Airtightness testing method and device, storage medium, battery system and electric apparatus

Abstract

A battery enclosure airtightness testing method, comprising: acquiring an internal real-time air pressure and an external real-time air pressure of a battery enclosure (S101); determining an internal and external real-time pressure difference of the battery enclosure on the basis of the internal real-time air pressure and the external real-time air pressure (S102); in response to the internal and external real-time pressure difference being less than or equal to a first preset pressure difference threshold, controlling a temperature control element to adjust an internal temperature of the battery enclosure, such that the internal and external real-time pressure difference is greater than or equal to a second preset pressure difference threshold, wherein the second preset pressure difference threshold is greater than the first preset pressure difference threshold; and determining the airtightness of the battery enclosure on the basis of a change relationship of the internal and external real-time pressure difference over time (S103). Further provided are a battery enclosure airtightness testing device, a computer-readable storage medium, a battery system and an electric apparatus.

Description

Airtightness detection method, equipment, storage medium, battery system and electrical device

[0001] This application claims priority to Chinese patent application No. 2024102536869, filed on March 6, 2024, entitled “Airtightness detection method, equipment, storage medium, battery system and electrical device,” which is incorporated herein by reference in its entirety.

Technical field

[0002] The present application relates to the field of battery technology, and in particular to airtightness detection methods, equipment, storage media, battery systems, and electrical devices. [Background Technology]

[0003] Energy conservation and emission reduction are key to sustainable development, which in turn promotes the adjustment of energy structure and drives the development and application of battery technology. The key to the development of battery technology lies in electrochemical energy storage technology. Due to its advantages such as high energy density, good cycle life, high operating voltage, environmental friendliness, and low self-discharge, it has been widely used in portable electronics, electric vehicles, and energy storage systems.

[0004] The battery box is the main load-bearing component of the battery system. It has an enclosed space inside for carrying battery modules. The airtightness of the battery box can directly affect the service life of the battery system. Therefore, the airtightness of the battery box needs to be tested to reduce the risk of damage to the battery system due to poor airtightness of the battery box.

[0005] [Summary of the invention]

[0006] In order to solve the above-mentioned technical problems existing in the prior art, the present application provides an airtightness detection method, equipment, storage medium, battery system and power device.

[0007] To address the above-mentioned issues, the present application provides a battery box airtightness detection method, which includes: obtaining the real-time internal and external air pressures of the battery box; determining the real-time internal and external pressure differential of the battery box based on the real-time internal and external pressures; in response to the real-time internal and external pressure differential being less than or equal to a first preset pressure differential threshold, controlling a temperature control element to adjust the internal temperature of the battery box so that the real-time internal and external pressure differential is greater than or equal to a second preset pressure differential threshold, wherein the second preset pressure differential threshold is greater than the first preset pressure differential threshold; and determining the airtightness of the battery box based on the relationship between the real-time internal and external pressure differential and time. Thus, the real-time internal and external pressure differential is determined based on the real-time internal and external pressures, and the airtightness of the battery box is determined based on the relationship between the real-time internal and external pressure differential and time. Furthermore, the real-time internal and external pressure differential can be increased to greater than or equal to the second preset pressure differential threshold by adjusting the internal temperature of the battery box, thereby facilitating a more accurate determination of the airtightness of the battery box. This mitigates the risk of battery system damage due to a failed battery box airtightness test, thereby improving the performance of the battery system.

[0008] In some embodiments, the step of determining the airtightness of the battery case based on the temporal relationship between the real-time internal and external pressure differential includes: measuring the rate of decrease of the real-time internal and external pressure differential over time to obtain a tested decrease rate; and determining the airtightness of the battery case based on a comparison of the tested decrease rate with a preset decrease rate. Thus, by comparing the tested decrease rate with the preset decrease rate, the airtightness of the battery case can be determined more accurately, thereby further mitigating the risk of battery system damage due to a failed battery case airtightness test.

[0009] In some embodiments, the step of determining the airtightness of the battery box in response to the comparison result of the test descent rate and the preset descent rate includes: if the test descent rate is greater than the preset descent rate, determining that the airtightness of the battery box is unqualified; if the test descent rate is less than or equal to the preset descent rate, determining that the airtightness of the battery box is qualified. Thus, when the test descent rate is greater than the preset descent rate, it is determined that the airtightness of the battery box is unqualified, and when the test descent rate is less than or equal to the preset descent rate, it is determined that the airtightness of the battery box is qualified, thereby more accurately determining the airtightness of the battery box, thereby further mitigating the risk of battery system damage due to unqualified battery box airtightness detection.

[0010] In some embodiments, the step of determining the airtightness of the battery box in response to the comparison result of the test drop rate with the preset drop rate includes: extracting the drop rate of the real-time internal and external pressure differential over time in each time period from the test drop rate to obtain the segmented test rate corresponding to each time period; and determining the airtightness of the battery box in response to the comparison result of the segmented test rate of each time period with the preset segmented rate corresponding to each time period. Thus, comparing the test drop rate by time period with the preset segmented rate of the corresponding time period can more accurately determine the airtightness of the battery box, thereby further mitigating the risk of battery system damage due to unqualified battery box airtightness test.

[0011] In some embodiments, the step of determining the airtightness of the battery box in response to the comparison result of the segmented test rate of each time period with the corresponding preset segmented rate includes: if the segmented test rate of each time period is less than or equal to the corresponding preset segmented rate, then the airtightness of the battery box is determined to be qualified; if there is a segmented test rate greater than the corresponding preset segmented rate, then the airtightness of the battery box is determined to be unqualified. Thus, when the segmented test rate of each time period is less than or equal to the corresponding preset segmented rate, the airtightness of the battery box is determined to be qualified, and when there is a segmented test rate greater than the corresponding preset segmented rate, the airtightness of the battery box is determined to be unqualified. The airtightness of the battery box can be determined more accurately, thereby further mitigating the risk of battery system damage due to unqualified battery box airtightness detection.

[0012] In some embodiments, the step of determining the airtightness of the battery box in response to the comparison result of the test descent rate with the preset descent rate includes: if the test descent rate is greater than the preset descent rate, comparing the duration of the test descent rate being greater than the preset descent rate with a preset duration threshold; and determining the airtightness of the battery box in response to the comparison result of the duration with the preset duration threshold. Thus, comparing the duration of the test descent rate being greater than the preset descent rate with the preset duration threshold can reduce the risk of misjudgment and more accurately determine the airtightness of the battery box, thereby further reducing the risk of battery system damage due to unqualified battery box airtightness testing.

