CN112026523B - Battery pack sealing performance detection system and electric vehicle - Google Patents
Battery pack sealing performance detection system and electric vehicle Download PDFInfo
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- CN112026523B CN112026523B CN202010898883.8A CN202010898883A CN112026523B CN 112026523 B CN112026523 B CN 112026523B CN 202010898883 A CN202010898883 A CN 202010898883A CN 112026523 B CN112026523 B CN 112026523B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4228—Leak testing of cells or batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/488—Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention belongs to the field of power batteries, and discloses a battery pack tightness detection system and an electric vehicle, wherein the battery pack tightness detection system comprises an airflow generation device, a gas flow sensor, an alarm device and a controller; the air flow generating device is connected to a sealing detection interface of the battery pack through a sealing detection pipe and is suitable for generating air flow according to preset air pressure; the gas flow sensor is arranged in the sealing detection interface, and the signal output end of the gas flow sensor is electrically connected to one input port of the controller; the signal input end of the alarm device is electrically connected to one output port of the controller; the controller is pre-stored with a mapping table of preset air pressure and air flow, and is suitable for comparing the detected value Q1 of the air flow sensor with the pre-stored value Q0 of the air flow in the mapping table, if Q1 is greater than Q0, an alarm signal is output to the alarm device, and the alarm device starts alarm according to the alarm signal. The invention can detect the sealing performance of the battery pack in real time and improve the use safety of the battery pack.
Description
Technical Field
The invention belongs to the field of power batteries, and particularly relates to a battery pack tightness detection system and an electric vehicle.
Background
At present, traditional fuel automobile is being gradually replaced by new energy automobile, and many traditional fuel automobile platforms are direct through changing the engine structure into power battery package structure, change the automobile power source by the fuel into the battery. The lightweight of the battery pack is related to the energy density of the battery pack, and further is related to the improvement space of the continuous mileage of the whole vehicle.
In order to reduce the weight of the battery pack, the wall thickness of the shell is correspondingly reduced while the weight of the battery pack is reduced. To the arrangement form that most power battery package is located whole car floor below, because the road surface often has the great foreign matter of deceleration strip and the equidistance of stone, electric vehicle is in the driving process, and the condition that these road surface foreign matter can take place the battery package bottom plate of vehicle bottom of inevitable, and takes place the probability higher. The bottom impact of the road foreign matter has serious harm to the battery pack, and can cause deformation and even breakage of a shell at the bottom of the battery pack, damage of a sealing strip, damage of an explosion-proof valve, loosening of a shell fixing bolt and the like, so that the whole pack is sealed and loses efficacy. However, the sealing failure may not affect the normal running of the vehicle temporarily, and the driver cannot know that the sealing of the battery pack is failed, if the driver cannot remind the driver in time, when the vehicle wades, the battery pack has a high probability of water inflow, and after the water inflow of the battery pack, the internal short circuit, fire or even explosion of the whole pack may be caused, so that the potential safety hazard is high.
Disclosure of Invention
The invention aims to provide a battery pack tightness detection system, which is characterized in that airflow with preset air pressure is generated in a battery pack, the gas flow of the airflow is detected in real time, if the actually measured gas flow is larger than the standard gas flow calibrated in a sealed state, the existence of a gas leakage point in the battery pack is judged, and at the moment, an alarm is started to remind a driver to take preventive measures in time, so that the use safety of the battery pack is improved.
In order to achieve the above object, in a first aspect, the present invention provides a battery pack sealability detection system comprising an air flow generation device, an air flow sensor, an alarm device and a controller; the air flow generating device is connected to a sealing detection interface of the battery pack through a sealing detection pipe and is suitable for generating air flow according to preset air pressure; the gas flow sensor is arranged in the sealing detection interface, and the signal output end of the gas flow sensor is electrically connected to one input port of the controller; the signal input end of the alarm device is electrically connected to one output port of the controller; the controller is internally pre-stored with a mapping table of the preset air pressure and the preset air flow, and is suitable for comparing a detection value Q1 of the air flow sensor with a pre-stored value Q0 of the air flow in the mapping table, if Q1 is greater than Q0, an alarm signal is output to the alarm device, and meanwhile, the alarm device starts alarm according to the alarm signal.
