Explosion-proof valve, power battery pack, thermal runaway protection method and system and vehicle

Abstract

The invention provides an anti-explosion valve of a power battery pack, the power battery pack for a vehicle, a thermal runaway protection method and system of the power battery pack and the vehicle. The anti-explosion valve comprises a shell and a valve deck attached to the shell, the shell comprises an exhaust channel arranged in a penetrating mode, the anti-explosion valve further comprises a valve element arranged in the shell, the valve element is configured to be capable of moving along the exhaust channel, the anti-explosion valve comprises at least one elastic piece arranged at the end of the valve element in the moving direction of the valve element, and the elastic piece is arranged in the shell. A displacement sensor is arranged in the anti-explosion valve and is configured to measure the displacement variation of the valve element along the exhaust channel. The explosion-proof valve of the power battery pack is improved, the displacement sensor is arranged in the explosion-proof valve, and the current pressure value in the power battery pack is obtained by measuring the displacement variation of the valve element of the explosion-proof valve, so that risk early warning can be provided when thermal runaway happens to the power battery pack; and the thermal runaway protection performance and the safety performance of the power battery pack are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicles, in particular to the field of power battery systems of new energy vehicles. More particularly, it relates to a power battery pack explosion-proof valve, a power battery pack for a vehicle using the same, a thermal runaway protection method of a power battery pack, a thermal runaway protection system of a power battery pack, and a vehicle using the same. BACKGROUND

[0002] In recent years, with the increasing demand for energy saving and environmental protection, new energy has been widely used in various fields, especially in the field of vehicles. Such vehicles mainly use power batteries as the main energy source, so the reliability and safety of the power battery have a direct impact on the performance and driving safety of the vehicle. When the power battery has internal faults due to overcharging, overdischarging, short circuit, high temperature, collision, etc. during operation, it may lead to uncontrolled chemical reactions inside the battery, generating a large amount of heat and causing thermal runaway. In this case, the temperature of the battery may quickly rise, even causing a fire or explosion.

[0003] At present, thermal runaway protection is achieved by setting an explosion-proof valve outside the box of the power battery pack. When abnormal pressure occurs inside the power battery pack, the explosion-proof valve will automatically open to release the pressure inside the pack, preventing the power battery pack from catching fire and exploding due to overpressure. However, the current explosion-proof valve can only mechanically exchange gas between the inside and outside of the power battery pack, lacking real-time monitoring and feedback mechanisms, and the driver cannot know the real-time pressure situation inside the power battery pack, which leads to a lack of timely risk warning in dangerous situations, increasing the risk of accidents. SUMMARY

[0004] The purpose of the present application is to solve the problems existing in the prior art, and to provide a power battery pack explosion-proof valve to improve the safety of the power battery pack in a cost-effective and reliable manner.

[0005] To this end, according to an aspect of the present application, a power battery pack explosion-proof valve is provided, which comprises a housing and a valve cover attached to the housing, the housing comprises a gas exhaust passage arranged therethrough, and the explosion-proof valve further comprises a valve core arranged in the housing, wherein the valve core is configured to be movable along the gas exhaust passage, the explosion-proof valve comprises at least one elastic member arranged at the end of the valve core in the moving direction of the valve core, and a displacement sensor is provided in the explosion-proof valve, which is configured to measure the displacement change of the valve core along the gas exhaust passage.

[0006] According to the above technical concept, the present application can further include any one or more of the following optional forms.

[0007] In some optional forms, the displacement sensor is arranged on a side of the valve cover facing the valve core or on the valve core, or is arranged on an inner side of the housing and adapted to a moving range of the valve core.

[0008] In some optional forms, the housing comprises a side wall substantially parallel to an extending direction of the exhaust passage, the side wall is provided with a plurality of air permeable holes, each of the air permeable holes is covered with a waterproof air permeable film, and the valve core is configured to block the air permeable holes when in the initial position.

