Pressure monitoring and air tightness monitoring method and system for battery box

Abstract

The invention belongs to the field of power battery safety management, and particularly relates to a pressure monitoring and air tightness monitoring method and system for a battery box. The method comprises the following steps: switching on a gas pipeline used for connecting a to-be-monitored single battery box of the whole vehicle with a single gas pressure sensor, and switching off other gas pipelines respectively used for connecting other different single battery boxes of the whole vehicle with the gas pressure sensor; and acquiring internal air pressure data of the battery box corresponding to the gas pipeline through the air pressure sensor so as to perform pressure monitoring according to the acquired internal air pressure data of the battery box. According to the method, the cost is saved in practical application, and the product reliability can be improved due to the fact that excessive redundant devices (namely pressure sensors in one-to-one correspondence with the battery boxes) do not need to be arranged.

Description

Technical Field

[0001] The present invention belongs to the field of power battery safety management, and particularly relates to a method and system for pressure monitoring and airtightness monitoring of a battery box. Background Art

[0002] The development of new energy vehicles has shifted from policy-driven to market-driven, and will evolve around the three directions of "safer, smarter, and more sustainable" in the future. With the technological iteration and the improvement of the ecological system, new energy vehicles will gradually replace fuel vehicles and become the core carrier of the global transportation energy revolution, reshaping the automotive industry pattern and energy consumption mode.

[0003] For the new energy power batteries used in new energy vehicles, the battery box is an important device required to protect the new energy power batteries. Lithium-ion batteries may undergo thermal runaway under overcharge, over-discharge, short-circuit or high-temperature environments, resulting in the decomposition of the internal electrolyte and the generation of a large amount of gas (such as CO, H2, etc.), causing a sudden increase in the internal pressure of the battery box. If the pressure cannot be released in time, it may cause the battery to bulge, rupture or even explode. Since the gas change that may occur during the operation of the new energy power battery will change the internal pressure of the battery box, seriously affecting the safety and performance of the new energy power battery, the battery safety problems caused by this factor have become the focus of attention in the industry.

[0004] In summary, the current demand is to monitor the internal pressure of the battery box, that is, to monitor the air pressure change in real time, so as to identify the early signals of thermal runaway (such as abnormal air pressure fluctuations) in advance, trigger the safety protection mechanism (such as cutting off the circuit, starting the pressure relief valve or activating the cooling system), and avoid chain reactions. At present, the battery box pressure monitoring technology in the industry has not been applied in batches, and the commonly used method is to directly install the monitoring module for monitoring the internal pressure of the battery box on the battery pack housing. However, this method requires setting the corresponding pressure sensor for each single box, which is costly in actual application and affects the product reliability. Summary of the Invention

[0005] The purpose of the present invention is to provide a method and system for pressure monitoring and airtightness monitoring of a battery box, which is used to solve the problem that in the prior art, it is necessary to set the corresponding pressure sensor for each single box, which is costly in actual application and affects the product reliability.

[0006] To achieve the above object, the present invention provides a method for monitoring the pressure of a battery box, which method includes: under the condition of connecting the gas pipeline for connecting a single battery box to be monitored in the whole vehicle with a single air pressure sensor and shutting off the other gas pipelines respectively for connecting other different single battery boxes in the whole vehicle to the air pressure sensor, obtaining the internal air pressure data of the battery box corresponding to the gas pipeline through the air pressure sensor, so as to perform pressure monitoring according to the obtained internal air pressure data of the battery box.

[0007] Beneficial effects: The present invention provides a brand-new method for monitoring the pressure of a battery box. This method obtains air pressure data through the provided method for obtaining air pressure data inside a single battery box in the whole vehicle to achieve the function of pressure monitoring. The method for obtaining the air pressure data is: connecting the gas pipeline for connecting a single battery box to be monitored in the whole vehicle with a single air pressure sensor (at this time, the other gas pipelines respectively for connecting other different single battery boxes in the whole vehicle to the air pressure sensor are all closed), so as to obtain the internal air pressure data of the battery box corresponding to the gas pipeline through the air pressure sensor. That is, which battery box's internal air pressure data in the whole vehicle needs to be obtained, and the corresponding pipeline of that battery box is connected. Since the pipelines where other battery boxes are located are all in a closed state at this time, the air pressure sensor will not be affected by receiving interference data (i.e., the internal air pressure data of other battery boxes) and thus affect the detection accuracy.

