Battery pack active venting method, device, and vehicle

Abstract

The application provides a battery pack active exhaust method, device and vehicle. The battery pack active exhaust method comprises the following steps: obtaining working condition information of a battery pack, wherein the working condition information comprises at least one of the following: pressure information in the battery pack, temperature information in the battery pack, and voltage information of the battery pack; determining whether the battery pack is in a thermal runaway state based on the working condition information; generating a thermal runaway control strategy set for controlling the opening of an explosion-proof valve to make the battery pack exhaust to the outside through the explosion-proof valve when it is determined that the battery pack is in the thermal runaway state according to the working condition information. When it is confirmed that the battery pack is in the thermal runaway state, the explosion-proof valve is opened to make the battery pack timely perform thermal runaway exhaust when the battery pack is in the thermal runaway state, and the problem that the spring-type explosion-proof valve is prone to be stuck when the battery pack is in the thermal runaway state is avoided.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more specifically, to a method, apparatus, and vehicle for active venting of a battery pack. Background Technology

[0002] When a power battery experiences thermal runaway, it will burn and generate a large amount of high-temperature gas. Traditional thermal runaway venting methods involve installing a spring-loaded explosion-proof valve on the battery pack. When the pressure inside the battery pack reaches a certain threshold, the explosion-proof valve opens to release gas to the outside. However, spring-loaded explosion-proof valves are prone to jamming during thermal runaway and cannot open. Furthermore, to prevent accidental opening, their opening pressure is generally greater than 4 kPa. When the pressure is low, they cannot release gas, affecting the safety of the battery pack. Summary of the Invention

[0003] The main objective of this invention is to provide a method, device, and vehicle for active venting of a battery pack, in order to solve the problem in the prior art where the explosion-proof valve of the battery pack becomes stuck due to thermal runaway, affecting the safety of the battery pack.

[0004] To achieve the above objectives, according to one aspect of the present invention, a method for active venting of a battery pack is provided. The method includes: acquiring operating condition information of the battery pack, wherein the operating condition information includes at least one of the following: pressure information within the battery pack, temperature information within the battery pack, and voltage information of the battery pack; determining whether the battery pack is in a thermal runaway state based on the operating condition information; and, if it is determined that the battery pack is in a thermal runaway state based on the operating condition information, generating a thermal runaway control strategy set, the thermal runaway control strategy set being used to control the opening of an explosion-proof valve to allow the battery pack to vent air to the outside through the explosion-proof valve.

[0005] Furthermore, determining whether the battery pack is in a thermal runaway state based on operating condition information includes: determining that the battery pack is in a thermal runaway state when the pressure information is greater than the preset pressure information, the temperature information is greater than the preset temperature information, and the voltage information is greater than the preset voltage information.

[0006] Furthermore, if the battery pack is determined to be in a thermal runaway state based on the operating condition information, a thermal runaway control strategy set is generated, including: determining whether the pressure sensor information is greater than the explosion-proof valve opening threshold; if the pressure sensor information is determined to be greater than the explosion-proof valve opening threshold, a first control strategy is generated in the thermal runaway control strategy set, and the first control strategy is used to send an ignition signal to the explosion-proof valve.

[0007] Furthermore, when it is determined that the battery pack is in a thermal runaway state based on the operating condition information, a thermal runaway control strategy set is generated, including: generating a second control strategy in the thermal runaway control strategy set based on the detonation signal. The second control strategy is used to control the detonation device to start, rupture the waterproof and breathable membrane of the explosion-proof valve, so that the battery pack can vent air to the outside through the explosion-proof valve.

[0008] Furthermore, determining whether the battery pack is in a thermal runaway state based on operating condition information includes: determining that the battery pack is in a normal state when the pressure sensor information is less than the preset pressure sensor information, the temperature information is less than the preset temperature information, and the voltage information is less than the preset voltage information.

