Fire protection methods, devices, electronic equipment, storage media and software products for battery cells

Abstract

This application provides a fire protection method, device, electronic device, storage medium, and program product for battery cells. It relates to the field of fire protection technology for energy storage systems. The method includes: detecting a target value at a target location of a battery cell in a preset battery assembly; wherein the target value characterizes an index value representing the health of the battery cell. The target value is compared with a preset threshold to determine a spraying mode; wherein the spraying mode is used to indicate fire spraying information; the spraying mode includes a thermal anomaly mode and / or a thermal runaway mode. If the spraying mode is determined to be a thermal anomaly mode, a preset inert gas is sprayed onto the battery module at the target location; or, if the spraying mode is determined to be a thermal runaway mode, a preset perfluorohexanone is sprayed onto the battery module at the target location, and after detecting that the perfluorohexanone spraying is complete, inert gas is sprayed onto the battery module at the target location. This method aims to improve the safety of the battery cell in the event of thermal runaway.

Description

Technical Field

[0001] This application relates to the field of fire protection technology for energy storage systems, and in particular to a fire protection method, device, electronic equipment, storage medium, and program product for battery cells. Background Technology

[0002] Currently, Battery Management Systems (BMS), commonly known as battery caretakers or battery managers, are primarily designed for the intelligent management and maintenance of individual battery cells. They monitor cell status, prevent overcharging and over-discharging, and thus extend cell lifespan. Therefore, BMS-based battery management systems are necessary for cell protection.

[0003] In the existing technology, the fire protection method for prefabricated energy storage battery compartments is the fire extinguishing device with a fire detection tube inside the PACK-level battery pack. This method involves installing a fire detection tube fire extinguishing device inside the battery pack. When the temperature of the battery cell reaches the operating temperature of the fire detection tube due to thermal runaway, the fire inhibitor inside the fire detection tube is released to extinguish the fire.

[0004] However, in the existing technology, the fire suppressant dosage of the fire detection tube extinguishing device in the PACK-level battery pack is relatively small, which cannot effectively suppress the thermal runaway of the battery cell, resulting in a low level of safety when the battery cell experiences thermal runaway. Summary of the Invention

[0005] This application provides a fire protection method, device, electronic device, storage medium, and program product for battery cells, which can improve the safety of battery cells in the event of thermal runaway.

[0006] In a first aspect, embodiments of this application provide a fire protection method for a battery cell, comprising:

[0007] The target value is detected at a target location of a battery cell in a preset battery assembly; wherein the target value is an index value representing the health of the battery cell.

[0008] The target value is compared with a preset threshold to determine the spraying mode; wherein, the spraying mode is used to indicate fire spraying information; the spraying mode includes thermal anomaly mode and / or thermal runaway mode;

[0009] If the spraying mode is determined to be a thermal anomaly mode, then a preset inert gas is sprayed onto the battery module at the target location; or, if the spraying mode is determined to be a thermal runaway mode, then a preset perfluorohexanone is sprayed onto the battery module at the target location, and after the perfluorohexanone spraying is detected to be completed, the inert gas is sprayed onto the battery module at the target location.

[0010] In one possible implementation, multiple battery cells form a battery module, and multiple battery modules form a battery cluster; each battery cluster corresponds to a battery cluster control valve; the battery assembly is provided with n battery clusters, where n is a positive integer greater than or equal to 1.

[0011] In one possible implementation, if the spraying mode is determined to be a thermal runaway mode, then a preset perfluorohexanone is sprayed onto the battery module located at the target position, and after the perfluorohexanone spraying is detected to be complete, the inert gas is sprayed onto the battery module, including:

[0012] If the spraying mode is determined to be thermal runaway mode, the target battery cluster control valve corresponding to the battery module at the target location is opened, and the preset perfluorohexanone is sprayed onto the battery module at the target location and other battery modules in the battery cluster where the battery module at the target location is located through the target battery cluster control valve.

[0013] After the perfluorohexanone spraying is detected to be complete, the inert gas is sprayed onto the battery module at the target location and other battery modules in the battery cluster where the battery module at the target location is located.

[0014] In one possible implementation, each battery module corresponds to a separate control solenoid valve; if the spraying mode is determined to be a thermal runaway mode, then a preset perfluorohexanone is sprayed onto the battery module at the target location, and after the perfluorohexanone spraying is detected to be complete, the inert gas is sprayed onto the battery module, including:

[0015] If the spraying mode is determined to be thermal runaway mode, then the target battery cluster sub-control valve corresponding to the battery module where the target location is located, and the target sub-control solenoid valve under the target battery cluster sub-control valve are opened, and the preset perfluorohexanone is sprayed onto the battery module where the target location is located through the target battery cluster sub-control valve and the target sub-control solenoid valve.

[0016] After the perfluorohexanone spraying is detected to be complete, the inert gas is sprayed onto the battery module at the target location.

[0017] In one possible implementation, the battery assembly is provided with a common inert gas pipeline and a perfluorohexanone pipeline; the inert gas pipeline is connected to a pre-set gas production device, and the perfluorohexanone pipeline is connected to a pre-set perfluorohexanone supply device; the inert gas pipeline is provided with a first solenoid valve, and the perfluorohexanone pipeline is provided with a second solenoid valve; the first solenoid valve is used to control the opening or closing of the inert gas pipeline, and the second solenoid valve is used to control the opening or closing of the perfluorohexanone pipeline.

[0018] In one possible implementation, if the spraying mode is determined to be a thermal runaway mode, then a preset perfluorohexanone is sprayed onto the battery module at the target location, and after the perfluorohexanone spraying is detected to be complete, the inert gas is sprayed onto the battery module, including:

[0019] If the spraying mode is determined to be thermal runaway mode, the second solenoid valve is opened to spray the perfluorohexanone in the perfluorohexanone gas tank toward the battery module at the target location.