Further, the device also comprises an acceleration sensor, wherein a signal output end of the acceleration sensor is connected to the other input port of the controller; the start-stop control end of the air flow generating device is electrically connected to the other output port of the controller; the controller is internally prestored with an acceleration preset value a0, and is suitable for comparing a detection value a1 of the acceleration sensor with a0, if a1 is greater than a0, the controller starts the air flow generating device, collects a detection value Q1 of the air flow sensor, compares the detection value Q1 with Q0, and if Q1 is greater than Q0, outputs an alarm signal to the alarm device and starts an alarm at the same time.
Further, the air flow generating device is suitable for absorbing air from the battery pack according to preset air pressure to generate negative pressure air flow; or the air flow generating device is suitable for inflating the battery pack according to preset air pressure to generate positive pressure air flow.
Further, the airflow generating device is a vehicle-mounted air conditioner or an air pump.
Further, an air pressure regulating valve is connected between the air flow generating device and the sealing detection pipe.
Furthermore, an air filtering membrane is arranged in the sealing detection interface, and air flow is filtered by the air filtering membrane and then circulates between the air flow generating device and the battery pack.
Further, the controller is integrated with a battery management system of the battery pack.
Further, when the alarm device starts alarming, the alarm device is suitable for displaying the battery pack sealing failure warning information on the central control screen and/or the vehicle away from the water pit reminding information, and is suitable for emitting the warning information by using lamplight and/or sound.
In a second aspect, the invention provides a power battery pack, which includes the battery pack sealing performance detection system according to any one of the first aspect.
Furthermore, the device also comprises a speed limiting unit, wherein the speed limiting unit is electrically connected to a controller of the battery pack tightness detection system; when the battery pack sealing detection system gives an alarm, the controller is suitable for controlling the speed limiting unit to limit the running speed of the vehicle within a preset vehicle speed range
According to the invention, the airflow with the preset air pressure is generated in the battery pack, the gas flow of the airflow is detected in real time, if the actually measured gas flow is larger than the standard gas flow calibrated in a sealed state, the existence of a gas leakage point in the battery pack is judged, and at the moment, an alarm is started to remind a driver to take preventive measures in time, so that the use safety of the battery pack is improved.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
Fig. 1 is a schematic block diagram of a first embodiment of a battery pack leak detection system of the present invention;
fig. 2 is a schematic block diagram of a second embodiment of a battery pack leak detection system of the present invention;
fig. 3 is a schematic block diagram of a third embodiment of a battery pack sealability detection system of the present invention;
FIG. 4 is a functional block diagram of one embodiment of an electric vehicle of the present invention;
FIG. 5 is a functional block diagram of another embodiment of the electric vehicle of the present invention;
fig. 6 is a flowchart illustrating the operation of one embodiment of the system for detecting the sealability of a battery pack according to the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
It should be noted that in the following description of the technical solutions of the present invention, the terms of orientation or positional relationship are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
As shown in fig. 1 and 5, one embodiment of the system for detecting the sealability of a battery pack according to the present invention comprises a gas flow generating device, a gas flow sensor, an alarm device and a controller; the air flow generating device is connected to a sealing detection interface of the battery pack through a sealing detection pipe and is suitable for generating air flow according to preset air pressure; the gas flow sensor is arranged in the sealing detection interface, and the signal output end of the gas flow sensor is electrically connected to one input port of the controller; the signal input end of the alarm device is electrically connected to one output port of the controller; the controller is internally pre-stored with a mapping table of the preset air pressure and the preset air flow, and is suitable for comparing a detection value Q1 of the air flow sensor with a pre-stored value Q0 of the air flow in the mapping table, if Q1 is greater than Q0, an alarm signal is output to the alarm device, and meanwhile, the alarm device starts alarm according to the alarm signal. It should be noted that the detection value Q1 is a uniform value after the flow rate of the air flow tends to be stable. The arrangement position and the number of the sealed detection interfaces on the battery pack are not limited, when a plurality of sealed detection interfaces exist, any sealed detection interface can be adopted for detection, each sealed detection interface can also be adopted for detection in turn, the electromagnetic valve is arranged at each sealed detection interface and used for switching on/off the gas passage of each sealed detection interface, and when the sealed detection interfaces need to be detected, the electromagnetic valve corresponding to the sealed detection interface is opened through the controller to switch on the gas passage. The mode that a plurality of sealed detection interfaces detected in turn can further improve the accuracy that the leakproofness detected, and the leakproofness of battery package is synthesized to the testing result of each sealed detection interface of accessible.