[0013] In some embodiments, the step of determining the airtightness of the battery box in response to the comparison result of the duration and the preset duration threshold includes: if the duration is greater than or equal to the preset duration threshold, determining that the battery box's airtightness is unqualified; if the duration is less than the preset duration threshold, determining that the battery box's airtightness is abnormal. Thus, only when the duration is long is the battery box's airtightness determined to be unqualified, and when the duration is short is the battery box's airtightness determined to be abnormal. This can reduce the risk of misjudgment and more accurately determine the battery box's airtightness, thereby further reducing the risk of battery system damage due to unqualified battery box airtightness testing.

[0014] In some embodiments, after determining that the battery box has an abnormal airtightness if the duration is less than the preset duration threshold, the battery box airtightness detection method further includes: issuing a first warning message in response to the abnormal airtightness of the battery box. Thus, when the battery box has an abnormal airtightness, the first warning message is issued so that corresponding processing operations can be taken in a timely manner based on the first warning message, thereby mitigating the risk of damage caused by untimely processing.

[0015] In some embodiments, after determining the airtightness of the battery box based on the temporal relationship between the real-time internal and external pressure differential, the battery box airtightness detection method further comprises generating a second warning message in response to the battery box failing to meet airtightness standards. Thus, when the battery box fails to meet airtightness standards, the second warning message is issued, allowing for timely processing based on the second warning message, thereby mitigating the risk of damage caused by untimely processing.

[0016] In some embodiments, in response to the real-time internal / external pressure differential being less than or equal to a first preset pressure differential threshold, the step of controlling the temperature control element to adjust the internal temperature of the battery box so that the real-time internal / external pressure differential is greater than or equal to a second preset pressure differential threshold comprises: in response to the real-time internal / external pressure differential being less than or equal to the first preset pressure differential threshold, controlling the temperature control element to adjust the internal temperature of the battery box to obtain an internal / external adjusted pressure differential; and in response to the real-time internal / external adjusted pressure differential being greater than or equal to the second preset pressure differential threshold, controlling the temperature control element to stop adjusting the internal temperature of the battery box and using the internal / external adjusted pressure differential as the real-time internal / external pressure differential. Thus, when the real-time internal / external pressure differential is less than or equal to the first preset pressure differential threshold, the real-time internal / external pressure differential of the battery box is increased to greater than the second preset pressure differential threshold by adjusting the temperature inside the battery box, thereby facilitating a subsequent more accurate determination of the airtightness of the battery box, thereby further mitigating the risk of battery system damage due to a failed battery box airtightness test.

[0017] To solve the above problems, the present application provides a battery box air tightness detection device, which includes a processor and a memory, wherein a computer program is stored in the memory, and the processor is used to execute the computer program to implement the above-mentioned battery box air tightness detection method.

[0018] To solve the above problems, the present application provides a computer-readable storage medium having program instructions stored thereon, which implement the above-mentioned battery box airtightness detection method when executed by a processor.

[0019] To address the above-mentioned issues, the present application provides a battery system comprising a battery box, a first air pressure sensor, and a controller. The first air pressure sensor is used to monitor the real-time air pressure inside the battery box, and the controller is used to execute the battery box air tightness detection method described above. This mitigates the risk of damage to the battery system due to a failed battery box air tightness detection, thereby improving the relevant performance of the battery system. Furthermore, the air tightness detection of the battery box can be implemented using the first air pressure sensor and the controller, significantly reducing costs and improving the space utilization of the battery box.

[0020] In some embodiments, the battery system further includes a second air pressure sensor configured to monitor the real-time air pressure outside the battery box. Monitoring the real-time air pressure outside the battery box using the second air pressure sensor can make the obtained real-time air pressure more similar to the actual real-time air pressure, thereby improving the accuracy of battery box air tightness testing.

[0021] In some embodiments, the battery system further includes a baffle connected to an outer sidewall of the battery compartment, the baffle being configured to block at least a portion of the airflow from passing through the second air pressure sensor. Thus, by blocking at least a portion of the airflow from passing through the second air pressure sensor, the baffle mitigates the significant impact of airflow on the detection results of the second air pressure sensor, thereby improving the accuracy of the external real-time air pressure and, consequently, the accuracy of the battery compartment air tightness detection.

[0022] In some embodiments, the battery case is formed with a housing cavity, and the first air pressure sensor and the controller are disposed within the housing cavity. Thus, the first air pressure sensor and the controller are both located within the housing cavity of the battery case, providing better protection for the first air pressure sensor and the controller. Furthermore, the first air pressure sensor being located within the housing cavity can also make the internal real-time air pressure more similar to the actual internal real-time air pressure, thereby improving the accuracy of battery case air tightness testing.

[0023] In some embodiments, the first air pressure sensor is embedded in the inner wall of the battery box and exposed in the accommodating cavity. Thus, by embedding the first air pressure sensor in the inner wall of the battery box, the space utilization inside the battery box can be improved, while also providing better protection for the first air pressure sensor.

[0024] In some embodiments, the battery system further comprises a battery module disposed within the accommodating cavity, and the battery module and the controller are spaced apart from the first air pressure sensor. Thus, the battery module and the controller are spaced apart from the first air pressure sensor, thereby mitigating the risk of the first air pressure sensor coming into contact with the controller and the battery module, thereby reducing the risk of the first air pressure sensor falling off, or the risk of deformation or short circuiting of the battery module or controller due to contact.

[0025] In some embodiments, the controller includes a battery management system, thereby facilitating the determination of the airtightness of the battery box through the battery management system and facilitating targeted management of the battery system.

[0026] In some embodiments, the battery system further includes a temperature control element disposed within the accommodating cavity, the temperature control element being configured to regulate the internal temperature of the battery box. Thus, by disposing the temperature control element within the accommodating cavity, the temperature within the battery box can be easily regulated by the temperature control element, thereby adjusting the real-time pressure difference between the internal and external sides of the battery box.

[0027] In order to solve the above problems, the present application provides an electrical device, which includes the battery system as described above.

[0028] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application.

