CN112356674A - Early-stage deformation early-warning method and early-warning system for power battery pack - Google Patents
Early-stage deformation early-warning method and early-warning system for power battery pack Download PDFInfo
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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
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- 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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- 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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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- H—ELECTRICITY
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- H—ELECTRICITY
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- 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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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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
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- 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
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Abstract
The invention provides an early-stage deformation early-warning method and an early-warning system for a power battery pack, wherein the method comprises the following steps: analyzing a structural risk point on the battery pack, which is easy to generate impact deformation; installing a monitoring module at a structural risk point; the battery management system BMS receives the signals sent by the monitoring module and judges whether the signals are deformation mutation signals or not; if so, the battery management system BMS is communicated with the whole vehicle control unit, and sends an early warning signal that the battery pack pool structure is greatly deformed to the whole vehicle to request to execute the power-off operation; if not, the battery management system BMS judges whether the current deformation and the deformation rate reach the early warning threshold or not; if the battery pack structure reaches the preset value, the battery management system BMS communicates with the whole vehicle control unit, sends a signal for requesting to check the battery pack structure to the whole vehicle, and simultaneously limits the output current. The invention can monitor the deformation point and the key structure supporting point which are easy to cause the extrusion of the battery core in the battery pack in real time, pre-warn the risk of slow extrusion and inform the danger of sudden extrusion in time.
Description
Technical Field
The invention relates to the field of new energy automobiles, in particular to a battery for an electric automobile, and particularly relates to a power battery pack early-deformation early-warning method and system.
Background
At present, the popularity of new energy vehicles in China is gradually improved, and power battery systems with different electric quantities and high energy density are basically mounted in three main powers of electric vehicles in China, namely a pure electric vehicle (BEV), a plug-in hybrid electric vehicle (PHEV) and a fuel cell vehicle (FCEV). The electric core forming the core unit of the power battery system for the vehicle has the characteristic of being afraid of extrusion, can be improved only by increasing a heavy structure protection design at present, can cause obvious material waste and weight increase of the power battery pack by the method, cannot realize active reminding when the key structure of the power battery pack changes, and is contrary to the development idea of improving the energy density of the power battery system provided by the state. In addition, most power battery packs are arranged at the bottom of a vehicle, and the risk of invasion and performance degradation of three structures such as extrusion, deformation and support piece fracture of the structure part of the power battery pack can be increased by the extremely bumpy road condition and the easily-occurring 'bottom-supporting' phenomenon in the driving process of the vehicle. Wherein, when electric core directly received the extrusion in the power battery package, easily lead to power battery package smoking, on fire, even explosion, and the deformation of power battery package box probably leads to the box structure crackle or open clearance to appear, causes box structure IP protection level inefficacy, causes into water and short circuit fault, and this has caused very big risk threat to vehicle and interior personnel's safety.
In order to deal with the problem of deformation of the power battery pack, in the current stage, the scheme adopted is to perform structural abuse working condition finite element analysis on the power battery pack box body independently after the conventional design is finished, find out the risk points after the structural deformation, perform structural reinforcement, such as adding reinforcing ribs inside the battery pack, enlarging the gap between an electric core inside the battery pack and a bottom skin outer plate, and the like.
However, such a solution has some problems: the structure cost is increased, the weight of the battery pack is increased, the energy density of the battery pack is reduced, and meanwhile, no active feedback exists when the structure of the battery pack is abnormally changed.
Disclosure of Invention
In view of the above, the invention provides an early warning method and an early warning system for early warning of deformation of a power battery pack, which achieve the purpose of early warning of deformation of the power battery pack on the premise of not additionally increasing reinforcing ribs of an internal structure of the battery pack and gaps in the battery pack.
In order to achieve the purpose, the invention mainly provides the following technical scheme:
on one hand, the embodiment of the invention provides a power battery pack early deformation early warning method, which comprises the following steps:
step 2, installing a monitoring module at the structural risk point, and starting to monitor a deformation signal;
step 3, the battery management system BMS receives the signals sent by the monitoring module and judges whether the signals are deformation mutation signals or not;
step 4, if yes, judging whether the error signal is generated by the battery management system BMS according to a preset database and a strategy;
step 5, when the signal is correct, the battery management system BMS communicates with the whole vehicle control unit, sends an early warning signal that the battery pack structure is greatly deformed to the whole vehicle and requests to execute a power-off operation;
and 7, if the current reaches the preset value, the battery management system BMS communicates with the whole vehicle control unit, sends a signal for requesting to check the structure of the battery pack to the whole vehicle and limits the output current.
