Battery safety protection inert gas rapid inflation method and system

Abstract

The invention provides a battery safety protection inert gas rapid inflation method and system, and relates to the technical field of new energy automobile battery safety, a combined strategy of simultaneous inflation of all battery packs, secondary inflation and dichotomy inflation is adopted, filling of most of the battery packs can be completed through first inflation, and filling of the most of the battery packs can be completed through second inflation. Compared with a traditional single-box successive inflation mode, the method has the advantages that the overall inflation time is greatly shortened, energy waste is avoided, and the response speed in an emergency scene is increased. In addition, control functions of manufacturing, storage, inflation, airtightness detection and the like of inert gas are directly integrated in an existing battery management system BMS, independent control system software and hardware do not need to be additionally configured, and compared with a traditional external inert gas control system, the extra cost of a single vehicle can be reduced, and meanwhile the occupied space of the system is reduced. And the battery system architecture of the existing new energy vehicle is adapted, and industrial popularization and application are facilitated.

Description

Technical Field

[0001] This application relates to the field of new energy vehicle battery safety technology, and more specifically, to a method and system for rapid charging of battery safety protection inert gas. Background Technology

[0002] As the market penetration rate of new energy vehicles continues to increase, battery safety issues are becoming increasingly prominent. Fires and explosions caused by battery thermal runaway occur frequently every year, seriously threatening the lives of drivers and passengers. To address this problem, various technical solutions have emerged in the industry, but all have significant drawbacks: Some battery manufacturers use external fire suppression systems to activate fire suppression mechanisms in the event of battery thermal runaway, thereby reducing personnel injury. However, such systems require additional independent controllers and fire extinguishing agent storage devices, increasing the cost per vehicle by 10,000 to 20,000 yuan and significantly raising the manufacturing costs of the battery system and the entire vehicle. Other manufacturers use external inert gas control systems, achieving safety protection by sequentially filling each battery pack with gas. However, this filling mode is extremely inefficient, with each pack taking a long time to fill, making it difficult to quickly fill all battery packs with inert gas and thus unable to cope with emergency thermal runaway scenarios. Still other manufacturers use physical isolation solutions, independently isolating each battery cell to prevent heat spread. However, the additional isolation materials and space lead to a significant decrease in the volumetric energy density and gravimetric energy density of the battery system, affecting the range and spatial layout of new energy vehicles. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a method and system for rapid charging of battery safety protection inert gas, which can improve charging efficiency by integrating control functions into the existing battery management system (BMS) and adopting a combination strategy of simultaneous charging of all battery packs, secondary charging, and bi-stage charging.

[0004] In a first aspect, embodiments of this application provide a method for rapid charging of inert gas for battery safety protection, applied to the battery system of a new energy vehicle. The battery system includes a battery management system (BMS), multiple battery packs, a gas storage tank, inert gas pipelines, and solenoid valves. The BMS includes a battery pack main controller (BMU) and multiple battery pack cluster controllers (CSCs), with one CSC configured for each battery pack. The method includes the following steps: S1. Perform an airtightness test on the inert gas pipeline and storage tank; if the test result is normal, proceed to step S2; if the test result is abnormal, report the airtightness fault and stop the inflation process. S2. Send inflation commands to all CSCs via BMU, control the opening of the solenoid valve of the corresponding battery pack and monitor the pressure in real time; when the pressure reaches the preset threshold P0, BMU controls the solenoid valve to close; and when the time reaches the preset time T0, determine whether the pressure of all battery packs has reached the preset threshold P0. If they have all reached it, proceed to step S3; otherwise, store the number of the battery pack that did not meet the standard and proceed to step S5. S3. Hold the pressure of the battery pack that has reached the preset threshold P0 for a preset time t1, and read the pressure value P1 after the pressure holding is completed. S4. Calculate the pressure drop using the BMU based on the preset threshold P0 and the read pressure value P1. ,like <Preset voltage drop threshold> If inflation is successful; ≥ Inflation failed. S5. Send a second inflation command to the CSC corresponding to the non-compliant battery pack through the BMU, and repeat the inflation operation in step S2 and the pressure holding and judgment operations in steps S3 and S4; if all battery packs are successfully inflated, the process ends; if not, proceed to step S6. S6. Divide the battery packs that failed to inflate into two groups. Perform inflation, pressure holding, and judgment operations on each group and record the success and failure numbers. If there are any failed battery packs, regroup, re-inflate, pressure holding, and judgment processes until all battery packs are inflated or it is confirmed that they cannot be inflated and the fault is reported.