Brief Description of the Drawings

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] FIG1 is a schematic flow chart of a battery box airtightness detection method according to one or more embodiments of the present application;

[0031] FIG2 is a schematic flow chart of an embodiment of step S103 in FIG1 ;

[0032] FIG3 is a schematic diagram of an embodiment of the process of step S202 in FIG2 ;

[0033] FIG4 is a schematic block diagram of the structure of a battery box airtightness detection device according to one or more embodiments of the present application;

[0034] FIG5 is a schematic block diagram of the structure of a computer storage medium according to one or more embodiments of the present application;

[0035] FIG6 is a schematic structural diagram of a battery system according to one or more embodiments of the present application;

[0036] FIG7 is a schematic structural diagram of a vehicle according to one or more embodiments of the present application. [Specific implementation method]

[0037] The present application will be further described in detail below in conjunction with the accompanying drawings and examples. It is particularly noted that the following examples are only intended to illustrate the present application and are not intended to limit the scope of the present application. Similarly, the following examples are only some examples of the present application and not all examples. All other examples obtained by those of ordinary skill in the art without creative work are intended to fall within the scope of protection of this application.

[0038] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "installed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can mean fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or connection through an intermediate medium. Those skilled in the art will be able to understand the specific meanings of the above terms in this application in specific circumstances.

[0040] Currently, market developments indicate that batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As battery applications continue to expand, market demand is also growing.

[0041] The batteries described in the embodiments of this application are either rechargeable batteries or disposable batteries. The embodiments disclosed herein will be described primarily using lithium-ion batteries as an example. It should be understood that the embodiments disclosed herein are applicable to any other suitable type of rechargeable battery. The batteries described in the embodiments disclosed herein can be directly or indirectly used in appropriate devices to power such devices.

[0042] Batteries usually include a battery box and battery modules. The battery box is the main load-bearing component of the battery, and an enclosed space is formed inside it to carry the battery module. The airtightness of the battery box can directly affect the service life of the battery. Therefore, the airtightness of the battery box needs to be tested to reduce the risk of damage to the battery system due to poor airtightness of the battery box.

[0043] In order to solve the technical problems existing in the related art, the present application provides a battery box air tightness detection method, which determines the real-time pressure difference between the inside and outside of the battery box by measuring the real-time air pressure outside the battery box and the real-time air pressure inside the battery box. When the battery box has good air tightness, the gas inside the battery box is not easy to leak, resulting in a small change in the real-time pressure difference inside the battery box over time, which in turn results in a small change in the real-time pressure difference between the inside and outside of the battery box over time; when the battery box has poor air tightness, the gas inside the battery box is more likely to leak, resulting in a large change in the real-time pressure difference inside the battery box over time, which in turn results in a large change in the real-time pressure difference between the inside and outside of the battery box over time. Therefore, the air tightness of the battery box can be determined by determining the change in the real-time pressure difference between the inside and outside of the battery box over time.

[0044] Specifically, referring to Figure 1 , Figure 1 is a flow chart of a battery box airtightness detection method according to one or more embodiments of the present application, which includes the following steps S101 to S103 .

[0045] Step S101: Acquire the real-time internal and external air pressures of the battery box.

[0046] The battery box may be provided with an internal space for accommodating the battery module. The internal space and the external environment are separated by the battery box. Therefore, the internal space of the battery box for accommodating the battery module can be defined as the interior of the battery box, and the real-time air pressure inside the battery box can be defined as the internal real-time air pressure of the battery box; the external environment in which the entire battery box is located can be defined as the exterior of the battery box, and the real-time air pressure outside the battery box can be defined as the external real-time air pressure of the battery box. The internal real-time air pressure of the battery box can be monitored by a corresponding air pressure sensor. The external real-time air pressure of the battery box can be defined as atmospheric pressure, and the external real-time air pressure of the battery box can be obtained directly through network information; or an air pressure sensor can be fixed on the outside of the battery box to monitor the external real-time air pressure of the battery box through the air pressure sensor; or when the battery box is used in a vehicle, the external real-time air pressure of the battery box can be monitored by the relevant sensors of the vehicle.

[0047] Step S102: determining the real-time pressure difference between the inside and outside of the battery box according to the real-time internal air pressure and the real-time external air pressure.

[0048] After determining the internal real-time air pressure and the external real-time air pressure, the difference between the internal real-time air pressure and the external real-time air pressure can be calculated and used as the real-time pressure difference between the internal and external real-time air pressures of the battery box. The real-time pressure difference between the internal and external real-time air pressures of the battery box can be obtained by calculating the difference between the internal real-time air pressure and the external real-time air pressure at the same moment. In this embodiment, after obtaining the internal real-time air pressure at each moment, the internal real-time air pressure at that moment is subtracted from the external real-time air pressure corresponding to that moment to obtain the real-time pressure difference between the internal and external real-time air pressure at that moment; or after monitoring the internal real-time air pressure and the external real-time air pressure for a period of time, the internal real-time air pressure and the external real-time air pressure at the corresponding moments in the time period are subtracted to obtain the real-time pressure difference between the internal and external real-time air pressures corresponding to each moment in the time period.

[0049] Step S103: Determine the airtightness of the battery box according to the relationship between the real-time internal and external pressure differences and time.

[0050] When the battery box has good airtightness, the gas inside the battery box is not easy to leak, resulting in a small change in the internal real-time pressure difference of the battery box over time, and thus a small change in the internal and external real-time pressure difference over time. When the battery box has poor airtightness, the gas inside the battery box is more likely to leak, resulting in a large change in the internal real-time pressure difference of the battery box over time, and thus a large change in the internal and external real-time pressure difference over time. Therefore, the airtightness of the battery box can be determined based on the relationship between the change in the internal and external real-time pressure difference over time.

[0051] Through the above implementation, the real-time internal and external pressure difference is determined based on the internal real-time air pressure and the external real-time air pressure, and the air tightness of the battery box is determined based on the relationship between the internal and external real-time pressure difference and the time, thereby alleviating the risk of damage to the battery system due to unqualified battery box air tightness detection, thereby improving the relevant performance of the battery system.

[0052] When the battery box is installed on a vehicle, the real-time internal and external air pressures can be obtained while the vehicle is in motion, effectively testing the airtightness of the battery box while the vehicle is in motion. When the battery box contains a battery module, and the battery module includes multiple smart cells, the real-time internal air pressure of the battery box can be inferred by measuring the internal air pressure, internal temperature, and casing deformation of each smart cell. The obtained real-time external air pressure of the battery box may be affected by the external environment. The obtained real-time external air pressure can be corrected by measuring the real-time temperature of the battery box's outer surface to obtain a more accurate external pressure. Alternatively, when the battery box is in motion, the real-time external air flow can be measured and corrected for the obtained real-time external air pressure using the real-time external air flow to obtain a more accurate external pressure. Alternatively, the obtained real-time external air pressure can be corrected for both the real-time external surface temperature and the real-time external air flow to obtain a more accurate external pressure.