Further, in step 4, when the signal is erroneous, the battery management system BMS masks the error signal and does not process it.
Further, in step 6, if not, the battery management system BMS continues to receive the signal without processing.
Further, in step 5, after the whole vehicle responds to the primary early warning signal, the parking operation is executed after delaying for a preset time.
On the other hand, the embodiment of the invention also provides a power battery pack early deformation early warning system, which comprises: the system comprises a monitoring module, a battery management system BMS and a control unit; wherein the content of the first and second substances,
the monitoring module is positioned inside the power battery pack and used for detecting the deformation pressure of the battery pack;
the battery management system BMS is electrically connected with the detection module and used for receiving the signals sent by the monitoring module, judging the severity of structural deformation according to a preset program and sending early warning signals of different grades to the control unit;
and the control unit outputs corresponding control signals according to the corresponding early warning signal grades.
On the basis of the technical scheme, preferably, the monitoring module comprises a fixing plate, pressure sensors, compression springs and a cover plate, wherein one or more pressure sensors are arranged on the fixing plate, one end of each compression spring is fixedly connected with the pressure sensor, the other end of each compression spring is fixedly connected with a pressure receiving plate, the cover plate is fixedly arranged on the upper surface of the fixing plate, a movable hole for the compression spring to penetrate through is formed in the cover plate, the pressure sensors are connected in parallel through connecting harnesses, and the connecting harnesses are electrically connected with a battery management system BMS.
Further, preferably, the monitoring module further comprises a support and a conversion arm, the support is fixedly installed at one end of the fixing plate, the other end of the conversion arm is parallel to the fixing plate, a protruding portion corresponding to the pressed plate is arranged on the conversion arm, a connecting plate is arranged at one end, away from the support, of the conversion arm, the connecting plate is of an L-shaped structure, and a detection portion used for being in contact with the battery pack is arranged on the connecting plate.
Further, preferably, the monitoring module further comprises a filter circuit board, and the filter circuit board is connected in series to the connection harness.
Further, preferably, the alarm device further comprises an alarm unit connected with the control unit, wherein the alarm unit comprises at least one of a sound alarm module and a light alarm module.
Preferably, the control unit is a single chip microcomputer.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention discloses a power battery pack early-stage deformation early-warning method and an early-warning system, which are characterized in that all structural points which are most likely to have structural deformation and are easy to have serious safety consequences after the structural deformation are found out by analyzing the assembly environment of a power battery on a finished vehicle and the structural characteristics of the power battery pack, a monitoring module is installed and arranged, the monitoring module acquires the deformation variable and the deformation rate information of the battery pack in real time on line, a battery management system BMS compares the received data with a pre-designed database and a judgment strategy based on the deformation and the change rate, judges whether an alarm or early-warning threshold is reached, and feeds back early-warning information to a control unit of the finished vehicle in time. According to the early warning system, the monitoring module is additionally arranged, the hardware of the control part can borrow the existing power battery management system, and compared with the prior art, the number and the weight of structural members are reduced, the energy density of the battery pack is improved, and the volume utilization rate of the battery pack is improved. Meanwhile, deformation points and key structure supporting points which are easy to cause electric core extrusion in the battery pack are monitored in real time, the risk of slow extrusion is early warned, and sudden change extrusion danger is timely informed.
(2) The monitoring module is light and thin in structure, simple to install and low in cost. Through set up support and conversion arm on monitoring module, the one end that the support was kept away from to the conversion arm is provided with the connecting plate, and the connecting plate is L type structure, is provided with on the connecting plate to be used for the detection portion that contacts with the battery package. Therefore, the method can be applied to the position with small space size but larger safety risk after the structure is deformed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of an early warning method for deformation of a power battery pack according to an embodiment of the present invention;
fig. 2 is a flow chart of an early warning system for early deformation of a power battery pack disclosed in the embodiment of the invention;
FIG. 3 is a schematic structural diagram of a monitoring module according to an embodiment of the disclosure;
FIG. 4 is a schematic diagram of an internal structure of a monitoring module according to an embodiment of the disclosure;
FIG. 5 is a schematic diagram of an application scenario of a monitoring module according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a monitoring module according to another embodiment of the disclosure;
fig. 7 is a schematic view of an application scenario of a monitoring module according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The embodiment of the invention provides a power battery pack early deformation early warning method, which comprises the following steps of:
and S1, analyzing structural risk points on the battery pack, which are easy to generate impact deformation, according to different arrangement positions of the power battery on the whole vehicle.
