Pressure regulation system and method, thermal runaway management system, and battery pack

Abstract

A pressure regulation system (100) and method, a thermal runaway management system (10), and a battery pack. The pressure regulation system (100) comprises a gas collection line (101), a vent valve (102) and a balance valve (103), wherein the gas collection line (101) is arranged outside the battery pack, two ends of the vent valve (102) respectively communicate with one end of the gas collection line (101) and the interior of the battery pack, and two ends of the balance valve (103) respectively communicate with the interior of the battery pack and the external environment of the battery pack.

Description

Pressure regulating system and method, thermal runaway management system, battery pack

[0001]

[0002] The present application claims priority to Chinese Patent Application No. 202411283362.6 and 202422247579.3, filed on September 12, 2024, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, in particular to a pressure regulating system and method, a thermal runaway management system, and a battery pack. BACKGROUND

[0004] Thermal runaway refers to a phenomenon in which, under certain conditions (such as high temperature, overcharging, internal short circuit, etc.), the internal chemical reaction of a battery is out of control, generating a large amount of heat and possibly causing a fire or explosion. Specifically, a short circuit occurs inside the battery, causing the electrolyte to burn or explode, or the positive electrode material decomposes at high temperatures to generate oxygen, exacerbating heat accumulation, or the negative electrode material reacts violently with the electrolyte, causing the temperature to rise rapidly, in addition, over-discharge of the battery can cause internal pressure to decrease, all of which can cause thermal runaway.

[0005] In related art, after the battery in the battery pack experiences thermal runaway, a large amount of toxic and flammable gas is generated and discharged into the battery pack. The accumulation of gas in the battery pack can pose an explosion risk. Therefore, an emergency fan is used to exhaust the interior of the battery pack to reduce the concentration of the gas. SUMMARY

[0006] However, when using an emergency fan to exhaust the interior of the battery pack, not only is it necessary to increase the measurement device for harmful gas concentration in the interior of the battery pack to ensure the current concentration value, but also the explosion-proof requirement for the measurement device is high.

[0007] In a first aspect, the present application provides a pressure regulating system, comprising:

[0008] A gas collection pipeline is provided outside the battery pack.

[0009] A gas permeable valve is provided, one end of the gas permeable valve is in communication with one end of the gas collection pipeline, and the other end of the gas permeable valve is in communication with the interior of the battery pack.

[0010] A balance valve is provided, one end of the balance valve is in communication with the interior of the battery pack, and the other end of the balance valve is in communication with the outside of the battery pack.

[0011] In a second aspect, the present application provides a pressure regulating system, comprising:

[0012] The air flow assembly is arranged outside the battery pack and communicates with the inside of the battery pack.

[0013] The balance valve has one end communicating with the inside of the battery pack and the other end communicating with the outside of the battery pack.

[0014] In a third aspect, the application provides a pressure regulating method applied to a thermal runaway management system, the thermal runaway management system comprising a pressure regulating system and a fire-fighting assembly.

[0015] The pressure regulating system comprises a balance valve and an air flow assembly, one end of the air flow assembly communicating with the inside of the battery pack and the other end communicating with the outside of the battery pack, one end of the balance valve communicating with the inside of the battery pack and the other end communicating with the outside of the battery pack; the pressure regulating method comprises:

[0016] controlling the air flow assembly to be opened;

[0017] After a preset first time, acquiring first collection information of the fire-fighting assembly in the battery pack;

[0018] If the first collection information is preset first information, opening the balance valve;

[0019] If it is detected that the balance valve is opened, generating a closing instruction of the air flow assembly.

[0020] In a fourth aspect, the application further provides a thermal runaway management system comprising the pressure regulating system provided in the first aspect.

[0021] In a fifth aspect, the application further provides a battery pack comprising the thermal runaway management system provided in the third aspect. Advantages

[0022] The pressure regulating system provided by the application comprises a gas collection pipeline, a breather valve and a balance valve, the gas collection pipeline is arranged outside the battery pack, one end of the breather valve communicates with one end of the gas collection pipeline, the other end of the breather valve communicates with the inside of the battery pack, one end of the balance valve communicates with the inside of the battery pack and the other end of the balance valve communicates with the outside of the battery pack, so that after the thermal runaway of the battery cell in the battery pack, the gas generated by the thermal runaway can be sequentially discharged through the breather valve and the gas collection pipeline, and it is not necessary to additionally increase a harmful gas concentration measuring device in the battery pack, and the air pressure in the battery pack can be regulated through the balance valve, so that the battery pack is prevented from being secondarily damaged due to deformation.

[0023] The pressure regulating system provided in the application comprises an airflow assembly and a balance valve, the airflow assembly is arranged outside a battery pack and communicates with the inside of the battery pack, one end of the balance valve communicates with the inside of the battery pack, and the other end of the balance valve communicates with the outside of the battery pack, the airflow assembly can be opened after thermal runaway of a cell in the battery pack to reduce the gas pressure in a gas collection pipeline, and the balance valve can be opened after the thermal runaway of the cell in the battery pack is controlled and waste gas in the battery pack is discharged, thereby the gas pressure in the battery pack can be regulated to avoid secondary damage to the deformation of the battery pack.

[0024] The pressure regulating method provided in the application can directly control the opening of the airflow assembly to quickly discharge the gas generated by thermal runaway from the inside of the battery pack after thermal runaway of a cell in the battery pack without additionally increasing a measuring device of harmful gas concentration in the battery pack, and first collection information of a fire-fighting assembly in the battery pack is acquired after a preset first time, the balance valve is opened if the first collection information is preset first information, a closing instruction of the airflow assembly is generated after the opening of the balance valve is detected, and the gas pressure in the battery pack is regulated through the balance valve to avoid secondary damage to the deformation of the battery pack due to too low gas pressure, thereby greatly improving the safety and reliability of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 is a first schematic block diagram of the pressure regulating system provided in the application;

[0026] Fig. 2 is a second schematic block diagram of the pressure regulating system provided in the application;

[0027] Fig. 3 is a third schematic block diagram of the pressure regulating system provided in the application;

[0028] Fig. 4 is a fourth schematic block diagram of the pressure regulating system provided in the application;

[0029] Fig. 5 is a circuit diagram in which the airflow assembly is arranged;

[0030] Fig. 6 is a schematic block diagram of the thermal runaway management system provided in the application;

[0031] Fig. 7 is a flowchart of the pressure regulating method provided in the application.

[0032] EXPLANATION OF REFERENCE NUMERALS:

[0033] 10, thermal runaway management system; 100, pressure regulating system; 101, gas collection pipeline; 102, breather valve; 103, balance valve; 104, gas flow assembly; 105, control circuit; 1051, first switch; 1052, second switch; 1053, third switch; 1054, fourth switch; 106, backup power supply; 200, fire control assembly; 201, smoke detector; 202, fire extinguishing module; 203, fire control module; 300, battery monitoring circuit; 301, cell monitoring module; 302, temperature monitoring circuit; 20, cell. Embodiments of the present application

[0034] Embodiments of the present application provide a pressure regulating system and method, a thermal runaway management system, and a battery pack.

[0035] For ease of understanding, the present application first introduces the pressure regulating system, the thermal runaway management system and the battery pack, and then introduces the pressure regulating method in detail based on the pressure regulating system and the thermal runaway management system.

