipeline assembly and configured to enable on / off switching between the chambers and the pressure regulating assembly, and between multiple chambers.

[0022] In some embodiments, the detection component includes a first detection element configured to acquire the pressure difference of a single chamber connected to the pressure regulating component within a preset detection period, and configured to acquire the pressure difference of a group of chambers formed by all chambers connected to the pressure regulating component within a preset detection period.

[0023] In some embodiments, the piping assembly includes a first pipe and a plurality of second pipes, the plurality of second pipes being arranged in parallel and respectively connecting to a plurality of chambers; the first pipe is connected to a pressure regulating assembly and the plurality of second pipes; the valve assembly includes a first valve and a plurality of second valves, the first valve being disposed in the first pipe and the plurality of second valves being respectively disposed in the plurality of second pipes; a first detection component is connected to the first pipe and the plurality of second pipes. The airtightness of multiple chambers can be detected by a single first detection component, which helps to reduce equipment costs. Attached Figure Description

[0024] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0025] Figure 1 This is an exploded view of the battery device involved in the embodiments of this application.

[0026] Figure 2 This is a schematic diagram of the structure of the airtightness testing device for a battery device provided in some embodiments of this application.

[0027] Figure 3 This is a schematic flowchart of a battery device airtightness testing method provided in some embodiments of this application.

[0028] Figure 4 This is a schematic flowchart of a battery device airtightness testing method provided in other embodiments of this application.

[0029] Figure 5 This is a schematic flowchart illustrating the airtightness testing of the first chamber in some embodiments of the present application.

[0030] The reference numerals in the accompanying drawings for the specific embodiments are as follows:

[0031] 1. Battery assembly; 10. Housing; 10a. First housing section; 10b. Second housing section; 11. Chamber; 12. Separating beam; 20. Interface; 30. Battery cell;

[0032] 41. Air pressure regulating component; 411. Air extraction device; 412. Air inflation device; 42. Detection component; 421. First detection component; 422. Second detection component; 43. Piping assembly; 431. First pipeline; 432. Second pipeline; 433. Third pipeline; 44. Valve assembly; 441. First valve; 442. Second valve; 443. Third valve. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0034] The terms "first," "second," "third," etc., used in the specification, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments.

[0035] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0036] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 80°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-10°, the two directions can be considered parallel.

[0038] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0039] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0040] A battery device typically includes a housing for encapsulating one or more individual battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the individual battery cells.

[0041] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into an independent module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties. The battery cell assembly can be housed within a housing by fixing the battery module within the housing. As an example, the housing can include a top cover, a frame, and a bottom plate. The top cover and bottom plate are respectively connected to the frame, creating a closed space inside the housing to house the battery cell assembly.

[0042] In this embodiment of the application, the battery cell can be a secondary battery cell, which refers to a battery cell that can be used again after being discharged by recharging to activate the active materials.

[0043] The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., but the embodiments of this application are not limited to this.

[0044] The airtightness of a battery device affects its reliability and safety. In techniques for airtightness testing of multi-chamber devices, the airtightness of each chamber is typically tested individually and sequentially. However, applying this method to battery devices can compromise the accuracy of the test results. Battery devices usually consist of multiple isolated chambers, each housing individual battery cells and electrical components (such as high-voltage boxes). Adjacent chambers are typically separated by partition beams, forming an interface at these beams. When inflating each chamber individually using a inflation device and then testing its airtightness, it is difficult to guarantee absolute pressure balance between adjacent chambers. If the inflated pressures of adjacent chambers are inconsistent, and some degree of cross-contamination (which is permissible) occurs at the interface, gas will flow between the chambers, affecting the accuracy of the airtightness test results. For example, if the air flow rate between two adjacent chambers is close to the air leakage flow rate between one of the chambers and the external environment, the pressure change in that chamber will be minimal, which may lead to the chamber being mistakenly judged as having adequate airtightness.

[0045] In view of this, this application provides a technical solution that first performs an airtightness test on a first chamber among multiple chambers. If the airtightness of the first chamber is qualified, a second chamber adjacent to the first chamber is connected to the first chamber, so that the first and second chambers are in a state of pressure equilibrium. Then, the airtightness of the entire first chamber group formed by the first and second chambers is tested. If the airtightness of the first chamber group is qualified, it indicates that the airtightness of the second chamber is qualified. During the airtightness test of the second chamber, the air pressure of the first and second chambers is balanced. This reduces the amount of gas flowing through the interface between the first and second chambers, reduces the influence of the interface on the airtightness test results of the second chamber, reduces the possibility of misjudgment due to gas leakage inside the battery device, and thus improves the accuracy of the airtightness test.

[0046] The technical solutions provided in this application are applicable to the airtightness testing method and airtightness testing equipment for battery devices.

[0047] The battery devices described in this application can be used in electrical devices that use battery devices as a power source or in various energy storage systems that use battery devices as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0048] Figure 1 This is an exploded view of the battery device according to an embodiment of this application. Figure 2 This is a schematic diagram of the structure of an airtightness testing device for a battery device provided in some embodiments of this application. (Refer to...) Figure 1 and Figure 2 The battery device 1 according to the embodiments of this application includes a plurality of mutually isolated chambers 11, each chamber 11 being arranged adjacent to at least one other chamber 11, and the adjacent chambers 11 having an interface 20. Optionally, two adjacent chambers 11 are separated by a partition beam 12, and the two adjacent chambers 11 form an interface at the partition beam 12. The plurality of chambers 11 are connected to a piping assembly 43, and the piping assembly 43 is provided with a valve assembly 44, which is configured to realize the on / off switching between the plurality of chambers 11.

