Pressure regulating system, thermal runaway management system and battery pack

Abstract

The embodiment of the utility model discloses a pressure regulating system, a thermal runaway management system and a battery pack. The pressure adjusting system comprises a gas collecting pipeline, a ventilation valve and a balance valve, the gas collecting pipeline is arranged outside the battery pack, one end of the ventilation valve is communicated with one end of the gas collecting pipeline, one end of the balance valve is communicated with the inside of the battery pack, and the other end of the balance valve is communicated with the outside of the battery pack; furthermore, after the battery cells in the battery pack are in thermal runaway, gas generated by thermal runaway can be discharged through the ventilation valve and the gas collection pipeline in sequence, no equipment for measuring the concentration of harmful gas needs to be additionally arranged in the battery pack, and meanwhile, the air pressure in the battery pack can be adjusted through the balance valve; and secondary damage caused by deformation of the battery pack is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a pressure regulating system, a thermal runaway management system and a battery pack. BACKGROUND

[0002] Thermal runaway refers to a phenomenon that under certain conditions (such as high temperature, overcharge, internal short circuit, etc.), the internal chemical reaction of the battery is out of control, a large amount of heat is generated, and a fire or explosion may be triggered. Specifically, a short circuit occurs inside the battery, causing the electrolyte to burn or explode, or the positive electrode material decomposes to produce oxygen at high temperature, further 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, which can all cause thermal runaway.

[0003] In the 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 blower is needed to exhaust the gas inside the battery pack to reduce the gas concentration. However, the above method not only requires the addition of a harmful gas concentration measuring device inside the battery pack to ensure the current concentration value, but also requires a high level of explosion protection for the measuring device. UTILITY MODEL CONTENT

[0004] To address the deficiencies of the prior art, the present application provides a pressure regulating system, a thermal runaway management system and a battery pack, which can eliminate the need for additional harmful gas concentration measuring devices inside the battery pack, quickly exhaust the gas generated by thermal runaway from the battery pack, and balance the pressure inside the battery pack through a balance valve to avoid secondary damage to the battery pack deformation.

[0005] To solve the above problems, in a first aspect, the present application provides a pressure regulating system, comprising:

[0006] A gas collection pipeline is provided outside the battery pack.

[0007] A gas permeable valve is provided, one end of which is in communication with one end of the gas collection pipeline, and the other end of which is in communication with the inside of the battery pack.

[0008] A balance valve is provided, one end of which is in communication with the inside of the battery pack, and the other end of which is in communication with the outside of the battery pack.

[0009] Further, in the pressure regulating system provided by the present application, the pressure regulating system further comprises a gas flow assembly configured to sequentially exhaust the gas inside the battery pack through the gas permeable valve and the gas collection pipeline.

[0010] Further, in the pressure regulating system provided in the application, the pressure regulating system further comprises a control circuit, the control circuit is electrically connected with the airflow assembly and is configured to control the airflow assembly to start and stop.

[0011] Further, in the pressure regulating system provided in the application, the pressure regulating system further comprises a first power supply;

[0012] The control circuit comprises:

[0013] A first switch, one end of the first switch is electrically connected with the positive electrode of the first power supply, and the other end of the first switch is electrically connected with the airflow assembly;

[0014] The negative electrode of the first power supply is electrically connected with the airflow assembly.

[0015] Further, in the pressure regulating system provided in the application, the pressure regulating system further comprises a second power supply;

[0016] The control circuit further comprises:

[0017] A second switch, one end of the second switch is electrically connected with the battery management system, and the other end of the second switch is respectively electrically connected with the negative electrode of the first power supply and the airflow assembly;

[0018] A third switch, one end of the third switch is respectively electrically connected with the battery management system and one end of the second switch, and the other end of the third switch is electrically connected with the positive electrode of the second power supply;

[0019] A fourth switch, one end of the fourth switch is electrically connected with one end of the third switch, and the other end of the fourth switch is electrically connected with the airflow assembly;

[0020] The negative electrode of the second power supply is electrically connected with the airflow assembly.

[0021] Further, in the pressure regulating system provided in the application, the fourth switch is configured to control the valve of the air permeable valve to open or close.

[0022] In a second aspect, the application further provides a thermal runaway management system, which comprises the pressure regulating system mentioned in the first aspect.