[0053] Referring to FIG. 2 , FIG. 2 is a flow chart of an embodiment of step S103 in FIG. 1 , specifically, including the following steps S201 to S202 .

[0054] Step S201: testing the decreasing rate of the real-time internal and external pressure difference over time to obtain a test decreasing rate.

[0055] The test drop rate can be used to characterize the airtightness of the battery box. When the battery box has good airtightness, the internal gas leaks slowly and the test drop rate is small. When the battery box has poor airtightness, the internal gas leaks quickly and the test drop rate is large. For example, by testing the change of the real-time internal and external pressure differential over time, a curve of the real-time internal and external pressure differential and time can be generated. Then, the generated curve can be differentiated to obtain the drop rate of the real-time internal and external pressure differential over time.

[0056] Step S202: In response to the comparison result of the tested descent rate and the preset descent rate, determine the airtightness of the battery box.

[0057] After the test descent rate is obtained, the test descent rate can be compared with the preset descent rate to obtain a comparison result of the test descent rate and the preset descent rate, so as to determine the air tightness of the battery box based on the comparison result. Among them, the comparison of the test descent rate and the preset descent rate can be based on the comparison of the two at the same time. For example, before monitoring the relationship between the internal and external real-time pressure difference and the time, the maximum value of the internal and external real-time pressure difference can be recorded first, and then the maximum value can be used to find the corresponding preset change curve of the internal and external real-time pressure difference and time, so as to obtain the preset descent rate corresponding to each moment, and then compare the preset descent rate and the test descent rate at the same moment to determine the air tightness of the battery box. Therefore, by comparing the test descent rate with the preset descent rate, the air tightness of the battery box can be determined more accurately, thereby further alleviating the risk of damage to the battery system due to failure of the battery box air tightness test.

[0058] Furthermore, in response to the comparison result of the test descent rate and the preset descent rate, the step of determining the airtightness of the battery box (step S202) includes: if the test descent rate is greater than the preset descent rate, determining that the airtightness of the battery box is unqualified; if the test descent rate is less than or equal to the preset descent rate, determining that the airtightness of the battery box is qualified. When the test descent rate is greater than the preset descent rate, it means that the internal gas of the battery box is leaking faster, which correspondingly reflects that the airtightness of the battery box is poor, that is, the airtightness of the battery box is unqualified; when the test descent rate is less than or equal to the preset descent rate, it means that the internal gas of the battery box is leaking slower and has reached the specified leakage rate, which correspondingly reflects that the airtightness of the battery box is good, that is, the airtightness of the battery box is qualified, so that the airtightness of the battery box can be determined more accurately, thereby further mitigating the risk of damage to the battery system due to unqualified battery box airtightness detection.

[0059] Referring to FIG. 3 , FIG. 3 is a flow chart of an embodiment of step S202 in FIG. 2 , specifically, including the following steps S301 to S302 .

[0060] Step S301: extract the drop rate of the real-time internal and external pressure difference over time in each time period from the test drop rate, and obtain the segmented test rate corresponding to each time period.

[0061] The duration of each period can be set based on actual conditions. For example, when the real-time pressure differential between the inside and outside is large, the corresponding test period is shorter; when the real-time pressure differential between the inside and outside is small, the corresponding test period is longer. In other words, during the test, the length of the test period can gradually increase as the test progresses. The segmented test rate corresponding to each period can be the average rate of decrease for that period, or the test rate corresponding to a specific moment within that period, etc.

[0062] Step S302: determining the airtightness of the battery box in response to a comparison result of the segmented test rate in each time period with the corresponding preset segmented rate.

[0063] After determining the segmented test rate of each time period, the test decline rate of each time period can be compared with the preset decline rate of the corresponding time period to obtain the comparison result of each time period with the corresponding preset segmented rate, so as to determine the air tightness of the battery box based on the comparison result. For example, the test duration can be divided into multiple time periods according to the preset division rules, such as 0~T1, T1~T2, Tn-1~Tn, etc., and then the segmented test rate of a certain time period is compared with the preset segmented rate corresponding to the time period to determine the air tightness of the battery box. For example, the segmented test rate of the Tn-1~Tn period is compared with the preset segmented rate of the Tn-1~Tn period to determine the air tightness of the battery box, so as to be able to more accurately determine the air tightness of the battery box, thereby further alleviating the risk of damage to the battery system due to unqualified battery box air tightness test.

[0064] Furthermore, in response to the comparison result of the segmented test rate of each time period with the corresponding preset segmented rate, the step of determining the airtightness of the battery box (step S302) includes: if the segmented test rate of each time period is less than or equal to the corresponding preset segmented rate, then the airtightness of the battery box is determined to be qualified; if there is a segmented test rate greater than the corresponding preset segmented rate, then the airtightness of the battery box is determined to be unqualified. When the segmented test rates of all time periods are less than or equal to the corresponding preset segmented rates, it means that the internal gas leakage of the battery box is slow and has reached the specified leakage rate, which correspondingly reflects that the airtightness of the battery box is good, that is, the airtightness of the battery box is qualified; if there is one or more segmented test rates greater than the corresponding preset segmented rates, it means that the internal gas leakage of the battery box is fast, which correspondingly reflects that the airtightness of the battery box is poor, that is, the airtightness of the battery box is unqualified. Among them, the comparison method of the segmented test rate of each time period and the corresponding preset segmented rate can be different. For example, when the real-time pressure difference between the inside and outside is large, the duration of the corresponding test period is shorter, and within this time period, the test decrease rate at each moment can be compared with the preset decrease rate at the corresponding moment; when the real-time pressure difference between the inside and outside is small, the duration of the corresponding test period is longer, and within this time period, the average decrease rate of the period can be compared with the preset average decrease rate of the corresponding period, and so on, so as to more accurately determine the air tightness of the battery box, thereby further alleviating the risk of damage to the battery system due to failure of the battery box air tightness test.