[0005] In some embodiments, the battery system further includes a pressure-sensing solenoid valve and a flow-limiting valve. The pressure-sensing solenoid valve is controlled by the BMU and is used to detect the airtightness of the gas storage tank and the inert gas pipeline. The flow-limiting valve is used to control the charging flow rate of the inert gas.

[0006] In some embodiments, sending inflation commands to all CSCs via the BMU, controlling the opening of the solenoid valves of the corresponding battery packs, and detecting the pressure in real time includes the following steps: S201. Based on the BMU, an inflation command is synchronously sent to the CSC corresponding to all battery packs through the communication link. After receiving the inflation command, each CSC outputs a control signal to drive the solenoid valve of the corresponding battery pack to open, and inert gas flows into the battery pack. S202: Based on the CSC, the pressure data of the battery pack is collected in real time through the built-in pressure sensor and fed back to the BMU; S203. When the CSC detects that the battery pack pressure has reached the preset threshold P0, it sends a pressure compliance feedback signal to the BMU. After receiving the pressure compliance feedback signal, the BMU sends a valve closing command to the corresponding CSC to control the solenoid valve to close. S204. Start inflation timer based on BMU. When the time reaches the preset time T0, stop the timer and summarize the pressure data of all battery packs. If the pressure of all battery packs reaches the preset threshold P0, proceed to step S3. If there are battery packs whose pressure does not reach the preset threshold P0, store their unique numbers through BMU to form a list of substandard battery packs, and proceed to step S5.

[0007] In some embodiments, if step S5 is unsuccessful, the list of non-compliant battery packs is updated based on the BMU before proceeding to step S6.

[0008] In some embodiments, dividing the battery packs that failed to inflate into two groups and performing inflating, pressure holding, and judgment operations on each group separately includes the following steps: S601. Based on the BMU, read the updated list of non-compliant battery packs, count the number of battery packs N, and divide the N battery packs into two groups; where, if N is odd, one group contains N+1 One battery pack, another group containing N-1 One battery pack; S602. Select one of the lists to be inflated, send an inflation command to the CSC corresponding to all battery packs in the group, repeat the inflation operation of step S2 until the pressure of all battery packs in the group reaches the preset threshold P0 or the inflation time reaches T0, and perform the pressure holding and judgment operations of steps S3 and S4 on the group of battery packs, and record the unique number of the battery packs that are successfully inflated and those that fail to inflate in the group. S603. For another list of batteries to be inflated, repeat step S602 and record the unique number of the battery pack that was successfully inflated and that failed to inflate. S604. Summarize the judgment results of the two groups and update the list of substandard battery packs; if the updated list of substandard battery packs is empty, end the process; if it is not empty, repeat steps S601-S603 until the list of substandard battery packs is empty, or after reaching the preset number of charging times, determine the battery packs that failed to inflate as faulty battery packs and end the process.

[0009] In some embodiments, the following steps are included before performing step S2: Select the battery pack charging mode; the battery pack charging mode includes full battery pack charging mode and single battery pack charging mode.

[0010] In some embodiments, the inert gas is one or more of nitrogen, helium, or argon.

[0011] Secondly, embodiments of this application provide a battery safety protection inert gas rapid charging system, including a battery management system (BMS), multiple battery packs, a gas storage tank, an inert gas pipeline, and a solenoid valve. The BMS includes a battery pack main controller (BMU) and multiple battery pack cluster controllers (CSCs). Each battery pack is configured with one CSC to collaboratively implement the steps of the battery safety protection inert gas rapid charging method described in any one of the first aspects.