[0023] Further, in the thermal runaway management system provided in the application, the thermal runaway management system further comprises:

[0024] A battery monitoring circuit, which is arranged inside the battery pack and is electrically connected with the battery cells in the battery pack;

[0025] A fire-fighting assembly, which is arranged inside the battery pack and is electrically connected with the battery monitoring circuit;

[0026] The battery monitoring circuit is at least configured to monitor the temperature of the battery cells and control the fire-fighting assembly to perform fire extinguishing inside the battery pack, while controlling the pressure regulating system to collect the gas inside the battery pack.

[0027] Further, in the thermal runaway management system provided by the application, the battery monitoring circuit comprises:

[0028] a cell monitoring module electrically connected to the cell;

[0029] a temperature monitoring circuit electrically connected to the cell monitoring module and configured to monitor the temperature of the cell;

[0030] The cell monitoring module is configured to monitor the state of the battery and control the fire-fighting assembly to perform fire extinguishing inside the battery pack, and control the pressure regulating system to collect the gas inside the battery pack.

[0031] In a third aspect, the application also provides a battery pack comprising the thermal runaway management system provided in the second aspect.

[0032] The pressure regulating system provided by the application comprises a gas collection pipeline, an air permeable valve and a balance valve. The gas collection pipeline is arranged outside the battery pack. One end of the air permeable valve is in communication with one end of the gas collection pipeline, and the other end of the air permeable valve is in communication with the inside of the battery pack. One end of the balance valve is in communication with the inside of the battery pack, and the other end of the balance valve is in communication with the outside of the battery pack. Thus, after the cell in the battery pack is in thermal runaway, the gas generated by the thermal runaway can be sequentially discharged through the air permeable valve and the gas collection pipeline, and there is no need to additionally increase a harmful gas concentration measuring device inside the battery pack. At the same time, the balance valve can be used to regulate the air pressure inside the battery pack, so as to avoid secondary damage to the deformation of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0034] Figure 1 The first schematic block diagram of the pressure regulating system provided by the embodiments of the application;

[0035] Figure 2 The second schematic block diagram of the pressure regulating system provided by the embodiments of the application;

[0036] Figure 3 The third schematic block diagram of the pressure regulating system provided by the embodiments of the application;

[0037] Figure 4 The circuit diagram in which the air flow assembly provided by the embodiments of the application is located;

[0038] Figure 5A schematic block diagram of a thermal runaway management system provided by embodiments of the present application. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0040] It should be understood that, when used in the specification and the appended claims, the terms "comprise" and "include" indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not exclude one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0041] It should also be understood that the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and the appended claims of the present application, the singular forms "a", "an" and "the" are intended to include the plural forms, unless the context clearly indicates otherwise.

[0042] It should be further understood that the term "and / or" used in the specification and the appended claims of the present application means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0043] In addition, in the present application, unless otherwise explicitly specified or limited in the embodiments, the terms "mounting", "connection", "connection" and "fixing" and the like appearing in the embodiments should be understood broadly, for example, the connection can be a fixed connection, or a detachable connection, or integrated, which can be understood, or can be a mechanical connection, an electrical connection, etc. Of course, it can also be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements, or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific implementation situation.

[0044] Please refer to Figure 1 , Figure 1 A first schematic block diagram of a pressure regulation system provided by embodiments of the present application. As Figure 1 shown, the present application provides a pressure regulation system 100, which comprises:

[0045] A gas collection pipeline 101 is arranged outside the battery pack.

[0046] A breather valve 102, one end of the breather valve 102 is in communication with one end of the gas collection pipeline 101, the other end of the breather valve 102 is in communication with the inside of the battery pack;

[0047] A balance valve 103, one end of the balance valve 103 is in communication with the inside of the battery pack, the other end of the balance valve 103 is in communication with the outside of the battery pack.

[0048] 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, each inlet can be in communication with a breather valve 102, thereby ensuring that when a certain battery cell 20 in a certain battery pack of the energy storage system is in thermal runaway, the gas generated by the battery cell 20 in thermal runaway 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 process of the battery cell 20 in thermal runaway generating gas, thereby enabling the gas generated by the battery cell 20 in thermal runaway to be discharged in time from the battery pack and be 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.

[0049] Among them, the breather valve 102 is a device for balancing the pressure inside and outside the sealed equipment and preventing moisture, dust and other pollutants from entering, its main function is to maintain good air permeability while preventing the intrusion of water droplets, drizzle, fine impurities and chemicals.