[0008] In summary, by adopting this method, the air pressure data of different battery boxes in the whole vehicle can be monitored respectively only through one pressure sensor. When it is necessary to obtain the air pressure data of a certain battery box, only the pipeline connecting the pressure sensor and that battery box needs to be connected, and there is no need to separately set a corresponding pressure sensor for each single box (i.e., a single battery box). This not only saves costs in practical applications, but also can improve the product reliability because there is no need to set too many redundant devices (i.e., pressure sensors corresponding to each battery box one by one).

[0009] Further, each of the gas pipelines for connecting different single battery boxes in the whole vehicle to the same air pressure sensor includes: a switching valve for connecting or shutting off the gas pipeline of the corresponding single battery box to the same air pressure sensor.

[0010] Further, the method for performing pressure monitoring according to the obtained internal air pressure data of the battery box includes: After obtaining the air pressure data, when the air pressure value determined according to the air pressure data remains within the set threshold range within the first set time period, comparing the air pressure value with the set thermal runaway threshold; if the air pressure value is greater than the thermal runaway threshold, it is determined that the battery box corresponding to the air pressure data is a battery box with a risk of thermal runaway and needs to be checked.

[0011] Further, it further includes: Take each individual battery box of the whole vehicle as the battery box to be monitored in turn, so as to obtain the internal air pressure data of the battery box corresponding to each gas pipeline respectively, and perform pressure monitoring on each battery box according to the obtained internal air pressure data of the battery box respectively; After a period of time elapses after performing pressure monitoring on each battery box separately each time, then take each individual battery box of the whole vehicle as the battery box to be monitored in turn, so as to obtain the internal air pressure data of the battery box corresponding to each gas pipeline again respectively, and perform pressure monitoring on each battery box according to the obtained internal air pressure data of the battery box respectively.

[0012] The present invention also provides a pressure monitoring system for a battery box, including: a gas pipeline for connecting an individual battery box to be monitored of the whole vehicle with a single air pressure sensor; other gas pipelines respectively for connecting other different individual battery boxes of the whole vehicle with the air pressure sensor; Under the condition of controlling to connect the gas pipeline for connecting an individual battery box to be monitored of the whole vehicle with a single air pressure sensor and controlling to shut off other gas pipelines respectively for connecting other different individual battery boxes of the whole vehicle with the air pressure sensor, obtain the internal air pressure data of the battery box corresponding to the gas pipeline by controlling the air pressure sensor, so as to control and perform pressure monitoring according to the obtained internal air pressure data of the battery box.

[0013] On the basis of realizing monitoring through automation, this system can achieve the same beneficial effects as the above-mentioned pressure monitoring method for the battery box.

[0014] Furthermore, each of the gas pipelines for connecting different individual battery boxes of the whole vehicle with the same air pressure sensor includes: a switching valve for connecting or disconnecting the corresponding individual battery box from the same air pressure sensor.

[0015] Furthermore, the way of performing pressure monitoring according to the obtained internal air pressure data of the battery box includes: After obtaining the air pressure data, when the air pressure value determined according to the air pressure data remains within the set threshold range within the first set time period, compare the air pressure value with the set thermal runaway threshold; if the air pressure value is greater than the thermal runaway threshold, it is determined that the battery box corresponding to the air pressure data is a battery box with a risk of thermal runaway and needs to be investigated.

[0016] Furthermore, it also includes: Take each individual battery box of the whole vehicle as the battery box to be monitored in turn, so as to obtain the internal air pressure data of the battery box corresponding to each gas pipeline respectively, and perform pressure monitoring on each battery box according to the obtained internal air pressure data of the battery box respectively; After performing pressure monitoring on each battery box separately at intervals, each individual battery box of the entire vehicle is then sequentially used as the battery box to be monitored at a later time, in order to separately obtain the internal air pressure data of the battery box corresponding to each gas pipeline again, and pressure monitoring is performed on each battery box based on the obtained internal air pressure data of the battery box respectively.

[0017] The present invention also provides a method for monitoring the airtightness of a battery box. Under the condition that the gas pipeline connecting the individual battery box to be monitored of the entire vehicle and a single air pressure sensor is connected and the other gas pipelines respectively connecting different individual battery boxes of the entire vehicle to the air pressure sensor are shut off, by connecting the gas pipeline connecting the individual battery box to be monitored of the entire vehicle and the air pressure sensor, the individual battery box to be monitored is inflated, and the internal air pressure data of the battery box is obtained through the air pressure sensor, so as to perform airtightness monitoring based on the obtained internal air pressure data of the battery box.