[0049] The piping assembly 43 includes multiple pipes, and the valve assembly 44 includes multiple valves. The opening and closing states of one or more valves can control the flow between the multiple chambers 11. For example, the valve assembly 44 can open the pipe connecting two chambers 11, thus enabling communication between the two chambers 11. Conversely, the valve assembly 44 can close the pipe connecting two chambers 11, thus blocking communication between the two chambers 11.

[0050] The number of chambers 11 is at least two. Optionally, at least one chamber 11 is an electrical chamber for housing electrical components such as a battery management unit, a battery monitoring unit, and a high-voltage box. At least one chamber 11 is an energy chamber for housing a single battery cell 30.

[0051] A chamber 11 may be adjacent to only one other chamber 11, or it may be adjacent to two or more other chambers 11. Each pair of adjacent chambers 11 has an interface 20.

[0052] For example, the battery device 1 includes three chambers 11, any two of which are arranged adjacent to each other. The interface between the three chambers 11 is T-shaped.

[0053] The battery device 1 includes a housing 10, which includes a first housing portion 10a and a second housing portion 10b. The first housing portion 10a and the second housing portion 10b cover each other to form a receiving space. The receiving space is provided with at least one partition beam 12, which divides the receiving space into multiple chambers 11.

[0054] In some embodiments, refer to Figure 2 The airtightness testing device for battery device 1 includes a pressure regulating assembly 41, a detection assembly 42, a piping assembly 43, and a valve assembly 44. The pressure regulating assembly 41 is configured to regulate the pressure of all chambers 11 connected to it. The detection assembly 42 is configured to acquire pressure data of the chambers 11 connected to the pressure regulating assembly 41. The piping assembly 43 connects the pressure regulating assembly 41 to each chamber 11. The valve assembly 44 is disposed on the piping assembly 43 and configured to enable / disabling of connection / disabling between the chambers 11 and the pressure regulating assembly 41, as well as between multiple chambers 11.

[0055] The pressure regulating component 41 is used to regulate the pressure in the chamber 11. The pressure regulating component 41 regulates the pressure in the chamber 11 in ways including but not limited to increasing the pressure in the chamber 11 or decreasing the pressure in the chamber 11.

[0056] The air pressure regulating assembly 41 may include one or more regulating devices. Optionally, the air pressure regulating assembly 41 includes at least one of an air extraction device 411 and an air inflation device 412.

[0057] The detection component 42 can acquire pressure data of a single chamber 11 connected to the pressure regulating component 41, or it can acquire pressure data of a group of chambers 11 connected to the pressure regulating component 41. The pressure data includes, but is not limited to, at least one of pressure difference and measured pressure. Accordingly, the detection component 42 may include one detection element, or it may include multiple identical or different detection elements.

[0058] The airtightness testing equipment also includes a controller connected to the valve assembly 44. The controller controls the opening and closing of the valve assembly 44 to selectively connect one or more of the multiple chambers 11 to the pressure regulating assembly 41, and to selectively connect some of the multiple chambers 11. The controller is connected to the detection assembly 42 to receive the pressure data acquired by the detection assembly 42 and to determine whether the airtightness of the corresponding chamber 11 is qualified based on the pressure data.

[0059] In some embodiments, refer to Figure 2The detection component 42 includes a first detection component 421, which is configured to acquire the pressure difference of a single chamber 11 connected to the pressure regulating component 41 within a preset detection period, and is also configured to acquire the pressure difference of a chamber group formed by all chambers 11 connected to the pressure regulating component 41 within a preset detection period.

[0060] Optionally, the number of the first detection component 421 is one.

[0061] Optionally, the first detection component 421 includes a leak detector.

[0062] In some embodiments, refer to Figure 2 The detection component 42 includes multiple second detection elements 422, each corresponding to one of the multiple chambers 11. Each second detection element 422 is configured to acquire the measured pressure of a specific chamber 11. During the process of the pressure regulating component 41 adjusting the pressure of the chamber 11, the pressure regulating component 41 stops when the pressure measured by the second detection element 422 reaches a certain preset value.

[0063] Optionally, the second detection component 422 includes a pressure gauge.

[0064] In some embodiments, refer to Figure 2 The piping assembly 43 includes a first piping 431 and multiple second piping 432, which are arranged in parallel and connected to multiple chambers 11 respectively. The first piping 431 connects to the air pressure regulating assembly 41 and the multiple second piping 432. The valve assembly 44 includes a first valve 441 and multiple second valves 442, with the first valve 441 located in the first piping 431 and the multiple second valves 442 respectively located in the multiple second piping 432. A first detection component 421 connects the first piping 431 and the multiple second piping 432. The airtightness of multiple chambers 11 can be detected by a single first detection component 421, which helps reduce equipment costs.

[0065] The number of first pipes 431 can be the same as the number of regulating devices. Each first pipe 431 connects to a corresponding regulating device and multiple second pipes 432. The number of first valves 441 can be the same as the number of first pipes 431. Each first pipe 431 is provided with a first valve 441.