Because the power battery pack is assembled on the whole vehicle and has the structural characteristics, the power battery pack has a plurality of structural points which are likely to generate structural deformation, and therefore, in order to effectively and accurately carry out early warning on the deformation of the battery pack, all the portions of the power battery pack, which are likely to have internal and external structural extrusion risks and structural deformation risks, can be found out first through structural design and finite element simulation software, and are marked as structural risk points.
And S2, mounting monitoring modules at all the structural risk points, and starting to perform real-time online deformation signal monitoring.
Specifically, the monitoring module may be mounted inside the battery pack, i.e., on the inner wall of the battery housing, and be in contact with the structural risk points of the battery pack.
And S3, the battery management system BMS receives the signals sent by the monitoring module and judges whether the signals are deformation mutation signals.
The monitoring module detects the deformation of the battery pack in real time on line, and the deformation is divided into sudden deformation and slow deformation. The sudden deformation means that the deformation quantity is suddenly increased or gradually increased in a step manner in a certain time interval. The slow deformation is that the deformation quantity is accelerated more stably and is increased slightly and uniformly in a certain time interval.
And S4, if yes, judging whether the signal is an error signal by the BMS according to a preset database and a strategy.
After receiving the deformation signal sent by the monitoring module, the battery management system BMS needs to judge whether the deformation occurs suddenly, so that the early warning is avoided when the battery management system BMS directly follows the misjudgment information sent by the monitoring module. Specifically, the preset database and the strategy are as follows: when the deformation quantity suddenly increases from t1 to t2, and after the deformation quantity suddenly becomes normal from t2 to t3, the database defaults to the fact that the monitoring module has misjudgment, and the signal is an error signal.
And S5, when the signal is wrong, the battery management system BMS masks the mistake and does not process the mistake. When the signal is correct, a certain risk structure point of current battery package is out of shape suddenly promptly, indicate that current vehicle is in one-level safety risk, battery management system BMS and whole car the control unit communication, and send the early warning signal that battery package structure huge deformation appears, suggestion whole car the control unit and carry out the intervention measure immediately, battery package sharp deformation during this moment, there is major potential safety hazard such as explosion or fire, at this moment, battery management system BMS can send out the request and carry out the outage operation, treat that whole car the control unit responds after battery management system BMS information input, carry out corresponding outage operation.
And S6, if the battery management system BMS judges that the current deformation is a non-deformation sudden change signal, the current deformation of the battery is zero or the slow deformation risk exists. At this time, the battery management system BMS needs to determine whether the current deformation amount and the deformation rate reach the warning threshold, that is, whether the deformation amount reaches the warning threshold within a predetermined time interval or the deformation rate reaches the warning threshold within a certain time.
And S7, if the battery pack deformation quantity is not reached, the battery pack deformation quantity is in a safe state, and the battery management system BMS continues to receive signals and does not process the signals. If the situation is met, the slow deformation risk of the battery pack is indicated, at the moment, the battery management system BMS is communicated with the whole vehicle control unit, sends a signal for requesting to check the structure of the battery pack to the whole vehicle, and simultaneously limits the output current. And after responding to the input of the BMS information of the battery management system, the whole vehicle control unit limits the current output of the battery pack, and stops the vehicle to check the structure of the battery pack under the condition of proper conditions.
In the step 5, after the vehicle responds to the BMS input signal, the power-off operation of the battery pack cannot be immediately performed, a certain time is delayed to prevent the vehicle from suddenly turning off while the vehicle is running, and specifically, 35S can be delayed to perform the power-off operation after the vehicle slowly stops.
