Pressure regulating method, pressure regulating system and thermal runaway management system

Abstract

The embodiment of the invention discloses a pressure regulation method, a pressure regulation system and a thermal runaway management system. According to the method, after thermal runaway of a battery cell in a battery pack, a harmful gas concentration measuring device does not need to be additionally arranged in the battery pack, an airflow assembly can be directly controlled to be started, so that gas generated by thermal runaway is rapidly discharged from the interior of the battery pack, and first collection information of a fire protection assembly in the battery pack is obtained after preset first time; if the first collection information is the preset first information, the balance valve is opened, after it is detected that the balance valve is opened, a closing instruction of the airflow assembly is generated, and the air pressure in the battery pack is adjusted through the balance valve, so that secondary damage to the battery pack due to deformation caused by too low air pressure is avoided, and the safety and reliability of the battery pack are greatly improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a pressure regulation method, a pressure regulation system and a thermal runaway management system. Background Art

[0002] Thermal runaway refers to the phenomenon that under certain conditions (such as high temperature, overcharging, internal short circuit, etc.), the chemical reaction inside the battery gets out of control, generating a lot 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 temperature to produce oxygen, further exacerbating heat accumulation, or the negative electrode material reacts violently with the electrolyte, causing the temperature to rise rapidly. In addition, excessive discharge of the battery will cause the internal pressure to decrease, all of which will cause thermal runaway.

[0003] In the related art, when the battery in the battery pack goes into thermal runaway, a large amount of toxic and flammable gas will be generated and discharged into the battery pack. The accumulation of gas in the battery pack may cause the risk of explosion. For this reason, an emergency fan is required to exhaust the inside of the battery pack to reduce the gas concentration. However, the above method not only requires adding a measuring device for the concentration of harmful gases inside the battery pack to ensure the current concentration value, but also has high explosion-proof requirements for the measuring equipment. Summary of the invention

[0004] In response to the deficiencies in the prior art, the present application provides a pressure regulation method, a pressure regulation system and a thermal runaway management system, which do not require additional measurement equipment for harmful gas concentrations inside the battery pack, and can also quickly discharge the gases generated by thermal runaway from the battery pack. The air pressure inside the battery pack can also be adjusted through a balancing valve to prevent the battery pack from being deformed and suffering secondary damage due to low air pressure.

[0005] To solve the above problems, in a first aspect, the present application provides a pressure regulation method, which is applied to a thermal runaway management system, the thermal runaway management system comprising a pressure regulation system and a fire protection component;

[0006] The pressure regulating system includes a balancing valve and an airflow component, one end of the airflow component is connected to the inside of the battery pack, the other end of the airflow component is connected to the outside of the battery pack, one end of the balancing valve is connected to the inside of the battery pack, and the other end of the balancing valve is connected to the outside of the battery pack; the pressure regulating method includes:

[0007] Control the opening of the airflow component;

[0008] After a preset first time, obtaining first collected information of the fire protection component in the battery pack;

[0009] If the first collected information is the preset first information, the balancing valve is opened;

[0010] If the balancing valve is detected to be open, a closing command for the airflow component is generated.

[0011] Furthermore, in the pressure regulation method provided in the present application, the pressure regulation system further includes a vent valve, one end of the vent valve is connected to the inside of the battery pack, and the other end of the vent valve is connected to the outside of the battery pack; the thermal runaway management system further includes a battery monitoring circuit;

[0012] Among them, controlling the airflow component to open includes:

[0013] Acquire second collected information of the battery monitoring circuit at the battery cell in the battery pack, and acquire third collected information of the fire protection component in the battery pack;

[0014] If at least one of the second collected information and the third collected information is abnormal, determining a thermal runaway area in the battery pack;

[0015] Control the fire fighting components to extinguish fire in the thermal runaway area, and control the ventilation valve and air flow components to open.

[0016] Furthermore, in the pressure regulation method provided in the present application, the pressure regulation system further includes a gas collection pipeline; the gas collection pipeline is arranged outside the battery pack, and one end of the gas collection pipeline is connected to the other end of the breathable valve;

[0017] Among them, controlling the opening of the vent valve and the airflow component includes:

[0018] Activate the gas flow assembly to reduce the pressure inside the gas collection pipe;

[0019] After the preset second time, fourth collected information of the battery cells in the battery pack that do not experience thermal runaway is obtained;

[0020] If the fourth collected information is abnormal, the ventilation valve is opened to discharge the gas in the battery pack through the ventilation valve and the gas collection pipe in sequence.

[0021] Furthermore, in the pressure regulation method provided in the present application, the battery monitoring circuit includes a battery cell monitoring module and a temperature monitoring circuit;

[0022] The step of obtaining the second collected information of the battery monitoring circuit at the battery cell in the battery pack includes:

[0023] The first temperature information of the battery cell monitoring module at the battery cell and the second temperature information of the temperature monitoring circuit at the battery cell are respectively obtained.

[0024] Furthermore, in the pressure regulation method provided in the present application, the temperature monitoring circuit includes a thermal switch;

[0025] The fourth collected information of the battery cells in the battery pack that do not have thermal runaway is obtained, including:

[0026] Obtain on / off information of thermal switches at cells in the battery pack that have not experienced thermal runaway.

[0027] Further, in the pressure regulation method provided in the present application, the pressure regulation system further includes a control circuit, and the control circuit includes a first switch;

[0028] Among them, controlling the airflow component to open includes:

[0029] The first switch is controlled to be closed to turn on the airflow component.

[0030] Furthermore, in the pressure regulation method provided in the present application, the pressure regulation system further includes a breathable valve, and the control circuit further includes a second switch, a third switch, and a fourth switch;

[0031] The step of controlling the first switch to close to start the airflow component includes:

[0032] Controlling the second switch to be in an energized state;

[0033] According to the second switch after power-on, controlling the first switch and the third switch to close, so as to turn on the airflow component;

[0034] After controlling the first switch and the third switch to close to turn on the airflow component, the method further includes:

[0035] If the airflow component is not turned on, close the fourth switch to turn on the air permeable valve and the airflow component.