[0009] Furthermore, if the pressure sensor information is less than the preset pressure sensor information, the temperature information is less than the preset temperature information, and the voltage information is less than the preset voltage information, it is determined that the battery pack is in a normal state. The process then includes: acquiring the battery pack's operating condition information, wherein the operating condition information includes at least one of the following: information inside the battery pack, temperature information inside the battery pack, and voltage information inside the battery pack; and determining whether the battery pack is in a thermal runaway state based on the operating condition information.

[0010] According to another aspect of the present invention, a battery pack active venting device is provided, comprising: an acquisition unit for acquiring operating condition information of the battery pack, wherein the operating condition information includes at least one of the following: pressure information inside the battery pack, temperature information inside the battery pack, and voltage information of the battery pack; a judgment unit for judging whether the battery pack is in a thermal runaway state based on the operating condition information; and a determination unit for generating a thermal runaway control strategy set when it is determined that the battery pack is in a thermal runaway state based on the operating condition information, wherein the thermal runaway control strategy set is used to control the opening of an explosion-proof valve so that the battery pack vents to the outside through the explosion-proof valve.

[0011] Furthermore, the explosion-proof valve includes: a bracket having a receiving cavity, with vent holes circumferentially provided on the inner wall of the bracket; a waterproof and breathable membrane located on one side of the inner wall of the bracket, covering the vent holes; an ignition device disposed within the receiving cavity, located inside the waterproof and breathable membrane; a sealing ring circumferentially disposed on the other side of the inner wall of the bracket, connected to the inner wall of the bracket; and a wire harness interface disposed on the inner wall of the bracket, for allowing wires to pass through.

[0012] Furthermore, the support is provided with a fixing ring, which is located on the inner ring of the inner wall of the support and is connected to the inner wall of the support. Multiple fixing parts are provided circumferentially inside the fixing ring, and the detonation device is located inside the fixing ring and is connected to the multiple fixing parts.

[0013] Furthermore, the diameter of the exhaust port Where S is the area of ​​the vent, Q is the maximum gas production rate during thermal runaway, S1 is the unit area of ​​the vent, Q1 is the vent rate per unit area when the pressure difference is ΔP, and D is the diameter of the vent. Where ΔP = P - P0, P is the maximum pressure that the battery pack structure can withstand, and P0 is the ambient pressure.

[0014] According to another aspect of the present invention, a computer-readable storage medium is provided, comprising: the computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform the above-described active venting method for a battery pack.

[0015] According to another aspect of the present invention, a vehicle is provided, the vehicle including a battery pack, the battery pack being vented by an active venting method, the active venting method being the aforementioned active venting method.

[0016] By applying the technical solution of this invention, it is determined whether the battery pack is in a thermal runaway state based on the pressure information, temperature information, and voltage information within the battery pack. When it is confirmed that the battery pack is in a thermal runaway state, the explosion-proof valve opens so that the battery pack can be vented in time during thermal runaway, while avoiding the problem that the spring-type explosion-proof valve is prone to jamming during thermal runaway. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A schematic diagram of a first embodiment of the active venting method for a battery pack according to the present invention is shown;

[0019] Figure 2 A schematic diagram of the structure of the active venting device for a battery pack according to the active venting method of the battery pack according to the present invention is shown;

[0020] Figure 3 A schematic diagram of the structure of a first embodiment of a battery pack according to the active venting method of the battery pack according to the present invention is shown;

[0021] Figure 4 A schematic diagram of a second embodiment of a battery pack according to the active venting method for a battery pack based on the present invention is shown.

[0022] Figure 5 A schematic diagram of the structure of the explosion-proof valve in the active venting method for a battery pack according to the present invention is shown;

[0023] Figure 6 A schematic diagram of the battery management system of the active venting method for the battery pack according to the present invention is shown.

