CN-122025873-A - Method and system for rapidly inflating battery safety protection inert gas

CN122025873ACN 122025873 ACN122025873 ACN 122025873ACN-122025873-A

Abstract

The application provides a method and a system for rapidly inflating a battery safety protection inert gas, which relate to the technical field of battery safety of new energy automobiles, and adopt a combined strategy of simultaneous inflation, secondary inflation and dichotomy inflation of all battery packs, and can complete filling of most battery packs by primary inflation, and rapidly position and complete inflation by secondary inflation and dichotomy aiming at the battery packs which do not reach the standard, compared with a traditional single-box successive inflation mode, the method and the system greatly shorten the overall inflation time, avoid energy waste and promote the response speed under an emergency scene. And through directly integrating the control functions of inert gas manufacture, storage, inflation, airtight detection and the like in the existing battery management system BMS, the independent control system software and hardware are not required to be additionally configured, and compared with the traditional external inert gas control system, the additional cost of a bicycle can be reduced, and meanwhile, the occupied space of the system is reduced. The battery system architecture of the existing new energy vehicle is adapted, and the industrialized popularization and application are facilitated.

Inventors

WANG KUN
ZHOU SHIGUO
TONG YONGJUN
ZHANG HONGTAO
HU DAHAI

Assignees

郑州深澜动力科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260203

Claims (10)