[0036] In a second aspect, the present application also provides a pressure regulating system, which comprises:

[0037] An airflow component is disposed outside the battery pack and communicated with the interior of the battery pack;

[0038] A balancing valve, one end of the balancing valve is connected to the interior of the battery pack, and the other end of the balancing valve is connected to the outside of the battery pack.

[0039] Further, in the pressure regulating system provided in the present application, the pressure regulating system further comprises a breathable valve and a gas collecting pipeline;

[0040] Among them, one end of the air valve is connected to the interior of the battery pack, and the other end of the air valve is connected to one end of the gas collection pipe. The airflow component is arranged at the other end of the gas collection pipe, and the gas collection pipe is arranged outside the battery pack.

[0041] In a third aspect, the present application also provides a thermal runaway management system, which includes the pressure regulation system provided in the second aspect.

[0042] The pressure regulation method provided in the present application does not require additional measurement equipment for harmful gas concentration inside the battery pack after the battery cells in the battery pack thermally runaway, and can directly control the opening of the airflow component to quickly discharge the gas generated by the thermal runaway from the inside of the battery pack, and obtain the first collection information of the fire protection component in the battery pack after a preset first time; if the first collection information is the preset first information, the balancing valve is opened, and after detecting that the balancing valve is open, a closing instruction of the airflow component is generated, and the air pressure inside the battery pack is adjusted through the balancing valve to avoid secondary damage to the battery pack due to deformation due to low air pressure, thereby greatly improving the safety and reliability of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 A first schematic block diagram of a pressure regulation system provided in an embodiment of the present application;

[0045] Figure 2 A second schematic block diagram of a pressure regulation system provided in an embodiment of the present application;

[0046] Figure 3 A circuit diagram of an airflow component provided in an embodiment of the present application;

[0047] Figure 4 A schematic block diagram of a thermal runaway management system provided in an embodiment of the present application;

[0048] Figure 5 A schematic flow chart of the pressure regulation method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0050] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0051] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0052] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0053] In addition, in this application, unless otherwise clearly specified or limited in the embodiments, the terms "installed", "connected", "connected" and "fixed" etc. appearing in the embodiments should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integrated connection. It can be understood that it can also be a mechanical connection, an electrical connection, etc.; of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements, or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific implementation situation.

[0054] Embodiments of the present application provide a pressure regulation method, a pressure regulation system, and a thermal runaway management system.

[0055] To facilitate understanding, the pressure regulation system and the thermal runaway management system are first introduced, and then the pressure regulation method is introduced in detail based on the pressure regulation system and the thermal runaway management system.

[0056] See also Figure 1 , Figure 1 This is a first schematic block diagram of a pressure regulating system provided in an embodiment of the present application. Figure 1 As shown, the present application provides a pressure regulating system, which includes:

[0057] The airflow component 104 is disposed outside the battery pack and communicated with the interior of the battery pack;

[0058] The balancing valve 103 has one end connected to the inside of the battery pack and the other end connected to the outside of the battery pack.

[0059] In this embodiment, the airflow component 104 can control the fan, and the power required for the operation of the airflow component 104 can be provided by the battery pack. At the same time, the airflow component 104 can be turned on after the battery cell 20 in the battery pack has thermal runaway to reduce the internal air pressure of the gas collection pipeline 101, so that the exhaust gas generated by the thermal runaway can be discharged in a direction from the gas collection pipeline 101 and the breathable valve 102, thereby preventing the exhaust gas from being directly discharged into the air, thereby reducing the harm to the environment and human body.

[0060] Specifically, 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, and then the air pressure inside the battery pack can be adjusted to prevent the battery pack from deforming and suffering secondary damage. The balancing valve can be divided into three types: static balancing valve 103, dynamic balancing valve 103 and pressure difference independent balancing valve 103. It should be noted that the opening of the balancing valve 103 can be selected according to the actual application, and this application does not make specific restrictions.

[0061] In some embodiments, Figure 1 As shown, the pressure regulating system also includes a breathable valve and a gas collecting pipe; wherein, one end of the breathable valve is connected to the interior of the battery pack, and the other end of the breathable valve is connected to one end of the gas collecting pipe, the airflow component is arranged at the other end of the gas collecting pipe, and the gas collecting pipe is arranged outside the battery pack.

[0062] In this embodiment, the gas collection pipe 101 is arranged outside the battery pack. The gas collection pipe 101 can be provided with multiple gas collection inlets and connected to the breathable valve 102, so as to ensure that after a battery cell 20 in a battery pack of the energy storage system has a thermal runaway, the gas generated by the thermal runaway of the battery cell 20 can be discharged in time through the breathable valve 102 on the battery pack body. The breathable valve 102 can be opened in the process of the gas collection pipe 101 collecting the gas generated by the thermal runaway of the battery cell 20, so that the gas generated by the thermal runaway of the battery cell 20 can be discharged from the battery pack in time and discharged in a direction, which can prevent the exhaust gas from being directly discharged into the air, thereby reducing the harm to the environment and human body.

[0063] Among them, the air valve 102 is a device used to balance the internal and external pressures of the sealing device to prevent the entry of moisture, dust and other pollutants. Its main function is to maintain good air permeability while preventing the intrusion of water droplets, drizzle, fine impurities and chemicals.

[0064] The pressure regulating system 100 provided in the present application includes a gas collecting pipe 101, a breathable valve 102, a balancing valve 103 and an airflow component 104. The gas collecting pipe 101 is arranged on the outside of the battery pack, one end of the breathable valve 102 is connected to one end of the gas collecting pipe 101, and the other end of the breathable valve 102 is connected to the inside of the battery pack. The airflow component 104 is arranged at the other end of the gas collecting pipe 101, one end of the balancing valve 103 is connected to the inside of the battery pack, and the other end of the balancing valve 103 is connected to the outside of the battery pack. Therefore, after the battery cell 20 in the battery pack has a thermal runaway, the gas generated by the thermal runaway can be discharged in sequence through the breathable valve 102 and the gas collecting pipe 101, and there is no need to add additional harmful gas concentration measuring equipment inside the battery pack. At the same time, the air pressure inside the battery pack can be adjusted by the balancing valve 103 to avoid secondary damage caused by deformation of the battery pack.