[0065] In some embodiments, the step of determining the airtightness of the battery box (step S202) in response to the comparison result of the test drop rate with the preset drop rate includes: if the test drop rate is greater than the preset drop rate, comparing the duration of the test drop rate greater than the preset drop rate with a preset time threshold; and determining the airtightness of the battery box in response to the comparison result of the duration with the preset time threshold. In this embodiment, during the change of the real-time pressure difference between the inside and outside of the battery box over time, the test drop rate at each moment can be compared with the preset drop rate at the corresponding moment. When the test drop rate at a certain moment or within a certain time period is greater than the preset drop rate, the duration of the time period is extracted. If the duration is long, it can be considered that the airtightness of the battery box is poor. If the duration is short, it may be caused by the environment in which the battery box is located. For example, when the battery box is loaded on a vehicle, sudden braking or rapid acceleration of the moving vehicle may cause the battery box to leak air for a short time, which is not directly caused by the airtightness of the battery box. Therefore, comparing the duration of time during which the test descent rate is greater than the preset descent rate with the preset time threshold can reduce the risk of misjudgment and more accurately determine the airtightness of the battery box, thereby further reducing the risk of damage to the battery system due to failure of the battery box airtightness test.

[0066] Furthermore, in response to the comparison result of the duration and the preset duration threshold, the step of determining the airtightness of the battery box includes: if the duration is greater than or equal to the preset duration threshold, determining that the airtightness of the battery box is unqualified; if the duration is less than the preset duration threshold, determining that the airtightness of the battery box is abnormal. The preset duration threshold can be set according to actual conditions. When the duration is greater than or equal to the preset duration threshold, it means that the rapid leakage of internal gas in the battery box is mainly caused by the poor airtightness of the battery box, and it can be determined that the airtightness of the battery box is unqualified. When the duration is less than the preset duration threshold, it may be due to the rapid leakage of internal gas in the battery box due to the environment in which the battery box is located, and it is not entirely caused by the unqualified airtightness of the battery box. Therefore, when the duration is less than the preset duration threshold, it can be determined that the airtightness of the battery box is abnormal, rather than directly determining that the airtightness of the battery box is unqualified.

[0067] Furthermore, after determining that the battery box has an abnormal airtightness if the duration is less than a preset time threshold, the battery box airtightness detection method further includes: issuing a first warning message in response to the abnormal airtightness of the battery box. The first warning message can be used to indicate the abnormal airtightness of the battery box. For example, the first warning message may include, but is not limited to, an alarm sound, a communication message, a level signal, and the like.

[0068] In some embodiments, after determining the airtightness of the battery box based on the temporal relationship between the real-time internal and external pressure differential, the battery box airtightness detection method further comprises: generating a second warning message in response to the battery box failing to meet airtightness standards. The second warning message can be used to indicate that the battery box fails to meet airtightness standards. For example, the second warning message may include, but is not limited to, an alarm sound, a communication message, a voltage level signal, and the like.

[0069] The first warning information and the second warning information are different. For example, when the first warning information and the second warning information are both alarm sounds, the alarm volume of the second warning information may be greater than the alarm volume of the first warning information.

[0070] In some embodiments, after the step of determining the real-time pressure difference between the inside and outside of the battery box based on the internal real-time air pressure and the external real-time air pressure (step S102), the battery box airtightness detection method further includes: in response to the real-time pressure difference between the inside and outside being less than or equal to the first preset pressure difference threshold, controlling the temperature control element to adjust the internal temperature of the battery box so that the real-time pressure difference between the inside and outside is greater than or equal to the second preset pressure difference threshold, wherein the second preset pressure difference threshold is greater than the first preset pressure difference threshold. The temperature control element may include but is not limited to a heating element, a water cooling system for the battery module, and the like. The first preset pressure difference threshold and the second preset pressure difference threshold can be set according to actual conditions, and the second preset pressure difference threshold is greater than the first preset pressure difference threshold. After determining the real-time pressure difference between the inside and outside, if the real-time pressure difference between the inside and outside is small at this time, but the airtightness of the battery box is still determined according to the small real-time pressure difference between the inside and outside, a result that is not very accurate may be obtained. Therefore, after determining the real-time internal and external pressure differential, the real-time internal and external pressure differential can be compared with a first preset pressure differential threshold. When the real-time internal and external pressure differential is less than the first preset pressure differential threshold, it indicates that the real-time internal and external pressure differential is small and not suitable for determining the air tightness of the battery box. To improve the accuracy of the conclusion of the air tightness of the battery box, the internal temperature of the battery box can be adjusted by controlling the temperature control element, for example, increasing or decreasing the internal temperature of the battery box, thereby adjusting the internal air pressure of the battery box so that the real-time internal and external pressure differential is greater than or equal to the second preset pressure differential threshold. When the real-time internal and external pressure differential is greater than or equal to the second preset pressure differential threshold, it indicates that the real-time internal and external pressure differential is suitable for determining the air tightness of the battery box. The real-time internal and external pressure differential can be used to determine the air tightness of the battery box, thereby improving the accuracy of the battery box air tightness detection.

[0071] Furthermore, in response to the real-time internal / external pressure differential being less than or equal to a first preset pressure differential threshold, controlling the temperature control element to adjust the internal temperature of the battery compartment so that the real-time internal / external pressure differential is greater than or equal to a second preset pressure differential threshold includes: in response to the real-time internal / external pressure differential being less than or equal to the first preset pressure differential threshold, controlling the temperature control element to adjust the internal temperature of the battery compartment to obtain an adjusted internal / external pressure differential; and in response to the adjusted internal / external pressure differential being greater than or equal to the second preset pressure differential threshold, controlling the temperature control element to stop adjusting the internal temperature of the battery compartment and using the adjusted internal / external pressure differential as the real-time internal / external pressure differential. After determining the real-time internal / external pressure differential, if the real-time internal / external pressure differential is relatively small, determining the airtightness of the battery compartment based on this relatively small real-time internal / external pressure differential may result in an inaccurate result. Therefore, after determining the real-time pressure difference between the inside and outside, the real-time pressure difference between the inside and outside can be compared with the first preset pressure difference threshold. When the real-time pressure difference between the inside and outside is less than the first preset pressure difference threshold, it means that the real-time pressure difference between the inside and outside is small and not suitable for determining the air tightness of the battery box. In order to improve the accuracy of the conclusion of the air tightness of the battery box, the internal temperature of the battery box can be adjusted by controlling the temperature control element, such as increasing or decreasing the internal temperature of the battery box, thereby adjusting the internal air pressure of the battery box, and then increasing the real-time pressure difference between the inside and outside as the internal and external adjustment pressure difference. The internal and external adjustment pressure difference is compared with the second preset pressure difference threshold. When the internal and external adjustment pressure difference is greater than or equal to the second preset pressure difference threshold, it means that the internal and external adjustment pressure difference is suitable for determining the air tightness of the battery box. The internal and external adjustment pressure difference can be used as the real-time pressure difference between the inside and outside to determine the air tightness of the battery box. At the same time, the temperature control element is controlled to stop adjusting the internal temperature of the battery box to reduce the influence of the temperature control element on the test results during the process of determining the air tightness of the battery box. The temperature control element may include but is not limited to a heating element, a water cooling system of the battery module, and the like. This makes it easier to more accurately determine the air tightness of the battery box in the future, thereby further alleviating the risk of damage to the battery system due to failure of the battery box air tightness test.