[0024] The above figures include the following reference numerals:

[0025] 100. Upper housing assembly; 200. Lower housing assembly; 300. Battery pack; 400. Explosion-proof valve; 500. Pressure sensor; 600. Battery management system; 700. Pressure sensor wiring harness; 900. Explosion-proof valve wiring harness;

[0026] 401. Bracket; 402. Waterproof and breathable membrane; 403. Detonation device; 404. Wiring harness interface; 405. Vent hole; 406. Sealing ring. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0030] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0031] It's important to note that thermal runaway in a battery pack refers to the situation where, during use, various factors cause the battery to overheat, triggering a chain reaction that leads to serious accidents such as internal combustion or explosion. Thermal runaway primarily results from irreversible chemical reactions within the battery, releasing a large amount of heat and causing the battery temperature to rise. When the battery temperature exceeds a certain limit, the internal reaction rate increases dramatically, leading to even more heat release, creating a vicious cycle that ultimately results in thermal runaway. Thermal runaway can cause increased pressure within the battery pack, container rupture, electrolyte leakage, and even fire or explosion.

[0032] Combination Figures 1 to 2 As shown in the figure, according to a specific embodiment of the present invention, an active venting method for a battery pack is provided.

[0033] Specifically, such as Figure 1 As shown, the active venting method for the battery pack includes the following steps:

[0034] Step S11: Obtain the operating condition information of the battery pack, wherein the operating condition information includes at least one of the following: pressure information inside the battery pack, temperature information inside the battery pack, and voltage information of the battery pack;

[0035] Step S12: Determine whether the battery pack is in a thermal runaway state based on the operating condition information;

[0036] Step S13: If the battery pack is determined to be in a thermal runaway state based on the operating condition information, a thermal runaway control strategy set is generated. The thermal runaway control strategy set is used to control the opening of the explosion-proof valve so that the battery pack can vent gas to the outside through the explosion-proof valve.

[0037] Through the above steps, based on the pressure information, temperature information, and voltage information inside the battery pack, it is determined whether the battery pack is in a thermal runaway state. When it is confirmed that the battery pack is in a thermal runaway state, the explosion-proof valve opens so that the battery pack can be vented in time during thermal runaway, while avoiding the problem that the spring-loaded explosion-proof valve is prone to jamming during thermal runaway.

[0038] Optionally, determining whether the battery pack is in a thermal runaway state based on operating condition information includes: determining that the battery pack is in a thermal runaway state when the pressure information is greater than the preset pressure information, the temperature information is greater than the preset temperature information, and the voltage information is greater than the preset voltage information.

[0039] Optionally, if the battery pack is determined to be in a thermal runaway state based on the operating condition information, a thermal runaway control strategy set is generated, including: determining whether the pressure sensor information is greater than the explosion-proof valve opening threshold; if the pressure sensor information is determined to be greater than the explosion-proof valve opening threshold, a first control strategy is generated in the thermal runaway control strategy set, and the first control strategy is used to send an ignition signal to the explosion-proof valve.

[0040] If the pressure information from the pressure sensor is greater than the opening threshold of the explosion-proof valve, the BMS sends an ignition signal to the explosion-proof valve.

[0041] Optionally, if the battery pack is determined to be in a thermal runaway state based on the operating condition information, a thermal runaway control strategy set is generated, including: generating a second control strategy in the thermal runaway control strategy set based on the detonation signal. The second control strategy is used to control the detonation device to start, rupture the waterproof and breathable membrane of the explosion-proof valve, so that the battery pack can vent air to the outside through the explosion-proof valve.

[0042] Furthermore, determining whether the battery pack is in a thermal runaway state based on operating condition information includes: determining that the battery pack is in a normal state when the pressure sensor information is less than the preset pressure sensor information, the temperature information is less than the preset temperature information, and the voltage information is less than the preset voltage information.

[0043] Furthermore, if the pressure sensor information is less than the preset pressure sensor information, the temperature information is less than the preset temperature information, and the voltage information is less than the preset voltage information, it is determined that the battery pack is in a normal state. The process then includes: acquiring the battery pack's operating condition information, wherein the operating condition information includes at least one of the following: information inside the battery pack, temperature information inside the battery pack, and voltage information inside the battery pack; and determining whether the battery pack is in a thermal runaway state based on the operating condition information.