[0065] In some embodiments, Figure 2 As shown, the pressure regulating system 100 further includes a control circuit 105 , which is electrically connected to the airflow component 104 and configured to control the start and stop of the airflow component 104 .

[0066] In this embodiment, the control circuit 105 is electrically connected to the battery cell monitoring module 301, the airflow component 104 and the backup power supply 106. The battery cell monitoring module 301 turns on the airflow component 104 through the control circuit 105. At the same time, when the battery pack cannot provide power to the airflow component 104, the backup power supply 106 can supply power to the airflow component 104 through the control circuit 105, ensuring that the airflow component 104 can be turned on after the battery cell 20 in the battery pack has thermal runaway, so as to reduce the internal air pressure of the gas collection pipeline 101, so that the exhaust gas generated by the thermal runaway can be discharged directionally from the gas collection pipeline 101 and the vent valve 102.

[0067] Further, in some embodiments, the pressure regulating system 100 further includes a first power source; Figure 3 As shown, 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, and the other end of the first switch 1051 is electrically connected to the airflow component 104 ; the negative electrode of the first power supply is electrically connected to the airflow component 104 .

[0068] In this embodiment, the first power source can be a power supply, which can be provided by a battery pack. When the battery cell 20 in the battery pack thermally runs away, the battery management system can control the first switch 1051 to close to start the airflow component 104 to reduce the internal air pressure of the gas collection pipe 101, so that the exhaust gas generated by the thermal runaway can be discharged in a direction through the air valve 102 and the gas collection pipe 101 in turn to prevent the exhaust gas from being directly discharged into the air, thereby reducing the harm to the environment and human body.

[0069] Furthermore, in some embodiments, the pressure regulating system 100 further includes a second power source; Figure 3 As shown, the control circuit 105 also includes 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, and the other end of the second switch 1052 is electrically connected to the negative electrode of the first power supply and the airflow component 104; one end of the third switch 1053 is electrically connected to the battery management system and one end of the second switch 1052, and the other end of the third switch 1053 is electrically connected to the positive electrode of the second power supply; one end of the fourth switch 1054 is electrically connected to one end of the third switch 1053, and the other end of the fourth switch 1054 is electrically connected to the airflow component 104; the negative electrode of the second power supply is electrically connected to the airflow component 104.

[0070] In this embodiment, the second power supply can be a backup power supply 106, and when the battery pack cannot provide power to the airflow component 104, the backup power supply 106 can provide power to the airflow component 104 to ensure that the airflow component 104 can continue to operate, so as to reduce the internal air pressure of the gas collection pipeline 101, so that the exhaust gas generated by thermal runaway can be directionally discharged in turn through the air valve 102 and the gas collection pipeline 101, so as to prevent the exhaust gas from being directly discharged into the air, thereby reducing the harm to the environment and human body.

[0071] 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 component 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 component 104, the negative pole V- of the power supply is electrically connected to the airflow component 104, one end of the second switch 1052 is electrically connected to the battery 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 component 104, one end of the third switch 1053 is electrically connected to the battery management system and one end of the second switch 1052, 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 component 104, and the negative pole of the backup power supply 106 is electrically connected to the airflow component 104.

[0072] In some embodiments, the control circuit 105 includes a relay, the relay includes 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 group 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 group of normally open contacts and can be understood as a third switch.

[0073] Specifically, one end of the coil is electrically connected to the slave control board of the battery management system, the other end of the coil is electrically connected to the negative pole of the first power supply, the first contact is electrically connected to the positive pole of the first power supply, the second contact is electrically connected to the airflow component, 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 pole of the second power supply.

[0074] When the airflow component needs to be started, the control board of the battery management system sends a start signal to the coil to make the coil conductive, so that the coil closes the first contact and the second contact, and the third contact and the fourth contact, so that the first power supply and the second power supply can simultaneously power the airflow component. When the first power supply and the second power supply power the airflow component at the same time, diodes are provided at the first power supply and the second power supply to prevent current backflow.

[0075] In some embodiments, the fourth switch 1054 is configured to control the opening or closing of the breathable valve 102 .

[0076] Specifically, the ventilation valve 102 mentioned in the present application can control the fourth switch 1054 to close through the slave control board of the battery management system where the battery pack is located after the battery cell 20 in the battery pack thermally runs away, so as to open the valve of the ventilation valve 102, thereby allowing the gas in the battery pack to be discharged in a direction through the ventilation valve 102.

[0077] In some embodiments, Figure 4 As shown, the present application also provides a thermal runaway management system 10, which includes the pressure regulating system 100 mentioned in the above embodiment.

[0078] The thermal runaway management system 10 provided in the present application can not only monitor the thermal runaway of the battery cell 20, but also timely control the spread of thermal runaway in the battery pack and promptly process the exhaust gas generated by the thermal runaway, thereby effectively improving the safety and reliability of the battery pack.

[0079] In some embodiments, Figure 4 As shown, the thermal runaway management system 10 further includes:

[0080] The battery monitoring circuit 300 is disposed inside the battery pack and electrically connected to the battery cells 20 in the battery pack;

[0081] The fire protection component 200 is disposed inside the battery pack and is electrically connected to the battery monitoring circuit 300;

[0082] The battery monitoring circuit 300 is at least configured to monitor the temperature of the battery cell 20, and control the fire fighting component 200 to perform fire extinguishing inside the battery pack, while controlling the pressure regulating system 100 to collect gas inside the battery pack.

[0083] In this 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 protection component 200 can directly extinguish the fire inside the battery pack when the battery cell 20 is in thermal runaway, and can quickly extinguish the battery cell 20 in the thermal runaway state and effectively prevent the battery pack from re-igniting, thereby reducing the risk of secondary damage to the battery pack. The pressure regulation system 100 can collect the exhaust gas generated by the battery cell 20 and discharge it in a directional manner to prevent the exhaust gas from being directly discharged into the air, thereby reducing harm to the environment and human body.