[0050] The balance valve 103 is arranged on the box where the battery pack is located and is in communication with the inside of the battery pack. 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 inside 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 difference independent balance valve 103.

[0051] In addition, the balance valve 103 can also be opened during the process of the thermal runaway of the battery cell 20 in the battery pack and the discharge of the exhaust gas in the battery pack, so as to avoid secondary damage to the deformation of the battery pack and greatly improve the safety and reliability of the battery pack. It should be noted that the opening of the balance valve 103 can be selected according to actual application, which is not limited in the present application.

[0052] The pressure regulating system 100 provided in the application comprises a gas collection pipeline 101, a gas permeable valve 102 and a balance valve 103. The gas collection pipeline 101 is arranged outside the battery pack. One end of the gas permeable valve 102 is in communication with one end of the gas collection pipeline 101, and the other end of the gas permeable valve 102 is in communication with the inside of the battery pack. One end of the balance valve 103 is in communication with the inside of the battery pack, and the other end of the balance valve 103 is in communication 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 gas permeable valve 102 and the gas collection pipeline 101, and there is no need to additionally increase the measuring device of the harmful gas concentration in the battery pack. At the same time, the air pressure in the battery pack can be adjusted through the balance valve 103, so as to avoid the secondary damage of the deformation of the battery pack.

[0053] In some embodiments, as shown in Figure 2 The pressure regulating system 100 further comprises an air flow assembly 104, which is configured to sequentially discharge the gas in the battery pack through the gas permeable valve 102 and the gas collection pipeline 101.

[0054] In the embodiment, the air flow assembly 104 can be a fan. 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 started 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, so that the gas permeable valve 102 is opened, so that the exhaust gas generated by the thermal runaway can be sequentially discharged through the gas permeable 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 the human body.

[0055] In some embodiments, as shown in Figure 3 The pressure regulating system 100 further comprises a control circuit 105, which is electrically connected to the air flow assembly 104 and is configured to control the start and stop of the air flow assembly 104.

[0056] In the embodiment, the control circuit 105 is electrically connected to the battery cell monitoring module 301, the air flow assembly 104 and the backup power supply 106. The battery cell monitoring module 301 starts the air flow assembly 104 through the control circuit 105. At the same time, when the battery pack cannot provide power for the air flow assembly 104, the backup power supply 106 can supply power for the air flow assembly 104 through the control circuit 105, so as to ensure that the air flow assembly 104 can be started 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, so that the exhaust gas generated by the thermal runaway can be sequentially discharged through the gas permeable valve 102 and the gas collection pipeline 101.

[0057] In some embodiments, the pressure regulating system 100 further comprises a first power supply; as Figure 4As shown, the control circuit 105 includes a first switch 1051, one end of the first switch 1051 is electrically connected to the positive pole of the first power supply, and the other end of the first switch 1051 is electrically connected to the airflow assembly 104; the negative pole of the first power supply is electrically connected to the airflow assembly 104.

[0058] In this embodiment, the first power supply can be a power supply, which can be provided by a battery pack. When 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 to reduce the internal pressure of the gas collection pipeline 101, so that the exhaust gas generated by thermal runaway can be sequentially discharged by the air valve 102 and the gas collection pipeline 101, thereby preventing the exhaust gas from being directly discharged into the air, thereby reducing the harm to the environment and the human body.

[0059] Further, in some embodiments, the pressure regulating system 100 further includes a second power supply; as Figure 4 As shown, the control circuit 105 further 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 respectively electrically connected to the negative pole of the first power supply and the airflow assembly 104; one end of the third switch 1053 is respectively 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 pole 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 assembly 104; the negative pole of the second power supply is electrically connected to the airflow assembly 104.

[0060] In this embodiment, the second power supply can be a backup power supply 106, so that when the battery pack cannot provide power for the airflow assembly 104, the backup power supply 106 can provide power for the airflow assembly 104, ensuring that the airflow assembly 104 can continue to operate to reduce the internal pressure of the gas collection pipeline 101, so that the exhaust gas generated by thermal runaway can be sequentially discharged by the air valve 102 and the gas collection pipeline 101 to prevent the exhaust 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 battery 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 includes a relay, the relay includes a coil, and the relay is provided with at least four contacts, which are 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 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 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 pole of the second power supply.