[0020] After the perfluorohexanone spraying is completed, the first solenoid valve is opened to spray the inert gas generated by the gas production equipment onto the battery module at the target location.

[0021] In one possible implementation, if the spraying mode is determined to be a thermal anomaly mode, then a preset inert gas is sprayed onto the battery module located at the target position, including:

[0022] If the spraying mode is determined to be a thermal anomaly mode, the first solenoid valve is opened to spray the inert gas toward the battery module at the target location.

[0023] In one possible implementation, the target location is the battery cell, or the strain gauge at the explosion-proof valve of the battery cell; comparing the target value with a preset threshold to determine the spraying mode includes:

[0024] If the target value is the temperature value of the battery cell, then when the temperature value is determined to be greater than a preset first thermal threshold, the spraying mode is determined to be a thermal anomaly mode; when the temperature value is determined to be greater than a preset second thermal threshold, the spraying mode is determined to be a thermal runaway mode.

[0025] Alternatively, if the target value is the deformation degree of the explosion-proof valve sensed by the strain gauge, then when the deformation degree is determined to be greater than a preset first deformation threshold, the spraying mode is determined to be a thermal anomaly mode; when the deformation degree is determined to be greater than a preset second deformation threshold, the spraying mode is determined to be a thermal runaway mode.

[0026] Secondly, embodiments of this application provide a fire protection device for a battery cell, comprising:

[0027] The acquisition module is used to detect the target value of the target position of the battery cell in the preset battery assembly; wherein the target value is an index value representing the health of the battery cell;

[0028] The determination module is used to compare the target value with a preset threshold to determine the spraying mode; wherein, the spraying mode is used to indicate fire spraying information; the spraying mode includes a thermal anomaly mode and / or a thermal runaway mode;

[0029] The first spraying module is configured to spray a preset inert gas toward the battery module located at the target position if the spraying mode is determined to be a thermal anomaly mode; or,

[0030] The second spraying module is used to spray a preset perfluorohexanone onto the battery module at the target location if the spraying mode is determined to be a thermal runaway mode, and to spray the inert gas onto the battery module at the target location after the perfluorohexanone spraying is detected to be completed.

[0031] In one possible implementation, multiple battery cells form a battery module, and multiple battery modules form a battery cluster; each battery cluster corresponds to a battery cluster control valve; the battery assembly is provided with n battery clusters, where n is a positive integer greater than or equal to 1.

[0032] In one possible implementation, the second spraying module is specifically used for:

[0033] If the spraying mode is determined to be thermal runaway mode, the target battery cluster control valve corresponding to the battery module at the target location is opened, and the preset perfluorohexanone is sprayed onto the battery module at the target location and other battery modules in the battery cluster where the battery module at the target location is located through the target battery cluster control valve.

[0034] After the perfluorohexanone spraying is detected to be complete, the inert gas is sprayed onto the battery module at the target location and other battery modules in the battery cluster where the battery module at the target location is located.

[0035] In one possible implementation, each battery module corresponds to a separate control solenoid valve; the second spraying module is specifically used for:

[0036] If the spraying mode is determined to be thermal runaway mode, then the target battery cluster sub-control valve corresponding to the battery module where the target location is located, and the target sub-control solenoid valve under the target battery cluster sub-control valve are opened, and the preset perfluorohexanone is sprayed onto the battery module where the target location is located through the target battery cluster sub-control valve and the target sub-control solenoid valve.

[0037] After the perfluorohexanone spraying is detected to be complete, the inert gas is sprayed onto the battery module at the target location.

[0038] In one possible implementation, the battery assembly is provided with a common inert gas pipeline and a perfluorohexanone pipeline; the inert gas pipeline is connected to a pre-set gas production device, and the perfluorohexanone pipeline is connected to a pre-set perfluorohexanone supply device; the inert gas pipeline is provided with a first solenoid valve, and the perfluorohexanone pipeline is provided with a second solenoid valve; the first solenoid valve is used to control the opening or closing of the inert gas pipeline, and the second solenoid valve is used to control the opening or closing of the perfluorohexanone pipeline.

[0039] In one possible implementation, the second spraying module is specifically used for:

[0040] If the spraying mode is determined to be thermal runaway mode, the second solenoid valve is opened to spray the perfluorohexanone in the perfluorohexanone gas tank toward the battery module at the target location.

[0041] After the perfluorohexanone spraying is completed, the first solenoid valve is opened to spray the inert gas generated by the gas production equipment onto the battery module at the target location.

[0042] In one possible implementation, the first spraying module is specifically used for:

[0043] If the spraying mode is determined to be a thermal anomaly mode, the first solenoid valve is opened to spray the inert gas toward the battery module at the target location.

[0044] In one possible implementation, the target location is the battery cell, or the strain gauge at the explosion-proof valve of the battery cell; the determining module is specifically used for:

[0045] If the target value is the temperature value of the battery cell, then when the temperature value is determined to be greater than a preset first thermal threshold, the spraying mode is determined to be a thermal anomaly mode; when the temperature value is determined to be greater than a preset second thermal threshold, the spraying mode is determined to be a thermal runaway mode.

[0046] Alternatively, if the target value is the deformation degree of the explosion-proof valve sensed by the strain gauge, then when the deformation degree is determined to be greater than a preset first deformation threshold, the spraying mode is determined to be a thermal anomaly mode; when the deformation degree is determined to be greater than a preset second deformation threshold, the spraying mode is determined to be a thermal runaway mode.