[0012] Thirdly, this application also provides an electronic device, including: a processor, a memory, and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor communicates with the memory via the bus, and when the machine-readable instructions are executed by the processor, the steps of the battery safety protection inert gas rapid charging method described in any of the second aspects above are performed.

[0013] Fourthly, this application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, performs the steps of the rapid charging method for battery safety protection inert gas described in any one of the first aspects.

[0014] This application describes a method and system for rapid inert gas charging for battery safety protection. It employs a combined strategy of simultaneous charging of all battery packs, secondary charging, and a two-stage charging method. The initial charging completes the filling of most battery packs. For substandard battery packs, secondary charging and the two-stage method are used to quickly locate and complete the charging. Compared to the traditional single-pack sequential charging method, this significantly shortens the overall charging time, avoids energy waste, and improves response speed in emergency scenarios. Furthermore, by directly integrating the inert gas manufacturing, storage, charging, and airtightness detection control functions into the existing Battery Management System (BMS), no additional independent control system hardware and software is required. Compared to traditional external inert gas control systems, this reduces the additional cost per vehicle and the system's footprint. It is compatible with the existing battery system architecture of new energy vehicles, facilitating industrial-scale application. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A flowchart of the rapid inert gas charging method for battery safety protection described in an embodiment of this application is shown; Figure 2 A schematic diagram of the battery system described in an embodiment of this application is shown; Figure 3 The flowchart illustrates the process described in this application, which involves dividing a battery pack that failed to inflate into two groups, performing inflating, pressure holding, and judgment operations on each group. Figure 4 A schematic diagram of the structure of the electronic device described in an embodiment of this application is shown. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the accompanying drawings in this application are for illustrative and descriptive purposes only and are not intended to limit the scope of protection of this application. Furthermore, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of this application. It should be understood that the operations in the flowcharts may not be implemented in sequence, and steps without logical contextual relationships may be reversed or implemented simultaneously. In addition, those skilled in the art, guided by the content of this application, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts.

[0018] Furthermore, the described embodiments are merely some, not all, of the embodiments of this application. The components of the embodiments of this application described and illustrated herein can typically be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0019] It should be noted that the term "comprising" will be used in the embodiments of this application to indicate the presence of the features declared thereafter, but does not exclude the addition of other features.

[0020] In view of the technical problems raised in the background art, this application provides a method and system for rapid charging of battery safety protection inert gas, which can improve the charging efficiency by integrating control functions into the existing battery management system (BMS) and adopting a combination strategy of simultaneous charging of all battery packs, secondary charging, and bi-stage charging.

[0021] See the instruction manual appendix Figure 1 Included with instruction manual Figure 2This application provides a method for rapid inert gas charging for battery safety protection, applied to the battery system of a new energy vehicle. The battery system includes a battery management system (BMS), multiple battery packs, a gas storage tank, inert gas pipelines, solenoid valves, pressure-sensing solenoid valves, and current-limiting valves. The BMS includes a battery pack main controller (BMU) and multiple battery pack cluster controllers (CSCs), with one CSC configured for each battery pack. The method includes the following steps: S1. Perform an airtightness test on the inert gas pipeline and storage tank; if the test result is normal, proceed to step S2; if the test result is abnormal, report the airtightness fault and stop the inflation process. S2. Send inflation commands to all CSCs via BMU, control the opening of the solenoid valve of the corresponding battery pack and monitor the pressure in real time; when the pressure reaches the preset threshold P0, BMU controls the solenoid valve to close; and when the time reaches the preset time T0, determine whether the pressure of all battery packs has reached the preset threshold P0. If they have all reached it, proceed to step S3; otherwise, store the number of the battery pack that did not meet the standard and proceed to step S5. S3. Hold the pressure of the battery pack that has reached the preset threshold P0 for a preset time t1, and read the pressure value P1 after the pressure holding is completed. S4. Calculate the pressure drop using the BMU based on the preset threshold P0 and the read pressure value P1. ,like <Preset voltage drop threshold> If inflation is successful; If the inflation value is greater than or equal to △P, inflation is considered to have failed. S5. Send a second inflation command to the CSC corresponding to the non-compliant battery pack through the BMU, and repeat the inflation operation in step S2 and the pressure holding and judgment operations in steps S3 and S4; if all battery packs are successfully inflated, the process ends; if not, proceed to step S6. S6. Divide the battery packs that failed to inflate into two groups. Perform inflation, pressure holding, and judgment operations on each group and record the success and failure numbers. If there are any failed battery packs, regroup, re-inflate, pressure holding, and judgment processes until all battery packs are inflated or it is confirmed that they cannot be inflated and the fault is reported.