1. A battery safety protection inert gas rapid charging method, characterized in that the battery system is applied to a new energy vehicle, the battery system comprises a battery management system BMS, a plurality of battery packs, a gas storage tank, an inert gas pipeline and an electromagnetic valve, the BMS comprises a battery pack master BMU and a plurality of battery pack cluster controllers CSC, each battery pack is correspondingly provided with one CSC, and the method comprises the following steps: S1, detecting the air tightness of an inert gas pipeline and an air storage tank, wherein if the detection result is that the air tightness is normal, the step S2 is entered, if the detection result is that the air tightness is abnormal, an air tightness fault is reported, and the air charging process is stopped; S2, sending an inflation instruction to all CSCs through the BMU, controlling the solenoid valves of the corresponding battery packs to be opened and detecting the pressure in real time, wherein when the pressure reaches a preset threshold value P0, the BMU controls the solenoid valves to be closed, and when the duration reaches a preset time T0, judging whether the pressure of all the battery packs reaches the preset threshold value P0, if so, entering a step S3, otherwise, storing the numbers of the battery packs which do not reach the standard, and entering a step S5; s3, maintaining the pressure of the battery pack with the pressure reaching a preset threshold value P0 according to a preset time t1, and reading a pressure value P1 after the pressure maintaining is finished; s4, calculating the pressure drop through the BMU according to the preset threshold value P0 and the read pressure value P1 If (if) < Preset pressure drop threshold Judging the success of the inflation, if ≥ Judging that the inflation fails; S5, sending a secondary inflation instruction to the CSC corresponding to the battery pack which does not reach the standard through the BMU, and repeating the inflation operation of the step S2 and the pressure maintaining and judging operations of the steps S3 and S4, wherein if all the battery packs are successfully inflated, the flow is ended, and if the battery packs are not successfully inflated, the step S6 is entered; s6, dividing the battery packs which fail to be inflated into two groups, respectively carrying out the operations of gas filling, pressure maintaining and judging on each group of the battery packs, recording success and failure numbers, and if the battery packs fail, regrouping, gas filling, pressure maintaining and judging processes are carried out until all the battery packs complete gas filling or confirm that the battery packs cannot be inflated and report faults.
2. The method for rapidly charging the inert gas for the safety protection of the battery according to claim 1, wherein the battery system further comprises a pressure detection electromagnetic valve and a flow limiting valve, the pressure detection electromagnetic valve is controlled by the BMU and used for detecting the air tightness of the air storage tank and the inert gas pipeline, and the flow limiting valve is used for controlling the charging flow of the inert gas.
3. The method for rapid inflation of a battery safety protection inert gas according to claim 1, wherein the step of sending inflation instructions to all CSCs through the BMU, controlling solenoid valves of corresponding battery packs to open and detecting pressure in real time comprises the steps of: S201, synchronously sending inflation instructions to the CSCs corresponding to all the battery packs through a communication link based on the BMU, and outputting control signals to drive electromagnetic valves of the corresponding battery packs to open after each CSC receives the inflation instructions, so that inert gas flows into the battery packs; s202, acquiring pressure data of a battery pack in real time through a built-in pressure sensor based on a CSC (physical measurement Unit), and feeding back the pressure data to a BMU; S203, when the CSC detects that the pressure of the battery pack reaches a preset threshold value P0, sending a pressure standard feedback signal to the BMU, and after the BMU receives the pressure standard feedback signal, sending a valve closing instruction to the corresponding CSC to control the electromagnetic valve to be closed; S204, starting the timing of the inflation time based on the BMU, stopping timing and summarizing pressure data of all battery packs when the inflation time reaches a preset time T0, entering a step S3 if the pressure of all battery packs reaches a preset threshold value P0, and entering a step S5 if the pressure of all battery packs does not reach the preset threshold value P0, storing unique numbers of the battery packs through the BMU, so as to form a battery pack list which does not reach the standard.
4. The rapid battery safety protection inert gas charging method according to claim 3, wherein in step S5, if not successful, the step proceeds to step S6 after updating the list of unqualified battery packs based on the BMU.
5. The method for rapid inflation of a battery safety protection inert gas according to claim 4, wherein the battery pack failing to be inflated is divided into two groups, and each group of the operations of the memory inflation, the pressure maintaining and the judgment are respectively performed, comprising the steps of: S601, based on the BMU, reading an updated substandard battery pack list, counting the number N of battery packs, and equally dividing the N battery packs into two groups, wherein if N is an odd number, one group comprises N+1 Each battery pack, another group comprising N-1 A battery pack; S602, selecting one group of lists to be inflated, sending inflation instructions to CSC corresponding to all battery packs in the group, repeating the inflation operation of step S2 until the pressure of all battery packs in the group reaches a preset threshold value P0 or the inflation time length reaches T0, executing the pressure maintaining and judging operations of step S3 and step S4 on the battery packs in the group, and recording the unique numbers of the battery packs which are successfully and unsuccessfully inflated in the group; s603, repeating the step S602 for another group of to-be-inflated lists, and recording the unique numbers of the battery packs with successful and failed inflation; S604, summarizing the judging results of the two groups, updating a non-standard battery pack list, wherein if the updated non-standard battery pack list is empty, ending the flow, and if the updated non-standard battery pack list is not empty, repeating the steps S601-S603 until the non-standard battery pack list is empty, or judging a battery pack which fails to be inflated as a fault battery pack after the preset charging times are reached, and ending the flow.
6. The method for rapid inflation of a battery safety protection inert gas according to claim 1, further comprising the steps of, before performing step S2: And selecting a battery pack charging mode, wherein the battery pack charging mode comprises a full battery pack charging mode and a single battery pack charging mode.
7. The method for rapid inflation of a battery safety protection inert gas according to claim 1, wherein the inert gas is one or more mixed gases of nitrogen, helium or argon.
8. A battery system of a new energy vehicle, characterized by comprising a battery management system BMS, a plurality of battery packs, a gas storage tank, an inert gas pipeline and an electromagnetic valve, wherein the BMS comprises a battery pack main controller BMU and a plurality of battery pack cluster controllers CSC, and each battery pack is correspondingly provided with one CSC for cooperatively realizing the steps of the battery safety protection inert gas rapid charging method according to any one of claims 1 to 7.
9. An electronic device comprising a processor, a memory and a bus, the memory storing machine-readable instructions executable by the processor, the processor in communication with the memory via the bus when the electronic device is in operation, the machine-readable instructions when executed by the processor performing the steps of a battery safe inert gas rapid fill method according to any of claims 1 to 7.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, performs the steps of a battery safety protection inert gas rapid charging method according to any one of claims 1 to 7.