By adopting the technical scheme, all structural points which are most likely to have structural deformation and are easy to have serious safety consequences after the structural deformation are found out by analyzing the assembly environment of the power battery on the whole vehicle and the structural characteristics of the power battery pack, the monitoring module is installed and arranged, the monitoring module acquires the deformation quantity and the deformation rate information of the battery pack on line in real time, the battery management system BMS compares the received data with a pre-designed database and a judgment strategy based on the deformation quantity and the deformation rate, judges whether an alarm or an early warning threshold is reached, and timely feeds back early warning information to the control unit of the whole vehicle. According to the early warning system, the monitoring module is additionally arranged, the hardware of the control part can borrow the existing power battery management system, and compared with the prior art, the number and the weight of structural members are reduced, the energy density of the battery pack is improved, and the volume utilization rate of the battery pack is improved. Meanwhile, deformation points and key structure supporting points which are easy to cause electric core extrusion in the battery pack are monitored in real time, the risk of slow extrusion is early warned, and sudden change extrusion danger is timely informed.
In order to implement the above method embodiment, the present invention further discloses an early warning system for early deformation of a power battery pack, as shown in fig. 2, the system includes: monitoring module 1, battery management system BMS2 and control unit 3.
The monitoring module 1 is located inside the power battery pack and used for detecting the deformation pressure of the battery pack 100.
And the battery management system BMS2 is electrically connected with the detection module and used for receiving signals sent by the monitoring module 1, judging the severity of structural deformation according to a preset program and sending early warning signals of different grades to the control unit 3.
And the control unit 3 outputs corresponding control signals according to the corresponding early warning signal grades.
The early warning system disclosed by the invention firstly finds out all possible positions of internal and external structure extrusion risks and structure deformation risks of the power battery pack through structure design and finite element simulation software, marks the positions as structure risk points, and installs a monitoring module 1 at the structure risk points of the battery pack for detecting the deformation pressure of the battery pack. The monitoring module 1 carries out real-time online detection for 10 times/s through low-voltage power supply, a detection signal is sent to the battery management system BMS2, the battery management system BMS2 judges the severity of structural deformation according to a preset program, early warning signals of different levels are sent to the control unit 3, and finally the control unit 3 outputs a corresponding control signal according to the level of the corresponding early warning signal.
Specifically, as an embodiment, referring to fig. 3, 4 and 5, the monitoring module 1 includes a fixing plate 11, pressure sensors 12, compression springs 13 and a cover plate 14, wherein one or more pressure sensors 12 are disposed on the fixing plate 11, one end of each compression spring 13 is fixedly connected to one of the pressure sensors 12, the other end of each compression spring 13 is fixedly connected to a pressure receiving plate 15, the cover plate 14 is fixedly disposed on the upper surface of the fixing plate 11, a movable hole 141 for allowing the compression spring 13 to pass through is disposed on the cover plate 14, the pressure sensors 12 are connected in parallel by a connection harness, and the connection harness is electrically connected to the battery management system BMS 2.
Adopt above-mentioned technical scheme, monitoring module 1 can install whole monitoring module 1 inside the battery package when installing, and is preferred, can place on battery case inner wall, and is concrete, can fix fixed plate 11 and battery case inner wall to make and receive pressure plate 15 and battery package structure risk point lateral wall and contact. These structure risk points can be that the electricity core module takes place to warp at the during operation, carry out extrusion deformation to battery case. When the structural point that the battery package needs to monitor takes place suddenly deformation or slowly deforms, can push away and extrude pressed plate 15, pressed plate 15 exerts pressure to pressure sensor 12 through compression spring 13, the sudden change pressure or the slowly changing pressure that pressure sensor 12 received change into analog signal, then give battery management system with signal transmission, battery management system BMS2 is receiving the signal that monitoring module 1 sent, judge the structure deformation severity according to preset program, and according to the severity difference, send early warning signal and the suggestion measure of different grades to whole car the control unit 3.