[0022] It should be noted that the battery safety protection inert gas rapid charging method provided in this application is only executed when the charging trigger condition is met, thereby avoiding unnecessary charging operations (such as when the battery system is normal and the inert gas pressure is sufficient), reducing inert gas waste and system wear.

[0023] In one implementation, the battery system status is monitored in real time by the BMS, including the thermal runaway-related parameters of the battery pack (such as individual cell temperature, voltage change rate, gas generation rate, triaxial acceleration) and the current pressure of inert gas in each battery pack; and it is determined whether any of the following charging trigger conditions are met. (1) The battery pack has a risk of thermal runaway: the thermal runaway-related parameters of any battery pack are monitored to reach the preset warning threshold (such as a sudden temperature rise, voltage change); (2) The battery has no risk of thermal runaway but the inert gas pressure is low: the thermal runaway-related parameters of all battery packs have not reached the warning threshold, and the current pressure of at least one battery pack is lower than the set value (generally required to be maintained higher than atmospheric pressure). If any of the above conditions are met, step S1 is entered; if none of them are met, the charging process is not started, and the BMS continues to monitor the battery system status.

[0024] Step S1 mainly involves air tightness testing, which is a safety prerequisite for all inflation processes. Subsequent inflation operations are only initiated when the inert gas pipeline and gas tank are airtight, in order to avoid inflation failure or safety hazards due to gas leakage and to ensure the feasibility of the process from the source.

[0025] In one embodiment, a detection command is sent to the pressure-sensing solenoid valve via the BMU to control the opening of the pressure-sensing solenoid valve and initiate the airtightness detection process of the inert gas pipeline and gas tank. The BMU collects airtightness detection data in real time to determine the airtightness status of the inert gas pipeline and gas tank. If the detection result is that the airtightness is normal, the process proceeds to step S2. If the detection result is that the airtightness is abnormal, an airtightness fault is reported to the vehicle via the vehicle communication bus, and a stop command for the inflation process is triggered, terminating all subsequent operations.

[0026] In step S2, the main approach is to replace the traditional single-box sequential inflation with batch synchronous inflation, thereby maximizing inflation efficiency, shortening the overall inflation time, and meeting the rapid protection requirements in emergency scenarios such as battery thermal runaway.

[0027] It should be noted that this application, in addition to providing a full battery pack charging mode, also retains the traditional single battery pack charging mode. This is because the single battery pack charging mode is mainly for addressing the safety risks or maintenance needs of a specific battery pack, not for emergency scenarios involving thermal runaway of the entire system. For example, if the BMS detects minor signs of impending thermal runaway in a particular battery pack (such as abnormal temperature rise or voltage fluctuations), but this does not trigger system-wide thermal runaway, it is unnecessary to inflate all battery packs (to avoid gas waste and unnecessary costs). Only the abnormal battery pack needs to be inflated individually, using inert gas to suppress the spread of thermal runaway. As another example, after a battery pack has undergone repair, replacement, or airtightness re-inspection, it is necessary to verify the inert gas inflation function of that battery pack individually (such as whether the solenoid valve can open and close normally, and whether the pressure meets the standard). In this case, only the inflation test is performed on that single battery pack, without initiating the entire system process, thus improving maintenance efficiency. Therefore, before executing step S2, the battery pack charging mode needs to be selected as the full battery pack charging mode.