[0066] When there are multiple first pipes 431, the multiple first pipes 431 are connected in parallel.

[0067] For example, refer to Figure 2The air pressure regulating assembly 41 includes an air extraction device 411 and an air inflation device 412. There are two first pipes 431 and two first valves 441, with the two first pipes 431 connected in parallel and the two first valves 441 respectively located on the two first pipes 431. The first ends of the two first pipes 431 are respectively connected to the air extraction device 411 and the air inflation device 412, and multiple second pipes 432 are connected in parallel to the second ends of the two first pipes 431.

[0068] When performing an airtightness test on the battery device 1, the air pressure of multiple chambers 11 can be adjusted by using the air extraction device 411 or by using the air filling device 412, depending on the actual needs.

[0069] In some embodiments, refer to Figure 2 The pipeline assembly 43 also includes a third pipeline 433, the first end of which is connected to the first detection component 421, and multiple second pipelines 432 are connected in parallel to the second end of the third pipeline 433.

[0070] In some embodiments, refer to Figure 2 The valve assembly 44 also includes a plurality of third valves 443, which are respectively disposed in a plurality of second pipelines 432. The third valves 443 are configured to selectively connect their respective second pipelines 432 to the external environment. The third valves 443 can serve as exhaust valves for the chamber 11.

[0071] This application provides a method for detecting the airtightness of a battery device. Figure 3 This is a schematic flowchart of a battery device airtightness testing method provided in some embodiments of this application. (Refer to...) Figure 3 The airtightness testing method includes:

[0072] Step S10: Perform an airtightness test on the first chamber; and

[0073] Step S20: If the airtightness of the first chamber is qualified, connect the second chamber, which is adjacent to the first chamber, to the first chamber. Under the condition that the air pressure of the first chamber and the second chamber are balanced, perform an airtightness test on the first chamber group formed by the first chamber and the second chamber.

[0074] The first chamber is any one of the multiple chambers 11. The second chamber is any one of the multiple chambers 11 that is adjacent to the first chamber and forms an interface with the first chamber.

[0075] The methods for testing the airtightness of the first chamber include, but are not limited to, inflating or evacuating the first chamber. The methods for testing the airtightness of the first chamber assembly can be the same as or different from those for testing the airtightness of the first chamber alone.

[0076] The airtightness testing method provided in this application embodiment further includes: ending the test if the airtightness of the first chamber is unqualified, so as to investigate the airtightness defects of the first chamber.

[0077] In step S20, the second valve 442 in the second pipe 432 that communicates with the second chamber can be opened, so that the two second pipes 432 that are respectively connected to the first chamber and the second chamber are connected, thereby connecting the first chamber and the second chamber.

[0078] After the first and second chambers are connected, they eventually reach a state of air pressure equilibrium, forming a single unit. If the airtightness of the first chamber unit is satisfactory under this air pressure equilibrium state, then the airtightness of the second chamber is also satisfactory.

[0079] In this embodiment, the airtightness of the second chamber is indirectly determined by detecting the airtightness of the first chamber group when the first and second chambers are connected and the air pressure is balanced. This can reduce the amount of gas flowing through the interface between the first and second chambers, reduce the influence of the interface between the first and second chambers on the airtightness detection result of the second chamber, reduce the possibility of misjudgment caused by gas leakage inside the battery device 1, and thus improve the accuracy of airtightness detection.

[0080] Figure 4 This is a schematic flowchart illustrating a method for detecting the airtightness of a battery device according to other embodiments of this application. In some embodiments, the number of chambers 11 is n, where n is greater than or equal to 3. (Refer to...) Figure 4 The airtightness testing method provided in this application embodiment further includes:

[0081] Step S30: If the airtightness of the (m-1)th chamber group formed by the first chamber to the mth chamber is qualified, connect the (m+1)th chamber adjacent to at least one of the first chambers to the mth chamber to the first chamber to the mth chamber. Under the condition of air pressure balance in the first chamber to the m+1th chamber, perform an airtightness test on the mth chamber group formed by the first chamber to the m+1th chamber; where m is {2, ..., n-1}.

[0082] It is understandable that both m and n are positive integers.

[0083] The first chamber group includes two chambers, the second chamber group includes three chambers, and the m-th chamber group includes m+1 chambers.

[0084] The (m+1)th chamber can be adjacent to any one or more chambers from the first chamber to the mth chamber.

[0085] In step S30, the second valves 442 in the m+1 second pipes 432 connected to the first chamber to the (m+1)th chamber are opened, so that the (m+1)th chamber is connected to the first chamber to the mth chamber. The second valves 442 in the remaining second pipes 432 are closed to prevent other chambers except the mth chamber group from being connected to the pressure regulating assembly 41.

[0086] The airtightness detection method of this application embodiment will be specifically described below, taking n=4 as an example.

[0087] Battery device 1 includes four chambers 11, and the airtightness testing method for battery device 1 includes:

[0088] The airtightness of the first chamber was tested; and

[0089] If the airtightness of the first chamber is qualified, the second chamber, which is adjacent to the first chamber, is connected to the first chamber. Under the condition that the air pressure of the first chamber and the second chamber are balanced, the airtightness of the first chamber group formed by the first chamber and the second chamber is tested.