Description

Method and system for rapidly inflating battery safety protection inert gas Technical Field The application relates to the technical field of battery safety of new energy automobiles, in particular to a method and a system for rapidly inflating inert gas for battery safety protection. Background With the continuous improvement of the permeability of new energy automobiles, the safety problem of the batteries is increasingly remarkable, and the accident of ignition and explosion caused by the thermal runaway of the batteries frequently occurs every year, thereby seriously threatening the life safety of drivers and passengers. To cope with this problem, various technical solutions have appeared in the industry, but all have obvious drawbacks: The battery system and the whole vehicle are manufactured by adopting an external fire extinguishing system, when the batteries are out of control, the fire extinguishing action is started to reduce personnel damage, but the system needs to be additionally provided with an independent controller, a fire extinguishing agent storage device and the like, so that the cost of the single vehicle is increased by 1-2 ten thousand yuan, the manufacturing cost of the battery system and the whole vehicle is obviously improved. Disclosure of Invention In view of the above, the present application aims to provide a method and a system for rapidly inflating a battery safety protection inert gas, which can improve the inflation efficiency by integrating a control function in an existing battery management system BMS and adopting a combined strategy of simultaneously inflating all battery packs, secondarily inflating and bisecting inflating. In a first aspect, an embodiment of the present application provides a method for rapidly charging a battery with safety protection inert gas, which is applied to a battery system of a new energy vehicle, the battery system includes a battery management system BMS, a plurality of battery packs, a gas storage tank, an inert gas pipeline and an electromagnetic valve, the BMS includes a battery pack master BMU and a plurality of battery pack cluster controllers CSC, each battery pack is correspondingly configured with one CSC, the method includes the following steps: S1, detecting the air tightness of an inert gas pipeline and an air storage tank, wherein if the detection result is that the air tightness is normal, the step S2 is entered, if the detection result is that the air tightness is abnormal, an air tightness fault is reported, and the air charging process is stopped; S2, sending an inflation instruction to all CSCs through the BMU, controlling the solenoid valves of the corresponding battery packs to be opened and detecting the pressure in real time, wherein when the pressure reaches a preset threshold value P0, the BMU controls the solenoid valves to be closed, and when the duration reaches a preset time T0, judging whether the pressure of all the battery packs reaches the preset threshold value P0, if so, entering a step S3, otherwise, storing the numbers of the battery packs which do not reach the standard, and entering a step S5; s3, maintaining the pressure of the battery pack with the pressure reaching a preset threshold value P0 according to a preset time t1, and reading a pressure value P1 after the pressure maintaining is finished; s4, calculating the pressure drop through the BMU according to the preset threshold value P0 and the read pressure value P1 If (if)< Preset pressure drop thresholdJudging the success of the inflation, if≥Judging that the inflation fails; S5, sending a secondary inflation instruction to the CSC corresponding to the battery pack which does not reach the standard through the BMU, and repeating the inflation operation of the step S2 and the pressure maintaining and judging operations of the steps S3 and S4, wherein if all the battery packs are successfully inflated, the flow is ended, and if the battery packs are not successfully inflated, the step S6 is entered; s6, dividing the battery packs which fail to be inflated into two groups, respectively carrying out the operations of gas filling, pressure maintaining and judging on each group of the battery packs, recording success and failure numbers, and if the battery packs fail, regrouping, gas filling, pressure maintaining and judging processes are carried out until all the battery packs complete gas filling or confirm that the battery packs cannot be inflated and report faults. In some embodiments, the battery system further comprises a pressure detection electromagnetic valve and a flow limiting valve, wherein the pressure detection electromagnetic valve is controlled by the BMU and is used for detecting the tightness of the gas storage tank and the inert gas pipeline, and the flow limiting valve is used for controlling the charging flow of the inert gas. In some embodiments, the sending, by the BMU, a charging instruction to all CSCs, controlling solenoid va