[0044] According to the above steps, when the battery is under normal conditions, the system returns to obtain the battery pack's operating condition information and determines whether the battery pack is in a thermal runaway state based on the obtained operating condition information.

[0045] like Figure 2 As shown, according to another aspect of the present invention, a battery pack active venting device is provided, comprising: an acquisition unit 21, configured to acquire operating condition information of the battery pack, wherein the operating condition information includes at least one of the following: pressure information inside the battery pack, temperature information inside the battery pack, and voltage information of the battery pack; a judgment unit 22, configured to determine whether the battery pack is in a thermal runaway state based on the operating condition information; and a determination unit 23, configured to generate a thermal runaway control strategy set if it is determined that the battery pack is in a thermal runaway state based on the operating condition information, the thermal runaway control strategy set being used to control the opening of an explosion-proof valve so that the battery pack vents gas to the outside through the explosion-proof valve. The battery pack active venting device employs the above-described battery pack active venting method.

[0046] The active venting method for battery packs includes the following steps:

[0047] Step S11: Obtain the operating condition information of the battery pack, wherein the operating condition information includes at least one of the following: pressure information inside the battery pack, temperature information inside the battery pack, and voltage information of the battery pack;

[0048] Step S12: Determine whether the battery pack is in a thermal runaway state based on the operating condition information;

[0049] Step S13: If the battery pack is determined to be in a thermal runaway state based on the operating condition information, a thermal runaway control strategy set is generated. The thermal runaway control strategy set is used to control the opening of the explosion-proof valve so that the battery pack can vent gas to the outside through the explosion-proof valve.

[0050] Through the above steps, based on the pressure information, temperature information, and voltage information inside the battery pack, it is determined whether the battery pack is in a thermal runaway state. When it is confirmed that the battery pack is in a thermal runaway state, the explosion-proof valve opens so that the battery pack can be vented in time during thermal runaway, while avoiding the problem that the spring-loaded explosion-proof valve is prone to jamming during thermal runaway.

[0051] Optionally, determining whether the battery pack is in a thermal runaway state based on operating condition information includes: determining that the battery pack is in a thermal runaway state when the pressure information is greater than the preset pressure information, the temperature information is greater than the preset temperature information, and the voltage information is greater than the preset voltage information.

[0052] Optionally, if the battery pack is determined to be in a thermal runaway state based on the operating condition information, a thermal runaway control strategy set is generated, including: determining whether the pressure sensor information is greater than the explosion-proof valve opening threshold; if the pressure sensor information is determined to be greater than the explosion-proof valve opening threshold, a first control strategy is generated in the thermal runaway control strategy set, and the first control strategy is used to send an ignition signal to the explosion-proof valve.

[0053] Optionally, if the battery pack is determined to be in a thermal runaway state based on the operating condition information, a thermal runaway control strategy set is generated, including: generating a second control strategy in the thermal runaway control strategy set based on the detonation signal. The second control strategy is used to control the detonation device to start, rupture the waterproof and breathable membrane of the explosion-proof valve, so that the battery pack can vent air to the outside through the explosion-proof valve.

[0054] Furthermore, determining whether the battery pack is in a thermal runaway state based on operating condition information includes: determining that the battery pack is in a normal state when the pressure sensor information is less than the preset pressure sensor information, the temperature information is less than the preset temperature information, and the voltage information is less than the preset voltage information.

[0055] Furthermore, if the pressure sensor information is less than the preset pressure sensor information, the temperature information is less than the preset temperature information, and the voltage information is less than the preset voltage information, it is determined that the battery pack is in a normal state. The process then includes: acquiring the battery pack's operating condition information, wherein the operating condition information includes at least one of the following: information inside the battery pack, temperature information inside the battery pack, and voltage information inside the battery pack; and determining whether the battery pack is in a thermal runaway state based on the operating condition information.