[0090] If the airtightness of the first chamber group formed by the first chamber and the second chamber is qualified, the third chamber adjacent to at least one of the first chamber and the second chamber is connected to the first chamber and the second chamber. Under the condition of air pressure balance from the first chamber to the third chamber, the airtightness of the second chamber group formed by the first chamber and the third chamber is tested.

[0091] If the airtightness of the second chamber group formed by the first to third chambers is qualified, the fourth chamber adjacent to at least one of the first to third chambers is connected to the first to third chambers. Under the condition of air pressure balance in the first to fourth chambers, the airtightness of the third chamber group formed by the first to fourth chambers is tested.

[0092] The airtightness of the m-th chamber group refers to the overall airtightness of the entire group formed by all chambers in the m-th chamber group. The airtightness test of the m-th chamber group is performed on the premise that the airtightness of chambers one through m is satisfactory. Therefore, the airtightness of the m-th chamber group can characterize the airtightness of chamber (m+1). In other words, if the airtightness of the (m-1)-th chamber group is satisfactory, the airtightness of the m-th chamber group can characterize the airtightness of chamber (m+1). Indirectly determining the airtightness of chamber (m+1) through the airtightness of the m-th chamber group helps reduce the influence of the interfaces between all adjacent chambers in the m-th chamber group on the test results, thus improving test accuracy.

[0093] This application embodiment uses a gradient detection method that sequentially increases the number of chambers, first single chamber, then double chamber, then triple chamber or more, to detect the airtightness of multiple chambers. This helps to reduce the influence of the interface between any two adjacent chambers inside the battery device 1 on the chamber airtightness detection results, reduce the probability of misjudgment, and improve the accuracy of airtightness detection of each chamber 11.

[0094] Figure 5 This is a schematic flowchart illustrating the airtightness testing of a first chamber in some embodiments of the airtightness testing method provided in this application. In some embodiments, refer to Figure 5 The first chamber was subjected to an airtightness test, including:

[0095] Step S11: Connect the first chamber to the air pressure regulating component 41, and disconnect the other chambers 11 except the first chamber from the air pressure regulating component 41.

[0096] Step S12: Adjust the pressure in the first chamber using the air pressure regulating component 41;

[0097] Step S13: Obtain the pressure data of the first chamber within the preset detection cycle, and determine whether the airtightness of the first chamber is qualified based on the pressure data of the first chamber.

[0098] In step S11, the first valve 441 in the first pipeline 431 can be opened to connect the first pipeline 431, and the second valve 442 in the second pipeline 432 connected to the first chamber can be opened to connect the second pipeline 432, so that the first chamber is connected to the pressure regulating assembly 41 through the first pipeline 431 and the second pipeline 432. The second valves 442 in the remaining second pipelines 432 are closed to prevent other chambers except the first chamber from connecting to the pressure regulating assembly 41.

[0099] In step S12, the pressure in the first chamber can be adjusted to a first preset pressure by the pressure regulating component 41. The pressure data of the first chamber within the preset detection period can be data related to the first preset pressure. Optionally, the pressure data of the first chamber within the preset detection period includes, but is not limited to, pressure changes and pressure values ​​of the first chamber within the preset detection period.

[0100] The pressure data of the first chamber within a preset testing period can characterize the airtightness of the first chamber. For example, if the pressure change in the first chamber is small within the preset testing period, it indicates that the airtightness of the first chamber is qualified. This application determines whether the airtightness of the first chamber is qualified by using the pressure data of the first chamber within a preset testing period, which helps to simplify the testing process and improve the accuracy of the testing.

[0101] In this embodiment, the first chamber is connected to the pressure regulating component 41 separately. The pressure regulating component 41 regulates the pressure in the first chamber separately, which helps to reduce the influence of other chambers on the airtightness test results of the first chamber.

[0102] In some embodiments, the pressure regulating assembly 41 regulates the pressure of the first chamber by evacuating air from the first chamber.

[0103] The air pressure regulating assembly 41 includes an air extraction device 411. When performing an airtightness test on the first chamber, the first chamber can be connected to the air extraction device 411.

[0104] This embodiment of the application detects the airtightness of the first chamber by drawing negative pressure into the first chamber, which helps to save subsequent testing operations for the battery device 1. For example, before performing a helium test, the battery device 1 needs to be drawn negative pressure. By detecting the airtightness of the first chamber by drawing negative pressure into the first chamber, the helium test can be performed directly if the airtightness test is qualified, thereby saving the negative pressure drawing operation before the helium test and improving efficiency.

[0105] In other embodiments, the pressure regulating assembly 41 regulates the pressure of the first chamber by inflating the first chamber. The pressure regulating assembly 41 may include an inflation device 412. When performing an airtightness test on the first chamber, the first chamber may be connected to the inflation device 412.

[0106] In some embodiments, the preset detection cycle includes a testing phase, acquiring pressure data of the first chamber within the preset detection cycle, and determining whether the airtightness of the first chamber is qualified based on the pressure data of the first chamber, including:

[0107] The pressure difference of the first chamber during the test phase is obtained using the first detection component 421;

[0108] The airtightness of the first chamber is determined based on the pressure difference in the first chamber during the testing phase.

[0109] Specifically, if the absolute value of the pressure difference in the first chamber during the testing phase is less than a certain threshold, the airtightness of the first chamber is determined to be qualified; otherwise, the airtightness of the first chamber is determined to be unqualified.