[0084] The thermal runaway management system 10 of the battery pack provided in the present application includes a battery monitoring circuit 300, a fire protection component 200 and a pressure regulating system 100. The battery monitoring circuit 300 and the fire protection component 200 are both arranged inside the battery pack. The battery monitoring circuit 300 is electrically connected to the battery cell 20 in the battery pack. The fire protection component 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 after detecting the thermal runaway of the battery cell 20, the fire protection component 200 can be controlled to perform fire extinguishing inside the battery pack and control the gas collection component to collect the gas inside the battery pack. This not only realizes the monitoring of the thermal runaway of the battery cell 20, but also can timely control the spread of the thermal runaway in the battery pack and timely treat the exhaust gas generated by the thermal runaway, effectively improving the safety and reliability of the battery pack.

[0085] In some embodiments, Figure 4 As shown, the battery monitoring circuit 300 includes:

[0086] A battery cell monitoring module 301, electrically connected to the battery cell 20;

[0087] The temperature monitoring circuit 302 is electrically connected to the battery cell monitoring module 301 and is configured to monitor the temperature of the battery cell 20;

[0088] The battery cell monitoring module 301 is configured to monitor the status of the battery, and control the fire fighting component 200 to perform fire extinguishing inside the battery pack, while controlling the pressure regulating system 100 to collect gas inside the battery pack.

[0089] Specifically, the cell monitoring module 301 can monitor the temperature, voltage and current of the cell 20 in the battery pack to ensure that the battery operates within a safe range, and the temperature monitoring circuit 302 can monitor the temperature of each cell 20 in the battery pack. In addition, the cell monitoring module 301 can obtain the temperature of the cell 20 monitored by the temperature monitoring circuit 302 from the temperature monitoring circuit 302, and can further determine whether the cell 20 has thermal runaway, thereby avoiding misjudgment of thermal runaway of the cell 20 and improving the accuracy of thermal runaway monitoring of the cell 20.

[0090] In this embodiment, by simultaneously providing the cell monitoring module 301 and the temperature monitoring module in the battery pack, it is possible to avoid misjudgment of thermal runaway of the cell 20 and improve the accuracy of thermal runaway monitoring of the cell 20. At the same time, the cell monitoring module 301 can be a slave control 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 collection, balancing management, communication and thermal management, and is a key link to ensure efficient and safe operation of the battery.

[0091] In some embodiments, the temperature monitoring circuit 302 includes a thermal switch; wherein one end of the thermal switch is electrically connected to one end of the battery cell 20 , and the other end of the thermal switch is electrically connected to the battery cell monitoring module 301 .

[0092] Specifically, a thermal switch is an electromechanical temperature control device that uses the different thermal expansion coefficients of the various component layers of the bimetallic strip. When the temperature changes, the deformation of the active layer is greater than that of the passive layer, so that the bimetallic strip as a whole will bend toward the passive layer. The curvature of this composite material changes, thereby producing deformation characteristics to achieve current switching. Thermal switches can change the open / closed state according to changes in ambient temperature. They are divided into positive temperature coefficient and negative temperature coefficient. They are mainly used in safety and control systems to monitor temperature and control related devices. Thermal switches can be implemented using a variety of technologies, including bimetallic switches, thermal reed switches, mercury switches, rod and tube switches with different temperature coefficients, and pneumatic switches.

[0093] When the temperature monitoring circuit 302 is used in the present application to monitor the temperature of the battery cell 20 in the battery pack, a thermal switch can be used to implement the monitoring. The thermal switch has a low cost and does not have the risk of abnormal communication, thereby reducing the misjudgment of thermal runaway of the battery cell 20 and improving the accuracy of thermal runaway monitoring of the battery cell 20. Each battery cell 20 in the battery pack is equipped with a thermal switch. When the battery cell 20 operates normally, the thermal switch is in a closed state; when the battery cell 20 is in thermal runaway, the temperature rises, and the thermal switch is disconnected. At this time, the battery cell monitoring module 301 cannot receive the current signal or voltage information at the thermal switch, and thus it can be determined that the battery cell 20 is in thermal runaway.

[0094] In some embodiments, Figure 4 As shown, the fire protection component 200 includes a smoke detector 201 and a fire extinguishing module 202; wherein, the smoke detector 201 and the fire extinguishing module 202 are both 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.

[0095] Specifically, the smoke detector 201 is a device specifically used to monitor 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 ion sensor to detect smoke and exhaust particles.

[0096] In this embodiment, a smoke detector 201 may be provided corresponding to each battery cell 20 in the battery pack. When a battery cell 20 in the battery pack is in thermal runaway, the corresponding smoke detector 201 may detect the smoke generated by the thermal runaway of the battery cell 20 to determine whether the battery cell 20 has experienced thermal runaway, thereby further reducing the misjudgment of thermal runaway of the battery cell 20 and improving the accuracy of thermal runaway monitoring of the battery cell 20. At the same time, after determining that the battery cell 20 is in thermal runaway, the fire extinguishing module 202 may be used to extinguish the fire to prevent the thermal runaway of the battery cell 20 from spreading and to prevent other battery cells 20 in the battery pack that have not experienced thermal runaway from being affected, thereby effectively improving the safety and reliability of the battery pack.

[0097] In some embodiments, Figure 5 As shown, the fire protection component 200 also includes a fire protection control module 203; wherein the fire protection 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 protection control module 203 is configured to control the fire extinguishing module 202 to perform fire extinguishing inside the battery pack.

[0098] Specifically, the battery monitoring circuit 300 can obtain the smoke information detected by the smoke detector 201 at the corresponding battery cell 20 through the fire control module 203, and then determine whether thermal runaway has occurred in the battery cell 20. At the same time, after determining that the battery cell 20 is in thermal runaway, the battery monitoring circuit 300 can control the fire extinguishing module 202 to extinguish the fire through the fire 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 experienced thermal runaway from being affected, thereby effectively improving the safety and reliability of the battery pack.

[0099] In some embodiments, the present application also provides a battery pack, which includes the thermal runaway management system 10 mentioned in the above embodiments.

[0100] In this embodiment, the battery pack is provided with a battery management system (BMS), which can ensure that the battery operates safely, reliably and efficiently under a variety of charging and discharging and environmental conditions. The battery management system can extend the service life of the battery and improve its performance by real-time monitoring and management of battery status parameters 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.

[0101] It can be understood that the pressure regulation system, thermal runaway management system and battery pack provided in the above embodiments are only examples. The pressure regulation system, thermal runaway management system and battery pack described in the embodiments of this application are to more clearly illustrate the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. It is known to those skilled in the art that with the evolution of the system and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems. They are described in detail below.