[0036] Please refer to FIG. 1, which is a first schematic block diagram of the pressure regulating system provided by an embodiment of the present application. As shown in FIG. 1, the present application provides a pressure regulating system 100, which comprises:

[0037] The gas collection pipeline 101 is arranged outside the battery pack.

[0038] The breather valve 102 is in communication with one end of the gas collection pipeline 101 and the other end of the breather valve 102 is in communication with the inside of the battery pack.

[0039] The balance valve 103 is in communication with the inside of the battery pack at one end and in communication with the outside of the battery pack at the other end.

[0040] In the present embodiment, the gas collection pipeline 101 is arranged outside the battery pack. The gas collection pipeline 101 can be provided with multiple gas collection inlets, each of which can be in communication with a breather valve 102, thereby ensuring that the gas generated by the thermal runaway of a cell 20 in a certain battery pack of the energy storage system can be discharged in time through the breather valve 102 on the box of the battery pack. The breather valve 102 can be opened during the generation of the gas by the thermal runaway of the cell 20, thereby enabling the gas generated by the thermal runaway of the cell 20 to be discharged in time from the battery pack and discharged in a targeted manner, which can prevent the exhaust gas from being directly discharged into the air, thereby reducing the harm to the environment and the human body.

[0041] The breather valve 102 is a device for balancing the pressure inside and outside the sealed equipment, preventing moisture, dust and other contaminants from entering, and mainly functions to maintain good air permeability while preventing the intrusion of water droplets, drizzle, fine impurities and chemicals.

[0042] The balancing valve 103 is arranged on the box where the battery pack is located and communicates with the inside of the battery pack. The balancing valve 103 can be opened after the thermal runaway of the battery cell 20 in the battery pack is controlled and the exhaust gas in the battery pack is discharged, so as to adjust the air pressure in the battery pack and avoid secondary damage to the deformation of the battery pack. The balancing valve can be divided into three types: static balancing valve 103, dynamic balancing valve 103 and pressure-independent balancing valve 103.

[0043] In addition, the balancing valve 103 can also be opened during the thermal runaway of the battery cell 20 in the battery pack and the exhaust gas discharge process in the battery pack to avoid secondary damage to the deformation of the battery pack, greatly improving the safety and reliability of the battery pack. It should be noted that the opening of the balancing valve 103 can be selected according to actual application, which is not limited in the present application.

[0044] The pressure regulating system 100 provided by the present application includes a gas collection pipeline 101, a breather valve 102 and a balancing valve 103. The gas collection pipeline 101 is arranged outside the battery pack, one end of the breather valve 102 communicates with one end of the gas collection pipeline 101, the other end of the breather valve 102 communicates with the inside of the battery pack, one end of the balancing valve 103 communicates with the inside of the battery pack, and the other end of the balancing valve 103 communicates with the outside of the battery pack. Thus, after the thermal runaway of the battery cell 20 in the battery pack, the gas generated by the thermal runaway can be sequentially discharged through the breather valve 102 and the gas collection pipeline 101, without the need for additional measurement equipment of harmful gas concentration in the battery pack, and the air pressure in the battery pack can also be adjusted by the balancing valve 103 to avoid secondary damage to the deformation of the battery pack.

[0045] In some embodiments, as shown in FIG. 2, the pressure regulating system 100 further includes an air flow assembly 104 configured to sequentially discharge the gas in the battery pack through the breather valve 102 and the gas collection pipeline 101.

[0046] In the present embodiment, the air flow assembly 104 can be a fan, and the power required for the operation of the air flow assembly 104 can be provided by the battery pack. At the same time, the air flow assembly 104 can be opened after the thermal runaway of the battery cell 20 in the battery pack, so as to reduce the air pressure in the gas collection pipeline 101. At this time, the thermal runaway of the battery cell 20 causes the air pressure in the battery pack to be relatively high, and thus the breather valve 102 is opened, so that the exhaust gas generated by the thermal runaway can be sequentially discharged through the breather valve 102 and the gas collection pipeline 101, thereby preventing the exhaust gas from being directly discharged into the air, and reducing the harm to the environment and the human body.

[0047] In some embodiments, as shown in FIG. 3, the application provides a pressure regulating system, comprising:

[0048] The airflow assembly 104 is arranged outside the battery pack and communicates with the inside of the battery pack.

[0049] The balance valve 103 communicates with the inside of the battery pack at one end, and communicates with the outside of the battery pack at the other end.

[0050] In this embodiment, the airflow assembly 104 can prevent the fan, and the power required for the operation of the airflow assembly 104 can be provided by the battery pack. At the same time, the airflow assembly 104 can be started after the thermal runaway of the battery cell 20 in the battery pack, so as to reduce the internal pressure of the gas collection pipeline 101, so that the exhaust gas generated by the thermal runaway can be discharged by the gas collection pipeline 101 and the breather valve 102, thereby preventing the exhaust gas from being directly discharged into the air, thereby reducing the harm to the environment and the human body.

[0051] Specifically, the balance valve 103 can be opened after the thermal runaway of the battery cell 20 in the battery pack is controlled and the exhaust gas in the battery pack is discharged, thereby adjusting the air pressure in the battery pack and avoiding secondary damage to the deformation of the battery pack. The balance valve can be divided into three types: static balance valve 103, dynamic balance valve 103 and pressure-independent balance valve 103. It should be noted that the opening of the balance valve 103 can be selected according to actual application, and the application does not make specific limitation.

[0052] The pressure regulating system 100 provided by the application comprises a balance valve 103 and an airflow assembly 104, the gas collection pipeline 101 is arranged outside the battery pack, one end of the balance valve 103 communicates with the inside of the battery pack, and the other end of the balance valve 103 communicates with the outside of the battery pack, so that after the thermal runaway of the battery cell 20 in the battery pack, the airflow assembly 104 can be started after the thermal runaway of the battery cell 20 in the battery pack, to reduce the internal pressure of the gas collection pipeline 101, and at the same time, the air pressure in the battery pack is adjusted by the balance valve 103, so as to avoid secondary damage to the deformation of the battery pack.

[0053] In some embodiments, as shown in FIG. 2, the pressure regulating system further comprises a breather valve and a gas collection pipeline; wherein one end of the breather valve communicates with the inside of the battery pack, the other end of the breather valve communicates with one end of the gas collection pipeline, the airflow assembly is arranged at the other end of the gas collection pipeline, and the gas collection pipeline is arranged outside the battery pack.

[0054] In the embodiment, the gas collection pipeline 101 is arranged outside the battery pack, the gas collection pipeline 101 can be provided with a plurality of gas collection inlets and is in communication with the gas permeable valve 102, and thus the gas generated by the thermal runaway of the battery cell 20 can be discharged in time through the gas permeable valve 102 on the box of the battery pack, the gas permeable valve 102 can be opened during the process of collecting the gas generated by the thermal runaway of the battery cell 20 by the gas collection pipeline 101, and thus the gas generated by the thermal runaway of the battery cell 20 can be discharged in time from the battery pack and discharged in a targeted manner, which can prevent the exhaust gas from being directly discharged into the air, thereby reducing the harm to the environment and human body.

[0055] In some embodiments, as shown in FIG. 4, the pressure regulating system 100 further includes a control circuit 105, which is electrically connected to the airflow assembly 104 and is configured to control the start and stop of the airflow assembly 104.