[0018] Beneficial effects: The present invention provides a brand-new method for monitoring the airtightness of a battery box. This method obtains air pressure data through the provided method for obtaining air pressure data inside an individual battery box of the entire vehicle, so as to achieve the function of airtightness monitoring. The method for obtaining this air pressure data is as follows: Connect the gas pipeline connecting the individual battery box to be monitored of the entire vehicle and a single air pressure sensor (at this time, the other gas pipelines respectively connecting different individual battery boxes of the entire vehicle to the air pressure sensor are all closed), and inflate the individual battery box to be monitored (i.e., the battery box corresponding to the connected pipeline), so as to obtain the internal air pressure data of the battery box corresponding to this gas pipeline through the air pressure sensor. That is to say, to obtain the internal air pressure data of which battery box of the entire vehicle, connect the pipeline corresponding to that battery box and inflate the corresponding battery box. Since the pipelines where other battery boxes are located are in a closed state at this time, the air pressure sensor will not be affected by receiving interference data (i.e., the internal air pressure data of other battery boxes) and thus affect the detection accuracy.

[0019] In summary, by adopting this method, it is possible to separately monitor the air pressure data of different battery boxes of the entire vehicle only through one pressure sensor. When it is necessary to obtain the air pressure data of a certain battery box, it is only necessary to connect the pipeline connecting the pressure sensor and that battery box, without separately setting a corresponding pressure sensor for each single box (i.e., each individual battery box). This not only saves costs in actual applications, but also can improve product reliability because there is no need to set too many redundant devices (i.e., pressure sensors corresponding to each battery box one by one).

[0020] Furthermore, each gas pipeline connecting different individual battery boxes of the entire vehicle to the same air pressure sensor includes: a switching valve for connecting or disconnecting the corresponding individual battery box and the same air pressure sensor.

[0021] Further, the method for airtightness monitoring by connecting the gas pipeline for a single battery box to be monitored in the whole vehicle to the air pressure sensor, inflating the single battery box to be monitored, and obtaining the internal air pressure data of the battery box by the air pressure sensor to perform airtightness monitoring based on the obtained internal air pressure data of the battery box includes: When the first air pressure value corresponding to the internal air pressure data of the battery box obtained by the air pressure sensor during inflation of the single battery box is greater than the airtightness monitoring inflation threshold, the gas pipeline corresponding to the battery box is shut off for a second set duration, and then the gas pipeline corresponding to the battery box is opened again. The second air pressure value corresponding to the internal air pressure data of the battery box is obtained by the air pressure sensor. If the difference between the second air pressure value and the first air pressure value is less than the set pressure difference threshold, it is determined that the airtightness of the single battery box is qualified.

[0022] Further, it also includes: Taking each single battery box of the whole vehicle as the battery box to be monitored in turn, connecting the gas pipeline for a single battery box to be monitored in the whole vehicle to the air pressure sensor, inflating the single battery box to be monitored, obtaining the internal air pressure data of the battery box corresponding to each gas pipeline, and performing airtightness monitoring on each battery box respectively according to the obtained internal air pressure data of the battery box.

[0023] The present invention also provides an airtightness monitoring system for a battery box. The system includes: a gas pipeline for connecting a single battery box to be monitored in the whole vehicle to a single air pressure sensor; other gas pipelines for connecting other different single battery boxes in the whole vehicle to the air pressure sensor respectively; Under the condition of controlling to connect the gas pipeline for a single battery box to be monitored in the whole vehicle to the single air pressure sensor and controlling to shut off other gas pipelines for connecting other different single battery boxes in the whole vehicle to the air pressure sensor respectively, the gas pipeline for connecting a single battery box to be monitored in the whole vehicle to the air pressure sensor is connected, the single battery box to be monitored is inflated, and the internal air pressure data of the battery box is obtained by controlling the air pressure sensor, so as to control airtightness monitoring according to the obtained internal air pressure data of the battery box.

[0024] On the basis of realizing monitoring through automation, the system can achieve the same beneficial effects as the above-mentioned airtightness monitoring method for the battery box.

[0025] Further, each gas pipeline for connecting different single battery boxes in the whole vehicle to the same air pressure sensor includes: a switching valve for connecting or disconnecting the corresponding single battery box to the same air pressure sensor.