[0102] It should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments. The pressure regulation method is described in detail below. At the same time, the pressure regulation method provided in this application can be executed by a pressure regulation system, a thermal runaway management system, or a battery management system of a battery pack.

[0103] See also Figure 5 , Figure 5 The following is a flow chart of the pressure regulation method provided in the embodiment of the present application. Figure 5 As shown, the pressure regulation method includes steps S110 to S140.

[0104] S110, control the airflow component to open;

[0105] S120, after a preset first time, obtaining first collected information of the fire protection component in the battery pack;

[0106] S130: if the first collected information is the preset first information, open the balancing valve;

[0107] S140: If it is detected that the balancing valve is open, a closing instruction for the airflow component is generated.

[0108] In this embodiment, after determining that the battery cells in the battery pack are in thermal runaway, the airflow component can be controlled to open to reduce the air pressure inside the gas collection pipe, so that the exhaust gas generated by the thermal runaway can be discharged in a direction to prevent the exhaust gas from being directly discharged into the air, thereby reducing harm to the environment and human body.

[0109] Furthermore, after the thermal runaway in the battery pack is processed, that is, after the first time, the first collected information of the fire protection component in the battery pack can be obtained, that is, the smoke information monitored by the smoke detector in the fire protection component 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 balancing valve can be opened to adjust the air pressure inside the battery pack to avoid deformation of the battery pack and secondary damage, and after detecting that the balancing valve is open, the airflow component is closed; if the thermal runaway in the battery pack is not controlled, the balancing valve can also be opened to adjust the air pressure inside the battery pack to avoid deformation of the battery pack and secondary damage, and at the same time, the airflow component needs to continue working, so that the gas generated by the thermal runaway of the battery cell can be discharged from the battery pack in time and discharged in a direction.

[0110] Among them, the opening of the balancing valve is preferably performed after the thermal runaway in the battery pack is controlled, thereby eliminating the need for additional measurement equipment for the concentration of harmful gases inside the battery pack, and also preventing the battery pack from deforming and suffering secondary damage.

[0111] Among them, the first information may be information that the smoke concentration in the battery pack is lower than a preset concentration, that is, when the first collected information in the battery pack is that the smoke concentration in the battery pack is lower than the preset concentration, the balancing valve may be opened to balance the air pressure inside and outside the battery pack to avoid secondary damage to the battery pack; at the same time, the first information may also be information that the air pressure in the battery pack is lower than the preset air pressure, that is, when the first collected information in the battery pack is that the air pressure in the battery pack is lower than the preset air pressure, it can be determined that basically no gas is generated in the battery pack. At this time, the battery pack body has reached its limit, and the body is about to be deformed, so it is necessary to open the balancing valve to balance the air pressure inside and outside the battery pack to avoid secondary damage to the battery pack.

[0112] In some embodiments, the pressure regulating system also includes a breathable valve, one end of the breathable valve is connected to the interior of the battery pack, and the other end of the breathable valve is connected to the outside of the battery pack; the thermal runaway management system also includes a battery monitoring circuit; wherein step S110 includes: obtaining second collection information of the battery monitoring circuit at the battery cell in the battery pack, and third collection information of the fire protection component in the battery pack; if at least one of the second collection information and the third collection information is abnormal, determining the thermal runaway area in the battery pack; controlling the fire protection component to perform fire extinguishing in the thermal runaway area, and controlling the breathable valve and the airflow component to open.

[0113] In this embodiment, the second collected information includes the voltage, current, temperature and other information collected by the battery cell monitoring module at the battery cell in the battery pack, and the third collected information includes the smoke concentration collected by the fire protection component inside the battery pack. When the battery cell in the battery pack is in thermal runaway, the second collected information and the third collected information can be obtained, and it can be determined whether the temperature in the second collected information and the smoke concentration in the third collected information are abnormal, that is, whether at least one of the battery cell temperature, current, voltage, and smoke concentration in the battery pack is abnormal. If abnormal, it can be determined that the battery cell in the battery pack is in thermal runaway.

[0114] At the same time, the second collected information and the third collected information both include the location information of the battery cells. After determining that the battery cells are in thermal runaway, the thermal runaway area can be further determined through the location information of the battery cells in the second collected information and the third collected information, and thermal runaway treatment can be performed, such as fire extinguishing treatment, to prevent the thermal runaway of the battery cells from spreading to other battery cells, thereby effectively improving the safety and reliability of the battery pack.

[0115] In addition, while controlling the fire-fighting component to extinguish the fire in the thermal runaway area, it is also necessary to control the opening of the vent valve and the airflow component to control the gas collection component to collect the gas inside the battery pack. This can not only timely control the spread of thermal runaway in the battery pack, but also can promptly process the exhaust gas generated by thermal runaway after the battery cell triggers thermal runaway, effectively improving the safety and reliability of the battery pack.

[0116] In some embodiments, the temperature monitoring circuit includes multiple thermal switches, each battery cell corresponds to a thermal switch, the battery pack is provided with a ventilation valve, and the gas collection component includes an airflow component and a gas collection pipe; the ventilation valve and the airflow component are controlled to open, including: starting the airflow component to reduce the pressure inside the gas collection pipe; after a preset second time, obtaining fourth collection information of the battery cells in the battery pack that have not experienced thermal runaway; if the fourth collection information is abnormal, opening the ventilation valve to discharge the gas in the battery pack through the ventilation valve and the gas collection pipe in sequence.

[0117] In this embodiment, the gas collection pipe is arranged outside the battery pack, one end of the air valve is connected to one end of the gas collection pipe, the airflow component is arranged at the other end of the gas collection pipe, and the other end of the air valve is connected to the inside of the battery pack.

[0118] In the process of controlling the gas collection component to collect the gas inside the battery pack, the airflow component can be started first to reduce the pressure inside the gas collection pipe. Due to thermal runaway of the battery cells in the battery pack, the pressure inside the battery pack is relatively high. Therefore, a large pressure difference can be formed on both sides of the air valve, making it easier to open the air valve to quickly discharge the harmful gases generated in the battery pack.