As another example, when the space of the battery pack is relatively narrow, the monitoring module according to the above embodiment cannot be placed in the battery pack, and in order to adapt to the installation of the monitoring module 1 at a position where the space size is narrow but the safety risk is high after the structural deformation, as shown in fig. 6 and 7, the invention adopts the following technical scheme: the monitoring module 1 further comprises a support 16 and a conversion arm 17, the support 16 is fixedly mounted at one end of the fixing plate 11, the other end of the conversion arm 17 is parallel to the fixing plate 11, a protruding portion 171 corresponding to the pressed plate 15 is arranged on the conversion arm 17, a connecting plate 172 is arranged at one end, far away from the support 16, of the conversion arm 17, the connecting plate 172 is of an L-shaped structure, and a detection portion 173 used for being in contact with a battery pack is arranged on the connecting plate 172. By adopting the technical scheme, when the monitoring module 1 is installed, the connecting plate 172 is attached to the side wall of the battery pack structure risk point, and the detection part 173 is used for detecting the pressure of the battery pack structure risk point. Because one end of the conversion arm 17 is horizontally and fixedly connected with the bracket 16, the other end of the conversion arm 17 has certain elastic deformation, when the structural point of the battery pack to be monitored is suddenly deformed or slowly deformed, the connection plate 172 is extruded, after the connection plate 172 is extruded, the conversion arm 17 is driven to deflect around one end of the bracket 16, the bulge 171 on the conversion arm 17 is utilized to extrude the pressure receiving plate 15, the pressure receiving plate 15 applies pressure to the pressure sensor 12 through the compression spring 13, the sudden change pressure or the slowly change pressure received by the pressure sensor 12 is converted into an analog signal, and then the signal is sent to the battery management system, the battery management system BMS2 receives the signal sent by the knife monitoring module 1, the severity of the structural deformation is judged according to a preset program, and is different according to the severity, and sending early warning signals and suggested measures of different grades to the whole vehicle control unit 3.
In the above embodiment, the validity and timeliness of the monitoring data are ensured by the way of jointly and independently detecting the multiple groups of compression springs 13 and the pressure sensors 12. That is, when one of the pressure sensors 12 or the compression springs 13 fails, the other pressure sensors 12 or the compression springs 13 can also perform the monitoring function normally. Multiple sets of pressure sensors 12 may also be used to simultaneously monitor the data and average the data.
In order to eliminate the difference between the compression amount and the rebound amount of the compression spring 13 on the monitoring module 1 and different structure points, self calibration can be performed by an upper computer of the control unit 3, so that initial pressure data is used as a monitoring zero-bit value.
On the basis of the above technical solution, the monitoring module 1 further includes a filter circuit board 18, and the filter circuit board 18 is connected in series to the connection harness. The filtering circuit board 18 is provided with an ASIC chip, the ASIC chip performs initial filtering on the received pressure analog data, converts the received pressure analog data into a digital signal, and transmits effective data to an externally connected battery management system BMS2 through a connection harness.
The analog signal of the pressure sensor is transmitted to the ASIC chip, the ASIC chip converts the received signal into a digital signal and transmits the digital signal to the battery management system BMS through a hard wire, and the BMS eliminates invalid signals according to a preset program and performs grading processing. The processing logic is basically as follows:
the corresponding digital signals are divided into levels 1-4, each level corresponds to an inherent deformation, for example, the deformation corresponding to level 1 is within 1mm, the deformation corresponding to level 2 is within 3mm, the deformation corresponding to level 3 is within 5mm, and the deformation corresponding to level 4 is more than 5 mm;
level and action correspondence:
the signal sampling period is 250ms, if the deformation reaches level 1 in one sampling period, the deformation does not change in the second period, or the deformation is less than or equal to +0.5mm in the next 10 periods, the level 1 is continuously determined by default, and the processing mode is not processing;
if the deformation reaches level 1 in a sampling period, the deformation reaches level 2 in a second period, but the deformation is less than or equal to +0.5mm in the next 10 periods, the default is continued to be level 2, the processing mode is early warning, and the power-off action is not executed;
if the deformation reaches level 1 in one sampling period, the deformation directly reaches level 2 or level 3 in the second period, but the deformation is less than or equal to +0.5mm in the next 10 periods, the level 3 is continuously defaulted, the treatment mode is early warning, the discharge current is limited until risk is eliminated, and the fault code is manually cleared;
if the deformation reaches level 1 in one sampling period, the deformation directly reaches level 4 in the second period; in the second period, the level 2 or the level 3 is reached, and in the next 10 periods, the deformation amount is > +0.5mm, the level 4 is directly defaulted, the processing mode is alarm, the discharging current is limited, the power is cut off after 35s until the risk is eliminated, and the fault code is manually clarified.
In this embodiment, the control unit 3 may adopt a single chip microcomputer with data input, output and operation processing capabilities, the single chip microcomputer also belongs to a well-established technology in the prior art, and the design and development difficulty of the control unit 3 can be greatly reduced by selecting the single chip microcomputer on the basis of realizing the design function, and the reduction of the overall cost of the early warning system can be facilitated.