[0047] Thirdly, embodiments of this application provide an electronic device, including: a memory and a processor;

[0048] The memory stores computer-executed instructions;

[0049] The processor executes computer execution instructions stored in the memory, causing the processor to perform the first aspect and / or various possible implementations of the first aspect as described above.

[0050] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the first aspect and / or various possible implementations of the first aspect.

[0051] Fifthly, embodiments of this application provide a computer program product, including a computer program that, when executed by a processor, implements the first aspect and / or various possible implementations of the first aspect.

[0052] The fire protection method, device, electronic equipment, storage medium, and program product for battery cells provided in this application embodiment detect a target value at a target location of a battery cell in a preset battery assembly; wherein, the target value characterizes an index value of the battery cell's health. The target value is compared with a preset threshold to determine a spraying mode; wherein, the spraying mode is used to indicate fire spraying information; the spraying mode includes a thermal anomaly mode and / or a thermal runaway mode. If the spraying mode is determined to be a thermal anomaly mode, a preset inert gas is sprayed onto the battery module at the target location; or, if the spraying mode is determined to be a thermal runaway mode, a preset perfluorohexanone is sprayed onto the battery module at the target location, and after the perfluorohexanone spraying is detected to be complete, inert gas is sprayed onto the battery module at the target location. In this solution, when an abnormal temperature is detected reaching an abnormal state, inert gas is used for fire suppression; when the temperature exceeds the abnormality and reaches a runaway state, perfluorohexanone is used for fire suppression; and after the perfluorohexanone release is complete, inert gas spraying continues. Therefore, combining perfluorohexanone fire extinguishing can achieve precise and rapid fire extinguishing, cooling and protection effects. It can quickly cool down and isolate oxygen, and quickly and effectively control the thermal runaway state of the battery. In this way, it can provide comprehensive protection before, during and after thermal runaway, improve the safety of battery fire protection, and thus improve the safety of the battery cell during thermal runaway. Attached Figure Description

[0053] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0054] Figure 1 A flowchart illustrating a fire protection method for a battery cell provided in this application embodiment. Figure 1 ;

[0055] Figure 2 A flowchart illustrating another fire protection method for a battery cell provided in this application embodiment. Figure 2 ;

[0056] Figure 3 A circuit diagram of a fire protection method for a battery cell provided in this application;

[0057] Figure 4 A schematic diagram of the structure of a fire protection device for a battery cell provided in an embodiment of this application;

[0058] Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0059] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0060] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0061] Currently, Battery Management Systems (BMS), commonly known as battery caretakers or battery managers, are primarily designed for the intelligent management and maintenance of individual battery cells. They monitor cell status, prevent overcharging and over-discharging, and thus extend cell lifespan. Therefore, BMS-based battery management systems are necessary for cell protection.

[0062] In one example, the existing fire suppression system for prefabricated energy storage battery compartments uses a fire-detecting tube extinguishing device within the battery pack. This system involves installing a fire-detecting tube extinguishing device inside the battery pack. When the temperature of a battery cell experiences thermal runaway and reaches the operating temperature of the fire-detecting tube, a fire suppressant is released within the tube to extinguish the fire. However, in this existing technology, the dosage of fire suppressant in the fire-detecting tube extinguishing device within the battery pack is relatively small, which cannot effectively suppress thermal runaway of the battery cells, resulting in a low level of safety during thermal runaway.

[0063] In one example, existing fire suppression methods for prefabricated energy storage battery compartments include in-pack fire detectors. This method detects thermal runaway by installing fire detectors inside the battery pack. Once the detector detects thermal runaway, the fire suppression system activates, and extinguishing agent is sprayed into the corresponding battery pack through nozzles to extinguish the fire. However, the in-pack detectors are installed on the front access panel of the battery pack, have a limited detection range, and are prone to false alarms.

[0064] In one example, existing fire suppression methods for prefabricated energy storage battery compartments include roof-mounted detectors, which install heat, smoke, and combustible gas detectors on the top of the prefabricated compartment. When these detectors detect a fire signal, the fire suppression system activates, performing total flooding to extinguish the fire throughout the entire compartment. However, compartment-level extinguishing agents cannot effectively control thermal runaway in its early stages and cannot accurately locate the location of the runaway. In another example, existing fire suppression methods for prefabricated energy storage battery compartments include battery pack gas fire sprinklers. This method installs gas fire sprinklers on the battery pack, which spray perfluorohexanone into the battery pack to extinguish the fire in the event of thermal runaway. However, the fire sprinklers can only be connected to quick-connect gas fire sprinklers, are highly susceptible to system pressure variations, and the battery pack only has the male nozzle portion installed, making it difficult to match the female nozzle portion.

[0065] Based on the above scenarios, it can be seen that existing technologies have a low level of safety during battery thermal runaway.

[0066] The fire protection method for battery cells provided in this application uses perfluorohexanone to extinguish the fire when the temperature exceeds the abnormal level and reaches a runaway state. After the perfluorohexanone is released, inert gas is sprayed continuously, which solves the technical problem of low safety during battery thermal runaway.

[0067] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0068] Figure 1 A schematic flowchart of a fire protection method for a battery cell provided in this application. Figure 1 ,like Figure 1 As shown, the method includes:

[0069] S101, Detect the target value of the target position of the battery cell in the preset battery assembly; wherein, the target value is an index value that represents the health of the battery cell.

[0070] For example, the executing entity of this embodiment can be an electronic device, a terminal device, a fire protection device or equipment for the battery cell, a fire protection system for the battery cell, or other devices or equipment capable of executing this embodiment, and there are no limitations on this. In this embodiment, the executing entity is described as an electronic device.