[0119] At the same time, since thermal runaway may spread in the battery pack, and when thermal runaway spreads in the battery pack, the vent valve may still be in an unopened state, it is also necessary to confirm whether the battery cells that have not experienced thermal runaway in the battery pack have experienced thermal runaway after a preset first time. The battery cell monitoring module may not be able to monitor the status of other battery cells that have not experienced thermal runaway. For this reason, the present application preferably determines whether the battery cells that have not experienced thermal runaway have experienced thermal runaway through the on-off information of the thermistor at the battery cells that have not experienced thermal runaway, and then determines whether the thermal runaway has spread to other battery cells. If the thermistor at the battery cell that has not experienced thermal runaway is disconnected, it can be determined that the thermal runaway has spread to other battery cells. At this time, the vent valve needs to be opened immediately so that the gas in the battery pack can be quickly and timely discharged from the vent valve and the gas collection pipe in sequence.

[0120] In some embodiments, the battery monitoring circuit includes a battery cell monitoring module and a temperature monitoring circuit; wherein, obtaining the second collected information of the battery monitoring circuit at the battery cell in the battery pack includes: respectively obtaining the first temperature information of the battery cell monitoring module at the battery cell and the second temperature information of the temperature monitoring circuit at the battery cell.

[0121] In this embodiment, the second collected information includes the first temperature information and the second temperature information, and thus the present application can determine whether the battery cells in the battery pack are in thermal runaway through the first temperature information and the second temperature information, thereby reducing the probability of misjudgment of thermal runaway and improving the accuracy of thermal runaway judgment.

[0122] Specifically, if the first temperature information indicates that the temperature of the battery cell is higher than the preset temperature, it can be determined that the battery cell is likely to have 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, the battery 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 battery cell at the corresponding position has thermal runaway.

[0123] In some embodiments, if at least one of the second collected information and the third collected information is abnormal, determining the thermal runaway area in the battery pack includes: if at least one of the first temperature information, the second temperature information and the third collected information is abnormal, determining the thermal runaway area in the battery pack.

[0124] In this embodiment, determining the battery cell with thermal runaway in the battery pack specifically refers to determining the location information of the battery cell with thermal runaway in the battery pack. After detecting that at least one of the first temperature information, the second temperature information, and the third collected information is abnormal, the location information of the battery cell with thermal runaway in the battery pack can be determined through at least one of the first temperature information, the second temperature information, and the third collected information. For example, if the first temperature information is abnormal, the location information of the battery cell with thermal runaway in the battery pack can be determined through the circuit corresponding to the first temperature information, or the corresponding second temperature information can be determined through the circuit corresponding to the first temperature information, and the location information of the battery cell with thermal runaway in the battery pack can be determined through the circuit corresponding to the second temperature information.

[0125] In some embodiments, if at least one of the first temperature information, the second temperature information, and the third collected information is abnormal, a thermal runaway area within the battery pack is determined, including: if at least two of the first temperature information, the second temperature information, and the first collected information are abnormal, a thermal runaway area within the battery pack is determined.

[0126] Specifically, in order to ensure that there is no misjudgment of thermal runaway of the battery cell, the present application can determine whether the battery cell in the battery pack is in thermal runaway by determining whether at least two of the first temperature information, the second temperature information, and the third collected information are abnormal, and then determine the thermal runaway area, and perform thermal runaway treatment, such as fire extinguishing treatment, 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. 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 in thermal runaway; or if the first temperature information and the third collected information are abnormal, it can be determined that the battery cell in the battery pack is in thermal runaway; or if the second temperature information and the third collected information are abnormal, it can be determined that the battery cell in the battery pack is in thermal runaway; or if the first temperature information, the second temperature information, and the third collected information are abnormal, it can be determined that the battery cell in the battery pack is in thermal runaway; or if the first temperature information, the second temperature information, and the third collected information are abnormal, it can be determined that the battery cell in the battery pack is in thermal runaway.

[0127] In some embodiments, the temperature monitoring circuit includes a thermistor; before determining the thermal runaway area in the battery pack, it also includes: if the first temperature information is that the temperature of the battery cell is higher than a preset temperature, determining that the battery cell is in thermal runaway; if the second temperature information is the disconnection information of the thermistor, determining that the battery cell at the thermistor is in thermal runaway; if the third collected information is the preset second information, determining the battery cell in thermal runaway in the battery pack.

[0128] In this embodiment, the temperature monitoring circuit includes multiple thermistors, and each battery cell corresponds to a thermistor. The first temperature information is the temperature information monitored by the battery cell monitoring module at the battery cell. If the temperature 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 thermally runaway; the second temperature information is the on-off information of the thermistor in the temperature monitoring circuit. If the on-off information shows that the thermistor is disconnected, it can be determined that the battery cell at the corresponding position is thermally runaway; the third collected information is the smoke information monitored by the smoke alarm in the fire protection component in the battery pack. If the smoke information shows that the smoke concentration in the battery pack is higher than the preset threshold, that is, the third collected information is the second information, then it can be determined that the battery cell in the battery pack is thermally runaway.

[0129] In some embodiments, the temperature monitoring circuit includes a thermal switch; before determining the thermal runaway area in the battery pack, it also includes: if the first temperature information is that the temperature of the battery cell is higher than a 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 thermally runaway.

[0130] The present application can determine thermal runaway of the battery cell in the battery pack by whether the first temperature information and the second temperature information are abnormal. Specifically, if the first temperature information indicates that the temperature of the battery cell is higher than the preset temperature, it can be determined that the battery cell is likely to be in 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, the battery 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 battery cell at the corresponding position is in thermal runaway.

[0131] In some embodiments, before determining the thermal runaway area in the battery pack, it also includes: if the first temperature information indicates that the temperature of the battery cell is higher than the preset temperature, determining whether the third collected information is the preset second information; if the third collected information is the preset second information, determining the battery cell in thermal runaway in the battery pack.

[0132] Specifically, the present application can also determine whether the thermal runaway of the battery cell in the battery pack is abnormal based on the first temperature information and the third collected information. Similarly, if the first temperature information indicates that the temperature of the battery cell is higher than the preset temperature, it can be determined that the battery cell is likely to be in thermal runaway. In order to avoid misjudgment, it can be further determined whether the battery cell is in thermal runaway based on the first collected information of the fire protection component in the battery pack. Specifically, it can be determined whether the third collected information is the preset second information. If the third collected information is the second information, it can be determined that the battery cell is in thermal runaway.