[0026] Further, the method for controlling airtightness monitoring by controlling the on-off of the gas pipeline connecting a single battery box to be monitored in the whole vehicle with the air pressure sensor, controlling the inflation of the single battery box to be monitored, and controlling the acquisition of the internal air pressure data of the battery box through the air pressure sensor includes: When the first air pressure value corresponding to the internal air pressure data of the battery box obtained by the air pressure sensor during inflation of the single battery box is greater than the airtightness monitoring inflation threshold, then after turning off the gas pipeline corresponding to the battery box for a second set time period, the gas pipeline corresponding to the battery box is opened again, and the second air pressure value corresponding to the internal air pressure data of the battery box is obtained through the air pressure sensor. If the difference between the second air pressure value and the first air pressure value is less than the set pressure difference threshold, it is determined that the airtightness of the single battery box is qualified.

[0027] Further, it also includes: Taking each single battery box of the whole vehicle as the battery box to be monitored in turn, to respectively inflate the single battery box to be monitored by turning on the gas pipeline connecting the single battery box to be monitored in the whole vehicle with the air pressure sensor, and acquire the internal air pressure data of the battery box corresponding to each gas pipeline, and respectively perform airtightness monitoring on each battery box according to the acquired internal air pressure data of the battery box. Description of the Drawings

[0028] Figure 1 It is a schematic diagram of the principle of the battery box pressure monitoring method in the embodiment of the battery box pressure monitoring method of the present invention; Figure 2 It is a flowchart of pressure monitoring according to the acquired internal air pressure data of the battery box in the embodiment of the battery box pressure monitoring method of the present invention; Among them, 01 and 03 are different single battery boxes of the whole vehicle; 02 is an electromagnetic valve for turning on or off the gas pipeline where the battery box 01 is located; 04 is an electromagnetic valve for turning on or off the gas pipeline where the battery box 03 is located; 05 is an integrated air pressure sensor; 06 is a controller. Detailed Embodiment

[0029] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments.

[0030] Embodiment of the Battery Box Pressure Monitoring Method This embodiment provides a technical solution for a method of monitoring the pressure of a battery box. The main idea of this method is to establish the corresponding relationship between each battery box of the whole vehicle and the same pressure sensor, that is, the internal air pressure data of any battery box of the whole vehicle can be obtained through this pressure sensor, so as to conduct pressure monitoring based on this data; and this method can ensure that when obtaining the internal air pressure data of the battery box, the internal air pressure data of other battery boxes will not be mixed to affect the monitoring result.

[0031] Specifically, this method includes: under the condition of connecting the gas pipeline for connecting a single battery box to be monitored of the whole vehicle with a single air pressure sensor and shutting off the other gas pipelines respectively used to connect other different single battery boxes of the whole vehicle with this air pressure sensor, obtaining the internal air pressure data of the battery box corresponding to this gas pipeline through this air pressure sensor, so as to conduct pressure monitoring based on the obtained internal air pressure data of the battery box.

[0032] In this embodiment, the principle of using this method to realize the pressure monitoring of the battery box is as Figure 1 shown. Among them, 01 and 03 are respectively different single battery boxes of the whole vehicle (i.e., battery box 01 and battery box 03). Air pipe connection ports are provided on this type of battery box to connect with their corresponding pipelines (i.e., ventilation pipelines). 02 and 04 both represent switch valves for connecting or disconnecting the gas pipelines of the corresponding single battery box and the same air pressure sensor. 02 is an electromagnetic valve (i.e., switch valve) for connecting or disconnecting the gas pipeline of the corresponding battery box 01 and the same air pressure sensor (i.e., integrated air pressure sensor 05); 04 is an electromagnetic valve for connecting or disconnecting the gas pipeline of the corresponding battery box 03 and the integrated air pressure sensor 05. In other embodiments, other devices that can be used to connect and disconnect pipelines different from the switch valve can also be adopted.

[0033] In addition, 06 is a controller. This controller 06 is communicatively connected to all electromagnetic valves, and all electromagnetic valves are controlled by the controller 06. This controller 06 is also communicatively connected to the integrated air pressure sensor 05. The integrated air pressure sensor 05 can transmit the obtained internal air pressure data of the battery box to the controller 06 and transfer it to the whole vehicle through the controller.