[0028] In one embodiment, the BMU generates a batch inflation command and synchronously sends the inflation command to the corresponding CSC of all battery packs via a communication link. After receiving the inflation command, each CSC outputs a control signal to drive the solenoid valve of the corresponding battery pack to open, and inert gas flows into the battery pack through pipelines and flow limiting valves. The CSC collects the pressure data in the battery pack in real time through its built-in pressure sensor and continuously feeds back the pressure information to the BMU. When the CSC detects that the battery pack pressure reaches the preset threshold P0, it immediately sends a pressure compliance feedback signal to the BMU. After receiving the pressure compliance feedback signal, the BMU sends a valve closing command to the corresponding CSC to control the battery pack solenoid valve to close. The BMU starts an inflation timer. When the time reaches the preset time T0, it stops the timer and summarizes the pressure status of all battery packs. If the pressure of all battery packs reaches the preset threshold P0, the process proceeds to step S3. If there are battery packs whose pressure has not reached P0, the BMU stores the unique number of these battery packs to form a list of non-compliant battery packs and proceeds to step S5.

[0029] The preset threshold P0 and preset time T0 are specifically set based on the safety requirements and structural characteristics of the battery system, and this application does not limit their values. Generally, the preset threshold P0 usually needs to reach a pressure slightly higher than atmospheric pressure. If the pressure is too low, the isolation effect will be insufficient, and if the pressure is too high, it may exceed the pressure bearing capacity of the battery pack casing. The preset time T0 needs to cover the longest time for gas to flow from the gas storage tank into the battery pack through the pipeline. For example, the larger the battery pack volume and the smaller the gas flow rate, the longer T0 needs to be.

[0030] In steps S3 and S4, the main tasks are inflation and pressure holding and inflation success determination. This is because the long-term effectiveness cannot be verified by simply ensuring that the instantaneous pressure meets the standard during inflation, while the pressure holding process can expose potential airtightness problems and provide accurate data support for subsequent determination.

[0031] In one embodiment, the BMU sends a pressure-holding command to the CSC corresponding to the battery pack that meets the pressure standard, initiating the pressure-holding process. The pressure is maintained for a preset holding time T1, during which the solenoid valves of the battery pack remain closed to prevent gas inflow or outflow. After the holding time reaches T1, the CSC again collects the pressure value P1 within the battery pack and feeds the P1 data back to the BMU. Then, the BMU calculates the actual pressure drop during the pressure-holding period based on the P0 and P1 data for each compliant battery pack. ; to the actual pressure drop Actual voltage drop threshold Compare; if <Preset voltage drop threshold> If the battery pack is successfully inflated, the inert gas protection process for the battery pack is completed; if... ≥ If the battery pack fails to inflate, its unique number is stored, and the list of non-compliant battery packs is updated.

[0032] This inflation and pressure holding operation verifies the sealing and pressure stability of the battery pack after inflation, preventing a rapid drop in pressure after inflation due to airtight defects in the battery pack itself (such as loose interfaces or micro-leakage in the casing), and ensuring that the inert gas can remain in the battery pack for a long time to play a continuous protective role.

[0033] The pressure holding time T1 is determined comprehensively based on the battery pack's sealing characteristics, gas stability characteristics, and actual application scenarios; a preset pressure drop threshold is also included. The minimum pressure setting is based on the sealing characteristics and protection effectiveness of the battery pack; this application does not limit its value.

[0034] In step S5, secondary inflation is mainly performed. For battery packs that did not meet the standards during the first batch inflation, targeted supplementary inflation is carried out to solve the problems caused by reversible issues such as insufficient inflation time and instantaneous pressure fluctuations, thereby improving the overall inflation success rate and reducing the number of faulty battery packs.