The early warning system disclosed by the invention also comprises an alarm unit connected with the control unit 3, wherein the alarm unit comprises at least one of a sound alarm module and a light alarm module. The sound alarm module can adopt a buzzer for example, and the light alarm module can adopt an alarm lamp. Simultaneously, when concrete implementation, bee calling organ and alarm lamp all can set up on the instrument desk of car to can do benefit to the driver and take advantage of the alarm signal that bee calling organ and alarm lamp sent, and the alarm lamp more can arrange together with the combination meter integration of instrument desk department, overall layout when also can be convenient for automobile development from this.
When the monitoring module 1 monitors that the battery pack is suddenly deformed or slowly deformed, the battery management system BMS2 sends an early warning signal to the control unit 3, and the control unit 3 reflects the early warning signal through the alarm unit. When the battery pack is suddenly deformed, the buzzer and the alarm lamp in the alarm unit can simultaneously send out alarm signals to remind a user that the current battery pack is in fire or explosion risk, and prompt the current vehicle to have a larger safety risk, and the control unit 3 controls the battery pack to be powered off under a proper condition so as to be used for troubleshooting of the user. When the monitoring module 1 monitors that the battery pack is slowly deformed, the honey device and the alarm lamp in the alarm unit can only carry out alarm prompt to remind a user of the potential safety hazard of the current battery and timely carry out troubleshooting.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The early-stage deformation early-warning method for the power battery pack is characterized by comprising the following steps of:
step 1, analyzing structural risk points which are easy to generate impact deformation on a battery pack according to different arrangement positions of power batteries on a whole vehicle;
step 2, installing a monitoring module at the structural risk point, and starting to monitor a deformation signal;
step 3, the battery management system BMS receives the signals sent by the monitoring module and judges whether the signals are deformation mutation signals or not;
step 4, if yes, judging whether the error signal is generated by the battery management system BMS according to a preset database and a strategy;
step 5, when the signal is correct, the battery management system BMS communicates with the whole vehicle control unit, sends an early warning signal that the battery pack structure is greatly deformed to the whole vehicle and requests to execute a power-off operation;
step 6, in step 4, if not, the battery management system BMS judges whether the current deformation and the deformation rate reach an early warning threshold;
and 7, if the current reaches the preset value, the battery management system BMS communicates with the whole vehicle control unit, sends a signal for requesting to check the structure of the battery pack to the whole vehicle and limits the output current.
2. The early warning method for the deformation of the power battery pack as claimed in claim 1, wherein: in step 4, when the signal is erroneous, the battery management system BMS masks the error signal and does not process it.
3. The early warning method for the deformation of the power battery pack as claimed in claim 1, wherein: in step 6, if not, the battery management system BMS continues to receive the signal without processing.
4. The early warning method for the deformation of the power battery pack as claimed in claim 1, wherein: in step 5, after the whole vehicle corresponds to the primary early warning signal, the parking operation is executed after delaying the preset time.
5. The utility model provides a power battery package early warning system that warp which characterized in that: the monitoring system comprises a monitoring module (1), a battery management system BMS (2) and a control unit (3);
the monitoring module (1) is positioned inside the power battery pack and used for detecting the deformation pressure of the battery pack;
the battery management system BMS (2) is electrically connected with the detection module and used for receiving the signals sent by the monitoring module (1), judging the severity of structural deformation according to a preset program and sending early warning signals of different grades to the control unit (3);
and the control unit (3) outputs corresponding control signals according to the corresponding early warning signal grades.
6. The early warning system of claim 5, wherein: monitoring module (1) is including fixed plate (11), pressure sensor (12), compression spring (13) and apron (14), pressure sensor (12) are provided with one or more on fixed plate (11), the one end and pressure sensor (12) fixed connection of compression spring (13), and other end fixed connection receives pressure plate (15), apron (14) are fixed to be set up on fixed plate (11) upper surface, and are provided with movable hole (141) that are used for compression spring (13) to pass on apron (14), each pressure sensor (12) connect in parallel through connecting the pencil, connecting the pencil and being connected with battery management system BMS (2) electricity.
7. The early warning system of claim 6, wherein: monitoring module (1) still includes support (16) and conversion arm (17), support (16) fixed mounting is in the one end of fixed plate (11), and the other end of conversion arm (17) keeps parallel with fixed plate (11), is provided with on conversion arm (17) with receive protruding portion (171) that pressure plate (15) are corresponding, the one end that support (16) were kept away from in conversion arm (17) is provided with connecting plate (172), connecting plate (172) are L type structure, be provided with on connecting plate (172) and be used for detection portion (173) that contact with the battery package.