[0071] First, the electronic device is equipped with a Battery Management System (BMS). Multiple battery cells are connected in series to form a battery module (PACK), and multiple battery modules are connected in series to form a battery cluster. Multiple battery clusters are connected in parallel to form a battery assembly, i.e., a battery PACK. Each battery cluster corresponds to a battery cluster control valve. Furthermore, each battery module can also correspond to a control solenoid valve. The battery assembly has n battery clusters, i.e., n battery cluster control valves, where n is a positive integer greater than or equal to 1.

[0072] In this step, the target value at the target location of each cell in the preset battery assembly is detected. The target value represents the health index of the cell; the target location can be the cell itself, or the strain gauge at the cell's explosion-proof valve, that is, the target value can be the cell's temperature value, or the deformation degree of the strain gauge.

[0073] S102. Compare the target value with the preset threshold to determine the spraying mode; wherein, the spraying mode is used to indicate fire spraying information; the spraying mode includes thermal anomaly mode and / or thermal runaway mode.

[0074] For example, the spraying mode is used to indicate fire spraying information, that is, spraying instruction information for target fire operation under different modes. The target value is compared with a preset threshold. If the target value is the temperature value of the battery cell, then when the temperature value is determined to be greater than the preset first threshold T1, the spraying mode is determined to be a thermal anomaly mode; when the temperature value is determined to be greater than the preset second threshold T2, the spraying mode is determined to be a thermal runaway mode.

[0075] Alternatively, if the target value is the deformation degree of the explosion-proof valve sensed by the strain gauge, then when the deformation degree is determined to be greater than the preset first deformation threshold T3, the spraying mode is determined to be the thermal anomaly mode; when the deformation degree is determined to be greater than the preset second deformation threshold T4, the spraying mode is determined to be the thermal runaway mode. Where T2 is greater than T1, and T4 is greater than T3.

[0076] S103. If the spraying mode is determined to be thermal anomaly mode, the preset inert gas is sprayed onto the battery module at the target location; or, if the spraying mode is determined to be thermal runaway mode, the preset perfluorohexanone is sprayed onto the battery module at the target location, and after the perfluorohexanone spraying is detected to be completed, inert gas is sprayed onto the battery module at the target location.

[0077] For example, if the spraying mode is determined to be a thermal anomaly mode, a pre-set inert gas is directly sprayed onto the battery module at the target location. Alternatively, if the spraying mode is determined to be a thermal runaway mode, pre-stored perfluorohexanone is sprayed onto the battery module at the target location. After all the stored perfluorohexanone has been sprayed, pre-stored inert gas is continuously sprayed onto the battery module at the target location until it is determined that the battery at the target location has been updated to a new healthy state, at which point the spraying of inert gas stops.

[0078] The inert gas can be nitrogen, carbon dioxide, or other similar substances, without limitation. Besides perfluorohexanone, other firefighting media such as water-based fire suppression or aerosols can also be sprayed during thermal anomaly and / or thermal runaway modes, without limitation. Taking nitrogen as an example, nitrogen can be stored in nitrogen cylinders; alternatively, dry nitrogen can be produced using molecular sieve nitrogen generators or membrane separation to serve as an inert gas and prevent moisture condensation inside the PACK and corrosion of electrical components. Continuous nitrogen production using nitrogen generators is cost-effective, eliminates the need for nitrogen cylinder maintenance, and nitrogen does not cause any negative effects, thus avoiding adverse consequences from accidental contact.

[0079] Therefore, the cell temperature can be monitored in real time to determine various states such as normal, thermal abnormality, and thermal runaway. When the cell is determined to be in a thermal abnormality state but has not yet reached thermal runaway, nitrogen gas is introduced to enter the protection state. When the temperature reaches thermal runaway, perfluorohexanone is switched to the protective gas. After the perfluorohexanone is released, nitrogen gas is switched back. Thus, comprehensive protection can be provided before, during and after thermal runaway, improving the safety of battery fire prevention.

[0080] The fire protection method for battery cells provided in this application embodiment detects a target value at a target location of a battery cell in a preset battery assembly; wherein the target value represents an index value of the battery cell's health. The target value is compared with a preset threshold to determine a spraying mode; wherein the spraying mode is used to indicate fire spraying information; the spraying mode includes a thermal anomaly mode and / or a thermal runaway mode. If the spraying mode is determined to be a thermal anomaly mode, a preset inert gas is sprayed onto the battery module at the target location; or, if the spraying mode is determined to be a thermal runaway mode, a preset perfluorohexanone is sprayed onto the battery module at the target location, and after the perfluorohexanone spraying is detected to be complete, inert gas is sprayed onto the battery module at the target location. In this scheme, when an abnormal temperature is detected reaching an abnormal state, inert gas is used for fire suppression; when the temperature exceeds the abnormality and reaches a runaway state, perfluorohexanone is used for fire suppression; and after the perfluorohexanone is released, inert gas spraying continues. Therefore, combining perfluorohexanone fire extinguishing can achieve precise and rapid fire extinguishing, cooling and protection effects. It can quickly cool down and isolate oxygen, and quickly and effectively control the thermal runaway state of the battery. In this way, it can provide comprehensive protection before, during and after thermal runaway, improve the safety of battery fire protection, and thus improve the safety of the battery cell during thermal runaway.

[0081] Figure 2 A schematic flowchart of a fire protection method for a battery cell provided in this application. Figure 2 ,like Figure 2 As shown, in this embodiment... Figure 1 Based on the embodiments, a fire protection method for battery cells is described in detail, which includes:

[0082] S201. Detect the target value of the target position of the battery cell in the preset battery assembly; wherein, the target value is an index value that characterizes the health of the battery cell.