[0035] In one embodiment, the BMU reads the list of substandard battery packs and sends a secondary inflation command to the CSC corresponding to all battery packs in the list. After receiving the secondary inflation command, the CSC controls the opening of the solenoid valve of the corresponding battery pack, collects the battery pack pressure in real time, and feeds it back to the BMU. When the battery pack pressure reaches a preset threshold P0, the BMU controls the corresponding solenoid valve to close. The battery packs are subjected to a pressure holding process for a duration of T1 according to the process of step S3, and the pressure value is obtained after the pressure holding is completed. According to the judgment criteria of step S, the BMU determines whether the secondary inflation of each battery pack is successful. If the secondary inflation is successful, the process of the battery pack is completed. If there are still battery packs that fail to inflate, the BMU updates the list of substandard battery packs and proceeds to step S6.

[0036] In step S6, the main process is to perform a two-stage inflation method. For battery packs that still fail to meet the standard after two inflations, the source of the fault is quickly located by grouping and verifying each group. This ensures that all battery packs are fully inflated and avoids the time-consuming problem of inflating each pack individually. At the same time, it accurately identifies battery packs with irreversible faults.

[0037] See the instruction manual appendix Figure 3 In one embodiment, the process of dividing the failed battery packs into two groups and performing inflating, pressure holding, and judgment operations on each group includes the following steps: S601. Based on the BMU, read the updated list of non-compliant battery packs, count the number of battery packs N, and divide the N battery packs into two groups; where, if N is odd, one group contains N+1 One battery pack, another group containing N-1 One battery pack; S602. Select one of the lists to be inflated, send an inflation command to the CSC corresponding to all battery packs in the group, repeat the inflation operation of step S2 until the pressure of all battery packs in the group reaches the preset threshold P0 or the inflation time reaches T0, and perform the pressure holding and judgment operations of steps S3 and S4 on the group of battery packs, and record the unique number of the battery packs that are successfully inflated and those that fail to inflate in the group. S603. For another list of batteries to be inflated, repeat step S602 and record the unique number of the battery pack that was successfully inflated and that failed to inflate. S604. Summarize the judgment results of the two groups and update the list of substandard battery packs; if the updated list of substandard battery packs is empty, end the process; if it is not empty, repeat steps S601-S603 until the list of substandard battery packs is empty, or after reaching the preset number of charging times, determine the battery packs that failed to inflate as faulty battery packs and end the process.

[0038] This application provides a method for rapid inert gas filling for battery safety protection. On one hand, it employs a combined strategy of simultaneous filling of all battery packs, secondary filling, and a two-stage filling method. The initial filling completes the filling of most battery packs. For substandard battery packs, secondary filling and the two-stage method are used to quickly locate and complete the filling. Compared to the traditional method of filling a single pack sequentially, this significantly shortens the overall filling time, avoids energy waste, and improves response speed in emergency scenarios. On the other hand, by fine-tuning the control circuit in the existing Battery Management System (BMS), the control functions of inert gas manufacturing, storage, filling, and airtightness detection are directly integrated. No additional independent control system hardware and software are required. Compared to traditional external inert gas control systems, this reduces the additional cost per vehicle and the system's footprint. It is compatible with the existing battery system architecture of new energy vehicles, requires no large-scale structural modifications to the battery pack, has good compatibility, and is easy to promote and apply industrially.

[0039] Based on the same inventive concept, this application also provides a battery safety protection inert gas rapid charging system, including a battery management system (BMS), multiple battery packs, a gas storage tank, inert gas pipelines, and solenoid valves. The BMS includes a battery pack main controller (BMU) and multiple battery pack cluster controllers (CSCs), with one CSC configured for each battery pack to collaboratively implement the steps of the battery safety protection inert gas rapid charging method described above. Since the principle of the system in this application embodiment is similar to the battery safety protection inert gas rapid charging method described above, the implementation of the system can refer to the implementation of the method, and repeated details will not be elaborated further.