[0056] like Figure 5 As shown, the explosion-proof valve includes: a bracket 401, which has a receiving cavity, and an exhaust port 405 is provided circumferentially on the inner wall of the bracket 401; a waterproof and breathable membrane 402, which is located on one side of the inner wall of the bracket 401 and covers the exhaust port 405; an detonating device 403, which is disposed in the receiving cavity and located inside the waterproof and breathable membrane 402; a sealing ring 406, which is circumferentially disposed on the other side of the inner wall of the bracket 401 and connected to the inner wall of the bracket 401; and a wiring harness interface 404, which is disposed on the inner wall of the bracket 401 and is used for wires to pass through. Specifically, the exhaust port 405 is covered by the waterproof and breathable membrane 402 to achieve pressure balance inside and outside the battery pack in the absence of thermal runaway; the detonating device 403 contains TNT explosive. When the BMS sends a detonation signal to the intelligent explosion-proof valve, the TNT explosive inside the detonation device is detonated. The explosive blasts open the waterproof and breathable membrane 402, allowing the gas inside the battery pack to escape. Specifically, the waterproof and breathable membrane on the explosion-proof valve is a thin film material with waterproof and breathable properties, commonly made of polytetrafluoroethylene (PTFE) or polyester. Its function is to protect the valve body from external moisture erosion and allow internal moisture to escape through the vents, maintaining a dry interior. The waterproof and breathable membrane effectively prevents water accumulation or moisture inside the valve body, preventing moisture from entering and causing problems such as valve core corrosion and valve jamming. It also prevents prolonged retention of internal moisture, reducing corrosion and corrosion product accumulation caused by moisture, thus extending the valve's service life.

[0057] Furthermore, the bracket 401 is provided with a fixing ring, which is located on the inner ring of the inner wall of the bracket 401 and is connected to the inner wall of the bracket 401. Multiple fixing members are provided circumferentially inside the fixing ring, and the detonating device 403 is disposed inside the fixing ring and connected to the multiple fixing members. This arrangement improves the stability of the detonating device 403.

[0058] Furthermore, the diameter of the vent 405 Where S is the area of ​​the vent, Q is the maximum gas production rate during thermal runaway, S1 is the unit area of ​​the vent, Q1 is the vent rate per unit area when the pressure difference is ΔP, and D is the diameter of the vent. Where ΔP = P - P0, P is the maximum pressure that the battery pack structure can withstand, and P0 is the ambient pressure.

[0059] According to another aspect of the present invention, a computer-readable storage medium is provided, comprising: the computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform the above-described active battery pack venting method. The program or code segment may be stored in a machine-readable medium or transmitted over a transmission medium or communication link via a data signal carried in a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, intranet, etc.

[0060] According to another aspect of the present invention, a processor is provided for running a program, wherein the program executes the above-described active battery pack venting method during runtime. The active battery pack venting method includes: acquiring operating condition information of the battery pack, wherein the operating condition information includes at least one of the following: pressure information within the battery pack, temperature information within the battery pack, and voltage information of the battery pack; determining whether the battery pack is in a thermal runaway state based on the operating condition information; and, if it is determined that the battery pack is in a thermal runaway state based on the operating condition information, generating a thermal runaway control strategy set, the thermal runaway control strategy set being used to control the opening of an explosion-proof valve to allow the battery pack to vent air to the outside through the explosion-proof valve. Through the above steps, the determination of whether the battery pack is in a thermal runaway state is based on the pressure information, temperature information, and voltage information within the battery pack. When it is confirmed that the battery pack is in a thermal runaway state, the explosion-proof valve opens, allowing the battery pack to vent air in a timely manner during thermal runaway, while avoiding the problem of spring-loaded explosion-proof valves easily jamming during thermal runaway.