It should be noted that, as shown in fig. 2, a manual detection switch may be provided, and the manual detection switch is electrically connected to an input port of the controller to obtain an on/off signal of the manual detection switch in real time. The gas generating device is electrically connected to one output port of the controller, when the manual detection switch is closed, the controller receives a state signal of the closed switch, and then outputs a starting instruction to the gas flow generating device to trigger the gas flow generating device to start working according to the preset gas pressure to generate gas flow in the battery pack, and the detection work of the sealing performance of the battery pack is started. Therefore, a driver can start the tightness detection of the battery pack by operating the manual detection switch at any time so as to grasp the sealing state of the battery pack at any time. Especially, when the electric vehicle is started, the manual detection switch can be closed to perform one-time sealing detection on the battery pack, so that the electric vehicle is ensured to run on the road without potential safety hazards. Of course, the controller can also automatically trigger the tightness detection process of the battery pack by acquiring the starting signal of the electric vehicle in real time, so that the tightness of the battery pack can be automatically detected when the electric vehicle is started each time, potential safety hazards possibly existing in the battery pack can be detected before driving, and driving danger caused by the problem of sealing failure of the battery pack is thoroughly avoided.
In the above embodiment, a sealing detection interface is additionally arranged on the battery pack case, the gas flow sensor is arranged in the sealing detection interface, and the gas flow generating device is connected with the sealing detection interface through the sealing detection pipe. The controller is internally pre-stored with a mapping table of the preset air pressure and the gas flow, and the gas flow data in the table is obtained by testing and calibrating under the condition that the battery pack is sealed completely. The explosion-proof valve is used as a part for balancing air pressure between the battery pack and the outside, has a ventilation function, can ventilate at a certain speed when not being opened normally, and can prevent water from entering the battery pack. And during calibration, the ventilation rate of the explosion-proof valve under the selected airtight detection pressure condition is used as a reference, and meanwhile, the calibration is combined with a battery pack sealing detection standard, if the calibration result is that Q0 is 5ml/s, when the gas flow Q1 actually measured by the gas flow sensor is below 5ml/s, the sealing performance of the battery pack is judged to be qualified. Specifically, the actual gas flow of the battery pack varies at different inflation pressures, and the greater the inflation pressure, the greater the gas flow. The vent rate of the vent valve is also related to the inflation pressure, and generally the greater the pressure, the greater the vent rate, e.g., 4ml/s at an inflation pressure of 5 kpa. The air tightness detection standard in the production process of the battery pack is that under the inflation pressure of 5kpa, if the leakage rate is less than 1ml/s within 1min, the battery pack can be judged to be well sealed. The main engine plant can also carry out immersion test on the battery pack with gas leakage, if no water leakage exists, the qualification rate is generally high, so the air tightness test standard can be used, namely, the air permeability rate of the explosion-proof valve is 4ml/s plus the maximum leakage rate is 1ml/s under the inflation pressure of 5kpa, namely, 5ml/s is used as the test standard of the sealing performance of the battery pack in the driving process.
When a gas leakage point occurs in the battery pack, the gas flow resistance is reduced and the gas flow rate is increased under the same suction pressure. When sealing has a problem, the number of leak points is increased, so when the sealing fails, the gas flow is larger than that when the sealing is good.
Different preset air pressure values P0 correspond to different gas flow pre-stored values Q0, and multiple groups of P0 and Q0 form a one-to-one mapping table which is stored in a memory in the controller in advance. When the air flow generating device is started, air flow can be generated in the battery pack by using a preset air pressure value P0 in the mapping table, the specific value of P0 corresponds to the specification of the battery pack, and for the battery pack with the determined specification, the value of P0 can be determined when the battery pack with the determined specification is subjected to test calibration.
As shown in fig. 3, in an embodiment of the system for detecting the sealing performance of a battery pack according to the present invention, the system further includes an acceleration sensor, and a signal output end of the acceleration sensor is connected to another input port of the controller; the start-stop control end of the air flow generating device is electrically connected to the other output port of the controller; the controller is internally prestored with an acceleration preset value a0, and is suitable for comparing a detection value a1 of the acceleration sensor with a0, if a1 is greater than a0, the controller starts the air flow generating device, collects a detection value Q1 of the air flow sensor, compares the detection value Q1 with Q0, and if Q1 is greater than Q0, outputs an alarm signal to the alarm device and starts an alarm at the same time. The acceleration preset value a0 is generally the maximum acceleration of the electric vehicle in a steady running state.