[0056] In the embodiment, the control circuit 105 is electrically connected to the battery cell monitoring module 301, the airflow assembly 104 and the backup power supply 106 respectively. The battery cell monitoring module 301 can open the airflow assembly 104 through the control circuit 105, and when the battery pack cannot provide power for the airflow assembly 104, the backup power supply 106 can supply power for the airflow assembly 104 through the control circuit 105, so as to ensure that the airflow assembly 104 can be opened after the thermal runaway of the battery cell 20 in the battery pack, so as to reduce the internal gas pressure of the gas collection pipeline 101, and thus the exhaust gas generated by the thermal runaway can be discharged in a targeted manner through the gas permeable valve 102 and the gas collection pipeline 101.

[0057] In some embodiments, the pressure regulating system 100 further includes a first power supply; as shown in FIG. 5, the control circuit 105 includes a first switch 1051, one end of the first switch 1051 is electrically connected to the positive electrode of the first power supply, the other end of the first switch 1051 is electrically connected to the airflow assembly 104; and the negative electrode of the first power supply is electrically connected to the airflow assembly 104.

[0058] In the embodiment, the first power supply can be a power supply, which can be provided by the battery pack. When the battery cell 20 in the battery pack is in thermal runaway, the battery management system can control the first switch 1051 to be closed to start the airflow assembly 104, so as to reduce the internal gas pressure of the gas collection pipeline 101, and thus the exhaust gas generated by the thermal runaway can be discharged in a targeted manner through the gas permeable valve 102 and the gas collection pipeline 101, which can prevent the exhaust gas from being directly discharged into the air, thereby reducing the harm to the environment and human body.

[0059] In some embodiments, the pressure regulating system 100 further comprises a second power supply; as shown in FIG. 4, the control circuit 105 further comprises a second switch 1052, a third switch 1053 and a fourth switch 1054, one end of the second switch 1052 is electrically connected to the battery management system, the other end of the second switch 1052 is electrically connected to the negative pole of the first power supply and the airflow assembly 104 respectively; one end of the third switch 1053 is electrically connected to the battery management system and one end of the second switch 1052 respectively, the other end of the third switch 1053 is electrically connected to the positive pole of the second power supply; one end of the fourth switch 1054 is electrically connected to one end of the third switch 1053, the other end of the fourth switch 1054 is electrically connected to the airflow assembly 104; the negative pole of the second power supply is electrically connected to the airflow assembly 104.

[0060] In the present embodiment, the second power supply can be a backup power supply 106, which can provide power to the airflow assembly 104 when the battery pack cannot provide power to the airflow assembly 104, ensuring that the airflow assembly 104 can continue to operate to reduce the internal gas pressure of the gas collection pipeline 101, so that the waste gas generated by thermal runaway can be sequentially directed to be discharged by the breather valve 102 and the gas collection pipeline 101, so as to prevent the waste gas from being directly discharged into the air, thereby reducing the harm to the environment and the human body.

[0061] Specifically, one end of the first switch 1051 is electrically connected to the positive pole V+ of the power supply, the other end of the first switch 1051 is electrically connected to the airflow assembly 104, one end of the first switch 1051 is electrically connected to the positive pole V+ of the power supply, the other end of the first switch 1051 is electrically connected to the airflow assembly 104, the negative pole V- of the power supply is electrically connected to the airflow assembly 104, one end of the second switch 1052 is electrically connected to the cell monitoring module 301, the other end of the second switch 1052 is electrically connected to the negative pole V- of the power supply and the airflow assembly 104 respectively, one end of the third switch 1053 is electrically connected to the battery management system and one end of the second switch 1052 respectively, the other end of the third switch 1053 is electrically connected to the positive pole of the backup power supply 106, one end of the fourth switch 1054 is electrically connected to one end of the third switch 1053, the other end of the fourth switch 1054 is electrically connected to the airflow assembly 104, and the negative pole of the backup power supply 106 is electrically connected to the airflow assembly 104.

[0062] In some embodiments, the control circuit 105 comprises a relay, the relay comprises a coil, and the relay is provided with at least four contacts, namely a first contact, a second contact, a third contact and a fourth contact, the first contact and the second contact can be used as a set of normally open contacts and can be understood as a first switch; the coil can be understood as a second switch; the third contact and the fourth contact can be used as a set of normally open contacts and can be understood as a third switch.

[0063] Specifically, one end of the coil is electrically connected to the slave board of the battery management system, the other end of the coil is electrically connected to the negative electrode of the first power supply, the first contact is electrically connected to the positive electrode of the first power supply, the second contact is electrically connected to the airflow assembly, the third contact is electrically connected to one end of the coil and one end of the fourth switch respectively, and the fourth contact is electrically connected to the positive electrode of the second power supply.

[0064] When it is needed to start the airflow assembly, the slave board of the battery management system sends a starting signal to the coil, so that the coil conducts electricity, so that the coil closes the first contact and the second contact, and closes the third contact and the fourth contact, thereby the first power supply and the second power supply can simultaneously supply power to the airflow assembly. When the first power supply and the second power supply simultaneously supply power to the airflow assembly, diodes are arranged at the first power supply and the second power supply to prevent the occurrence of current backflow.

[0065] In some embodiments, the fourth switch 1054 is configured to control the opening or closing of the valve of the air breather valve 102.

[0066] Specifically, the air breather valve 102 mentioned in the present application can control the fourth switch 1054 to be closed by the slave board of the battery management system in the battery pack after the thermal runaway of the battery cell 20 in the battery pack, so as to open the valve of the air breather valve 102, and then the gas in the battery pack can be directed to be discharged through the air breather valve 102.

[0067] In some embodiments, as shown in FIG. 6, the present application also provides a thermal runaway management system 10, which comprises the pressure regulating system 100 mentioned in the present application.

[0068] The thermal runaway management system 10 of the battery pack provided by the present application not only can realize the monitoring of the thermal runaway of the battery cell 20, but also can timely control the thermal runaway diffusion in the battery pack, and timely process the waste gas generated by the thermal runaway, thereby effectively improving the safety and reliability of the battery pack.

[0069] In some embodiments, as shown in FIG. 6, the thermal runaway management system 10 further comprises:

[0070] The battery monitoring circuit 300 is arranged in the battery pack and is electrically connected to the battery cell 20 in the battery pack;

[0071] The fire-fighting assembly 200 is arranged in the battery pack and is electrically connected to the battery monitoring circuit 300;

[0072] The battery monitoring circuit 300 is at least configured to monitor the temperature of the battery cell 20 and control the fire-fighting assembly 200 to perform fire extinguishing in the battery pack, and control the pressure regulating system 100 to collect the gas in the battery pack.

[0073] In the embodiment, the battery monitoring circuit 300 can monitor the temperature, voltage and current of the battery cell 20 in the battery pack to ensure that the battery operates within a safe range. The fire-fighting assembly 200 can directly extinguish the fire inside the battery pack when the battery cell 20 is in thermal runaway, thereby being able to quickly extinguish the battery cell 20 in the thermal runaway state and effectively prevent the battery pack from reigniting, reducing the risk of secondary damage caused by the battery pack.