[0009] According to another aspect of the present application, there is provided a power battery pack for a vehicle, comprising a box body and a battery module accommodated in the box body, wherein the power battery pack is provided with the explosion-proof valve as described above, an exhaust passage of the explosion-proof valve is matched with a pressure relief port of the box body, and the power battery pack comprises a battery management system, and a displacement sensor of the explosion-proof valve is connected to the battery management system.

[0010] In some optional forms, the at least one elastic member of the explosion-proof valve comprises a first elastic member and / or a second elastic member, wherein the first elastic member is arranged on an end of a valve core of the explosion-proof valve facing the box body, and / or the second elastic member is arranged on another end of the valve core of the explosion-proof valve away from the box body.

[0011] In some optional forms, the explosion-proof valve is provided with a connecting member comprising a wire harness and a plug connected to each other, wherein the wire harness is connected to the displacement sensor, and the plug is connected to the battery management system to connect the displacement sensor with the battery management system.

[0012] In some optional forms, the battery management system is configured to calculate a current pressure value of the power battery pack based on the displacement change amount of the valve core.

[0013] In some optional forms, the battery management system is configured to send the displacement change amount and / or the current pressure value to a user.

[0014] In some optional forms, the battery management system is configured to generate an alarm signal in response to the displacement change amount reaching an alarm change amount and / or in response to the current pressure value reaching an alarm pressure value.

[0015] In some optional forms, the battery management system is configured to cut off power of the power battery pack within a preset time in response to the displacement change amount reaching an alarm change amount and / or in response to the current pressure value reaching an alarm pressure value.

[0016] According to another aspect of the present invention, a thermal runaway protection method for a power battery pack is provided, wherein the power battery pack is provided with the aforementioned explosion-proof valve for the power battery pack, the thermal runaway protection method comprising: acquiring the displacement change of the valve core of the explosion-proof valve; calculating the current pressure value of the power battery pack based on the displacement change; and performing a thermal runaway protection action in response to the displacement change reaching an alarm change amount and / or in response to the current pressure value reaching an alarm pressure value.

[0017] In some alternative forms, the thermal runaway protection action includes: generating an alarm signal; and / or cutting off power to the battery pack within a preset time; and / or sending the displacement change and / or the current pressure value to the user.

[0018] According to another aspect of the present invention, a thermal runaway protection system for a power battery pack is provided, the power battery pack being provided with the aforementioned explosion-proof valve for the power battery pack, the thermal runaway protection system comprising: an acquisition module configured to acquire the displacement change of the valve core of the explosion-proof valve; a processing module configured to calculate the current pressure value of the power battery pack based on the displacement change; and an execution module configured to perform a thermal runaway protection action in response to the displacement change reaching an alarm change amount and / or in response to the current pressure value reaching an alarm pressure value.

[0019] In some alternative forms, the execution module is configured to: generate an alarm signal in response to the displacement change reaching an alarm change amount and / or in response to the current pressure value reaching an alarm pressure value; and / or cut off the power to the battery pack within a preset time in response to the displacement change reaching an alarm change amount and / or in response to the current pressure value reaching an alarm pressure value; and / or send the displacement change amount and / or the current pressure value to the user.

[0020] In some alternative forms, the acquisition module includes a displacement sensor of the explosion-proof valve, and / or the processing module includes a battery management system of the power battery pack, and / or the execution module includes a battery management system of the power battery pack.

[0021] According to another aspect of the present invention, a vehicle is provided, the vehicle including the above-described thermal runaway protection system for a power battery pack, wherein the thermal runaway protection system is communicatively connected to the vehicle's dashboard and / or infotainment system.