[0061] According to another aspect of the present invention, a vehicle is provided, the vehicle including a battery pack, the battery pack employing an active battery pack venting method, the active battery pack venting method being the aforementioned active battery pack venting method. The active battery pack venting method includes: acquiring operating condition information of the battery pack, wherein the operating condition information includes at least one of the following: pressure information within the battery pack, temperature information within the battery pack, and voltage information of the battery pack; determining whether the battery pack is in a thermal runaway state based on the operating condition information; and, if it is determined that the battery pack is in a thermal runaway state based on the operating condition information, generating a thermal runaway control strategy set, the thermal runaway control strategy set being used to control the opening of an explosion-proof valve, so that the battery pack vents to the outside through the explosion-proof valve. Through the above steps, the determination of whether the battery pack is in a thermal runaway state is based on the pressure information, temperature information, and voltage information within the battery pack. When it is confirmed that the battery pack is in a thermal runaway state, the explosion-proof valve opens, so that the battery pack can promptly vent thermal runaway during thermal runaway, while avoiding the problem of spring-loaded explosion-proof valves easily jamming during thermal runaway.

[0062] like Figure 3 , Figure 4 As shown, according to another aspect of the present invention, a battery pack is provided, comprising an upper housing assembly 100, a lower housing assembly 200, a battery pack 300, an intelligent explosion-proof valve 400, a pressure sensor 500, a battery management system 600, a pressure sensor wiring harness 700, and an explosion-proof valve wiring harness 900.

[0063] like Figure 6 As shown, a Battery Management System (BMS) is a system used to monitor, control, and protect batteries. It typically consists of hardware and software, managing parameters such as the battery's charging and discharging process, temperature, current, and voltage. The BMS can monitor the battery's status in real time and provide corresponding protection measures, such as overcharge, over-discharge, overcurrent, and over-temperature protection. It can also record and analyze battery usage to optimize battery performance and extend its lifespan. BMS are widely used in electric vehicles, energy storage systems, and solar cell arrays. In this device, the BMS includes a thermal runaway alarm module, a pressure detection module, and an explosion-proof valve control module. The thermal runaway alarm module monitors the state inside the battery pack, the pressure detection module monitors the pressure state inside the battery pack, and the explosion-proof valve control module sends an ignition signal to the battery pack when the opening conditions are met.

[0064] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0065] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0066] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0067] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for active venting of a battery pack, characterized in that, include: Obtain operating condition information of the battery pack, wherein the operating condition information includes at least one of the following: pressure information inside the battery pack, temperature information inside the battery pack, and voltage information of the battery pack; Based on the operating condition information, determine whether the battery pack is in a state of thermal runaway; If the battery pack is determined to be in a thermal runaway state based on the operating condition information, a thermal runaway control strategy set is generated. The thermal runaway control strategy set is used to control the opening of the explosion-proof valve so that the battery pack can vent air to the outside through the explosion-proof valve. Determine if the pressure sensor reading is greater than the explosion-proof valve opening threshold. If the pressure sensor information is determined to be greater than the explosion-proof valve opening threshold, a first control strategy is generated in the thermal runaway control strategy set. The first control strategy is used to send an ignition signal to the explosion-proof valve. The second control strategy in the thermal runaway control strategy set is generated based on the detonation signal. The second control strategy is used to control the detonation device to start, blow open the waterproof and breathable membrane of the explosion-proof valve, so that the battery pack can vent air to the outside through the explosion-proof valve. The explosion-proof valve includes: The bracket (401) has a receiving cavity, and the inner wall of the bracket (401) is provided with an exhaust hole (405) in the circumferential direction. A waterproof and breathable membrane (402) is located on one side of the inner wall of the bracket (401) and is covered on the exhaust hole (405). A detonating device (403) is disposed within the receiving cavity and located inside the waterproof and breathable membrane (402). A sealing ring (406) is disposed circumferentially on the other side of the inner wall of the bracket (401), and the sealing ring (406) is connected to the inner wall of the bracket (401). A wire harness interface (404) is disposed on the inner wall of the bracket (401) and is used for wires to pass through.