[0133] In some embodiments, the temperature monitoring circuit includes a thermistor; before determining the thermal runaway area in the battery pack, it also includes: if the second temperature information is the disconnection information of the thermistor, determining whether the third collected information is the preset second information; if the third collected information is the preset second information, determining the battery cell in thermal runaway in the battery pack.

[0134] Specifically, the present application can also determine whether the thermal runaway of the battery cell in the battery pack is abnormal based on the second temperature information and the third collected information. If the second temperature information is the disconnection information of the thermal switch, it can be determined that the battery cell is likely to be in thermal runaway. In order to avoid misjudgment, it can be further determined whether the battery cell is in thermal runaway through the third collected information of the fire protection component in the battery pack. Specifically, it can be determined whether the third collected information is the preset second information. If the third collected information is the second information, it can be determined that the battery cell is in thermal runaway.

[0135] It should be noted that after obtaining the first temperature information, the second temperature information and the third collection information, the present application can first use any one of them to determine whether thermal runaway occurs in the battery cell. At the same time, in order to further improve the accuracy of thermal runaway, on this basis, the other two or one can be further used for further confirmation.

[0136] In some embodiments, determining a thermal runaway region within a battery pack includes: obtaining location information of a battery cell; and determining the thermal runaway region within the battery pack based on the location information.

[0137] In this embodiment, after determining that a battery cell in thermal runaway has occurred in the battery pack, the thermal runaway area in the battery pack can be directly determined based on the location information of the battery cell, and then the fire-fighting components in the corresponding area 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.

[0138] In some embodiments, determining a thermal runaway area in a battery pack includes: if the first collected information is first information, determining location information of a smoke detector corresponding to the first information; and determining a battery cell in thermal runaway in the battery pack according to the location information.

[0139] In this embodiment, the fire protection component includes multiple 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 the preset threshold, that is, the third collected information is the second information, it can be determined that there is a battery cell with thermal runaway in the battery pack. In order to determine the position of the thermal runaway battery cell in the battery pack, the position information of the smoke detector that generates a smoke alarm in the battery pack can be obtained, and then the position of the battery cell with thermal runaway in the battery pack can be determined according to the position information of the smoke detector. Therefore, the fire extinguishing module can be used to extinguish the battery cell with 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.

[0140] Furthermore, in some embodiments, determining a battery cell experiencing thermal runaway in a battery pack based on position information includes: acquiring first temperature information and / or second temperature information at a position corresponding to the smoke detector, and determining a battery cell experiencing thermal runaway in the battery pack based on the first temperature information and / or the second temperature information.

[0141] Specifically, the present application can further determine the battery cell in thermal runaway through the first temperature information and / or the second temperature information at the corresponding position of the smoke detector after the smoke detector alarms, so as to avoid misjudgment of thermal runaway, thereby improving the accuracy of determining thermal runaway of the battery cell.

[0142] In some embodiments, the temperature monitoring circuit includes a thermistor; wherein, obtaining the fourth collected information of the battery cell in the battery pack that has not experienced thermal runaway includes: obtaining the on-off information of the thermistor at the battery cell in the battery pack that has not experienced thermal runaway.

[0143] In this embodiment, the fourth collected information is the on-off information of the thermal switch at the battery cell that has not experienced thermal runaway. Since it is determined that there is a battery cell with thermal runaway in the battery pack, the battery cell monitoring module may not be able to monitor the status of other battery cells that have not experienced thermal runaway at this time. For this reason, the present application preferably determines whether the battery cell that has not experienced thermal runaway has experienced thermal runaway through the on-off information of the thermal switch at the battery cell that has not experienced thermal runaway, and then determines whether the thermal runaway has spread to other battery cells. If the thermal switch at the battery cell that has not experienced thermal runaway is disconnected, it can be determined that the thermal runaway has spread to other battery cells. At this time, it is necessary to control the gas collection component to collect the gas inside the battery pack and discharge it in a direction. At the same time, it is necessary to continue to extinguish the fire of all battery cells that have experienced thermal runaway until the thermal runaway of the battery cells is controlled.

[0144] In some embodiments, if the on-off information is the disconnection information of the thermal switch, it is determined that the battery cells in the battery pack that have not experienced thermal runaway are triggered into thermal runaway. At this time, the airflow assembly and the air valve need to be opened to carry out directionally discharge of the gas inside the battery pack. At the same time, it is also necessary to continue to extinguish the fire of all battery cells that have experienced thermal runaway until the thermal runaway of the battery cells is controlled.

[0145] Specifically, if the on-off information of the thermal switch is the closing information of the thermal switch, it can be determined that thermal runaway has not spread, and the gas inside the battery pack can be collected by controlling the gas collection component and discharged in a direction to prevent the exhaust gas from being directly discharged into the air, thereby reducing harm to the environment and human body; if the on-off information of the thermal switch is the opening and closing information of the thermal switch, it can be determined that the thermal runaway has spread to other battery cells. At this time, it is necessary to control the gas collection component to collect the gas inside the battery pack and discharge it in a direction. At the same time, it is necessary to continue to extinguish the fire of all battery cells with thermal runaway until the thermal runaway of the battery cells is controlled.

[0146] In some embodiments, the pressure regulating system further includes a control circuit, the control circuit includes a first switch; controlling the airflow component to open includes: controlling the first switch to close to open the airflow component.

[0147] Specifically, the present application preferably selects a battery pack to provide power for the airflow component, that is, the battery pack can be used to power the airflow component by controlling the first switch to be closed, thereby turning on the airflow component, so that the gas generated by thermal runaway inside the battery pack can be discharged in a direction.

[0148] In some embodiments, the pressure regulating system also includes a breathable valve, and the control circuit also includes a second switch, a third switch and a fourth switch; wherein, controlling the first switch to close to turn on the airflow component includes: controlling the second switch to be in a powered-on state; and according to the powered-on second switch, controlling the first switch and the third switch to close to turn on the airflow component.