In this embodiment, through addding acceleration sensor, can real-time detection carry on the electric vehicle's of battery package travel state, if, when electric vehicle takes place the striking and when severe operating mode such as serious vibration on the way, instantaneous acceleration a1 that acceleration sensor detected can exceed acceleration default a0, can automatic trigger battery package leakproofness detect the flow this moment to and detect in time whether suffered the damage through the leakproofness of battery package behind the severe operating mode, effectively avoid the potential safety hazard.
In one embodiment of the system for detecting the sealing performance of the battery pack according to the present invention, the air flow generating device is adapted to suck air from the battery pack at a predetermined air pressure to generate a negative pressure air flow. The negative pressure is relative to the pressure in the battery pack, namely, the air pressure generated by the air flow generating device is negative relative to the pressure in the battery pack according to the preset air pressure, the air is sucked from the inside of the battery pack to the outside by the air flow generating device, and thus, the air flow flows from the inside of the battery pack to the outside of the air flow generating device. The negative pressure detection can effectively avoid abnormal opening of the explosion-proof valve caused by overlarge pressure in the battery pack, and the safety of the battery pack is ensured. The explosion-proof valve has a spring type and a thimble type, and can be opened when the pressure in the battery pack is overlarge. If for the explosion-proof valve of spring, even can bounce back after opening, but can influence sealed detection accuracy, the mistake reports the possibility height. If the valve is a thimble type explosion-proof valve, the valve loses the waterproof function after being opened, and the danger is high.
In one embodiment of the system for detecting the sealing performance of the battery pack according to the present invention, the air flow generating device is adapted to charge the battery pack with a predetermined air pressure to generate a positive pressure air flow. The positive pressure is relative to the pressure in the battery pack, that is, the air pressure generated by the air flow generating device is positive relative to the pressure in the battery pack according to the preset air pressure, and the external air flow generating device inflates air into the battery pack, so that the air flow flows from the air flow generating device into the battery pack. In order to avoid abnormal opening of the explosion-proof valve caused by overhigh air pressure in the battery pack, the preset inflation air pressure of the air flow generating device needs to be controlled within the safe range which can be borne by the explosion-proof valve.
In one embodiment of the system for detecting the sealing performance of a battery pack according to the present invention, the air flow generating device is an in-vehicle air conditioner or an air pump.
In one embodiment of the system for detecting the sealing performance of the battery pack according to the present invention, an air pressure regulating valve is connected between the air flow generating device and the sealing detection tube. The air pressure regulating valve is used as a constant pressure device for regulating the output air pressure of the air flow generating device to a preset air pressure, for example, the suction pressure range can be 1Kpa-10kPa, and the inflation pressure range can be 0-200 kPa. After the air pressure regulating valve regulates the air pressure in place, the stability of the tested air pressure can be ensured, so that the air flow is kept stable, and the tightness of the battery pack can be accurately detected conveniently.
In an embodiment of the battery pack tightness detection system according to the present invention, an air filtering membrane is disposed in the sealing detection interface, and the air flow is filtered by the air filtering membrane and then circulates between the air flow generation device and the battery pack. Under the positive pressure detection condition, harmful impurities such as dust in the outside air can be filtered by the air filtering membrane, the cleanliness of the gas in the battery pack is ensured, and the battery pack is safe and stable to operate.
In one embodiment of the system for detecting the sealability of a battery pack of the present invention, the controller is integrated with a battery management system of the battery pack. The controller can adopt a controller of a battery management system, so that the existing hardware resources of the battery pack can be comprehensively utilized, and the cost and the space are saved.
In an embodiment of the system for detecting the sealing performance of the battery pack, when the alarm device starts an alarm, the alarm device is suitable for displaying the warning information of the sealing failure of the battery pack on a central control screen and/or the warning information of the vehicle far from a water pit and sending out the warning information by using light and/or sound. Under the condition that detects that there is gaseous the revealing or sealed inefficacy in the battery package, alarm device can send warning information to driver and passenger with multiple form, and the driver and crew of being convenient for knows the encapsulated situation of battery package the very first time to in time take precautionary measure, improve the security.
The embodiment of the electric vehicle according to the present invention, which includes the battery pack sealing performance detection system provided in any embodiment of the battery pack sealing performance detection system, inevitably has the technical effects of any embodiment of the battery pack sealing performance detection system.