[0034] Taking the pressure monitoring of battery box 01 by using this method as an example, in this case, the gas pipeline for connecting battery box 01 and the integrated air pressure sensor 05 is connected, and the other gas pipelines respectively used to connect other different single battery boxes of the whole vehicle and this air pressure sensor are shut off (that is, the gas pipelines of all other battery boxes and the integrated air pressure sensor 05. For example, the gas pipeline of battery box 02 and the integrated air pressure sensor 05 in the figure is one of them). The internal air pressure data of this battery box 01 is obtained through the integrated air pressure sensor 05, so as to conduct pressure monitoring based on the internal air pressure data of battery box 01.

[0035] In this embodiment, the method for pressure monitoring based on the obtained internal air pressure data of the battery box includes: After obtaining the air pressure data, when the air pressure value determined according to the air pressure data remains within the set threshold range within the first set time period, compare the air pressure value with the set thermal runaway threshold; if the air pressure value is greater than the thermal runaway threshold, it is determined that the battery box corresponding to the air pressure data is a battery box with a risk of thermal runaway and needs to be checked.

[0036] Specifically, referring to Figure 2 , taking the pressure monitoring based on the obtained internal air pressure data of battery box 01 as an example, in the initial state, all branch solenoid valves are in the closed state, and the selected mode is the "normal working mode" at this time. In this mode, the solenoid valve of the pipeline where battery box 01 is located is opened. After obtaining the internal air pressure data of battery box 01, within X min (i.e., the first set time period), when the air pressure value of this pipeline (i.e., the data determined according to the internal air pressure data of battery box 01) remains within the set threshold range (i.e., the situation where the air pressure value remains stable within a certain time), compare this air pressure value with the set thermal runaway threshold; if this air pressure value is greater than the thermal runaway threshold, it is determined that battery box 01 is a battery box with a risk of thermal runaway and needs to be checked.

[0037] After obtaining the internal air pressure data of battery box 01 for pressure monitoring, then each individual battery box of the whole vehicle, such as battery box 02, etc., is sequentially used as the battery box to be monitored, so as to respectively obtain the internal air pressure data of the battery box corresponding to each gas pipeline, and pressure monitoring is respectively performed on each battery box according to the obtained internal air pressure data of the battery box. That is, within each monitoring cycle, the internal air pressure data of each battery box is sequentially obtained for pressure monitoring.

[0038] In addition, after a period of time elapses after each pressure monitoring is respectively performed on each battery box, then each individual battery box of the whole vehicle is sequentially used as the battery box to be monitored, so as to re-obtain the internal air pressure data of the battery box corresponding to each gas pipeline respectively, and pressure monitoring is respectively performed on each battery box according to the obtained internal air pressure data of the battery box. That is, through the above operations, it is possible to regularly perform pressure monitoring on each battery box of the whole vehicle. That is, the operation of sequentially obtaining the internal air pressure data of each battery box within a single monitoring cycle for pressure monitoring is repeated every once in a while.

[0039] Embodiment of the pressure monitoring system for the battery box This embodiment provides a technical solution for a pressure monitoring system of a battery box. In this embodiment, the pressure monitoring method of the battery box in the embodiment of the pressure monitoring method of the battery box is adopted, and the pressure monitoring method of the battery box can be realized.

[0040] Since the specific working mode and working principle of the pressure monitoring system of the battery box in this embodiment have been described in detail in the above-mentioned embodiment of the pressure monitoring method of the battery box, they will not be elaborated here.

[0041] Embodiment of the airtightness monitoring method of the battery box This embodiment provides a technical solution for the airtightness monitoring method of the battery box. The main idea of this method is: by constructing the corresponding relationship between each battery box of the whole vehicle and the same pressure sensor, it is possible to inflate a single battery box to be monitored in the whole vehicle by connecting the gas pipeline connecting the single battery box to be monitored in the whole vehicle and the air pressure sensor, and obtain the internal air pressure data of any battery box in the whole vehicle through this pressure sensor, so as to conduct airtightness monitoring based on this data. And this method can ensure that when obtaining the internal air pressure data of the battery box, the internal air pressure data of other battery boxes will not be mixed to affect the airtightness monitoring result.

[0042] In this embodiment, the principle of using this method to realize the pressure monitoring of the battery box is as Figure 1 shown. The meaning of each component is the same as that in the above-mentioned embodiment of the pressure monitoring method of the battery box, and will not be elaborated here.