[0074] The thermal runaway management system 10 provided in the application includes a battery monitoring circuit 300, a fire-fighting assembly 200 and a pressure regulation system 100. The battery monitoring circuit 300 and the fire-fighting assembly 200 are arranged inside the battery pack. The battery monitoring circuit 300 is electrically connected to the battery cell 20 in the battery pack. The fire-fighting assembly 200 is electrically connected to the battery monitoring circuit 300. The battery monitoring circuit 300 can be configured to monitor the temperature of the battery cell 20 and can control the fire-fighting assembly 200 to perform fire extinguishing inside the battery pack and control the gas collection assembly to collect the gas inside the battery pack after monitoring that the battery cell 20 is in thermal runaway. Not only the monitoring of the thermal runaway of the battery cell 20 is realized, but also the thermal runaway spreading in the battery pack can be timely controlled and the waste gas generated by the thermal runaway can be timely treated, effectively improving the safety and reliability of the battery pack.

[0075] In some embodiments, as shown in FIG. 6, the battery monitoring circuit 300 includes:

[0076] a battery cell monitoring module 301 electrically connected to the battery cell 20;

[0077] a temperature monitoring circuit 302 electrically connected to the battery cell monitoring module 301 and configured to monitor the temperature of the battery cell 20;

[0078] The battery cell monitoring module 301 is configured to monitor the state of the battery and control the fire-fighting assembly 200 to perform fire extinguishing inside the battery pack and control the pressure regulation system 100 to collect the gas inside the battery pack.

[0079] Specifically, the battery cell monitoring module 301 can monitor the temperature, voltage and current of the battery cell 20 in the battery pack to ensure that the battery operates within a safe range. The temperature monitoring circuit 302 can monitor the temperature of each battery cell 20 in the battery pack.

[0080] In addition, the battery cell monitoring module 301 can obtain the temperature monitored by the temperature monitoring circuit 302 on the battery cell 20 from the temperature monitoring circuit 302, and can further determine whether the battery cell 20 is in thermal runaway, thereby avoiding false judgment of the thermal runaway of the battery cell 20 and improving the accuracy of the thermal runaway monitoring of the battery cell 20.

[0081] In the embodiment, by arranging the cell monitoring module 301 and the temperature monitoring module in the battery pack at the same time, the misjudgment of thermal runaway of the cell 20 can be avoided, and the accuracy of the thermal runaway monitoring of the cell 20 is improved. At the same time, the cell monitoring module 301 can be a slave module of the battery management system. As an important part of the battery management system, the slave module undertakes multiple key tasks such as data acquisition, balance management, communication and thermal management, and is a key link to ensure the efficient and safe operation of the battery.

[0082] In some embodiments, the temperature monitoring circuit 302 includes a thermal switch; one end of the thermal switch is electrically connected to one end of the cell 20, and the other end of the thermal switch is electrically connected to the cell monitoring module 301.

[0083] Specifically, the thermal switch is an electromechanical temperature control device. When the temperature changes, the deformation of the active layer is greater than that of the passive layer, so that the whole of the bimetallic strip will bend to the passive layer side. The curvature of this composite material changes to produce deformation characteristics to realize current on-off. The thermal switch can change the on / off state according to the change of the environmental temperature, and is divided into positive temperature coefficient and negative temperature coefficient. It is applied to safety and control systems, monitors temperature and plays a control role on related devices. The thermal switch can be realized by using multiple technologies, including bimetallic switch, thermal reed switch, mercury switch, rod and tube switch with different temperature coefficients, and pneumatic switch.

[0084] When the temperature monitoring circuit 302 is used to monitor the temperature of the cell 20 in the battery pack, the thermal switch can be used to realize it. The cost of the thermal switch is low, and there is no risk of communication abnormality, thereby reducing the misjudgment of thermal runaway of the cell 20 and improving the accuracy of the thermal runaway monitoring of the cell 20. Each cell 20 in the battery pack is equipped with a thermal switch. When the cell 20 operates normally, the thermal switch is in a closed state; when the cell 20 is in thermal runaway, the temperature rises, and the thermal switch is disconnected at this time. At this time, the cell monitoring module 301 cannot receive the current signal or voltage information at the thermal switch, and thus it can be determined that the cell 20 is in thermal runaway.

[0085] In some embodiments, as shown in FIG. 6, the fire-fighting assembly 200 includes a smoke detector 201 and a fire extinguishing module 202; the smoke detector 201 and the fire extinguishing module 202 are electrically connected to the battery monitoring circuit 300, the smoke detector 201 is configured to detect smoke inside the battery pack, and the fire extinguishing module 202 is configured to perform fire extinguishing inside the battery pack.

[0086] Specifically, the smoke detector 201 is a device for monitoring the internal environment of the battery pack to prevent dangerous situations such as fire and overheating. The smoke detector 201 of the battery pack usually uses a photoelectric or ionic sensor to detect smoke and exhaust particles.

[0087] In this embodiment, each battery cell 20 in the battery pack can be correspondingly provided with a smoke detector 201. When a certain battery cell 20 in the battery pack is in thermal runaway, the corresponding smoke detector 201 can detect the smoke generated by the thermal runaway of the battery cell 20 to determine whether the battery cell 20 has occurred thermal runaway, thereby further reducing the false judgment of the thermal runaway of the battery cell 20 and improving the accuracy of the thermal runaway monitoring of the battery cell 20.

[0088] Meanwhile, after determining the thermal runaway of the battery cell 20, the fire extinguishing module 202 can be used for fire extinguishing to prevent the thermal runaway of the battery cell 20 from spreading and avoid other battery cells 20 in the battery pack that have not occurred thermal runaway from being affected, thereby effectively improving the safety and reliability of the battery pack.

[0089] In some embodiments, as shown in FIG. 6, the fire-fighting assembly 200 further includes a fire-fighting control module 203; wherein the fire-fighting control module 203 is electrically connected to the battery monitoring circuit 300, the smoke detector 201 and the fire extinguishing module 202 respectively, and the fire-fighting control module 203 is configured to control the fire extinguishing module 202 to perform fire extinguishing in the internal of the battery pack.

[0090] Specifically, the battery monitoring circuit 300 can obtain the smoke information monitored by the smoke detector 201 at the corresponding battery cell 20 through the fire-fighting control module 203, and then determine whether the battery cell 20 has occurred thermal runaway. Meanwhile, after determining the thermal runaway of the battery cell 20, the battery monitoring circuit 300 can control the fire extinguishing module 202 to perform fire extinguishing through the fire-fighting control module 203 to prevent the thermal runaway of the battery cell 20 from spreading and avoid other battery cells 20 in the battery pack that have not occurred thermal runaway from being affected, thereby effectively improving the safety and reliability of the battery pack.

[0091] In some embodiments, the present application also provides a battery pack comprising the thermal runaway management system 10 mentioned in the present application.

[0092] In this embodiment, the battery pack is provided with a battery management system (BMS). The battery management system can ensure that the battery operates safely, reliably and efficiently under various charging and discharging and environmental conditions. The battery management system can prolong the service life of the battery and improve its performance by monitoring and managing the state parameters of the battery in real time, such as voltage, current, temperature, etc. At the same time, the battery pack can control the thermal runaway management system 10 through the battery management system, which can effectively improve the safety and reliability of the battery pack.

[0093] It can be understood that the pressure regulation system, thermal runaway management system and battery pack provided in the application are merely examples, and the pressure regulation system, thermal runaway management system and battery pack described in the embodiments of the application are used to more clearly illustrate the technical solutions of the embodiments of the application, and do not constitute a limitation on the technical solutions provided by the embodiments of the application. Those skilled in the art can know that the technical solutions provided by the embodiments of the application are also applicable to similar technical problems as the system evolves and new business scenarios appear.