[0083] For example, this step can be referred to Figure 1 Step 101 in the text will not be repeated here.

[0084] S202. Compare the target value with the preset threshold to determine the spraying mode; wherein, the spraying mode is used to indicate fire spraying information; the spraying mode includes thermal anomaly mode and / or thermal runaway mode.

[0085] In one example, S202 includes: the target location is a battery cell, or a strain gauge at the explosion-proof valve of the battery cell; if the target value is the temperature value of the battery cell, then when the temperature value is determined to be greater than a preset first thermal threshold, the spraying mode is determined to be a thermal anomaly mode; when the temperature value is determined to be greater than a preset second thermal threshold, the spraying mode is determined to be a thermal runaway mode.

[0086] Alternatively, if the target value is the deformation degree of the explosion-proof valve sensed by the strain gauge, then when the deformation degree is determined to be greater than the preset first deformation threshold, the spraying mode is determined to be the thermal anomaly mode; when the deformation degree is determined to be greater than the preset second deformation threshold, the spraying mode is determined to be the thermal runaway mode.

[0087] For example, the spraying mode is used to indicate fire spraying information, that is, spraying instruction information for target fire operation under different modes. The target value is compared with a preset threshold. If the target location is a battery cell and the target value is the temperature value of the battery cell itself, then when the temperature value is determined to be greater than the preset first threshold T1, the spraying mode is determined to be a thermal anomaly mode; when the temperature value is determined to be greater than the preset second threshold T2, the spraying mode is determined to be a thermal runaway mode.

[0088] Alternatively, if the target location is the strain gauge at the explosion-proof valve of the battery cell, and the target value is the deformation of the explosion-proof valve sensed by the strain gauge, then when the deformation is determined to be greater than a preset first deformation threshold T3, the spraying mode is determined to be the thermal anomaly mode; when the deformation is determined to be greater than a preset second deformation threshold T4, the spraying mode is determined to be the thermal runaway mode. Where T2 is greater than T1, and T4 is greater than T3.

[0089] S203. If the spraying mode is determined to be the thermal anomaly mode, the preset inert gas will be sprayed toward the battery module at the target location.

[0090] In one example, the battery assembly is equipped with a common inert gas pipeline and a perfluorohexanone pipeline; the inert gas pipeline is connected to a pre-set gas production device, and the perfluorohexanone pipeline is connected to a pre-set perfluorohexanone supply device; the inert gas pipeline is equipped with a first solenoid valve, and the perfluorohexanone pipeline is equipped with a second solenoid valve; the first solenoid valve is used to control the opening or closing of the inert gas pipeline, and the second solenoid valve is used to control the opening or closing of the perfluorohexanone pipeline.

[0091] In one example, S203 includes: if it is determined that the spraying mode is a thermal anomaly mode, then opening the first solenoid valve to spray inert gas toward the target location.

[0092] For example, the battery assembly is provided with a common inert gas pipeline and a perfluorohexanone pipeline. Figure 3 A circuit diagram of a fire protection method for a battery cell provided in this application, such as... Figure 3As shown, the system includes a perfluorohexanone (PFH) supply device (using a PPH gas tank as an example), a gas production device (using a nitrogen generator as an example), a first solenoid valve A, a second solenoid valve B, an inert gas pipeline connected to the first solenoid valve A, and a PPH pipeline connected to the second solenoid valve B. The inert gas pipeline is connected to the preset gas production device, and the PPH pipeline is connected to the preset PPH supply device. The first solenoid valve controls the opening and closing of the inert gas pipeline, and the second solenoid valve controls the opening and closing of the PPH pipeline. If the spraying mode is determined to be a thermal anomaly mode, the electronic equipment opens the preset first solenoid valve, spraying the inert gas towards the target location. During the spraying process, the temperature change is monitored in real time. If the temperature value recovers to a value lower than T1, the first solenoid valve A is shut off, and the gas production device is closed. The inert gas can be nitrogen, carbon dioxide, etc., and is not limited thereto.

[0093] Therefore, in the case of thermal anomalies, only inert gases such as nitrogen are used as inertization protection. Inert gases can isolate oxygen and avoid problems such as short-circuit oxidation.

[0094] S204. If the spraying mode is determined to be thermal runaway mode, the preset perfluorohexanone is sprayed onto the battery module at the target location, and after the perfluorohexanone spraying is detected to be completed, inert gas is sprayed onto the battery module.

[0095] In one example, multiple battery cells form a battery module, and multiple battery modules form a battery cluster; each battery cluster corresponds to a battery cluster control valve; the battery assembly is equipped with n battery clusters, where n is a positive integer greater than or equal to 1.

[0096] In one example, step 203 includes multiple implementations:

[0097] The first implementation of step 204: If the spraying mode is determined to be thermal runaway mode, then open the target battery cluster sub-control valve corresponding to the battery module at the target location, and spray the preset perfluorohexanone to the battery module at the target location and other battery modules in the battery cluster where the battery module at the target location is located through the target battery cluster sub-control valve; after detecting that the perfluorohexanone spraying is completed, spray inert gas to the battery module at the target location and other battery modules in the battery cluster where the battery module at the target location is located.

[0098] The second implementation of step 204: Each battery module corresponds to a sub-control solenoid valve; if the spraying mode is determined to be thermal runaway mode, then open the target battery cluster sub-control valve corresponding to the battery module at the target location, as well as the target sub-control solenoid valve under the target battery cluster sub-control valve, and spray the preset perfluorohexanone to the battery module at the target location through the target battery cluster sub-control valve and the target sub-control solenoid valve; after detecting that the perfluorohexanone spraying is completed, spray inert gas to the battery module at the target location.