As shown in fig. 5 or 6, in one embodiment of the electric vehicle of the present invention, a speed limiting unit electrically connected to a controller of the battery pack sealability detection system is further included; when the battery pack sealing detection system gives an alarm, the controller is suitable for controlling the speed limiting unit to limit the running speed of the vehicle within a preset vehicle speed range. Under the condition that gas leakage or sealing failure of the battery pack is detected, the maximum speed of the electric vehicle can be controlled within a safety range through the speed limiting unit, so that the electric vehicle can be quickly braked and escape in case of emergency, and the safety of the vehicle is improved.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the specific features in any suitable way, and the invention will not be further described in relation to the various possible combinations in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (9)
1. A battery pack sealing detection system is characterized by comprising an airflow generation device, a gas flow sensor, an alarm device, a controller and an acceleration sensor; the air flow generating device is connected to a sealing detection interface of the battery pack through a sealing detection pipe and is suitable for generating air flow according to preset air pressure; the gas flow sensor is arranged in the sealing detection interface, and the signal output end of the gas flow sensor is electrically connected to one input port of the controller; the signal input end of the alarm device is electrically connected to one output port of the controller; the controller is internally pre-stored with a mapping table of the preset air pressure and the preset gas flow, and is suitable for comparing a detection value Q1 of the gas flow sensor with a gas flow pre-stored value Q0 in the mapping table, if Q1 is greater than Q0, an alarm signal is output to the alarm device, and meanwhile, the alarm device starts alarm according to the alarm signal;
the signal output end of the acceleration sensor is connected to the other input port of the controller; the start-stop control end of the air flow generating device is electrically connected to the other output port of the controller; the controller is internally prestored with an acceleration preset value a0, and is suitable for comparing a detection value a1 of the acceleration sensor with a0, if a1 is greater than a0, the controller starts the air flow generating device, collects a detection value Q1 of the air flow sensor, compares the detection value Q1 with Q0, and if Q1 is greater than Q0, outputs an alarm signal to the alarm device and starts an alarm at the same time.
2. The system for detecting the tightness of a battery pack according to claim 1, wherein the air flow generating device is adapted to suck air from the battery pack at a preset air pressure to generate a negative pressure air flow; or the air flow generating device is suitable for inflating the battery pack according to preset air pressure to generate positive pressure air flow.
3. The battery pack sealability detection system of claim 1, wherein the airflow generation device is an on-vehicle air conditioner or air pump.
4. The system of claim 1, wherein an air pressure regulating valve is connected between the air flow generator and the seal detection tube.
5. The system of claim 1, wherein an air filtration membrane is disposed in the sealing detection interface, and the air flow is filtered by the air filtration membrane and then circulated between the air flow generator and the battery pack.
6. The system of claim 1, wherein the controller is integrated with a battery management system of the battery pack.
7. The system for detecting the tightness of the battery pack according to claim 1, wherein the alarm device is adapted to display a battery pack sealing failure warning message on a central control screen and/or a vehicle away from a puddle warning message when the alarm device starts an alarm, and is adapted to emit a warning message with a light and/or a sound.
8. An electric vehicle characterized by comprising the battery pack sealability detection system of any one of claims 1 to 7.
9. The electric vehicle of claim 8, further comprising a speed limiting unit electrically connected to a controller of the battery pack sealability detection system; when the battery pack sealing detection system gives an alarm, the controller is suitable for controlling the speed limiting unit to limit the running speed of the vehicle within a preset vehicle speed range.
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| CN112611523A (en) * | 2020-12-22 | 2021-04-06 | 芜湖奇达动力电池系统有限公司 | New energy automobile battery pack sealing performance testing method |
| CN112697356A (en) * | 2020-12-23 | 2021-04-23 | 宝能(广州)汽车研究院有限公司 | Battery pack, leak detection method for battery pack, vehicle, and storage medium |
| CN113405743B (en) * | 2021-06-16 | 2022-08-16 | 迈威科技(广州)有限公司 | New energy electric vehicle production and manufacturing test data analysis processing method and system based on cloud computing and storage medium |
| CN117191183B (en) * | 2023-11-07 | 2024-03-26 | 宁德时代新能源科技股份有限公司 | Abnormal sound detection method, device, equipment, electronic equipment and readable storage medium |
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