[0072] To summarize, the battery box air tightness detection method can determine the real-time pressure difference between the inside and outside based on the internal real-time air pressure and the external real-time air pressure, and determine the air tightness of the battery box based on the relationship between the real-time pressure difference between the inside and outside with time, thereby alleviating the risk of damage to the battery system due to unqualified battery box air tightness detection, thereby improving the relevant performance of the battery system.

[0073] The above method is applied to a battery box airtightness detection device. Specifically, please refer to FIG4 , which is a schematic block diagram of the structure of a battery box airtightness detection device according to one or more embodiments of the present application.

[0074] The battery box airtightness detection device 40 of this embodiment includes a processor 41 and a memory 42. The memory 42 stores a computer program, and the processor 41 is used to execute the computer program to implement the above-mentioned battery box airtightness detection method.

[0075] The processor 41 may be an integrated circuit chip with signal processing capabilities. The processor 41 may also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. The general-purpose processor may be a microprocessor or any conventional processor.

[0076] The battery box airtightness detection method of the above embodiment can be presented in the form of a computer program. This application proposes a computer storage medium carrying the computer program. Referring to Figure 5, Figure 5 is a schematic block diagram of the structure of a computer storage medium according to one or more embodiments of the present application.

[0077] The computer storage medium 50 of this embodiment includes a computer program 51, which can be executed to implement the above-mentioned battery box airtightness detection method. The computer storage medium 50 of this embodiment can be a medium that can store program instructions, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, or can also be a server that stores the program instructions. The server can send the stored program instructions to other devices for execution, or can also execute the stored program instructions itself.

[0078] In addition, if the above functions are implemented as software functions and sold or used as independent products, they can be stored in a storage medium readable by a mobile terminal. That is, the present application also provides a storage device storing program data, which can be executed to implement the methods of the above embodiments. The storage device can be, for example, a USB flash drive, an optical disk, a server, etc. In other words, the present application can be embodied in the form of a software product, which includes a number of instructions for causing a smart terminal to execute all or part of the steps of the methods described in each embodiment.

[0079] In order to solve the technical problems existing in the relevant embodiments, the present application also provides a battery system, see Figure 6, which is a structural schematic diagram of a battery system according to one or more embodiments of the present application.

[0080] The battery system 10 includes a battery case 100, a first air pressure sensor 200, and a controller 300. The first air pressure sensor 200 is used to monitor the real-time air pressure inside the battery case 100, and the controller 300 is used in the above-mentioned airtightness detection method of the battery case 100. In some embodiments, the battery case 100 may include two parts, which are formed by overlapping the two parts. For example, one part is a hollow structure with an open end, and the other part is a plate structure. The plate structure is covered on the open side of the hollow structure to form the battery case 100; or both parts are hollow structures with an open end, and the two parts overlap each other at the opening of the hollow structure. In this embodiment, the location of the first air pressure sensor 200 is not particularly limited. It only needs to enable the first air pressure sensor 200 to monitor the real-time air pressure inside the battery box 100. For example, the first air pressure sensor 200 can be embedded in the battery box 100, with part of the structure of the first air pressure sensor 200 located inside the battery box 100 and the other part located outside the battery box 100; or the first air pressure sensor 200 can be completely contained inside the battery box 100; or the first air pressure sensor 200 can be embedded in the battery box 100. The controller 300 can be a battery management system, or a battery management unit (BMU) of a battery management system, or a central control platform of a car or energy storage system, as long as it can implement the above-mentioned battery box 100 airtightness detection method. The controller 300 can be set at any position in the battery box 100, for example, the controller 300 can be installed on the outer wall of the battery box 100, installed inside the battery box 100, or embedded in the side wall of the battery box 100, etc.

[0081] Through the above-mentioned embodiment, the risk of damage to the battery system 10 due to failure of the airtightness test of the battery box 100 can be alleviated, thereby improving the relevant performance of the battery system 10, and the airtightness test of the battery box 100 can be achieved through the first air pressure sensor 200 and the controller 300, which greatly reduces the cost and can improve the space utilization of the battery box 100.

[0082] In some embodiments, the battery box 100 is formed with a receiving cavity 110 , and the first air pressure sensor 200 and the controller 300 are disposed in the receiving cavity 110 . The battery box 100 may include two parts, and the two parts are covered with each other to form a accommodating cavity 110. The shape and size of the accommodating cavity 110 can be set according to actual conditions. By arranging the first air pressure sensor 200 and the controller 300 in the accommodating cavity 110, the battery box 100 can better protect the first air pressure sensor 200 and the controller 300. In addition, the first air pressure sensor 200 is located in the accommodating cavity 110, which makes it easier to detect the internal real-time air pressure of the battery box 100 through the first air pressure sensor 200. The controller 300 is also located in the accommodating cavity 110, and it is also convenient to control the first air pressure sensor 200 through the controller 300 to detect the internal real-time air pressure of the battery box 100, and receive the internal real-time air pressure of the battery box 100 detected by the first air pressure sensor 200, so as to timely infer the air tightness of the battery box 100 based on the received internal real-time air pressure.

[0083] Furthermore, the first air pressure sensor 200 is embedded in the inner wall of the battery box 100 and exposed within the accommodating cavity 110. The inner wall of the battery box 100 is used to enclose the accommodating cavity 110. A groove can be provided in the inner wall of the battery box 100, with the notch of the groove facing the accommodating cavity 110. By embedding the first air pressure sensor 200 in the groove, the first air pressure sensor 200 is exposed within the accommodating cavity 110, so that the first sensor can detect the real-time air pressure inside the battery box 100. In addition, embedding the first air pressure sensor 200 in the inner wall of the battery box 100 can improve the space utilization inside the battery box 100 and also provide better protection for the first air pressure sensor 200.