[0022] This invention improves the explosion-proof valve of the power battery pack by installing a displacement sensor inside the explosion-proof valve. By measuring the displacement change of the valve core, the current pressure value inside the power battery pack can be obtained, which can provide risk warning before thermal runaway occurs in the power battery pack, thereby improving the thermal runaway protection performance and safety performance of the power battery pack. Attached Figure Description

[0023] Other features and advantages of the invention will be better understood through the following detailed description of alternative embodiments in conjunction with the accompanying drawings, in which the same reference numerals identify the same or similar parts, wherein:

[0024] Figure 1 This is a schematic diagram of an explosion-proof valve for a power battery pack according to one embodiment of the present invention;

[0025] Figure 2 yes Figure 1 A cross-sectional schematic diagram of the explosion-proof valve of the power battery pack in the diagram;

[0026] Figure 3 yes Figure 2 A schematic diagram showing the explosion-proof valve of the power battery pack in normal condition;

[0027] Figure 4 yes Figure 2 The diagram shows the explosion-proof valve of the power battery pack in a breathing state, where the external pressure of the explosion-proof valve is greater than the internal pressure.

[0028] Figure 5 yes Figure 2 The diagram shows the explosion-proof valve of the power battery pack in another breathing state, where the external pressure of the explosion-proof valve is less than the internal pressure.

[0029] Figure 6 yes Figure 2 A schematic diagram showing the explosion-proof valve of the power battery pack in an alarm state;

[0030] Figure 7 yes Figure 2 A schematic diagram of the explosion-proof valve of the power battery pack in a state of thermal runaway;

[0031] Figure 8 This is a schematic flowchart of a thermal runaway protection method for a power battery pack according to an embodiment of the present invention; and

[0032] Figure 9 This is a schematic diagram of a thermal runaway protection system for a power battery pack according to an embodiment of the present invention. Detailed Implementation

[0033] The implementation and use of the embodiments are discussed in detail below. However, it should be understood that the specific embodiments discussed are merely illustrative of particular ways of implementing and using the invention, and are not intended to limit the scope of the invention. In the description, the structural positions of the various components, such as upper, lower, top, bottom, etc., are not absolute but relative. These directional descriptions are appropriate when the various components are arranged as shown in the figures, but they change accordingly when the positions of the various components in the figures change.

[0034] In this document, unless otherwise explicitly stated and limited, the terms "installation," "attachment," and "connection," etc., should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this document according to the specific circumstances.

[0035] Furthermore, the flowcharts and block diagrams in the accompanying drawings illustrate the possible architecture, functions, and operations of the methods and systems according to various embodiments of the present invention. It should be noted that the functions marked in the boxes may occur in a different order than that shown in the drawings. For example, two consecutively indicated boxes may actually be executed substantially in parallel, or they may sometimes be executed in reverse order, depending on the functions involved.

[0036] In this article, "vehicle" refers to a new energy vehicle that uses a power battery pack as its operating power and / or driving power, including but not limited to pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles.

[0037] The frequent fires and explosions in new energy vehicles are generally caused by thermal runaway within the power battery pack. Typically, power battery packs are protected against thermal runaway by installing explosion-proof valves. After thermal runaway occurs within the power battery pack, the explosion-proof valve quickly releases the high-temperature, high-pressure gases inside the power battery pack into the external environment, reducing the internal pressure and preventing fire and explosion. The inventors discovered that current explosion-proof valves are mechanical devices that can only facilitate physical gas exchange. Therefore, the pressure value inside the power battery pack cannot be fed back in real time, and users cannot obtain timely and effective feedback information about the pressure value inside the power battery pack. This prevents early risk warnings in dangerous situations and deprives users of valuable time to take effective protective measures, potentially leading to life-threatening situations.

[0038] A power battery pack according to one embodiment of the present invention includes a housing (not shown), the housing comprising an outer shell and a top cover attached to the outer shell, wherein a battery module (not shown) is housed within the outer shell and sealed by the top cover. Additionally, an explosion-proof valve 100 according to one embodiment of the present invention is attached to the outside of the battery pack housing. Figure 1 and Figure 2 As shown, the explosion-proof valve 100 includes a housing 110 and a valve cover 120 attached to the housing 110. The housing 110 is cylindrical and has an exhaust passage 112 extending through the housing 110 along the axial direction D1. The exhaust passage 112 cooperates with the pressure relief port of the battery pack housing to discharge gas inside the power battery pack. It is understood that the construction of the housing 110 varies depending on different needs and is not limited to that shown in the figure. Figure 2 As shown, the explosion-proof valve 100 also includes a valve core 130 disposed within the housing 110, and at least one elastic element 140, such as a spring, disposed at the end of the valve core 130 along the exhaust passage 112. The valve core 130 can reciprocate within the explosion-proof valve 100 along the exhaust passage 112 under the action of elastic force. Figure 2 As shown in the figure, in this embodiment, a first elastic element 141 is arranged at the top of the valve core 130, and a second elastic element 142 is arranged at the bottom of the valve core 130. It is understood that the number and distribution of the elastic elements 140 vary depending on different needs and are not limited to those shown in the figure.