[0110] The test phase lasts for a certain duration. The first detection component 421 can directly obtain the pressure difference between the first chamber at the end of the test phase and the beginning of the test phase. The first detection component 421 can also obtain the pressure of the first chamber at the end of the test phase and the pressure of the first chamber at the beginning of the test phase, and calculate the difference between the pressure of the first chamber at the end of the test phase and the pressure of the first chamber at the beginning of the test phase.

[0111] The embodiments of this application determine whether the airtightness of the first chamber is qualified by the pressure difference of the first chamber during the testing phase, which helps to improve the accuracy of the airtightness test results of the first chamber.

[0112] In some embodiments, the preset testing period further includes a pressure stabilization phase prior to the testing phase. Acquiring pressure data of the first chamber within the preset testing period, and determining whether the airtightness of the first chamber is qualified based on the pressure data of the first chamber, includes:

[0113] After stabilizing the pressure for a first preset time, the measured pressure of the first chamber is obtained through the second detection component 422 connected to the first chamber;

[0114] The airtightness of the first chamber was preliminarily determined based on the measured pressure of the first chamber.

[0115] After initially determining that the airtightness of the first chamber is qualified, the pressure difference is obtained through the first detection component 421, and the airtightness of the first chamber is finally determined based on the pressure difference.

[0116] The detection accuracy of the second detection component 422 is less than that of the first detection component 421.

[0117] The second detection component 422 can acquire the pressure of the first chamber in real time. At the end of the pressure stabilization stage, the airtightness of the first chamber is roughly estimated by the measured pressure in the first chamber acquired by the second detection component 422. If the airtightness of the first chamber is roughly estimated to be qualified, the testing stage is then carried out, which helps to reduce the number of testing steps and save testing time.

[0118] In some embodiments, the airtightness test of the k-th chamber group includes:

[0119] Obtain the pressure data of the k-th chamber group within the preset detection cycle, and determine whether the airtightness of the k-th chamber group is qualified based on the pressure data of the k-th chamber group; where k is {1, ..., n-1}, and n is the number of chambers 11.

[0120] It is understandable that k is a positive integer.

[0121] For example, when k is 2, the airtightness test of the second chamber group includes:

[0122] Obtain the pressure data of the second chamber group within the preset testing cycle, and determine whether the airtightness of the second chamber group is qualified based on the pressure data of the second chamber group.

[0123] The pressure data for the k-th chamber group within the preset detection period includes, but is not limited to, the pressure changes and pressure values ​​of the k-th chamber group within the preset detection period.

[0124] The pressure data of the k-th chamber group within a preset testing period can characterize the airtightness of the k-th chamber group. For example, if the pressure change of the k-th chamber group is small within the preset testing period, it indicates that the airtightness of the k-th chamber group is qualified. This application determines whether the airtightness of the k-th chamber group is qualified by using the pressure data of the k-th chamber group within a preset testing period, which helps to simplify the testing difficulty and improve the testing accuracy.

[0125] All chambers in the k-th chamber group are interconnected and in a state of pressure equilibrium. The pressure data of the k-th chamber group can be characterized using the pressure data of any chamber in the k-th chamber group.

[0126] In this embodiment, only the pressure regulating component 41 is used to regulate the pressure of the first chamber. After all chambers in the k-th chamber group are connected, the pressure regulating component 41 is no longer used to regulate the pressure of any chamber. All chambers in the k-th chamber group are automatically adjusted to pressure balance, which helps to reduce pressure regulation steps and save detection time.

[0127] In some embodiments, the preset testing period includes a testing phase. Acquiring pressure data for the k-th chamber group within the preset testing period, and determining whether the airtightness of the k-th chamber group is qualified based on the pressure data, includes:

[0128] The pressure difference of the k-th chamber group during the testing phase is obtained using the first detection component 421;

[0129] The airtightness of the k-th chamber group is determined based on the pressure difference during the testing phase.

[0130] Specifically, if the absolute value of the pressure difference in the k-th chamber group during the testing phase is less than a certain threshold, the airtightness of the k-th chamber group is determined to be qualified, and the airtightness of the (k+1)-th chamber is determined to be qualified; otherwise, the airtightness of the k-th chamber group is determined to be unqualified, and the airtightness of the (k+1)-th chamber is determined to be unqualified.

[0131] The test phase lasts for a certain duration. The first detection component 421 can directly obtain the pressure difference between the k-th chamber group at the end of the test phase and the beginning of the test phase. The first detection component 421 can also obtain the pressure of the k-th chamber group at the end of the test phase and the pressure of the k-th chamber group at the beginning of the test phase, and calculate the difference between the pressure of the k-th chamber group at the end of the test phase and the pressure of the k-th chamber group at the beginning of the test phase.

[0132] The embodiments of this application determine whether the airtightness of the k-th chamber group is qualified by the pressure difference of the k-th chamber group during the testing phase, which helps to improve the accuracy of the airtightness test results of the k-th chamber group.

[0133] In some embodiments, performing an airtightness test on the first chamber includes: adjusting the pressure of the first chamber to a first preset pressure. Determining whether the airtightness of the k-th chamber group is qualified based on the pressure difference during the testing phase includes: if the absolute value of the pressure difference of the k-th chamber group based on the second preset pressure is less than a preset pressure difference threshold, then determining that the airtightness of the k-th chamber group is qualified; wherein, the first preset pressure is k+1 times the second preset pressure.