2. The active venting method for a battery pack according to claim 1, characterized in that, Determining whether the battery pack is in a thermal runaway state based on the aforementioned operating condition information includes: If the pressure information is greater than the preset pressure information, the temperature information is greater than the preset temperature information, and the voltage information is greater than the preset voltage information, the battery pack is determined to be in a thermal runaway state.

3. The active venting method for a battery pack according to claim 2, characterized in that, Determining whether the battery pack is in a thermal runaway state based on the aforementioned operating condition information includes: If the pressure sensor information is less than the preset pressure sensor information, the temperature information is less than the preset temperature information, and the voltage information is less than the preset voltage information, the battery pack is determined to be in a normal state.

4. The active venting method for a battery pack according to claim 3, characterized in that, If the pressure sensor information is less than a preset pressure sensor information, the temperature information is less than a preset temperature information, and the voltage information is less than a preset voltage information, it is determined that the battery pack is in a normal state, and then the process includes: The operating condition information of the battery pack is obtained, wherein the operating condition information includes at least one of the following: information inside the battery pack, temperature information inside the battery pack, and voltage information inside the battery pack; Based on the operating condition information, it is determined whether the battery pack is in a state of thermal runaway.

5. A battery pack active venting device, characterized in that, include: An acquisition unit is used to acquire operating condition information of the battery pack, wherein the operating condition information includes at least one of the following: pressure information inside the battery pack, temperature information inside the battery pack, and voltage information of the battery pack; The judgment unit is used to determine whether the battery pack is in a thermal runaway state based on the operating condition information; The determining unit is used to generate a thermal runaway control strategy set when it is determined from the operating condition information that the battery pack is in a thermal runaway state. The thermal runaway control strategy set is used to control the explosion-proof valve to open so that the battery pack can vent air to the outside through the explosion-proof valve. Determine if the pressure sensor reading is greater than the explosion-proof valve opening threshold. If the pressure sensor information is determined to be greater than the explosion-proof valve opening threshold, a first control strategy is generated in the thermal runaway control strategy set. The first control strategy is used to send an ignition signal to the explosion-proof valve. The second control strategy in the thermal runaway control strategy set is generated based on the detonation signal. The second control strategy is used to control the detonation device to start, blow open the waterproof and breathable membrane of the explosion-proof valve, so that the battery pack can vent air to the outside through the explosion-proof valve. The explosion-proof valve includes: The bracket (401) has a receiving cavity, and the inner wall of the bracket (401) is provided with an exhaust hole (405) in the circumferential direction. A waterproof and breathable membrane (402) is located on one side of the inner wall of the bracket (401) and is covered on the exhaust hole (405). A detonating device (403) is disposed within the receiving cavity and located inside the waterproof and breathable membrane (402). A sealing ring (406) is disposed circumferentially on the other side of the inner wall of the bracket (401), and the sealing ring (406) is connected to the inner wall of the bracket (401). A wire harness interface (404) is disposed on the inner wall of the bracket (401) and is used for wires to pass through.

6. The active venting device for a battery pack according to claim 5, characterized in that, The bracket (401) is provided with a fixing ring, which is located on the inner ring of the inner wall of the bracket (401). The fixing ring is connected to the inner wall of the bracket (401). Multiple fixing members are provided in the circumferential direction inside the fixing ring. The detonating device (403) is located inside the fixing ring and is connected to the multiple fixing members.

7. The active venting device for a battery pack according to claim 5, characterized in that, The diameter of the vent (405) , Where S is the vent area, Q is the maximum gas production rate during thermal runaway, S1 is the unit area of ​​the vent, and Q1 is the vent area at a pressure difference of [value missing]. The exhaust velocity per unit area at time D is the diameter of the exhaust port, where P is the maximum pressure that the battery pack structure can withstand, and P0 is the ambient pressure.

8. A computer-readable storage medium, characterized in that, include: The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the active venting method for the battery pack according to any one of claims 1 to 4.

9. A vehicle, characterized in that, The vehicle includes a battery pack, which is vented using an active venting method, wherein the active venting method is the active venting method for the battery pack as described in any one of claims 1 to 4.

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