[0040] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0041] Based on the same concept of the present invention, as shown in the appendix to the specification. Figure 4 As shown in the figure, an embodiment of this application provides the structure of an electronic device 400, which includes: at least one processor 401, at least one network interface 404 or other user interface 403, memory 405, and at least one communication bus 402. The communication bus 402 is used to realize the connection and communication between these components. The electronic device 400 may optionally include a user interface 403, including a display (e.g., touch screen, LCD, CRT, holographic imaging, or projector, etc.), a keyboard, or a clicking device (e.g., mouse, trackball, touchpad, or touch screen, etc.).

[0042] Memory 405 may include read-only memory and random access memory, and provides instructions and data to processor 401. A portion of memory 405 may also include non-volatile random access memory (NVRAM).

[0043] In some implementations, memory 405 stores executable modules or data structures, or subsets thereof, or extended sets thereof: The 4051 operating system contains various system programs used to implement various basic business functions and handle hardware-based tasks. Application module 4052 contains various applications, such as desktop (launcher), media player (MediaPlayer), browser (Browser), etc., to implement various application services.

[0044] In this embodiment of the application, the processor 401 executes steps such as a method for rapidly charging an inert gas for battery safety protection by calling a program or instruction stored in the memory 405.

[0045] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, performs steps such as those in a method for rapidly charging an inert gas for battery safety protection.

[0046] Specifically, the storage medium can be a general-purpose storage medium, such as a portable disk or hard disk. When the computer program on the storage medium is run, it can improve the charging efficiency by integrating control functions into the existing battery management system (BMS) and adopting a combination strategy of simultaneous charging of all battery packs, secondary charging, and bi-category charging.

[0047] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and there may be other division methods in actual implementation. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the mutual coupling or direct coupling or communication connection shown or discussed may be through some communication interface, and the indirect coupling or communication connection of the apparatus or units may be electrical, mechanical, or other forms.

[0048] 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.

[0049] In addition, the functional units in the embodiments provided in this application 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.

[0050] 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 application, in essence, 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 application. 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.

[0051] Finally, it should be noted that the above embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application. All should be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A method for rapidly filling a battery with an inert gas for safety protection, characterized in that, A battery system for new energy vehicles, comprising a battery management system (BMS), multiple battery packs, a gas storage tank, inert gas pipelines, and solenoid valves, wherein the BMS includes a battery pack main controller (BMU) and multiple battery pack cluster controllers (CSCs), with one CSC configured for each battery pack, characterized in that the method includes the following steps: S1. Perform an airtightness test on the inert gas pipeline and storage tank; if the test result is normal, proceed to step S2; if the test result is abnormal, report the airtightness fault and stop the inflation process. S2. Send inflation commands to all CSCs via BMU, control the opening of the solenoid valve of the corresponding battery pack and monitor the pressure in real time; when the pressure reaches the preset threshold P0, BMU controls the solenoid valve to close; and when the time reaches the preset time T0, determine whether the pressure of all battery packs has reached the preset threshold P0. If they have all reached it, proceed to step S3; otherwise, store the number of the battery pack that did not meet the standard and proceed to step S5. S3. Hold the pressure of the battery pack that has reached the preset threshold P0 for a preset time t1, and read the pressure value P1 after the pressure holding is completed. S4. Calculate the pressure drop using the BMU based on the preset threshold P0 and the read pressure value P1. ,like <Preset voltage drop threshold> If inflation is successful; ≥ Inflation failed. S5. Send a second inflation command to the CSC corresponding to the non-compliant battery pack through the BMU, and repeat the inflation operation in step S2 and the pressure holding and judgment operations in steps S3 and S4; if all battery packs are successfully inflated, the process ends; if not, proceed to step S6. S6. Divide the battery packs that failed to inflate into two groups. Perform inflation, pressure holding, and judgment operations on each group and record the success and failure numbers. If there are any failed battery packs, regroup, re-inflate, pressure holding, and judgment processes until all battery packs are inflated or it is confirmed that they cannot be inflated and the fault is reported.

2. The method for rapid charging of battery safety protection inert gas according to claim 1, characterized in that, The battery system also includes a pressure-sensing solenoid valve and a flow-limiting valve. The pressure-sensing solenoid valve is controlled by the BMU and is used to detect the airtightness of the gas storage tank and the inert gas pipeline. The flow-limiting valve is used to control the charging flow rate of the inert gas.