[0039] exist Figure 1 In this embodiment, the explosion-proof valve 100 is provided with a mounting portion 180, which includes a through mounting hole 181 through which the explosion-proof valve 100 can be attached to the housing of the power battery pack. In one example, the explosion-proof valve 100 can be attached to the top of the housing, i.e., the top cover of the housing. In this case, the explosion-proof valve 100 includes at least one elastic element arranged on the housing-facing side of the valve core 130 of the explosion-proof valve 100. That is, the explosion-proof valve 100 is... Figure 2 When attached to the top of the enclosure as shown, the explosion-proof valve 100 includes at least a second elastic element 142 to provide elastic force to the valve core 130 and support the valve core 130. In another example, the explosion-proof valve 100 may be attached to the bottom of the enclosure, in which case the explosion-proof valve 100 includes at least one elastic element disposed on the side of the valve core 130 of the explosion-proof valve 100 opposite to the enclosure. That is, the explosion-proof valve 100 is... Figure 2 When attached to the bottom of the housing in the opposite orientation, the explosion-proof valve 100 includes at least a first elastic element 141 to provide elastic force to the valve core 130 and support the valve core 130.

[0040] Additionally, the housing 110 includes a sidewall generally parallel to the extending direction of the exhaust channel 112, the sidewall having a plurality of vent holes 111, each vent hole 111 being covered by a waterproof and breathable membrane 170. In some embodiments, the waterproof and breathable membrane 170 may be an EPTFE (polytetrafluoroethylene) breathable membrane. EPTFE breathable membranes have a microporous structure with pore sizes typically less than 10 micrometers, which can prevent most water molecules from entering the membrane, thus achieving a waterproof effect. Simultaneously, the microporous structure of the EPTFE breathable membrane allows air molecules to pass through, achieving a breathable function. By using an EPTFE breathable membrane, the explosion-proof valve 100 can achieve a waterproof performance of IP67 or IP68. Thus, the explosion-proof valve 100 can regulate the pressure inside and outside the power battery pack through the waterproof and breathable membrane 170 when the pressure inside the power battery pack does not reach the alarm pressure value, which will be described in detail below.

[0041] Reference Figure 2 The explosion-proof valve 100 also includes a displacement sensor 150, which measures the displacement change of the valve core 130 along the exhaust passage 112. In this way, the current pressure value of the power battery pack can be obtained by measuring the displacement change of the valve core 130 of the explosion-proof valve 100, enabling a risk warning before thermal runaway occurs in the power battery pack, thus improving the thermal runaway protection and safety performance of the power battery pack. In some embodiments, the displacement sensor 150 can be arranged on the side of the valve cover 120 facing the valve core 130, inside the housing 110, or on the valve core 130. Specifically, when the displacement sensor 150 is arranged inside the housing 110, it is adapted to the range of movement of the valve core 130 to measure the displacement change of the valve core 130. Advantageously, when the displacement sensor 150 is arranged on the side of the valve cover 120 facing the valve core 130, the unused space of the valve cover 120 can be used, thereby improving the space utilization rate within the explosion-proof valve 100.