[0043] Specifically, this method includes: under the condition of connecting the gas pipeline connecting the single battery box to be monitored in the whole vehicle and the single air pressure sensor and shutting off the gas pipelines connecting other different single battery boxes in the whole vehicle and the air pressure sensor respectively, inflate the single battery box to be monitored in the whole vehicle by connecting the gas pipeline connecting the single battery box to be monitored in the whole vehicle and the air pressure sensor, and obtain the internal air pressure data of this battery box through this air pressure sensor, so as to conduct airtightness monitoring based on the obtained internal air pressure data of the battery box.

[0044] The method of inflating the single battery box to be monitored in the whole vehicle by connecting the gas pipeline connecting the single battery box to be monitored in the whole vehicle and the air pressure sensor, and obtaining the internal air pressure data of this battery box through this air pressure sensor, so as to conduct airtightness monitoring based on the obtained internal air pressure data of the battery box includes: Taking the airtightness monitoring of the battery box 02 by using this method as an example, in this case, the gas pipeline connecting the battery box 02 and the integrated pressure sensor 05 is connected, and the gas pipelines connecting other different single battery boxes of the whole vehicle to this pressure sensor are shut off respectively (that is, the gas pipelines of all other battery boxes and the integrated pressure sensor 05, for example, the gas pipeline between the battery box 01 and the integrated pressure sensor 05 in the figure is one of them). When the internal air pressure data of the battery box obtained through this pressure sensor during the inflation of the battery box 02 is such that the corresponding first air pressure value P1 is greater than the airtightness monitoring inflation threshold, then after shutting off the gas pipeline Ymin corresponding to the battery box 02 (that is, the second set duration), the gas pipeline corresponding to this battery box is opened again, and the corresponding second air pressure value P2 of the internal air pressure data of this battery box is obtained through this pressure sensor. If the difference between the second air pressure value and the first air pressure value (that is, the difference of P1 - P2) is less than the set pressure difference threshold, it is determined that the airtightness of the single battery box is qualified.

[0045] Since in the actual application process, it cannot be guaranteed that when the battery box 02 is inflated for the first time, the corresponding first air pressure value P1 of the internal air pressure data of this battery box satisfies the condition that P1 is greater than the airtightness monitoring inflation threshold (that is, not enough gas is inflated during the first inflation); and, the internal air pressure data of the battery box cannot be obtained through the pressure sensor during the inflation process; therefore, the method of inflating a single battery box until the corresponding first air pressure value of the internal air pressure data of this battery box obtained through this pressure sensor is greater than the airtightness monitoring inflation threshold includes the following steps: 1) During the first inflation, first inflate the battery box for a certain duration, and continue with step 2); 2) Pause the inflation, and determine whether the corresponding first air pressure value of the internal air pressure data of this battery box obtained through the pressure sensor is greater than the airtightness monitoring inflation threshold; if it is greater, stop the inflation, if it is not greater, then inflate the battery box for a certain duration (equivalent to supplementing air to this battery box) and then repeat step 2).

[0046] This airtightness monitoring method further includes: after the airtightness monitoring of one cycle of the battery box 02 is completed, each single battery box of the whole vehicle such as the battery box 01 is sequentially used as the battery box to be monitored, by respectively connecting the gas pipeline connecting the single battery box to be monitored of the whole vehicle and this pressure sensor, inflating the single battery box to be monitored, and obtaining the internal air pressure data of the battery box corresponding to each gas pipeline, and respectively performing airtightness monitoring on each battery box according to the obtained internal air pressure data of the battery box.

[0047] Embodiment of the airtightness monitoring system of the battery box This embodiment provides a technical solution for an airtightness monitoring system of a battery box. In this embodiment, the airtightness monitoring method of the battery box in the embodiment of the airtightness monitoring method of the battery box is adopted, and the airtightness monitoring of the battery box can be realized.

[0048] Since the specific working mode and working principle of the airtightness monitoring system of the battery box in this embodiment have been described in detail in the above embodiment of the airtightness monitoring method of the battery box, they will not be elaborated here.

[0049] It should be understood that the above specific embodiments of the present invention are only used for exemplary illustration or explanation of the principle of the present invention, and do not constitute a limitation on the present invention.