[0094] It should be noted that the sequence of the following embodiments is not a limitation on the preferred order of the embodiments. The pressure regulation method is described in detail below. Meanwhile, the pressure regulation method provided by the application can be executed by the pressure regulation system, the thermal runaway management system or the battery management system of the battery pack.

[0095] Please refer to FIG. 7, which is a flowchart of the pressure regulation method provided by the application. As shown in FIG. 7, the pressure regulation method comprises steps S110-S140.

[0096] S110, control the airflow assembly to be opened;

[0097] S120, after a preset first time, acquire first collection information of the fire-fighting assembly in the battery pack;

[0098] S130, if the first collection information is preset first information, open the balance valve;

[0099] S140, if it is detected that the balance valve is opened, generate a closing instruction of the airflow assembly.

[0100] In this embodiment, after determining that the battery cell in the battery pack is in thermal runaway, the airflow assembly can be controlled to be opened to reduce the internal air pressure of the gas collection pipeline, so that the waste gas generated by the thermal runaway can be discharged in a targeted manner to prevent the waste gas from being directly discharged into the air, thereby reducing the harm to the environment and the human body.

[0101] Further, after the thermal runaway in the battery pack is processed, i.e., after the first time, the first collection information of the fire-fighting assembly in the battery pack can be acquired, i.e., the smoke information monitored by the smoke detector in the fire-fighting assembly in the battery pack, to determine whether the thermal runaway in the battery pack is controlled. If the thermal runaway in the battery pack is controlled, the balance valve can be opened to regulate the air pressure inside the battery pack to avoid secondary damage to the deformation of the battery pack, and the airflow assembly can be closed after it is detected that the balance valve is opened. If the thermal runaway in the battery pack is not controlled, the balance valve can also be opened to regulate the air pressure inside the battery pack to avoid secondary damage to the deformation of the battery pack, and the airflow assembly also needs to continue to work, so that the gas generated by the thermal runaway of the battery cell can be discharged from the battery pack in a timely manner and discharged in a targeted manner.

[0102] The opening of the balance valve is preferentially selected to be performed after the thermal runaway in the battery pack is controlled, so that the measurement device of the harmful gas concentration in the battery pack does not need to be additionally added, and the battery pack is also prevented from being secondarily damaged.

[0103] The first information can be information that the smoke concentration in the battery pack is lower than a preset concentration, that is, when the first collection information in the battery pack is that the smoke concentration in the battery pack is lower than the preset concentration, the balance valve can be opened, so that the air pressure inside and outside the battery pack is balanced, and the battery pack is prevented from being secondarily damaged. Meanwhile, the first information can also be information that the air pressure in the battery pack is lower than a preset air pressure, that is, when the first collection information in the battery pack is that the air pressure in the battery pack is lower than the preset air pressure, it is determined that the battery pack basically does not generate gas at this time, and the case of the battery pack reaches the limit at this time, and the case is about to be deformed. Therefore, the balance valve needs to be opened, so that the air pressure inside and outside the battery pack is balanced, and the battery pack is prevented from being secondarily damaged.

[0104] In some embodiments, the pressure regulating system further comprises a breather valve, one end of the breather valve being in communication with the inside of the battery pack, and the other end of the breather valve being in communication with the outside of the battery pack; the thermal runaway management system further comprises a battery monitoring circuit; wherein the step S110 comprises: obtaining second collection information of the battery monitoring circuit at the battery cell in the battery pack and third collection information of the fire-fighting assembly in the battery pack; if at least one of the second collection information and the third collection information is abnormal, determining a thermal runaway area in the battery pack; controlling the fire-fighting assembly to perform fire extinguishing in the thermal runaway area, and controlling the breather valve and the air flow assembly to be opened.

[0105] In the embodiment, the second collection information comprises voltage, current, temperature and other information collected by the battery cell monitoring module at the battery cell in the battery pack, and the third collection information comprises smoke concentration collected by the fire-fighting assembly in the inside of the battery pack. When the battery cell in the battery pack is in thermal runaway, the second collection information and the third collection information are obtained, and it is determined whether the temperature in the second collection information and the smoke concentration in the third collection information are abnormal, that is, whether at least one of the temperature, current, voltage of the battery cell and the smoke concentration in the battery pack is abnormal. If it is abnormal, it is determined that the battery cell in the battery pack is in thermal runaway.

[0106] Meanwhile, the second collection information and the third collection information both comprise position information of the battery cell. After the thermal runaway of the battery cell is determined, the position information of the battery cell in the second collection information and the third collection information is used to further determine the thermal runaway area, and the thermal runaway processing such as fire extinguishing processing is performed, so as to prevent the thermal runaway of the battery cell from spreading to other battery cells, thereby effectively improving the safety and reliability of the battery pack.

[0107] In addition, the control of the fire-fighting assembly to perform fire extinguishing in the thermal runaway area also needs to control the opening of the gas vent valve and the airflow assembly to control the gas collection assembly to collect the gas inside the battery pack, which can not only control the thermal runaway diffusion in the battery pack in time, but also can process the waste gas generated by the thermal runaway in time after the thermal runaway of the battery cell is triggered, thereby effectively improving the safety and reliability of the battery pack.

[0108] In some embodiments, the temperature monitoring circuit includes a plurality of thermal switches, each battery cell corresponds to a thermal switch, the battery pack is provided with a gas vent valve, and the gas collection assembly includes an airflow assembly and a gas collection pipeline; the control of the opening of the gas vent valve and the airflow assembly includes: starting the airflow assembly to reduce the pressure inside the gas collection pipeline; after a preset second time, acquiring fourth collection information of the battery cell that does not appear thermal runaway in the battery pack; if the fourth collection information is abnormal, opening the gas vent valve to sequentially discharge the gas in the battery pack through the gas vent valve and the gas collection pipeline.

[0109] In the embodiment, the gas collection pipeline is arranged outside the battery pack, one end of the gas vent valve is communicated with one end of the gas collection pipeline, the airflow assembly is arranged at the other end of the gas collection pipeline, and the other end of the gas vent valve is communicated with the inside of the battery pack.

[0110] In the process of controlling the gas collection assembly to collect the gas inside the battery pack, the airflow assembly can be started first to reduce the pressure inside the gas collection pipeline. Since the battery cell in the battery pack has thermal runaway, the pressure inside the battery pack is large, so a large pressure difference can be formed on both sides of the gas vent valve, thereby the gas vent valve can be opened more easily to quickly discharge the harmful gas generated in the battery pack.

[0111] Meanwhile, since the thermal runaway may spread in the battery pack, and when the thermal runaway spreads in the battery pack, the gas vent valve may still be in a closed state, it is also necessary to confirm whether the battery cell that does not appear thermal runaway has thermal runaway after a preset first time. The battery cell monitoring module may not be able to monitor the state of other battery cells that do not have thermal runaway. Therefore, the application preferably determines whether the battery cell that does not have thermal runaway has thermal runaway through the on-off information of the thermal switch at the battery cell that does not have thermal runaway, and then determines whether the thermal runaway spreads to other battery cells. If the thermal switch at the battery cell that does not have thermal runaway is disconnected, it can be determined that the thermal runaway spreads to other battery cells, at which time the gas vent valve needs to be opened immediately to quickly and timely discharge the gas in the battery pack through the gas vent valve and the gas collection pipeline.