[0042] like Figure 1As shown, the explosion-proof valve 100 also includes a connector 160. In this embodiment, the connector 160 is an electrical connector, comprising a wiring harness 162 and a plug 161 connected to each other. The wiring harness 162 of the connector 160 can be connected to the displacement sensor 150, and the plug 161 of the connector 160 can be connected to the battery management system (BMS, not shown) of the power battery pack, thereby establishing a connection between the displacement sensor 150 and the battery management system. In this way, the battery management system can obtain the displacement change from the displacement sensor 150 and calculate the current pressure value of the power battery pack using this displacement change. For example, the battery management system can obtain the spring force overcome by the valve core 130 through the displacement change of the valve core 130, and obtain the current pressure value of the power battery pack by combining this spring force with the volume of the battery pack housing. In addition, by calculating the current pressure value of the power battery pack through the battery management system, thermal runaway protection actions can be directly performed on the power battery pack when the current pressure value reaches the alarm pressure value, thereby improving the response speed of the power battery pack to thermal runaway and further improving the safety and reliability of the power battery pack and the vehicle.

[0043] In some implementations, when applied to vehicles, the battery management system can send displacement changes and / or current pressure values ​​to the user via the vehicle's dashboard and / or infotainment system. In this document, the user includes the driver and / or passengers. This allows the user to promptly and effectively receive information about the displacement changes of the explosion-proof valve spool and / or the current pressure value of the battery pack, and to evacuate the vehicle and call for assistance when the displacement change reaches an alarm level and / or the current pressure value reaches an alarm pressure level. This provides sufficient escape time before the battery pack experiences thermal runaway, ensuring personal and property safety.

[0044] In some implementations, the battery management system can generate an alarm signal and activate hazard warning lights in response to a displacement change reaching an alarm change threshold and / or a current pressure value reaching an alarm pressure value. When applied to vehicles, this can be achieved through hazard warning lights located on the vehicle's dashboard and / or infotainment system in response to the alarm signal; this is not limited to this specific implementation. Additionally, the battery management system can also cut off power to the battery pack within a preset time period in response to a displacement change reaching an alarm change threshold and / or a current pressure value reaching an alarm pressure value, effectively stopping the charging and discharging process of the battery pack. In some implementations, the preset time can be in the range of 10 to 30 seconds, for example, 20 seconds. It is understood that this preset time can be changed as needed and is not limited to this. This prevents further heat propagation from the battery pack and reduces internal damage to the battery pack caused by thermal runaway. Thus, thermal runaway protection for the battery pack is achieved through the above methods.

[0045] The following will refer to Figures 3 to 7This document details the various operating states of the explosion-proof valve 100.

[0046] exist Figure 3 In the illustrated scenario, the explosion-proof valve 100 is in normal operation. The internal pressure of the power battery pack is equal to the external pressure, i.e., the pressure difference ΔP = 0. The valve core 130 is in its initial position, blocking the vent 111, and the explosion-proof valve 100 does not exchange gases between the inside and outside of the power battery pack. At this time, the displacement change of the valve core 130 is 0. The displacement sensor 150 acquires the initial position of the valve core 130 and sends this initial position to the battery management system. For example, the displacement sensor 150 can acquire the distance d between the valve core 130 and the valve cover 120 and send this distance d to the battery management system.

[0047] exist Figure 4 and Figure 5 In the illustrated case, the explosion-proof valve 100 is in a breathing state. In this breathing state, the explosion-proof valve 100 can automatically adjust the internal and external pressures of the power battery pack through the waterproof and breathable membrane 170. Figure 4 In the middle, the internal pressure of the power battery pack is greater than the external pressure, that is, the pressure difference ΔP > 0, generating air pressure F1 from the inside out, and the valve core 130 is subjected to pressure along the... Figure 4 As shown, the gas moves upward under the influence of the upward air pressure F1, and the gas inside the power battery pack moves along... Figure 4 As shown, the pressure in direction D2 is released outward through the waterproof and breathable membrane 170 to balance the internal and external pressures of the power battery pack. At this time, the displacement sensor 150 acquires the displacement change Δd1 between the current position and the initial position of the valve core 130 and sends the displacement change Δd1 to the battery management system. The battery management system calculates the current pressure value inside the power battery pack based on the displacement change Δd1 and sends the displacement change Δd1 and / or the calculated current pressure value to the user, for example, through the vehicle's dashboard and / or infotainment system.