Claims

1. A pressure monitoring method for a battery box, characterized in that: include: Under the condition that the gas pipeline used to connect a single battery box to be monitored in the whole vehicle and a single air pressure sensor is connected, and other gas pipelines used to connect other different single battery boxes in the whole vehicle and the air pressure sensor are turned off, the internal air pressure data of the battery box corresponding to the gas pipeline is obtained through the air pressure sensor, so as to perform pressure monitoring based on the obtained internal air pressure data of the battery box.

2. The pressure monitoring method of the battery box according to claim 1, characterized in that: Each of the gas pipelines used to connect different single battery boxes of the whole vehicle with the same air pressure sensor includes: a switch valve used to connect or shut down the gas pipeline between the corresponding single battery box and the same air pressure sensor.

3. The pressure monitoring method of the battery box according to claim 1 or 2, characterized in that: Methods for pressure monitoring based on the internal air pressure data of the battery box include: After obtaining the air pressure data, if the air pressure value determined according to the air pressure data remains within the set threshold range within a first set time period, the air pressure value is compared with the set thermal runaway threshold; if the air pressure value is greater than the thermal runaway threshold, it is determined that the battery box corresponding to the air pressure data is a battery box that has a thermal runaway risk and needs to be checked.

4. The pressure monitoring method of the battery box according to claim 3, characterized in that: Also includes: Each individual battery box of the vehicle is used as a battery box to be monitored in turn, so as to obtain the internal air pressure data of the battery box corresponding to each gas pipeline respectively, and perform pressure monitoring on each battery box according to the obtained internal air pressure data of the battery box; After each pressure monitoring of each battery box, a period of time will be allowed to pass, and then each individual battery box of the vehicle will be used as a battery box to be monitored in turn, so as to re-obtain the internal air pressure data of the battery box corresponding to each gas pipeline, and pressure monitoring of each battery box will be performed based on the obtained internal air pressure data of the battery box.

5. A pressure monitoring system for a battery box, characterized in that: include: A gas pipeline used to connect a single battery box to be monitored on the vehicle and a single air pressure sensor; Other gas pipelines are used to connect different individual battery boxes of the vehicle and the air pressure sensor; Under the condition that the gas pipeline used to connect a single battery box to be monitored in the whole vehicle and a single air pressure sensor is controlled to be connected, and other gas pipelines respectively used to connect other different single battery boxes in the whole vehicle and the air pressure sensor are controlled to be shut down, the internal air pressure data of the battery box corresponding to the gas pipeline is obtained by controlling the air pressure sensor, so as to control the pressure monitoring according to the obtained internal air pressure data of the battery box.

6. The pressure monitoring system for the battery box according to claim 5, characterized in that: Each of the gas pipelines used to connect different single battery boxes of the whole vehicle with the same air pressure sensor includes: a switch valve used to connect or shut down the gas pipeline between the corresponding single battery box and the same air pressure sensor.

7. The pressure monitoring system for the battery box according to claim 5 or 6, characterized in that: Methods for pressure monitoring based on the internal air pressure data of the battery box include: After obtaining the air pressure data, if the air pressure value determined according to the air pressure data remains within the set threshold range within a first set time period, the air pressure value is compared with the set thermal runaway threshold; if the air pressure value is greater than the thermal runaway threshold, it is determined that the battery box corresponding to the air pressure data is a battery box that has a thermal runaway risk and needs to be checked.

8. The pressure monitoring system for the battery box according to claim 7, characterized in that: Also includes: Each individual battery box of the vehicle is used as a battery box to be monitored in turn, so as to obtain the internal air pressure data of the battery box corresponding to each gas pipeline respectively, and perform pressure monitoring on each battery box according to the obtained internal air pressure data of the battery box; After each pressure monitoring of each battery box, a period of time will be allowed to pass, and then each individual battery box of the vehicle will be used as a battery box to be monitored in turn, so as to re-obtain the internal air pressure data of the battery box corresponding to each gas pipeline, and pressure monitoring of each battery box will be performed based on the obtained internal air pressure data of the battery box.

9. A method for monitoring the air tightness of a battery box, characterized in that: Under the condition that the gas pipeline used to connect a single battery box to be monitored in the whole vehicle and a single air pressure sensor is connected, and other gas pipelines used to connect other different single battery boxes in the whole vehicle and the air pressure sensor are turned off, the single battery box to be monitored is inflated by connecting the gas pipeline used to connect the single battery box to be monitored in the whole vehicle and the air pressure sensor, and the internal air pressure data of the battery box is obtained through the air pressure sensor, so as to perform air tightness monitoring based on the obtained internal air pressure data of the battery box.