[0084] Optionally, the battery system 10 further includes a battery module 500 disposed within the accommodating cavity 110, and the battery module 500 and the controller 300 are spaced apart from the first air pressure sensor 200. The battery module 500 may include a plurality of battery cells, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a plurality of battery cells that are connected in both series and parallel. The plurality of battery cells may be directly connected in series, in parallel, or in a hybrid configuration to form the battery module 500, which is then housed entirely within the battery box 100. Of course, the plurality of battery cells may also be first connected in series, in parallel, or in a hybrid configuration to form a battery module, which is then connected in series, in parallel, or in a hybrid configuration to form the battery module 500, which is then housed within the battery box 100. When the battery module 500 and the first air pressure sensor 200 are simultaneously disposed in the accommodating cavity 110, the first air pressure sensor 200 can be spaced apart from the controller 300 and the battery module 500. This can alleviate the risk of the first air pressure sensor 200 coming into contact with the controller 300 and the battery module 500, thereby reducing the risk of the first air pressure sensor 200 falling off, or the risk of deformation or short circuiting of the battery module 500 and the controller 300 due to contact. The battery system 10 may also include other structures. For example, the battery system 10 may further include a busbar component for achieving electrical connection between multiple battery cells, and the first air pressure sensor 200 may also be spaced apart from the busbar component.

[0085] In some embodiments, the controller 300 includes a battery management system. The battery management system can be electrically connected to the battery module 500 and the first air pressure sensor 200. The battery management system (BMS) can have a great impact on the safe operation of the vehicle, the selection of vehicle control strategies, the selection of charging modes, and the operating costs. Whether during vehicle operation or charging, the battery management system must complete real-time monitoring and fault diagnosis of the status of the battery system 10, and inform the vehicle controller 300 or the charger through the bus so as to adopt a reasonable control strategy to achieve the purpose of effective and efficient use of the battery system 10. In this embodiment, the battery management system can be electrically connected to multiple battery cells of the battery module 500 and the first air pressure sensor 200 at the same time, so as to monitor the status of the cell voltage, temperature, module current, etc. of multiple battery cells at the same time through the battery management system, and perform battery balancing control and fault diagnosis, etc.

[0086] In some embodiments, the battery system 10 further includes a temperature control element 600 disposed within the accommodating cavity 110. The temperature control element 600 is used to regulate the internal temperature of the battery case 100. The temperature control element 600 can be a heating element or a cooling element. The temperature control element 600 can be fixedly disposed within the accommodating cavity 110, such as being fixed to or embedded in the inner wall of the battery case 100. When the battery system 10 includes a battery module 500, the temperature control element 600 can be disposed on the side wall of the battery module 500. The temperature control element 600 can be used to regulate the temperature of the battery module 500 and the internal temperature of the battery case 100, thereby regulating the real-time pressure difference between the internal and external sides of the battery case 100. The temperature control element 600 can also be a thermal management system such as a water cooling system, which can facilitate thermal management of the battery module 500 through the thermal management system, reducing the risk of performance degradation of the battery module 500 due to excessively high or low temperatures.

[0087] In some embodiments, the battery system 10 further includes a second air pressure sensor 400, which is used to monitor the external real-time air pressure of the battery box 100. In this embodiment, the location of the second air pressure sensor 400 is not particularly limited, as long as the second air pressure sensor 400 can monitor the external real-time air pressure of the battery box 100. For example, the second air pressure sensor 400 can be embedded in the battery box 100, with part of the structure of the second air pressure sensor 400 located inside the battery box 100 and another part located outside the battery box 100; or the second air pressure sensor 400 can be attached to the outer surface of the battery box 100; or the second air pressure sensor 400 can be fixed to the outer surface of the battery box 100 via other mounting brackets, etc. Therefore, by monitoring the external real-time air pressure of the battery box 100 through the second air pressure sensor 400, the obtained external real-time air pressure can be made closer to the actual external real-time air pressure, thereby improving the accuracy of the air tightness detection of the battery box 100.

[0088] Furthermore, the battery system 10 includes a baffle 700 connected to the outer wall of the battery case 100. The baffle 700 is used to block at least part of the airflow from passing through the second air pressure sensor 400. The baffle 700 can have any shape. For example, the baffle 700 can be tilted along the direction of the airflow, or the baffle 700 can cooperate with the battery case 100 to form a storage space. The baffle 700 can have an opening that connects the storage space to the external environment. The second air pressure sensor 400 is disposed within the storage space to detect the external real-time air pressure of the battery case 100 through the second air pressure sensor 400. When the battery system 10 is installed in a vehicle, the baffle 700 can also block at least part of the airflow from passing through the second air pressure sensor 400, reducing the significant impact of airflow on the detection results of the second air pressure sensor 400, thereby improving the accuracy of the external real-time air pressure and, thereby, improving the accuracy of the air tightness detection of the battery case 100.

[0089] To sum up, the first air pressure sensor 200 and the controller 300 can alleviate the risk of damage to the battery system 10 due to failure of the air tightness test of the battery box 100, thereby improving the relevant performance of the battery system 10, and the air tightness test of the battery box 100 can be achieved through the first air pressure sensor 200 and the controller 300, which greatly reduces the cost and can improve the space utilization of the battery box 100.

[0090] To solve the technical problems existing in the related art, the present application also provides an electric device, which includes the battery system 10 as described above. The electric device may include, but is not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc. Among them, the electric device may include a battery, and the electric device may provide electrical energy through the battery to realize the corresponding function.

[0091] The present application also provides an electric vehicle, which may include the above-mentioned battery system 10 .

[0092] Please refer to FIG. 7 , which is a schematic structural diagram of a vehicle according to one or more embodiments of the present application.

[0093] Vehicle 1 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, among others. A battery system 10 is provided inside vehicle 1. Battery system 10 can be provided at the bottom, head, or tail of vehicle 1. Battery system 10 can be used to power vehicle 1. For example, battery system 10 can serve as an operating power source for the vehicle. Vehicle 1 can also include a control device 20 and a motor 30. Control device 20 is used to control battery system 10 to power motor 30, for example, to meet the vehicle's power requirements for starting, navigating, and driving.