[0048] exist Figure 5 In the middle, the external pressure of the power battery pack is greater than the internal pressure, that is, the pressure difference ΔP < 0, generating air pressure F2 from the outside to the inside, and the valve core 130 is subjected to pressure along the inside. Figure 5 As shown, the gas moves downwards under the influence of the downward air pressure F2, and the gas outside the power battery pack moves along... Figure 5As shown, direction D3 enters the battery pack through the waterproof and breathable membrane 170 to balance the internal and external pressures of the battery pack. At this time, displacement sensor 150 acquires the displacement change Δd2 between the current position and the initial position of valve core 130 and sends this displacement change Δd2 to the battery management system. The battery management system calculates the current pressure value inside the battery pack based on the displacement change Δd2 and sends the displacement change Δd2 and / or the calculated current pressure value to the user, for example, through the vehicle's dashboard and / or infotainment system.

[0049] exist Figure 6 In the scenario shown, the explosion-proof valve 100 is in alarm mode. The internal pressure of the power battery pack is greater than the external pressure, meaning the pressure difference ΔP > 0, generating an outward air pressure F3. The valve core 130 is subjected to pressure along the... Figure 6 As shown, the gas moves upward under the influence of the upward air pressure F3, and the gas inside the power battery pack moves along... Figure 6 As shown, direction D2 is discharged outward through the waterproof and breathable membrane 170 to balance the internal and external pressures of the power battery pack. At this time, displacement sensor 150 acquires the alarm change Δd3 between the current position and the initial position of valve core 130 and sends this alarm change Δd3 to the battery management system. The battery management system will then perform the thermal runaway protection action described above based on this alarm change Δd3. In some embodiments, the alarm change Δd3 may be, for example, 25 mm, and the corresponding alarm pressure value may be, for example, 50 mbar ± 5 mbar. It is understood that the alarm change Δd3 and the corresponding alarm pressure value can be changed according to different requirements and the sealing capability of the battery pack, and are not limited thereto.

[0050] If in Figure 6 If the alarm status shown does not trigger thermal runaway protection, the following may occur: Figure 7 The situation is as shown. The power battery pack is in a state of thermal runaway, generating a large amount of heat, which causes the internal pressure of the power battery pack to increase. When the internal pressure of the power battery pack reaches the explosion-proof pressure, the explosion-proof valve 100 will automatically open, and the valve core 130, the first elastic element 141, and the valve cover 120 will move along the... Figure 7 As shown, it rushes upwards to quickly release the gas inside the battery pack. At this time, the gas will travel along... Figure 7 The D4 direction shown in the diagram releases power from within the battery pack. In some embodiments, the explosion-proof pressure value may be, for example, greater than 100 mbar. It is understood that the explosion-proof pressure value can be varied depending on different requirements and the sealing capability of the battery pack, and is not limited thereto.

[0051] In this way, the explosion-proof valve 100 according to the present invention obtains the current pressure value in the power battery pack by acquiring the displacement change of the valve core 130 through the displacement sensor 150, realizing real-time monitoring of the power battery pack pressure, and can perform thermal runaway protection action when the valve core 130 moves to the alarm position, that is, to take corresponding protective measures before the power battery pack experiences thermal runaway, reduce the damage caused by overheating of the power battery pack, extend the service life of the power battery pack, and improve the safety of the power battery pack and the vehicle.

[0052] Reference Figure 8 , Figure 8 A flowchart of a thermal runaway protection method for a power battery pack according to an embodiment of the present invention is shown.

[0053] A thermal runaway protection method for a power battery pack according to an embodiment of the present invention includes the following steps:

[0054] Step S101: Obtain the displacement change of the valve core of the explosion-proof valve.

[0055] Step S102: Calculate the current pressure value inside the power battery pack based on the displacement change.

[0056] Step S103: Execute thermal runaway protection action in response to the displacement change reaching the alarm change amount and / or in response to the current pressure value reaching the alarm pressure value.