[0112] In some embodiments, the battery monitoring circuit includes a cell monitoring module and a temperature monitoring circuit; wherein the second acquisition information of the battery monitoring circuit at the cell in the battery pack is obtained by respectively obtaining the first temperature information of the cell monitoring module at the cell and the second temperature information of the temperature monitoring circuit at the cell.

[0113] In the present embodiment, the second acquisition information includes the first temperature information and the second temperature information, and then the present application can determine whether the cell in the battery pack is thermal runaway by the first temperature information and the second temperature information, so as to reduce the probability of misjudgment of thermal runaway and improve the accuracy of thermal runaway judgment.

[0114] Specifically, if the first temperature information is that the temperature of the cell is higher than the preset temperature, it can be determined that the cell has a high probability of thermal runaway. In order to avoid misjudgment, it can be determined whether the second temperature information is the disconnection information of the thermal switch, i.e. whether the cell monitoring module detects whether there is current or voltage at the thermal switch to determine whether the thermal switch is disconnected. If it is disconnected, it can be determined that the cell at the corresponding position is thermal runaway.

[0115] In some embodiments, if at least one of the second acquisition information and the third acquisition information is abnormal, the thermal runaway area in the battery pack is determined by: if at least one of the first temperature information, the second temperature information and the third acquisition information is abnormal, the thermal runaway area in the battery pack is determined.

[0116] In the present embodiment, the position information of the cell in the battery pack that is thermal runaway is determined. After it is monitored that at least one of the first temperature information, the second temperature information and the third acquisition information is abnormal, the position information of the cell in the battery pack that is thermal runaway can be determined by at least one of the first temperature information, the second temperature information and the third acquisition information.

[0117] For example, if the first temperature information is abnormal, the position information of the cell in the battery pack that is thermal runaway can be determined by the first temperature information corresponding line, or the corresponding second temperature information is determined by the first temperature information corresponding line, and the position information of the cell in the battery pack that is thermal runaway is determined by the second temperature information corresponding line.

[0118] In some embodiments, if at least one of the first temperature information, the second temperature information and the third acquisition information is abnormal, the thermal runaway area in the battery pack is determined by: if at least two of the first temperature information, the second temperature information and the first acquisition information are abnormal, the thermal runaway area in the battery pack is determined.

[0119] Specifically, in order to ensure that the battery cell thermal runaway is misjudged, the application can determine whether the battery cell in the battery pack is thermal runaway by determining whether at least two of the first temperature information, the second temperature information and the third acquisition information are abnormal, and then determine the thermal runaway area and perform thermal runaway processing, such as fire extinguishing processing, to prevent the thermal runaway of the battery cell from spreading to other battery cells, thereby effectively improving the safety and reliability of the battery pack.

[0120] For example, if the first temperature information and the second temperature information are abnormal, it can be determined that the battery cell in the battery pack is thermal runaway; or if the first temperature information and the third acquisition information are abnormal, it can be determined that the battery cell in the battery pack is thermal runaway; or if the second temperature information and the third acquisition information are abnormal, it can be determined that the battery cell in the battery pack is thermal runaway; or if the first temperature information, the second temperature information and the third acquisition information are abnormal, it can be determined that the battery cell in the battery pack is thermal runaway.

[0121] In some embodiments, the temperature monitoring circuit includes a thermal switch; before determining the thermal runaway area in the battery pack, further comprising: if the first temperature information is that the temperature of the battery cell is higher than the preset temperature, determining that the battery cell is thermal runaway; if the second temperature information is that the thermal switch is disconnected, determining that the battery cell at the thermal switch is thermal runaway; if the third acquisition information is the second information, determining that the battery cell in the battery pack is thermal runaway.

[0122] In the present embodiment, the temperature monitoring circuit includes a plurality of thermal switches, each battery cell corresponds to a thermal switch, the first temperature information is the temperature information monitored by the battery cell monitoring module at the battery cell, if the temperature information shows that the temperature of the battery cell is higher than the preset temperature, it can be determined that the battery cell at the corresponding position is thermal runaway; the second temperature information is the on-off information of the thermal switch in the temperature monitoring circuit, if the on-off information shows that the thermal switch is disconnected, it can be determined that the battery cell at the corresponding position is thermal runaway; the third acquisition information is the smoke information monitored by the smoke alarm in the fire-fighting assembly in the battery pack, if the smoke information shows that the smoke concentration in the battery pack is higher than the preset threshold, i.e. the third acquisition information is the second information, it can be determined that the battery cell in the battery pack is thermal runaway.

[0123] In some embodiments, the temperature monitoring circuit includes a thermal switch; before determining the thermal runaway area in the battery pack, further comprising: if the first temperature information is that the temperature of the battery cell is higher than the preset temperature, determining whether the second temperature information is the disconnection information of the thermal switch; if the second temperature information is the disconnection information of the thermal switch, determining that the battery cell at the thermal switch is thermal runaway.

[0124] The application can determine whether the thermal runaway of the battery cell in the battery pack is abnormal according to the first temperature information and the second temperature information. Specifically, if the temperature of the battery cell is higher than the preset temperature according to the first temperature information, it can be determined that the battery cell has a high probability of thermal runaway. In order to avoid misjudgment, it can be determined whether the second temperature information is the disconnection information of the thermal switch, that is, whether the thermal switch is disconnected by detecting whether there is current or voltage at the thermal switch in the battery cell monitoring module. If the thermal switch is disconnected, it can be determined that the battery cell at the corresponding position has thermal runaway.

[0125] In some embodiments, before determining the thermal runaway area in the battery pack, the method further comprises: if the temperature of the battery cell is higher than the preset temperature according to the first temperature information, determining whether the third acquisition information is the preset second information; and if the third acquisition information is the preset second information, determining the battery cell with thermal runaway in the battery pack.

[0126] Specifically, the application can also determine whether the thermal runaway of the battery cell in the battery pack is abnormal according to the first temperature information and the third acquisition information. Similarly, if the temperature of the battery cell is higher than the preset temperature according to the first temperature information, it can be determined that the battery cell has a high probability of thermal runaway. In order to avoid misjudgment, the battery cell can be further determined to have thermal runaway by the first acquisition information of the fire-fighting assembly in the battery pack. Specifically, it can be determined whether the third acquisition information is the preset second information. If the third acquisition information is the second information, it can be determined that the battery cell has thermal runaway.

[0127] In some embodiments, the temperature monitoring circuit comprises a thermal switch. Before determining the thermal runaway area in the battery pack, the method further comprises: if the second temperature information is the disconnection information of the thermal switch, determining whether the third acquisition information is the preset second information; and if the third acquisition information is the preset second information, determining the battery cell with thermal runaway in the battery pack.

[0128] Specifically, the application can also determine whether the thermal runaway of the battery cell in the battery pack is abnormal according to the second temperature information and the third acquisition information. If the second temperature information is the disconnection information of the thermal switch, it can be determined that the battery cell has a high probability of thermal runaway. In order to avoid misjudgment, the battery cell can be further determined to have thermal runaway by the third acquisition information of the fire-fighting assembly in the battery pack. Specifically, it can be determined whether the third acquisition information is the preset second information. If the third acquisition information is the second information, it can be determined that the battery cell has thermal runaway.