10. The method for monitoring the air tightness of a battery box according to claim 9, characterized in that: Each of the gas pipelines used to connect different single battery boxes of the whole vehicle with the same air pressure sensor includes: a switch valve used to connect or shut down the gas pipeline between the corresponding single battery box and the same air pressure sensor.

11. The method for monitoring the air tightness of a battery box according to claim 9 or 10, characterized in that: The method of connecting a single battery box to be monitored of the whole vehicle with the gas pipeline and the gas pressure sensor, inflating the single battery box to be monitored, and obtaining the internal gas pressure data of the battery box through the gas pressure sensor, and performing air tightness monitoring according to the obtained internal gas pressure data of the battery box includes: When the single battery box is inflated to a point where the first air pressure value corresponding to the internal air pressure data of the battery box obtained by the air pressure sensor is greater than the air tightness monitoring inflation threshold, the gas pipeline corresponding to the battery box is closed for a second set time period, and then the gas pipeline corresponding to the battery box is opened again, and the second air pressure value corresponding to the internal air pressure data of the battery box is obtained through the air pressure sensor. If the difference between the second air pressure value and the first air pressure value is less than the set pressure difference threshold, the air tightness of the single battery box is judged to be qualified.

12. The method for monitoring the air tightness of a battery box according to claim 11, characterized in that: Also includes: Each individual battery box of the whole vehicle is taken as a battery box to be monitored in turn, and the gas pipeline used to connect the individual battery box to be monitored of the whole vehicle and the air pressure sensor is respectively connected to fill the individual battery box to be monitored, and the internal air pressure data of the battery box corresponding to each gas pipeline is obtained, and the air tightness of each battery box is monitored according to the obtained internal air pressure data of the battery box.

13. A battery box air tightness monitoring system, characterized in that: include: A gas pipeline used to connect a single battery box to be monitored on the vehicle and a single air pressure sensor; Other gas pipelines are used to connect different individual battery boxes of the vehicle and the air pressure sensor; Under the condition that the gas pipeline used to connect a single battery box to be monitored in the whole vehicle and a single air pressure sensor is controlled to be connected, and other gas pipelines respectively used to connect other different single battery boxes in the whole vehicle and the air pressure sensor are controlled to be shut down, the single battery box to be monitored is inflated by connecting the gas pipeline used to connect the single battery box to be monitored in the whole vehicle and the air pressure sensor, and the internal air pressure data of the battery box is obtained by controlling the air pressure sensor, so as to control the air tightness monitoring according to the obtained internal air pressure data of the battery box.

14. The air tightness monitoring system for a battery box according to claim 13, characterized in that: Each of the gas pipelines used to connect different single battery boxes of the whole vehicle with the same air pressure sensor includes: a switch valve used to connect or shut down the gas pipeline between the corresponding single battery box and the same air pressure sensor.

15. The air tightness monitoring system for a battery box according to claim 13 or 14, characterized in that: The method of controlling the connection of a gas pipeline for connecting a single battery box to be monitored of the whole vehicle and the air pressure sensor, controlling the filling of the single battery box to be monitored, and controlling the acquisition of internal air pressure data of the battery box through the air pressure sensor to control air tightness monitoring according to the acquired internal air pressure data of the battery box includes: When the single battery box is inflated to a point where the first air pressure value corresponding to the internal air pressure data of the battery box obtained by the air pressure sensor is greater than the air tightness monitoring inflation threshold, the gas pipeline corresponding to the battery box is closed for a second set time period, and then the gas pipeline corresponding to the battery box is opened again, and the second air pressure value corresponding to the internal air pressure data of the battery box is obtained through the air pressure sensor. If the difference between the second air pressure value and the first air pressure value is less than the set pressure difference threshold, the air tightness of the single battery box is judged to be qualified.

16. The air tightness monitoring system for a battery box according to claim 15, characterized in that: Also includes: Each individual battery box of the whole vehicle is taken as a battery box to be monitored in turn, and the gas pipeline used to connect the individual battery box to be monitored of the whole vehicle and the air pressure sensor is respectively connected to fill the individual battery box to be monitored, and the internal air pressure data of the battery box corresponding to each gas pipeline is obtained, and the air tightness of each battery box is monitored according to the obtained internal air pressure data of the battery box.

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