[0094] In some embodiments of the present application, the battery system 10 can serve not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0095] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0096] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0097] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0098] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (which can be a personal computer, server, network device, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic devices), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and a portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner if necessary, and then storing it in a computer memory.

[0099] The above description is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A battery box airtightness detection method, characterized in that: The battery box airtightness detection method includes: Obtaining the real-time internal and external air pressures of the battery box; Determining the real-time pressure difference between the inside and outside of the battery box according to the real-time internal air pressure and the real-time external air pressure; In response to the real-time internal and external pressure difference being less than or equal to a first preset pressure difference threshold, controlling the temperature control element to adjust the internal temperature of the battery box so that the real-time internal and external pressure difference is greater than or equal to a second preset pressure difference threshold, wherein the second preset pressure difference threshold is greater than the first preset pressure difference threshold; The airtightness of the battery box is determined according to the relationship between the real-time internal and external pressure differences and time.

2. The battery box airtightness detection method according to claim 1, characterized in that: The step of determining the airtightness of the battery box according to the relationship between the real-time internal and external pressure difference and time includes: Testing the rate of decrease of the real-time internal and external pressure difference over time to obtain a test decrease rate; The airtightness of the battery box is determined in response to a comparison result of the test descent rate with a preset descent rate.

3. The battery box airtightness detection method according to claim 2, characterized in that: The step of determining the airtightness of the battery box in response to a comparison result of the tested descent rate and a preset descent rate includes: If the test descent rate is greater than the preset descent rate, determining that the airtightness of the battery box is unqualified; If the test descent rate is less than or equal to the preset descent rate, it is determined that the airtightness of the battery box is qualified.

4. The battery box airtightness detection method according to claim 2, characterized in that: The step of determining the airtightness of the battery box in response to a comparison result of the tested descent rate and a preset descent rate includes: Extract the decreasing rate of the internal and external real-time pressure difference over time in each time period from the test decreasing rate, and obtain the segmented test rate corresponding to each time period; The airtightness of the battery box is determined in response to a comparison result of the segmented test rate of each time period with the corresponding preset segmented rate.

5. The battery box airtightness detection method according to claim 4, characterized in that: The step of determining the airtightness of the battery box in response to a comparison result of the segmented test rate of each time period with the corresponding preset segmented rate includes: If the segmented test rate of each time period is less than or equal to the corresponding preset segmented rate, it is determined that the airtightness of the battery box is qualified; If there is a segmented test rate that is greater than the corresponding preset segmented rate, it is determined that the airtightness of the battery box is unqualified.

6. The battery box airtightness detection method according to claim 2, characterized in that: The step of determining the airtightness of the battery box in response to a comparison result of the tested descent rate and a preset descent rate includes: If the test descent rate is greater than the preset descent rate, then comparing the duration of the test descent rate being greater than the preset descent rate with a preset duration threshold; The airtightness of the battery box is determined in response to a comparison result of the duration and the preset duration threshold.

7. The battery box airtightness detection method according to claim 6, characterized in that: The step of determining the airtightness of the battery box in response to a comparison result of the duration and the preset duration threshold comprises: If the duration is greater than or equal to the preset duration threshold, determining that the airtightness of the battery box is unqualified; If the duration is less than the preset duration threshold, it is determined that the airtightness of the battery box is abnormal.

8. The battery box airtightness detection method according to claim 7, characterized in that: After the step of determining that the airtightness of the battery box is abnormal if the duration is less than the preset duration threshold, the battery box airtightness detection method further includes: In response to the airtightness abnormality of the battery box, a first warning message is issued.

9. The battery box airtightness detection method according to claim 1, characterized in that: After the step of determining the airtightness of the battery box according to the relationship between the real-time internal and external pressure differences and time, the battery box airtightness detection method further includes: In response to the battery box failing to meet airtightness standards, a second warning message is generated.

10. The battery box airtightness detection method according to any one of claims 1 to 9, characterized in that: In response to the real-time internal and external pressure difference being less than or equal to a first preset pressure difference threshold, the step of controlling the temperature control element to adjust the internal temperature of the battery box so that the real-time internal and external pressure difference is greater than or equal to a second preset pressure difference threshold comprises: In response to the real-time internal and external pressure difference being less than or equal to a first preset pressure difference threshold, controlling the temperature control element to adjust the internal temperature of the battery box to obtain an internal and external regulated pressure difference; In response to the internal and external regulated pressure difference being greater than or equal to a second preset pressure difference threshold, the temperature control element is controlled to stop regulating the internal temperature of the battery box, and the internal and external regulated pressure difference is used as the internal and external real-time pressure difference.

11. A battery box airtightness detection device, characterized in that: The battery box airtightness detection device includes a processor and a memory, wherein a computer program is stored in the memory, and the processor is used to execute the computer program to implement the battery box airtightness detection method according to any one of claims 1 to 10.

12. A computer-readable storage medium having program instructions stored thereon, characterized in that: When the program instructions are executed by the processor, the battery box airtightness detection method according to any one of claims 1 to 10 is implemented.

13. A battery system, characterized in that: The battery system includes a battery box, a first air pressure sensor and a controller, wherein the first air pressure sensor is used to monitor the real-time internal air pressure of the battery box, and the controller is used to execute the battery box air tightness detection method as described in any one of claims 1 to 10.

14. The battery system according to claim 13, characterized in that The battery system further includes a second air pressure sensor, which is used to monitor the external real-time air pressure of the battery box.

15. The battery system according to claim 14, characterized in that The battery system further includes a baffle connected to an outer side wall of the battery box, and the baffle is used to block at least part of the airflow from passing through the second air pressure sensor.

16. The battery system according to claim 13, characterized in that The battery box is formed with a receiving cavity, and the first air pressure sensor and the controller are arranged in the receiving cavity.

17. The battery system according to claim 16, characterized in that The first air pressure sensor is embedded in the inner wall of the battery box and exposed in the accommodating cavity.

18. The battery system according to claim 16, wherein: The battery system further includes a battery module disposed in the accommodating cavity, and the battery module and the controller are spaced apart from the first air pressure sensor.

19. The battery system according to any one of claims 13 to 18, characterized in that: The controller includes a battery management system.

20. The battery system according to any one of claims 16 to 18, characterized in that: The battery system further includes a temperature control element disposed in the accommodating cavity, and the temperature control element is used to adjust the internal temperature of the battery box.

21. An electrical device, characterized in that: The electrical device comprises the battery system according to any one of claims 13 to 20.

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