[0129] It should be noted that after obtaining the first temperature information, the second temperature information and the third acquisition information, any one of them can be used to determine whether the battery cell has thermal runaway. At the same time, in order to further improve the accuracy of thermal runaway, the other two or one can be used for further confirmation.

[0130] In some embodiments, determining the thermal runaway region in the battery pack comprises: obtaining position information of the battery cell; and determining the thermal runaway region in the battery pack according to the position information.

[0131] In the embodiment, after determining the battery cell that has thermal runaway in the battery pack, the thermal runaway region in the battery pack can be determined directly according to the position information of the battery cell, and then the fire extinguishing component corresponding to the region can be used to perform fire extinguishing to prevent the thermal runaway of the battery cell from spreading to other battery cells, thereby effectively improving the safety and reliability of the battery pack.

[0132] In some embodiments, determining the thermal runaway region in the battery pack comprises: if the first collection information is the first information, determining the position information of the smoke detector corresponding to the first information; and determining the battery cell that has thermal runaway in the battery pack according to the position information.

[0133] In the embodiment, the fire extinguishing component comprises a plurality of smoke detectors, and each battery cell can correspond to a smoke detector. When it is determined that the smoke information shows that the smoke concentration in the battery pack is higher than a preset threshold, i.e., the third collection information is the second information, it can be determined that there is a battery cell that has thermal runaway in the battery pack. In order to determine the position of the battery cell that has thermal runaway in the battery pack, the position information of the smoke detector that has smoke alarm can be obtained, and then the position of the battery cell that has thermal runaway in the battery pack can be determined according to the position information of the smoke detector, so that the fire extinguishing module can be used to extinguish the fire of the battery cell that has thermal runaway to prevent the thermal runaway of the battery cell from spreading to other battery cells, thereby effectively improving the safety and reliability of the battery pack.

[0134] In some embodiments, determining the battery cell that has thermal runaway in the battery pack according to the position information comprises: obtaining the first temperature information or / and the second temperature information at the position corresponding to the smoke detector, and determining the battery cell that has thermal runaway in the battery pack according to the first temperature information or / and the second temperature information.

[0135] Specifically, after the smoke detector has alarm, the first temperature information or / and the second temperature information at the position corresponding to the smoke detector can be used to further determine the battery cell that has thermal runaway, so as to avoid the situation of misjudgment of thermal runaway, thereby improving the accuracy of determining the battery cell that has thermal runaway.

[0136] In some embodiments, the temperature monitoring circuit comprises a thermal sensitive switch; and obtaining the fourth collection information of the battery cell that has not thermal runaway in the battery pack comprises: obtaining the on-off information of the thermal sensitive switch at the position of the battery cell that has not thermal runaway in the battery pack.

[0137] In the embodiment, the fourth acquisition information is the on-off information of the thermal switch at the battery cell that does not have thermal runaway. Since it is determined that there is a battery cell with thermal runaway in the battery pack, the state of other battery cells that do not have thermal runaway cannot be monitored by the cell monitoring module at this time. Therefore, the application preferably determines whether the battery cell that does not have thermal runaway has thermal runaway by the on-off information of the thermal switch at the battery cell that does not have thermal runaway, and further determines whether the thermal runaway spreads to other battery cells. If the thermal switch at the battery cell that does not have thermal runaway is disconnected, it can be determined that the thermal runaway spreads to other battery cells. At this time, the gas collection assembly needs to be controlled to collect the gas inside the battery pack and perform directional discharge, and at the same time, the fire extinguishing of all battery cells with thermal runaway needs to be continued until the thermal runaway of the battery cells is controlled.

[0138] In some embodiments, if the on-off information is the disconnection information of the thermal switch, it is determined that the battery cell that does not have thermal runaway in the battery pack is triggered to have thermal runaway. At this time, the gas flow assembly and the air permeable valve need to be turned on to perform directional discharge of the gas inside the battery pack, and at the same time, the fire extinguishing of all battery cells with thermal runaway needs to be continued until the thermal runaway of the battery cells is controlled.

[0139] Specifically, if the on-off information of the thermal switch is the closing information of the thermal switch, it can be determined that the thermal runaway does not spread. The gas collection assembly can be controlled to collect the gas inside the battery pack and perform directional discharge to prevent the exhaust gas from being directly discharged into the air, thereby reducing the harm to the environment and the human body. If the on-off information of the thermal switch is the disconnection information of the thermal switch, it can be determined that the thermal runaway spreads to other battery cells. At this time, the gas collection assembly needs to be controlled to collect the gas inside the battery pack and perform directional discharge, and at the same time, the fire extinguishing of all battery cells with thermal runaway needs to be continued until the thermal runaway of the battery cells is controlled.

[0140] In some embodiments, the pressure regulating system further comprises a control circuit, and the control circuit comprises a first switch. The control of the opening of the gas flow assembly comprises: controlling the first switch to be closed to open the gas flow assembly.

[0141] Specifically, the application preferably selects the battery pack to provide power for the gas flow assembly, that is, the battery pack can be controlled to supply power to the gas flow assembly by controlling the first switch to be closed, so that the gas flow assembly is opened, thereby enabling the gas generated by the thermal runaway inside the battery pack to be directionally discharged.

[0142] In some embodiments, the pressure regulating system further comprises an air permeable valve, and the control circuit further comprises a second switch, a third switch and a fourth switch. Controlling the first switch to be closed to open the gas flow assembly comprises: controlling the second switch to be in an energized state; and controlling the first switch and the third switch to be closed to open the gas flow assembly according to the energized second switch.

[0143] In the embodiment, the pressure regulating system is further provided with a second power supply, i.e., a backup power supply, the control circuit includes a relay and a fourth switch, the coil of the relay can serve as the second switch, the relay is provided with at least two groups of normally open contacts, one group of normally open contacts serves as the first switch, and the other group of normally open contacts can serve as the third switch. When the battery management system controls the coil to conduct electricity, the first switch and the third switch are closed, at this time, since the fourth switch is arranged between the positive pole of the second power supply and the airflow assembly, the fourth switch can be in an open state first, so that the battery pack supplies power to the airflow assembly.

[0144] After the first switch and the third switch are controlled to be closed to start the airflow assembly, if the battery pack cannot supply power to the airflow assembly due to thermal runaway, at this time, the fourth switch can be closed to start the air breather valve and the airflow assembly.

[0145] It should be noted that the other group of normally open contacts of the relay can serve as the third switch, mainly to enable the second power supply to continuously supply electricity to the coil of the relay through the third switch after the third switch is closed, so that the first power supply can supply power to the airflow assembly through the first switch, and the second power supply can continuously supply power to the airflow assembly through the third switch, ensuring that the airflow assembly will not be powered off in the started state.

[0146] It can be understood that the fourth switch can be directly controlled to be closed to start the air breather valve in advance while the coil of the relay is powered on to control the first switch and the third switch to be turned on, so that the first power supply and the second power supply can supply power to the airflow assembly at the same time.

[0147] The pressure regulating method provided by the application can directly control the airflow assembly to be started without adding a harmful gas concentration measuring device in the battery pack after the battery pack is in thermal runaway, so as to quickly discharge the gas generated by thermal runaway from the battery pack, and obtain the first collection information of the fire-fighting assembly in the battery pack after a preset first time; if the first collection information is a preset first information, the balance valve is started, and after it is detected that the balance valve is started, a closing instruction of the airflow assembly is generated, and the air pressure in the battery pack is adjusted through the balance valve, so as to avoid the battery pack from being deformed due to the air pressure being too low and being damaged again, thereby greatly improving the safety and reliability of the battery pack.