3. The method for rapid charging of battery safety protection inert gas according to claim 1, characterized in that, The process of sending inflation commands to all CSCs via the BMU, controlling the opening of the solenoid valves of the corresponding battery packs, and monitoring the pressure in real time includes the following steps: S201. Based on the BMU, an inflation command is synchronously sent to the CSC corresponding to all battery packs through the communication link. After receiving the inflation command, each CSC outputs a control signal to drive the solenoid valve of the corresponding battery pack to open, and inert gas flows into the battery pack. S202: Based on the CSC, the pressure data of the battery pack is collected in real time through the built-in pressure sensor and fed back to the BMU; S203. When the CSC detects that the battery pack pressure has reached the preset threshold P0, it sends a pressure compliance feedback signal to the BMU. After receiving the pressure compliance feedback signal, the BMU sends a valve closing command to the corresponding CSC to control the solenoid valve to close. S204. Start inflation timer based on BMU. When the time reaches the preset time T0, stop the timer and summarize the pressure data of all battery packs. If the pressure of all battery packs reaches the preset threshold P0, proceed to step S3. If there are battery packs whose pressure does not reach the preset threshold P0, store their unique numbers through BMU to form a list of substandard battery packs, and proceed to step S5.

4. The method for rapid charging of battery safety protection inert gas according to claim 3, characterized in that, If step S5 is unsuccessful, the list of non-compliant battery packs is updated based on the BMU before proceeding to step S6.

5. The method for rapid charging of battery safety protection inert gas according to claim 4, characterized in that, The process of dividing the failed inflating battery packs into two groups and performing inflating, pressure maintaining, and judgment operations on each group includes the following steps: S601. Based on the BMU, read the updated list of non-compliant battery packs, count the number of battery packs N, and divide the N battery packs into two groups; where, if N is odd, one group contains N+1 One battery pack, another group containing N-1 One battery pack; S602. Select one of the lists to be inflated, send an inflation command to the CSC corresponding to all battery packs in the group, repeat the inflation operation of step S2 until the pressure of all battery packs in the group reaches the preset threshold P0 or the inflation time reaches T0, and perform the pressure holding and judgment operations of steps S3 and S4 on the group of battery packs, and record the unique number of the battery packs that are successfully inflated and those that fail to inflate in the group. S603. For another list of batteries to be inflated, repeat step S602 and record the unique number of the battery pack that was successfully inflated and that failed to inflate. S604. Summarize the judgment results of the two groups and update the list of substandard battery packs; if the updated list of substandard battery packs is empty, end the process; if it is not empty, repeat steps S601-S603 until the list of substandard battery packs is empty, or after reaching the preset number of charging times, determine the battery packs that failed to inflate as faulty battery packs and end the process.

6. The method for rapid charging of battery safety protection inert gas according to claim 1, characterized in that, Before performing step S2, the following steps are also included: Select the battery pack charging mode; the battery pack charging mode includes full battery pack charging mode and single battery pack charging mode.

7. The method for rapid charging of battery safety protection inert gas according to claim 1, characterized in that, in, The inert gas is one or more of nitrogen, helium, or argon.

8. A battery system for a new energy vehicle, characterized in that, The system includes a battery management system (BMS), multiple battery packs, a gas storage tank, inert gas pipelines, and solenoid valves. The BMS includes a battery pack master controller (BMU) and multiple battery pack cluster controllers (CSCs). Each battery pack is configured with one CSC to collaboratively implement the steps of the rapid inert gas charging method for battery safety protection as described in any one of claims 1 to 7.

9. An electronic device, characterized in that, include: The device includes a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the memory via the bus. When the machine-readable instructions are executed by the processor, they perform the steps of a rapid inert gas charging method for battery safety protection as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, performs the steps of a rapid inert gas charging method for battery safety protection as described in any one of claims 1 to 7.

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