[0057] Advantageously, thermal runaway protection actions may include: generating an alarm signal; and / or cutting off power to the battery pack within a preset time; and / or sending the displacement change and / or the current pressure value to the user.

[0058] The specific functions of the thermal runaway protection method for the power battery pack in this embodiment can be referred to the foregoing. Figures 1 to 7 The descriptions of the implementation methods will not be repeated here.

[0059] Reference Figure 9 , Figure 9 A thermal runaway protection system 200 for a power battery pack according to an embodiment of the present invention is shown. The thermal runaway protection system 200 includes: an acquisition module 210 configured to acquire the displacement change of the valve core of an explosion-proof valve; a processing module 220 configured to calculate the current pressure value of the power battery pack based on the displacement change; and an execution module 230 configured to perform thermal runaway protection actions in response to the displacement change reaching an alarm change amount and / or in response to the current pressure value reaching an alarm pressure value.

[0060] In some embodiments, the execution module 230 is configured to: generate an alarm signal in response to the displacement change reaching an alarm change amount and / or in response to the current pressure value reaching an alarm pressure value; and / or cut off the power to the battery pack within a preset time in response to the displacement change reaching an alarm change amount and / or in response to the current pressure value reaching an alarm pressure value; and / or send the displacement change amount and / or the current pressure value to the user.

[0061] In some embodiments, the acquisition module 210 includes a displacement sensor for the explosion-proof valve, and / or the processing module 220 includes a battery management system for the power battery pack, and / or the execution module 230 includes a battery management system for the power battery pack.

[0062] The specific functions of the thermal runaway protection system for the power battery pack in this embodiment can be referred to the foregoing. Figures 1 to 7 The descriptions of the implementation methods will not be repeated here.

[0063] The thermal runaway protection system 200 of the power battery pack of the present invention can be communicatively connected to the vehicle's dashboard and / or infotainment system when applied to a vehicle, so as to send the displacement change and / or current pressure value to the user through the dashboard and / or infotainment system.

[0064] It should be understood here that the embodiments shown in the figures only illustrate the optional shape, size and arrangement of the explosion-proof valve of the power battery pack according to the present invention. However, they are only illustrative and not limiting. Other shapes, sizes and arrangements may be adopted without departing from the spirit and scope of the present invention.

[0065] The technical content and features of the present invention have been disclosed above. However, it is understood that those skilled in the art can make various changes and improvements to the disclosed concepts under the inventive concept of the present invention, all of which fall within the protection scope of the present invention. The description of the above embodiments is illustrative rather than restrictive, and the protection scope of the present invention is determined by the claims.

Claims

1. An explosion-proof valve for a power battery pack, characterized in that, The explosion-proof valve (100) includes a housing (110) and a valve cover (120) attached to the housing (110). The housing (110) includes a through-vent passage (112), and the explosion-proof valve (100) also includes a valve core (130) disposed within the housing (110). The valve core (130) is configured to move along the exhaust passage (112), the explosion-proof valve (100) includes at least one elastic element (140) arranged at the end of the valve core (130) along the moving direction of the valve core (130), and the explosion-proof valve (100) is provided with a displacement sensor (150) configured to measure the displacement change of the valve core (130) along the exhaust passage (112).

2. The explosion-proof valve of the power battery pack according to claim 1, characterized in that, The displacement sensor (150) is arranged on the side of the valve cover (120) facing the valve core (130) or on the valve core (130), or arranged inside the housing (110) and adapted to the movement range of the valve core (130).

3. The explosion-proof valve of the power battery pack according to claim 1 or 2, characterized in that, The housing (110) includes a sidewall that extends substantially parallel to the direction of the exhaust passage (112), the sidewall having a plurality of vent holes (111), each of the vent holes (111) being covered with a waterproof and breathable membrane (170), wherein the valve core (130) is configured to block the vent holes (111) when in its initial position.