[0134] The pressure difference of the k-th chamber group based on the second preset pressure refers to the pressure difference of the k-th chamber group at the end of the test phase compared to the second preset pressure.

[0135] After all chambers in the k-th chamber group are connected, the pressure of any chamber is no longer adjusted using the air pressure regulating component 41. Once all chambers in the k-th chamber group automatically adjust to pressure equilibrium, the pressure in each chamber of the k-th chamber group should theoretically be the second preset pressure. In this embodiment, the airtightness of the k-th chamber group is determined based on the absolute value of the pressure difference relative to the second preset pressure, which helps improve the accuracy of the airtightness test results for the k-th chamber group.

[0136] In other embodiments, the airtightness of the k-th chamber group is tested, including:

[0137] Connect each chamber 11 in the k-th chamber group to the air pressure regulating component 41, and disconnect the other chambers 11 except for the k-th chamber group from the air pressure regulating component 41;

[0138] The pressure of the kth chamber group is adjusted by the air pressure regulating component 41;

[0139] Obtain the pressure data of the k-th chamber group within the preset detection cycle, and determine whether the airtightness of the k-th chamber group is qualified based on the pressure data of the k-th chamber group; where k is {1, ..., n-1}, and n is the number of chambers 11.

[0140] Unlike the previous embodiment, after the chambers 11 of the k-th chamber group are interconnected, the pressure of the k-th chamber group is adjusted again by the pressure regulating component 41. The pressure regulation method of the k-th chamber group can be the same as or different from that of the first chamber. The pressure of the k-th chamber group after adjustment can be the same as or different from the first preset pressure.

[0141] The pressure regulating assembly 41 can be connected to each chamber 11 in the k-th chamber group by opening the first valve 441 in the first pipeline 431 and the second valve 442 in the second pipeline 432 that are respectively connected to each chamber 11 in the k-th chamber group. The connection between the remaining chambers and the pressure regulating assembly 41 can be blocked by closing the second valve 442 in the remaining second pipelines 432.

[0142] In some embodiments, the preset detection period includes a testing phase, acquiring pressure data of the k-th chamber group within the preset detection period, and determining whether the airtightness of the k-th chamber group is qualified based on the pressure data of the k-th chamber group, including:

[0143] The pressure difference of the k-th chamber group during the testing phase is obtained using the first detection component;

[0144] The airtightness of the k-th chamber group is determined based on the pressure difference during the testing phase.

[0145] Specifically, if the absolute value of the pressure difference in the k-th chamber group during the testing phase is less than a certain threshold, the airtightness of the k-th chamber group is determined to be qualified, and the airtightness of the (k+1)-th chamber is determined to be qualified; otherwise, the airtightness of the k-th chamber group is determined to be unqualified, and the airtightness of the (k+1)-th chamber is determined to be unqualified.

[0146] The embodiments of this application determine whether the airtightness of the k-th chamber group is qualified by the pressure difference of the k-th chamber group during the testing phase, which helps to improve the accuracy of the airtightness test results of the k-th chamber group.

[0147] In some embodiments, adjusting the pressure of each chamber 11 in the k-th chamber group using the pressure regulating component 41 includes: adjusting the pressure of each chamber 11 in the k-th chamber group to a third preset pressure using the pressure regulating component 41. Determining whether the airtightness of the k-th chamber group is qualified based on the pressure difference during the testing phase includes: if the absolute value of the pressure difference of the k-th chamber group based on the third preset pressure is less than a preset pressure difference threshold, then determining that the airtightness of the k-th chamber group is qualified.

[0148] The pressure difference of the k-th chamber group based on the third preset pressure refers to the pressure difference of the k-th chamber group at the end of the test phase compared to the third preset pressure.

[0149] The third preset pressure can be the same as or different from the first preset pressure.

[0150] The embodiments of this application determine whether the airtightness of the k-th chamber group is qualified based on the absolute value of the pressure difference of the k-th chamber group based on the third preset pressure, which is beneficial to improving the accuracy of the airtightness test results of the k-th chamber group.

[0151] In some embodiments, the pressure regulation method of each chamber 11 in the k-th chamber group is the same as that of the first chamber. This helps to save the pressure regulation time of the k-th chamber group and reduce the total airtightness test time.

[0152] Optionally, the pressure regulation method includes evacuation or inflation.

[0153] For example, the pressure regulating component 41 regulates the pressure of the first chamber by drawing air from the first chamber, and the pressure regulating component 41 regulates the pressure of the kth chamber group by drawing air from the kth chamber group.

[0154] For example, the pressure regulating component 41 regulates the pressure of the first chamber by inflating the first chamber, and the pressure regulating component 41 regulates the pressure of the kth chamber group by inflating the kth chamber group.

[0155] In some embodiments, the preset testing period further includes a pressure stabilization phase prior to the testing phase. Acquiring pressure data for the k-th chamber group within the preset testing period, and determining whether the airtightness of the k-th chamber group is qualified based on the pressure data, includes:

[0156] After the pressure is stabilized for a second preset time, the pressure in each chamber 11 is obtained by multiple second detection components 422 that are respectively connected to each chamber 11;

[0157] The airtightness of the k-th chamber group is preliminarily determined based on the pressure obtained in each chamber 11.