[0099] The third implementation of step 204: If the spraying mode is determined to be thermal runaway mode, the second solenoid valve is opened to spray the perfluorohexanone in the perfluorohexanone gas tank toward the battery module at the target location; after the perfluorohexanone spraying is detected to be completed, the first solenoid valve is opened to spray the inert gas generated by the gas production equipment toward the battery module at the target location.

[0100] For example, such as Figure 3 As shown, it includes: perfluorohexanone supply equipment (taking a perfluorohexanone gas tank as an example), gas production equipment (taking a nitrogen generator as an example), a first solenoid valve A, a second solenoid valve B, and n battery clusters (refer to...). Figure 3 The dashed box in the diagram represents one battery cluster and n individual control valves for each battery cluster. The system acquires the battery signal for each PACK. If the spraying mode is determined to be thermal runaway mode based on the PACK's battery signal, the electronic equipment sprays perfluorohexanone (PFH) stored in the perfluorohexanone gas tank onto the battery module at the target location. After detecting that all the stored PPHH has been sprayed, the system continuously sprays inert gas generated by the gas production equipment onto the battery module at the target location until the battery at the target location is determined to be in a new healthy state, at which point the inert gas spraying stops. The battery signal can be the temperature signal of the battery cell (i.e., the temperature value) or the deformation degree of the explosion-proof valve; there is no limitation on this.

[0101] Specifically, in the first implementation method, such as Figure 3 As shown, if the spraying mode is determined to be thermal runaway mode, the second solenoid valve B and the target battery cluster control valve corresponding to the battery module at the target location are opened. Through the second solenoid valve B and the target battery cluster control valve, perfluorohexanone from the perfluorohexanone gas tank is sprayed onto the battery module at the target location and other battery modules within the battery cluster containing the battery module at the target location. This means perfluorohexanone is injected into all PACKs corresponding to the battery cluster for fire protection. After the stored perfluorohexanone has been completely sprayed, inert gas is sprayed onto the battery module at the target location and other battery modules within the battery cluster containing the battery module at the target location.

[0102] In the second implementation, such as Figure 3As shown, each battery module (i.e., PACK1…n) has a corresponding sub-control solenoid valve. If the spraying mode is determined to be thermal runaway mode, the second solenoid valve B, the target battery cluster sub-control valve corresponding to the battery module at the target location, and the target sub-control solenoid valve under the target battery cluster sub-control valve are opened. Perfluorohexanone is sprayed onto the battery module at the target location through the second solenoid valve B, the target battery cluster sub-control valve, and the target sub-control solenoid valve. After the perfluorohexanone spraying is detected to be complete, inert gas is sprayed onto the battery module at the target location. Therefore, by setting up a separate sub-control solenoid valve for each PACK, it is possible to accurately determine whether the PACK is in an abnormal state and inject inert gas or perfluorohexanone into the PACK individually, making cell fire suppression more effective and precise.

[0103] In the third implementation, such as Figure 3 As shown, the battery assembly is equipped with a shared inert gas pipeline and a perfluorohexanone (PFH) pipeline. The inert gas pipeline is connected to a gas production device, and the PFH pipeline is connected to a pre-installed PFH supply device. The inert gas pipeline is equipped with a first solenoid valve A, and the PFH pipeline is equipped with a second solenoid valve B. If the spraying mode is determined to be thermal runaway mode, the second solenoid valve B is opened, spraying the PFH from the PFH tank onto the battery module at the target location. After the PFH spraying is detected to be complete, the second solenoid valve B is closed, the first solenoid valve A is opened, and the inert gas pipeline is reconnected, spraying the inert gas generated by the gas production device onto the battery module at the target location, continuously flushing inert gas for protection. Therefore, since the added nitrogen pipeline can run parallel to the PFH pipeline in a fire protection network, there will be no leakage at quick-connect nozzles and other joints, and even if there is leakage, it will not cause any negative impact.

[0104] Alternatively, in addition to the above three methods, if the current mode changes from thermal anomaly mode to thermal runaway mode, then close the first solenoid valve A, open the second solenoid valve B, activate the perfluorohexanone protection device of the fire protection system, that is, spray the perfluorohexanone in the perfluorohexanone gas tank towards the battery module at the target location, and after detecting that the perfluorohexanone spraying is completed, close the second solenoid valve B, open the first solenoid valve A, reconnect the inert gas pipeline, and spray the inert gas generated by the gas production equipment towards the battery module at the target location.

[0105] The fire protection method for battery cells provided in this application embodiment detects a target value at a target location of a battery cell in a preset battery assembly; wherein the target value represents an index value of the battery cell's health. The target value is compared with a preset threshold to determine a spraying mode; wherein the spraying mode is used to indicate fire spraying information; the spraying mode includes a thermal anomaly mode and / or a thermal runaway mode. If the spraying mode is determined to be a thermal anomaly mode, a preset inert gas is sprayed onto the battery module at the target location. If the spraying mode is determined to be a thermal runaway mode, a preset perfluorohexanone is sprayed onto the battery module at the target location, and after the perfluorohexanone spraying is detected to be complete, inert gas is sprayed onto the battery module. Therefore, combining perfluorohexanone fire extinguishing can achieve precise and rapid fire extinguishing and cooling protection effects, can quickly cool down and isolate oxygen, and rapidly and effectively control the thermal runaway state of the battery, thereby providing comprehensive protection before, during, and after thermal runaway, improving the safety of battery fire protection, and thus enhancing the safety of the battery cell during thermal runaway.