4. A power battery pack for a vehicle, characterized in that, The power battery pack includes a housing and a battery module housed within the housing. The housing is externally attached with an explosion-proof valve for the power battery pack according to any one of claims 1 to 3. The exhaust passage (112) of the explosion-proof valve (100) is engaged with the pressure relief port of the housing. The power battery pack includes a battery management system, and the displacement sensor (150) of the explosion-proof valve (100) is connected to the battery management system.

5. The power battery pack for a vehicle according to claim 4, characterized in that, At least one elastic element (140) of the explosion-proof valve (100) includes a first elastic element (141) and / or a second elastic element (142), wherein the first elastic element (141) is arranged on one end of the valve core (130) of the explosion-proof valve (100) facing the housing, and / or the second elastic element (142) is arranged on the other end of the valve core (130) of the explosion-proof valve (100) away from the housing.

6. The power battery pack for a vehicle according to claim 4, characterized in that, The explosion-proof valve (100) is provided with a connector (160), which includes a wire harness (162) and a plug (161) connected to each other. The wire harness (162) is connected to the displacement sensor (150), and the plug (161) is connected to the battery management system to connect the displacement sensor (150) to the battery management system.

7. The power battery pack for a vehicle according to any one of claims 4 to 6, characterized in that, The battery management system is configured to calculate the current pressure value of the power battery pack based on the displacement change of the valve core (130).

8. The power battery pack for a vehicle according to claim 7, characterized in that, The battery management system is configured to send the displacement change and / or the current pressure value to the user.

9. The power battery pack for a vehicle according to claim 7, characterized in that, The battery management system is configured to generate an alarm signal in response to the displacement change reaching an alarm change amount and / or in response to the current pressure value reaching an alarm pressure value.

10. The power battery pack for a vehicle according to claim 7, characterized in that, The battery management system is configured to cut off power to the battery pack within a preset time in response to the displacement change reaching an alarm change and / or in response to the current pressure value reaching an alarm pressure value.

11. A method for protecting a power battery pack from thermal runaway, characterized in that, The power battery pack is equipped with an explosion-proof valve according to any one of claims 1 to 3, and the thermal runaway protection method includes: Obtain the displacement change of the valve core of the explosion-proof valve (S101); The current pressure value of the power battery pack is calculated based on the displacement change (S102); In response to the displacement change reaching the alarm change amount and / or in response to the current pressure value reaching the alarm pressure value, thermal runaway protection action is performed (S103).

12. The thermal runaway protection method for a power battery pack according to claim 11, characterized in that, The thermal runaway protection actions include: generating an alarm signal; and / or cutting off the power to the battery pack within a preset time; and / or sending the displacement change and / or the current pressure value to the user.

13. A thermal runaway protection system for a power battery pack, characterized in that, The power battery pack is equipped with an explosion-proof valve according to any one of claims 1 to 3, and the thermal runaway protection system (200) includes: Acquisition module (210), the acquisition module (210) is configured to acquire the displacement change of the valve core of the explosion-proof valve; A processing module (220) configured to calculate the current pressure value of the power battery pack based on the displacement change; An execution module (230) is configured to perform thermal runaway protection actions in response to the displacement change reaching an alarm change and / or in response to the current pressure value reaching an alarm pressure value.

14. The thermal runaway protection system for a power battery pack according to claim 13, characterized in that, The execution module (230) is configured to: generate an alarm signal in response to the displacement change reaching an alarm change amount and / or in response to the current pressure value reaching an alarm pressure value; and / or cut off the power of the power battery pack within a preset time in response to the displacement change reaching an alarm change amount and / or in response to the current pressure value reaching an alarm pressure value; and / or send the displacement change amount and / or the current pressure value to the user.

15. The thermal runaway protection system for a power battery pack according to claim 13 or 14, characterized in that, The acquisition module (210) includes the displacement sensor of the explosion-proof valve, and / or the processing module (220) includes the battery management system of the power battery pack, and / or the execution module (230) includes the battery management system of the power battery pack.

16. A vehicle, characterized in that, The vehicle includes a thermal runaway protection system for a power battery pack according to any one of claims 13 to 15, wherein the thermal runaway protection system is communicatively connected to the vehicle's dashboard and / or infotainment system.

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