[0064] When it is necessary to start the airflow assembly, the slave board of the battery management system sends a start 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 breather valve 102.

[0066] Specifically, the breather valve 102 mentioned in the present application can be controlled to close the fourth switch 1054 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 breather valve 102, thereby enabling the gas in the battery pack to be directed to be discharged through the breather valve 102.

[0067] In some embodiments, as shown in FIG. 1, the present application also provides a thermal runaway management system 10, which comprises the pressure regulating system 100 mentioned in the above embodiments. Figure 5

[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 spread of the thermal runaway in the battery pack and timely process the waste gas generated by the thermal runaway, effectively improving the safety and reliability of the battery pack.

[0069] In some embodiments, as shown in FIG. 1, the present application also provides a thermal runaway management system 10, which comprises the pressure regulating system 100 mentioned in the above embodiments. Figure 5

[0070] The battery monitoring circuit 300 is arranged in the interior of 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 interior of 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 interior of the battery pack and control the pressure regulating system 100 to collect the gas in the interior of the battery pack.

[0073] In the present 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 perform fire extinguishing in the interior of 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 rekindling, reducing the risk of secondary injury caused by the battery pack. The pressure regulating system 100 can collect the waste gas generated by the battery cell 20 and perform directional discharge, thereby preventing the waste gas from being directly discharged into the air, thereby reducing the harm to the environment and human body.

[0074] The thermal runaway management system 10 provided by the present application comprises the battery monitoring circuit 300, the fire-fighting assembly 200 and the pressure regulating system 100. The battery monitoring circuit 300 and the fire-fighting assembly 200 are arranged in the interior of 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 in the interior of the battery pack and control the gas collecting assembly to collect the gas in the interior of 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 spread of the thermal runaway in the battery pack can be timely controlled and the waste gas generated by the thermal runaway can be timely processed, effectively improving the safety and reliability of the battery pack.​​

[0075] In some embodiments, as shown in Figure 5 The battery monitoring circuit 300 comprises:

[0076] a cell monitoring module 301, which is electrically connected to the cell 20;

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

[0078] The 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, while controlling the pressure regulating system 100 to collect the gas inside the battery pack.

[0079] 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 monitored by the temperature monitoring circuit 302 on the cell 20 from the temperature monitoring circuit 302, and can further determine whether the cell 20 has experienced thermal runaway, thereby avoiding false positives of cell 20 thermal runaway and improving the accuracy of cell 20 thermal runaway monitoring.

[0080] In this embodiment, by simultaneously setting the cell monitoring module 301 and the temperature monitoring module in the battery pack, false positives of cell 20 thermal runaway can be avoided, and the accuracy of cell 20 thermal runaway monitoring can be improved. At the same time, the cell monitoring module 301 can be a slave module of the battery management system. As an important component of the battery management system, the slave module undertakes multiple key tasks such as data acquisition, equalization management, communication and thermal management, and is a key link to ensure the efficient and safe operation of the battery.

[0081] In some embodiments, the temperature monitoring circuit 302 comprises 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.

[0082] Specifically, a thermal switch is an electromechanical temperature control device that utilizes the different thermal expansion coefficients of the various layers of a bimetallic strip. When the temperature changes, the deformation of the active layer is greater than that of the passive layer, causing the bimetallic strip to bend toward the passive layer. This change in the curvature of the composite material creates a deformation characteristic that switches the current on and off. Thermal switches can change their on / off state based on changes in ambient temperature. They are classified into two types: positive and negative temperature coefficients. They are primarily 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.

[0083] When the temperature monitoring circuit 302 is used to monitor the temperature of the battery cells 20 in the battery pack, the present application can use a thermal switch to implement the monitoring. The thermal switch is low in cost and does not have the risk of communication anomalies, thereby reducing the misjudgment of thermal runaway of the battery cells 20 and improving the accuracy of thermal runaway monitoring of the battery cells 20. Each battery cell 20 in the battery pack is equipped with a thermal switch. When the battery cell 20 is operating 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 can determine that the battery cell 20 is in thermal runaway.

[0084] In some embodiments, as Figure 5 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.

[0085] 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 battery pack smoke detector 201 generally uses a photoelectric or ionization sensor to detect smoke and exhaust particles.