[0158] After initially determining that the airtightness of the k-th chamber group is qualified, the pressure difference obtained by the first detection component is used to finally determine whether the airtightness of the k-th chamber group is qualified.

[0159] The second preset duration can be the same as or different from the first preset duration.

[0160] The detection accuracy of the second detection component 422 is less than that of the first detection component 421.

[0161] The second detection component 422 can acquire the pressure of the k-th chamber group in real time. At the end of the pressure stabilization stage, the airtightness of the k-th chamber group is roughly estimated by using the measured pressure in the k-th chamber group acquired by the second detection component 422. If the airtightness of the k-th chamber group is roughly estimated to be qualified, the testing stage is then performed, which helps to reduce the number of detection steps and save detection time.

[0162] This application also provides an airtightness testing device for a battery device, which is used to implement the airtightness testing method provided according to any embodiment of this application.

[0163] This application provides an airtightness testing device and method for a battery device. The battery device 1 includes n mutually isolated chambers 11, each chamber 11 being adjacent to at least one other chamber 11, with an interface 20 between adjacent chambers 11. The multiple chambers 11 are connected to a piping assembly 43, which is equipped with a valve assembly 44 configured to control the flow between the multiple chambers 11. The airtightness testing device provided in this application includes a pressure regulating assembly 41, a detection assembly 42, a piping assembly 43, and a valve assembly 44. The pressure regulating assembly 41 is configured to regulate the pressure of all chambers 11 connected to it. The detection assembly 42 is configured to acquire pressure data of the chambers 11 connected to the pressure regulating assembly 41. The piping assembly 43 connects the pressure regulating assembly 41 to each chamber 11. Valve assembly 44 is disposed on pipeline assembly 43 and configured to enable the switching of chamber 11 with pressure regulating assembly 41, and the switching of multiple chambers 11.

[0164] The airtightness testing method provided in this application includes:

[0165] Perform an airtightness test on the first chamber;

[0166] If the airtightness of the first chamber is qualified, the second chamber, which is adjacent to the first chamber, is connected to the first chamber. Under the condition that the air pressure of the first chamber and the second chamber are balanced, the airtightness of the first chamber group formed by the first chamber and the second chamber is tested.

[0167] If the airtightness of the (m-1)th chamber group formed by the first chamber to the mth chamber is qualified, the (m+1)th chamber adjacent to at least one of the first chambers to the mth chamber is connected to the first chamber to the mth chamber. Under the condition of air pressure balance in the first chamber to the (m+1)th chamber, the airtightness of the mth chamber group formed by the first chamber to the (m+1)th chamber is tested; where m is {2, ..., n-1}.

[0168] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for detecting the airtightness of a battery device, characterized in that, The battery device includes a plurality of mutually isolated chambers, each chamber being adjacent to at least one other chamber, with an interface between adjacent chambers. The plurality of chambers are connected to a piping assembly, which is equipped with a valve assembly configured to enable on / off switching between the plurality of chambers. The airtightness testing method includes: The airtightness of the first chamber was tested; and If the airtightness of the first chamber is qualified, the second chamber, which is adjacent to the first chamber, is connected to the first chamber. Under the condition that the air pressure of the first chamber and the second chamber are balanced, the airtightness of the first chamber and the second chamber group is tested.

2. The airtightness testing method according to claim 1, characterized in that, The number of chambers is n, where n is greater than or equal to 3, and the airtightness detection method further includes: If the airtightness of the (m-1)th chamber group formed by the first chamber to the mth chamber is qualified, the (m+1)th chamber adjacent to at least one of the first chamber to the mth chamber is connected to the first chamber to the mth chamber. Under the condition that the air pressure of the first chamber to the (m+1)th chamber is balanced, the airtightness of the mth chamber group formed by the first chamber to the (m+1)th chamber is tested; where m is {2, ..., n-1}.

3. The airtightness testing method according to claim 1 or 2, characterized in that, An airtightness test was performed on the first chamber, including: Connect the first chamber to the air pressure regulating component, and disconnect the other chambers from the air pressure regulating component; The pressure in the first chamber is adjusted by the air pressure regulating component; The pressure data of the first chamber within a preset detection period is obtained, and the airtightness of the first chamber is determined based on the pressure data of the first chamber.

4. The airtightness testing method according to claim 3, characterized in that, The pressure regulating component regulates the pressure in the first chamber in the following ways: Inflate the first chamber with air, or deflate the first chamber with air.

5. The airtightness testing method according to claim 3, characterized in that, The preset testing cycle includes a testing phase, which involves acquiring pressure data of the first chamber within the preset testing cycle, and determining whether the airtightness of the first chamber is qualified based on the pressure data of the first chamber, including: The pressure difference of the first chamber during the test phase is obtained using the first detection component; The airtightness of the first chamber is determined based on the pressure difference in the first chamber during the test phase.

6. The airtightness testing method according to claim 5, characterized in that, The preset detection cycle also includes a voltage stabilization phase prior to the testing phase; Acquire pressure data of the first chamber within a preset detection period, and determine whether the airtightness of the first chamber is qualified based on the pressure data of the first chamber, including: After stabilizing the pressure for a first preset time, the measured pressure of the first chamber is obtained through a second detection component connected to the first chamber; The airtightness of the first chamber is preliminarily determined based on the measured pressure of the first chamber. If the airtightness of the first chamber is initially determined to be qualified, the pressure difference is then obtained through the first detection component, and the airtightness of the first chamber is finally determined based on the pressure difference.