[0106] Figure 4 A structural schematic diagram of a fire protection device for a battery cell provided in this application is shown below. Figure 4 As shown, the fire protection device 30 for the battery cell provided in this embodiment includes:

[0107] The acquisition module 31 is used to detect the target value of the target position of the battery cell in the preset battery assembly; wherein, the target value represents the health index value of the battery cell;

[0108] The determination module 32 is used to compare the target value with a preset threshold to determine the spraying mode; wherein, the spraying mode is used to indicate fire spraying information; the spraying mode includes thermal anomaly mode and / or thermal runaway mode;

[0109] The first spraying module 33 is used to spray a preset inert gas toward the battery module at the target location if the spraying mode is determined to be a thermal anomaly mode; or,

[0110] The second spraying module 34 is used to spray a preset perfluorohexanone onto the battery module at the target location if the spraying mode is determined to be thermal runaway mode, and to spray an inert gas onto the battery module at the target location after the perfluorohexanone spraying is detected to be completed.

[0111] exist Figure 4 Based on the embodiments shown, this application provides a structural schematic diagram of another fire protection device for battery cells, including: multiple battery cells forming a battery module, multiple battery modules forming a battery cluster; each battery cluster corresponds to a battery cluster control valve; the battery assembly is provided with n battery clusters, where n is a positive integer greater than or equal to 1.

[0112] In one possible implementation, the second spraying module 34 is specifically used for:

[0113] If the spraying mode is determined to be thermal runaway mode, the target battery cluster sub-control valve corresponding to the battery module at the target location is opened, and the preset perfluorohexanone is sprayed to the battery module at the target location and other battery modules in the battery cluster where the battery module at the target location is located through the target battery cluster sub-control valve.

[0114] After the perfluorohexanone spraying is completed, inert gas is sprayed onto the battery module at the target location and other battery modules in the battery cluster where the battery module at the target location is located.

[0115] In one possible implementation, each battery module corresponds to a sub-controlled solenoid valve; the second spraying module 34 is specifically used for:

[0116] If the spraying mode is determined to be thermal runaway mode, the target battery cluster sub-control valve corresponding to the battery module where the target location is located, as well as the target sub-control solenoid valve under the target battery cluster sub-control valve, are opened, and the preset perfluorohexanone is sprayed onto the battery module where the target location is located through the target battery cluster sub-control valve and the target sub-control solenoid valve.

[0117] After the perfluorohexanone spraying is completed, inert gas is sprayed onto the battery module at the target location.

[0118] In one possible implementation, the battery assembly is provided with a common inert gas pipeline and a perfluorohexanone pipeline; the inert gas pipeline is connected to a pre-set gas production device, and the perfluorohexanone pipeline is connected to a pre-set perfluorohexanone supply device; the inert gas pipeline is equipped with a first solenoid valve, and the perfluorohexanone pipeline is equipped with a second solenoid valve; the first solenoid valve is used to control the opening or closing of the inert gas pipeline, and the second solenoid valve is used to control the opening or closing of the perfluorohexanone pipeline.

[0119] In one possible implementation, the second spraying module 34 is specifically used for:

[0120] If the spraying mode is determined to be thermal runaway mode, the second solenoid valve is opened to spray the perfluorohexanone in the perfluorohexanone gas tank toward the battery module at the target location.

[0121] After the perfluorohexanone spraying is completed, the first solenoid valve is opened to spray the inert gas generated by the gas production equipment onto the battery module at the target location.

[0122] In one possible implementation, the first spraying module 33 is specifically used for:

[0123] If the spraying mode is determined to be the thermal anomaly mode, the first solenoid valve is opened to spray inert gas toward the battery module at the target location.

[0124] In one possible implementation, the target location is the battery cell, or the strain gauge at the explosion-proof valve of the battery cell; the determining module 32 is specifically used for:

[0125] If the target value is the temperature of the battery cell, then when the temperature value is determined to be greater than the preset first thermal threshold, the spraying mode is determined to be the thermal anomaly mode; when the temperature value is determined to be greater than the preset second thermal threshold, the spraying mode is determined to be the thermal runaway mode.

[0126] Alternatively, if the target value is the deformation degree of the explosion-proof valve sensed by the strain gauge, then when the deformation degree is determined to be greater than the preset first deformation threshold, the spraying mode is determined to be the thermal anomaly mode; when the deformation degree is determined to be greater than the preset second deformation threshold, the spraying mode is determined to be the thermal runaway mode.

[0127] The apparatus provided in this embodiment can execute the method provided in the above method embodiment. Its implementation principle and technical effect are similar, and will not be described in detail here.

[0128] Figure 5 A schematic diagram of the structure of the electronic device provided in this application. Figure 5 As shown, the electronic device 50 provided in this embodiment includes at least one processor 501 and a memory 502. Optionally, the device 50 further includes a communication component 503. The processor 501, memory 502, and communication component 503 are connected via a bus 504.

[0129] In a specific implementation, at least one processor 501 executes computer execution instructions stored in memory 502, causing at least one processor 501 to perform the above-described method.

[0130] The specific implementation process of processor 501 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.

[0131] In the above embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.

[0132] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device.

[0133] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.

[0134] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.

[0135] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the above-described method.

[0136] The aforementioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.

[0137] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in the device.