[0149] In this embodiment, the pressure regulating system is also provided with a second power supply, i.e., a backup power supply, and the control circuit includes a relay and a fourth switch. The coil of the relay can be used as the second switch, and the relay is provided with at least two groups of normally open contacts, one group of normally open contacts is used as the first switch, and the other group of normally open contacts can be used 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 provided between the positive electrode of the second power supply and the airflow component, the fourth switch can be in an open state first, so that the battery pack supplies power to the airflow component.

[0150] After controlling the first switch and the third switch to close to open the airflow component, if the battery pack cannot supply power to the airflow component due to thermal runaway, the fourth switch can be closed to open the air valve and the airflow component.

[0151] It should be noted that the reason why the other group of normally open contacts of the relay can be used as the third switch in the present application is mainly to enable the second power supply to continuously energize the coil of the relay through the third switch after the third switch is closed. This not only enables the first power supply to power the airflow component through the first switch, but also enables the second power supply to continuously power the airflow component through the third switch, thereby ensuring that the airflow component will not be powered off when in the on state.

[0152] It can be understood that the present application can also directly control the fourth switch to close while energizing the coil of the relay to control the first switch and the third switch to be turned on, so as to open the valve of the air valve in advance, thereby enabling the first power supply and the second power supply to power the airflow component at the same time.

[0153] The pressure regulation method provided in the present application does not require additional measurement equipment for harmful gas concentration inside the battery pack after the battery cells in the battery pack thermally runaway, and can directly control the opening of the airflow component to quickly discharge the gas generated by the thermal runaway from the inside of the battery pack, and obtain the first collection information of the fire protection component in the battery pack after a preset first time; if the first collection information is the preset first information, the balancing valve is opened, and after detecting that the balancing valve is open, a closing instruction of the airflow component is generated, and the air pressure inside the battery pack is adjusted through the balancing valve to avoid secondary damage to the battery pack due to deformation due to low air pressure, thereby greatly improving the safety and reliability of the battery pack.

[0154] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A pressure regulation method, characterized in that: Applied to a thermal runaway management system, the thermal runaway management system comprising a pressure regulating system and a fire protection component; The pressure regulating system includes a balancing valve and an airflow component, one end of the airflow component is connected to the interior of the battery pack, and the other end of the airflow component is connected to the exterior of the battery pack, one end of the balancing valve is connected to the interior of the battery pack, and the other end of the balancing valve is connected to the exterior of the battery pack; the method includes: Controlling the airflow component to open; After a preset first time, obtaining first collected information of the fire protection component in the battery pack; If the first collected information is the preset first information, opening the balancing valve; If it is detected that the balancing valve is open, a closing instruction for the airflow component is generated.

2. The pressure regulating method according to claim 1, characterized in that: The pressure regulating system further includes a vent valve, one end of which is in communication with the interior of the battery pack, and the other end of which is in communication with the exterior of the battery pack; the thermal runaway management system further includes a battery monitoring circuit; Wherein, controlling the airflow component to open includes: Acquire second collected information of the battery monitoring circuit at the battery cell in the battery pack, and acquire third collected information of the fire protection component in the battery pack; If at least one of the second collected information and the third collected information is abnormal, determining a thermal runaway area in the battery pack; The fire fighting component is controlled to execute fire extinguishing in the thermal runaway area, and the ventilation valve and the air flow component are controlled to open.

3. The pressure regulating method according to claim 2, characterized in that: The pressure regulating system further includes a gas collecting pipeline; the gas collecting pipeline is arranged outside the battery pack, and one end of the gas collecting pipeline is connected to the other end of the breathable valve; Wherein, controlling the ventilation valve and the airflow component to open includes: activating the gas flow assembly to reduce the pressure inside the gas collection pipeline; After a preset second time, obtaining fourth collected information of the battery cells in the battery pack that do not experience thermal runaway; If the fourth collected information is abnormal, the ventilation valve is opened to discharge the gas in the battery pack through the ventilation valve and the gas collection pipe in sequence.

4. The pressure regulating method according to claim 3, characterized in that: The battery monitoring circuit includes a battery cell monitoring module and a temperature monitoring circuit; The step of obtaining the second collected information of the battery monitoring circuit at the battery cell in the battery pack includes: The first temperature information of the battery cell monitoring module at the battery cell and the second temperature information of the temperature monitoring circuit at the battery cell are respectively obtained.

5. The pressure regulating method according to claim 4, characterized in that: The temperature monitoring circuit includes a thermal switch; The step of obtaining the fourth collected information of the battery cells in the battery pack that do not experience thermal runaway includes: The on-off information of the thermal switch at the battery cell in the battery pack where no thermal runaway occurs is obtained.

6. The pressure regulating method according to any one of claims 1 to 5, characterized in that: The pressure regulation system further includes a control circuit, wherein the control circuit includes a first switch; Wherein, controlling the airflow component to open includes: The first switch is controlled to be closed to turn on the airflow component.

7. The pressure regulating method according to claim 6, characterized in that: The pressure regulating system further includes a breathable valve, and the control circuit further includes a second switch, a third switch and a fourth switch; The step of controlling the first switch to close to start the airflow component includes: Controlling the second switch to be in a power-on state; According to the second switch being powered on, controlling the first switch and the third switch to close, so as to turn on the airflow component; After controlling the first switch and the third switch to close to turn on the airflow component, the method further includes: If the airflow component is not turned on, close the fourth switch to turn on the air valve and the airflow component.

8. A pressure regulating system, characterized in that: include: An airflow component is disposed outside the battery pack and communicated with the interior of the battery pack; A balancing valve, one end of which is connected to the interior of the battery pack, and the other end of which is connected to the outside of the battery pack.

9. The pressure regulating system according to claim 8, characterized in that: The pressure regulating system also includes a breathable valve and a gas collection pipeline; Among them, one end of the air valve is connected to the interior of the battery pack, and the other end of the air valve is connected to one end of the gas collection pipe. The airflow component is arranged at the other end of the gas collection pipe, and the gas collection pipe is arranged outside the battery pack.

10. A thermal runaway management system, characterized in that: A pressure regulating system comprising the pressure regulating system described in any one of claims 8-9.

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