Claims

1. A pressure regulating system (100), comprising: a gas collection pipe (101) arranged outside a battery pack; a breather valve (102) having one end in communication with one end of the gas collection pipe (101) and the other end in communication with the inside of the battery pack; a balance valve (103) having one end in communication with the inside of the battery pack and the other end in communication with the outside of the battery pack.

2. The pressure regulating system (100) of claim 1, further comprising a gas flow assembly (104) configured to sequentially discharge the gas inside the battery pack through the breather valve (102) and the gas collection pipe (101).

3. The pressure regulating system (100) of claim 2, further comprising a control circuit (105) electrically connected to the gas flow assembly (104) and configured to control the gas flow assembly (104) to start and stop.

4. The pressure regulating system (100) of claim 3, further comprising a first power supply; the control circuit (105) comprises: a first switch (1051) having one end electrically connected to the positive pole of the first power supply and the other end electrically connected to the gas flow assembly (104); the negative pole of the first power supply is electrically connected to the gas flow assembly (104).

5. The pressure regulating system (100) of claim 4, further comprising a second power supply; the control circuit (105) further comprises: a second switch (1052) having one end electrically connected to a battery management system and the other end electrically connected to the negative pole of the first power supply and the gas flow assembly (104), respectively; a third switch (1053) having one end electrically connected to the battery management system and one end of the second switch (1052), and the other end electrically connected to the positive pole of the second power supply; a fourth switch (1054) having one end electrically connected to one end of the third switch (1053) and the other end electrically connected to the gas flow assembly (104); the negative pole of the second power supply is electrically connected to the gas flow assembly (104).

6. The pressure regulating system (100) of claim 5, wherein, the fourth switch (1054) is configured to control the opening or closing of the valve of the breather valve (102).

7. A pressure regulating system (100), comprising: a gas flow assembly (104) arranged outside a battery pack and in communication with the inside of the battery pack; a balance valve (103) having one end in communication with the inside of the battery pack and the other end in communication with the outside of the battery pack.

8. A thermal runaway management system (10) comprising the pressure regulating system (100) of any one of claims 1-7.

9. The thermal runaway management system (10) of claim 8, further comprising: a fire extinguishing assembly (200) disposed inside the battery pack and electrically connected to a battery monitoring circuit (300); the battery monitoring circuit (300) disposed inside the battery pack and electrically connected to the battery cell (20) inside the battery pack; wherein the battery monitoring circuit (300) is configured to at least monitor a temperature of the battery cell (20) and control the fire extinguishing assembly (200) to perform fire extinguishing inside the battery pack and control the pressure regulating system (100) to collect gas inside the battery pack.

10. The thermal runaway management system (10) of claim 9, wherein, the battery monitoring circuit (300) comprises: a battery cell monitoring module (301) electrically connected to the battery cell (20); a temperature monitoring circuit (302) electrically connected to the battery cell monitoring module (301) and configured to monitor a temperature of the battery cell (20); wherein the battery cell monitoring module (301) is configured to monitor a state of the battery and control the fire extinguishing assembly (200) to perform fire extinguishing inside the battery pack and control the pressure regulating system (100) to collect gas inside the battery pack.

11. A battery pack comprising the thermal runaway management system (10) of any one of claims 8-10.

12. A pressure regulating method applied to a thermal runaway management system (10), the thermal runaway management system (10) comprising a pressure regulating system (100) and a fire extinguishing assembly (200); the pressure regulating system (100) comprising a balance valve (103) and a gas flow assembly (104), one end of the gas flow assembly (104) being in communication with an inside of a battery pack, the other end of the gas flow assembly (104) being in communication with an outside of the battery pack, one end of the balance valve (103) being in communication with the inside of the battery pack, the other end of the balance valve (103) being in communication with the outside of the battery pack; the method comprising: controlling the gas flow assembly (104) to open; after a preset first time, obtaining first collection information of the fire extinguishing assembly (200) inside the battery pack; if the first collection information is preset first information, opening the balance valve (103); if it is detected that the balance valve (103) is opened, generating a closing instruction of the gas flow assembly (104).

13. The pressure regulating method of claim 12, wherein, the pressure regulating system (100) further comprising a gas permeable valve (102), one end of the gas permeable valve (102) being in communication with the inside of the battery pack, the other end of the gas permeable valve (102) being in communication with the outside of the battery pack; the thermal runaway management system (10) further comprising a battery monitoring circuit (300); the controlling the gas flow assembly (104) to open comprises: obtaining second collection information of the battery monitoring circuit (300) at the battery cell (20) inside the battery pack and obtaining third collection information of the fire extinguishing assembly (200) inside the battery pack; if at least one of the second collection information and the third collection information is abnormal, determining a thermal runaway area inside the battery pack; Control the fire-fighting assembly (200) to execute fire extinguishing in the thermal runaway area, and control the breather valve (102) and the air flow assembly (104) to open.

14. The pressure regulating method of claim 13, wherein, The pressure regulating system (100) further comprises a gas collection pipeline (101); the gas collection pipeline (101) is arranged outside the battery pack, and one end of the gas collection pipeline (101) is in communication with the other end of the breather valve (102); The control of the breather valve (102) and the air flow assembly (104) to open comprises: Start the air flow assembly (104) to reduce the pressure inside the gas collection pipeline (101); After a preset second time, acquire fourth collection information of the battery cell (20) in the battery pack that does not appear thermal runaway; If the fourth collection information is abnormal, open the breather valve (102) to sequentially discharge the gas in the battery pack through the breather valve (102) and the gas collection pipeline (101).

15. The pressure regulating method of claim 14, wherein, The battery monitoring circuit (300) comprises a battery cell monitoring module (301) and a temperature monitoring circuit (302); The acquisition of the second collection information of the battery monitoring circuit (300) at the battery cell (20) in the battery pack comprises: Respectively acquire first temperature information of the battery cell monitoring module (301) at the battery cell (20) and second temperature information of the temperature monitoring circuit (302) at the battery cell (20).

16. The pressure regulating method of claim 15, wherein, The temperature monitoring circuit (302) comprises a thermal sensitive switch; The acquisition of the fourth collection information of the battery cell (20) in the battery pack that does not appear thermal runaway comprises: Acquire on-off information of the thermal sensitive switch at the battery cell (20) in the battery pack that does not appear thermal runaway.

17. The pressure regulating method of any one of claims 12-16, wherein, The pressure regulating system (100) further comprises a control circuit (105), and the control circuit (105) comprises a first switch (1051); The control of the air flow assembly (104) to open comprises: Control the first switch (1051) to close to open the air flow assembly (104).

18. The pressure regulating method of claim 17, wherein, The pressure regulating system (100) further comprises a breather valve (102), and the control circuit (105) further comprises a second switch (1052), a third switch (1053) and a fourth switch (1054); The control of the first switch (1051) to close to open the air flow assembly (104) comprises: Control the second switch (1052) to be in an energized state; According to the energized second switch (1052), control the first switch (1051) and the third switch (1053) to close to open the air flow assembly (104); After the control of the first switch (1051) and the third switch (1053) to close to open the air flow assembly (104), further comprising: If the air flow assembly (104) is not opened, close the fourth switch (1054) to open the breather valve (102) and the air flow assembly (104).

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