[0086] In this embodiment, a smoke detector 201 can be provided for each battery cell 20 in the battery pack. When a battery cell 20 in the battery pack experiences thermal runaway, the corresponding smoke detector 201 can detect the smoke generated by the thermal runaway battery cell 20 to determine whether thermal runaway has occurred in the battery cell 20. This can further reduce misjudgments of thermal runaway in the battery cell 20 and improve the accuracy of thermal runaway monitoring in the battery cell 20. Furthermore, after determining that a battery cell 20 has experienced thermal runaway, the fire extinguishing module 202 can be used to extinguish the fire to prevent the thermal runaway of the battery cell 20 from spreading and affecting other battery cells 20 in the battery pack that have not yet experienced thermal runaway, effectively improving the safety and reliability of the battery pack.

[0087] In some embodiments, as shown in Figure 5 The fire-fighting assembly 200 further comprises 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 inside the battery pack.

[0088] 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 thermal runaway. At the same time, after determining that the battery cell 20 has thermal runaway, the battery monitoring circuit 300 can control the fire extinguishing module 202 to perform fire extinguishing through the fire-fighting control module 203, so as 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 yet appeared thermal runaway from being affected, thereby effectively improving the safety and reliability of the battery pack.

[0089] In some embodiments, the application further provides a battery pack comprising the thermal runaway management system 10 mentioned in the above embodiments.

[0090] In this embodiment, the battery pack is provided with a battery management system (BMS), which can ensure the safe, reliable and efficient operation of the battery 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 such as voltage, current, temperature, etc. in real time. 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.

[0091] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art 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 covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A pressure regulating system, characterized in that: include: A gas collection pipe is provided outside the battery pack; a vent valve, one end of which is in communication with one end of the gas collection pipe, and the other end of which is in communication with the interior of the battery pack; A balancing 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 outside of the battery pack.

2. The pressure regulating system according to claim 1, characterized in that The pressure regulating system further includes an airflow component configured to discharge the gas inside the battery pack through the vent valve and the gas collection pipe in sequence.

3. The pressure regulating system according to claim 2, characterized in that: The pressure regulating system further includes a control circuit, which is electrically connected to the airflow component and configured to control the start and stop of the airflow component.

4. The pressure regulating system according to claim 3, characterized in that: The pressure regulation system further includes a first power source; The control circuit comprises: a first switch, wherein one end of the first switch is electrically connected to the positive electrode of the first power supply, and the other end of the first switch is electrically connected to the airflow assembly; The negative electrode of the first power supply is electrically connected to the airflow component.

5. The pressure regulating system according to claim 4, characterized in that: The pressure regulation system further includes a second power source; The control circuit further includes: a second switch, one end of the second switch being electrically connected to the battery management system, and the other end of the second switch being electrically connected to the negative electrode of the first power source and the airflow component; a third switch, one end of the third switch being electrically connected to the battery management system and one end of the second switch, and the other end of the third switch being electrically connected to the positive electrode of the second power supply; a fourth switch, wherein one end of the fourth switch is electrically connected to one end of the third switch, and the other end of the fourth switch is electrically connected to the airflow assembly; The negative electrode of the second power supply is electrically connected to the airflow component.

6. The pressure regulating system according to claim 5, characterized in that: The fourth switch is configured to control the opening or closing of the breathable valve.

7. A thermal runaway management system, characterized in that: A pressure regulating system comprising the pressure regulating system according to any one of claims 1 to 6.

8. The thermal runaway management system according to claim 7, characterized in that: The thermal runaway management system further comprises: a battery monitoring circuit, disposed inside the battery pack and electrically connected to the battery cells in the battery pack; a fire protection component, disposed inside the battery pack and electrically connected to the battery monitoring circuit; The battery monitoring circuit is at least configured to monitor the temperature of the battery cell, and control the fire-fighting component to extinguish the fire inside the battery pack, while controlling the pressure regulating system to collect the gas inside the battery pack.

9. The thermal runaway management system according to claim 8, characterized in that: The battery monitoring circuit includes: A battery cell monitoring module, electrically connected to the battery cell; a temperature monitoring circuit, electrically connected to the battery cell monitoring module and configured to monitor the temperature of the battery cell; The battery cell monitoring module is configured to monitor the status of the battery, control the fire-fighting component to extinguish the fire inside the battery pack, and control the pressure regulating system to collect gas inside the battery pack.

10. A battery pack, characterized in that: The thermal runaway management system comprises the thermal runaway management system according to any one of claims 7 to 9.

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