7. The airtightness testing method according to claim 1, characterized in that, The airtightness of the k-th chamber group was tested, including: Obtain the pressure data of the k-th chamber group within a preset detection period, and determine whether the airtightness of the k-th chamber group is qualified based on the pressure data of the k-th chamber group; where k is {1, ..., n-1}, and n is the number of chambers.

8. The airtightness testing method according to claim 7, characterized in that, The preset detection cycle includes a testing phase; Acquire the pressure data of the k-th chamber group within a preset detection period, and determine whether the airtightness of the k-th chamber group is qualified based on the pressure data of the k-th chamber group, including: The pressure difference of the k-th chamber group during the test phase is obtained using the first detection component; The airtightness of the k-th chamber group is determined based on the pressure difference during the test phase.

9. The airtightness testing method according to claim 8, characterized in that, Performing an airtightness test on the first chamber includes: adjusting the pressure in the first chamber to a first preset pressure; Determining whether the airtightness of the k-th chamber group is qualified based on the pressure difference during the test phase includes: if the absolute value of the pressure difference of the k-th chamber group based on the second preset pressure is less than the preset pressure difference threshold, then the airtightness of the k-th chamber group is determined to be qualified; wherein, the first preset pressure is k+1 times the second preset pressure.

10. The airtightness testing method according to claim 1, characterized in that, The airtightness of the k-th chamber group was tested, including: Connect each chamber in the k-th chamber group to the air pressure regulating component, and block the connection between the other chambers outside the k-th chamber group and the air pressure regulating component; The pressure of the kth chamber group is adjusted by the air pressure regulating component; Obtain the pressure data of the k-th chamber group within a preset detection period, and determine whether the airtightness of the k-th chamber group is qualified based on the pressure data of the k-th chamber group; where k is {1, ..., n-1}, and n is the number of chambers.

11. The airtightness testing method according to claim 10, characterized in that, The preset testing cycle includes a testing phase, which involves acquiring pressure data for the k-th chamber group within the preset testing cycle, and determining whether the airtightness of the k-th chamber group is qualified based on the pressure data, including: The pressure difference of the k-th chamber group during the test phase is obtained using the first detection component; The airtightness of the k-th chamber group is determined based on the pressure difference during the test phase.

12. The airtightness testing method according to claim 11, characterized in that, Adjusting the pressure of each chamber in the k-th chamber group by means of the air pressure regulating component includes: adjusting the pressure of each chamber in the k-th chamber group to a third preset pressure by means of the air pressure regulating component; Determining whether the airtightness of the k-th chamber group is qualified based on the pressure difference during the test phase includes: if the absolute value of the pressure difference of the k-th chamber group based on the third preset pressure is less than a preset pressure difference threshold, then the airtightness of the k-th chamber group is determined to be qualified.

13. The airtightness testing method according to claim 10, characterized in that, The pressure regulation method of each chamber in the k-th chamber group is the same as that of the first chamber.

14. The airtightness testing method according to claim 8 or 11, characterized in that, The preset detection cycle also includes a voltage stabilization phase prior to the testing phase; Acquiring the pressure data of the kth chamber group within a preset detection period, and determining whether the airtightness of the kth chamber group is qualified based on the pressure data of the kth chamber group, includes: after stabilizing the pressure for a second preset time, acquiring the pressure in each of the chambers through multiple second detection components that are respectively connected to each of the chambers; The airtightness of the k-th chamber group is initially determined based on the obtained pressure in each chamber. If the airtightness of the k-th chamber group is initially determined to be qualified, the pressure difference obtained by the first detection component is used to finally determine whether the airtightness of the k-th chamber group is qualified.

15. A device for testing the airtightness of a battery device, characterized in that, The airtightness testing equipment is used to implement the airtightness testing method according to any one of claims 1-14.

16. The airtightness testing device according to claim 15, characterized in that, The airtightness testing equipment includes: A pressure regulating component is configured to regulate the pressure data of all chambers connected to the pressure regulating component; A detection component is configured to acquire pressure data in the chamber connected to the pressure regulating component; Piping assembly, connecting the pressure regulating assembly and each of the chambers; and A valve assembly is disposed in the pipeline assembly and configured to enable the switching of the chambers with and between the pressure regulating assembly and between the plurality of chambers.

17. The airtightness testing device according to claim 16, characterized in that, The detection component includes a first detection element, which is configured to acquire the pressure difference of a single chamber connected to the pressure regulating component within a preset detection period, and is also configured to acquire the pressure difference of a group of chambers formed by all the chambers connected to the pressure regulating component within a preset detection period.

18. The airtightness testing device according to claim 17, characterized in that, The piping assembly includes a first pipe and a plurality of second pipes, the plurality of second pipes being arranged in parallel and respectively connecting to a plurality of the chambers, and the first pipe connecting the pressure regulating assembly and the plurality of second pipes; The valve assembly includes a first valve and a plurality of second valves, wherein the first valve is disposed in the first pipeline and the plurality of second valves are respectively disposed in the plurality of second pipelines; The first detection component is connected to the first pipeline and the plurality of second pipelines.

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