[0138] The division of units is merely a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0139] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0140] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0141] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0142] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0143] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A fire protection method for a battery cell, characterized in that, include: The target value is detected at a target location of a battery cell in a preset battery assembly; wherein the target value is an index value representing the health of the battery cell; wherein the target location is a strain gauge at the explosion-proof valve of the battery cell, and the target value is the deformation degree of the explosion-proof valve sensed by the strain gauge; The target value is compared with a preset threshold to determine the spraying mode; wherein, the spraying mode is used to indicate fire spraying information; the spraying mode includes thermal anomaly mode and / or thermal runaway mode; If the spraying mode is determined to be a thermal anomaly mode, a preset inert gas is sprayed onto the battery module at the target location; or, if the spraying mode is determined to be a thermal runaway mode, a preset perfluorohexanone is sprayed onto the battery module at the target location to extinguish the fire and cool it down, and after the perfluorohexanone spraying is detected to be completed, the inert gas is sprayed onto the battery module at the target location to isolate oxygen. The spraying mode is determined by comparing the target value with a preset threshold, including: when the deformation degree is determined to be greater than a preset first deformation threshold, the spraying mode is determined to be a thermal anomaly mode; when the deformation degree is determined to be greater than a preset second deformation threshold, the spraying mode is determined to be a thermal runaway mode, wherein the second deformation threshold is greater than the first deformation threshold.

2. The method according to claim 1, characterized in that, Multiple battery cells form a battery module, and multiple battery modules form a battery cluster; each battery cluster corresponds to a battery cluster control valve; the battery assembly is provided with n battery clusters, where n is a positive integer greater than or equal to 1.

3. The method according to claim 2, characterized in that, If the spraying mode is determined to be thermal runaway mode, then the preset perfluorohexanone is sprayed onto the battery module located at the target position, and after the perfluorohexanone spraying is detected to be completed, the inert gas is sprayed onto the battery module, including: If the spraying mode is determined to be thermal runaway mode, the target battery cluster control valve corresponding to the battery module at the target location is opened, and the preset perfluorohexanone is sprayed onto the battery module at the target location and other battery modules in the battery cluster where the battery module at the target location is located through the target battery cluster control valve. After the perfluorohexanone spraying is detected to be complete, the inert gas is sprayed onto the battery module at the target location and other battery modules in the battery cluster where the battery module at the target location is located.

4. The method according to claim 2, characterized in that, Each battery module corresponds to a separate control solenoid valve; if the spraying mode is determined to be thermal runaway mode, then a preset perfluorohexanone is sprayed onto the battery module at the target location, and after the perfluorohexanone spraying is detected to be complete, the inert gas is sprayed onto the battery module, including: If the spraying mode is determined to be thermal runaway mode, then the target battery cluster sub-control valve corresponding to the battery module where the target location is located, and the target sub-control solenoid valve under the target battery cluster sub-control valve are opened, and the preset perfluorohexanone is sprayed onto the battery module where the target location is located through the target battery cluster sub-control valve and the target sub-control solenoid valve. After the perfluorohexanone spraying is detected to be complete, the inert gas is sprayed onto the battery module at the target location.

5. The method according to claim 1, characterized in that, The battery assembly is equipped with a common inert gas pipeline and a perfluorohexanone pipeline; the inert gas pipeline is connected to a pre-set gas production device, and the perfluorohexanone pipeline is connected to a pre-set perfluorohexanone supply device; the inert gas pipeline is equipped with a first solenoid valve, and the perfluorohexanone pipeline is equipped with a second solenoid valve; the first solenoid valve is used to control the opening or closing of the inert gas pipeline, and the second solenoid valve is used to control the opening or closing of the perfluorohexanone pipeline.

6. The method according to claim 5, characterized in that, If the spraying mode is determined to be a thermal runaway mode, then the preset perfluorohexanone is sprayed onto the battery module at the target location, and after the perfluorohexanone spraying is detected to be completed, the inert gas is sprayed onto the battery module, including: If the spraying mode is determined to be thermal runaway mode, the second solenoid valve is opened to spray the perfluorohexanone in the perfluorohexanone gas tank toward the battery module at the target location. After the perfluorohexanone spraying is completed, the first solenoid valve is opened to spray the inert gas generated by the gas production equipment onto the battery module at the target location.

7. The method according to claim 5, characterized in that, If the spraying mode is determined to be a thermal anomaly mode, then a preset inert gas is sprayed onto the battery module located at the target position, including: If the spraying mode is determined to be a thermal anomaly mode, the first solenoid valve is opened to spray the inert gas toward the battery module at the target location.

8. A fire protection device for a battery cell, characterized in that, include: An acquisition module is used to detect a target value at a target location of a battery cell in a preset battery assembly; wherein the target value represents an index value of the health of the battery cell; wherein the target location is a strain gauge at the explosion-proof valve of the battery cell, and the target value is the deformation degree of the explosion-proof valve sensed by the strain gauge; The determination module is used to compare the target value with a preset threshold to determine the spraying mode; wherein, the spraying mode is used to indicate fire spraying information; the spraying mode includes a thermal anomaly mode and / or a thermal runaway mode; The first spraying module is configured to spray a preset inert gas toward the battery module located at the target position if the spraying mode is determined to be a thermal anomaly mode; or, The second spraying module is used to spray a preset perfluorohexanone onto the battery module at the target location to extinguish the fire and cool it down if the spraying mode is determined to be thermal runaway mode, and to spray the inert gas onto the battery module at the target location after the perfluorohexanone spraying is completed to isolate oxygen. The determining module is specifically used to determine the spraying mode as a thermal anomaly mode when the deformation degree is greater than a preset first deformation threshold; and to determine the spraying mode as a thermal runaway mode when the deformation degree is greater than a preset second deformation threshold, wherein the second deformation threshold is greater than the first deformation threshold.

9. An electronic device, characterized in that, include: Memory, processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory, causing the processor to perform the method as described in any one of claims 1-7.

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