8. The early warning system for early deformation of power battery pack according to claim 6 or 7, characterized in that: the monitoring module (1) further comprises a filter circuit board (18), and the filter circuit board (18) is connected in series on the connecting wire harness.
9. The early warning system of claim 5, wherein: the alarm device is characterized by further comprising an alarm unit connected with the control unit (3), wherein the alarm unit comprises at least one of a sound alarm module and a light alarm module.
10. The early warning system of claim 9, wherein: the control unit (3) is a singlechip.
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| CN202011057830.XA CN112356674B (en) | 2020-09-29 | Early deformation early warning method for power battery pack |
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|---|---|---|---|
| CN202011057830.XA CN112356674B (en) | 2020-09-29 | Early deformation early warning method for power battery pack |
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| CN112356674A true CN112356674A (en) | 2021-02-12 |
| CN112356674B CN112356674B (en) | 2024-06-21 |
Family
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112763136A (en) * | 2021-04-08 | 2021-05-07 | 南京英锐创电子科技有限公司 | Power battery pack pressure alarm system and alarm method |
| CN113525095A (en) * | 2021-07-16 | 2021-10-22 | 重庆大学 | Electric automobile early warning system |
| WO2023097507A1 (en) * | 2021-11-30 | 2023-06-08 | 华为技术有限公司 | Battery safety early warning method and apparatus |
| CN117308863A (en) * | 2023-11-22 | 2023-12-29 | 宁德时代新能源科技股份有限公司 | Method and device for detecting collision damage of battery pack, electronic equipment and storage medium |
| CN117790956A (en) * | 2024-02-27 | 2024-03-29 | 福建省宇安机电设备有限公司 | External thermal runaway detection device of battery package |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4541283A (en) * | 1984-02-25 | 1985-09-17 | Westinghouse Fanal-Schaltgeraete Gmbh | Pressure sensor |
| EP1293764A2 (en) * | 2001-09-13 | 2003-03-19 | Prettl, Rolf | Optical pressure measuring arrangement |
| RU2395065C1 (en) * | 2009-04-22 | 2010-07-20 | Федеральное государственное унитарное предприятие Федеральный научно-производственный центр "Алтай" | Method of determination jet engine thrust and device for realising said method |
| DE102010021999A1 (en) * | 2010-05-29 | 2011-12-01 | Gunther Neumann | Method for measuring speed of cyclist against air, involves forwarding measured values together with measured values of speed, path and inclination to bicycle computer for analysis |
| CN105125225A (en) * | 2015-05-13 | 2015-12-09 | 上海市中西医结合医院 | Instrument for measuring human body finger pressing force |
| CN108011135A (en) * | 2017-11-24 | 2018-05-08 | 深圳伊讯科技有限公司 | A kind of cell expansion measuring method and system |
| KR20190060654A (en) * | 2017-11-24 | 2019-06-03 | 한국전자통신연구원 | Load vector measuring apparatus |
| CN209247208U (en) * | 2018-11-22 | 2019-08-13 | 青岛海汇德电气有限公司 | Pressure sensor assembly |
| CN110239348A (en) * | 2019-05-24 | 2019-09-17 | 北京航空航天大学 | A kind of electric automobile power battery safety detecting system and method |
| CN110739495A (en) * | 2019-09-19 | 2020-01-31 | 国网江苏省电力有限公司电力科学研究院 | Thermal runaway monitoring device, system and method for energy storage battery modules |
| CN210758228U (en) * | 2019-08-20 | 2020-06-16 | 泰州市五星教学设备有限公司 | Feeding device of sofa board cutting machine |
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4541283A (en) * | 1984-02-25 | 1985-09-17 | Westinghouse Fanal-Schaltgeraete Gmbh | Pressure sensor |
| EP1293764A2 (en) * | 2001-09-13 | 2003-03-19 | Prettl, Rolf | Optical pressure measuring arrangement |
| RU2395065C1 (en) * | 2009-04-22 | 2010-07-20 | Федеральное государственное унитарное предприятие Федеральный научно-производственный центр "Алтай" | Method of determination jet engine thrust and device for realising said method |
| DE102010021999A1 (en) * | 2010-05-29 | 2011-12-01 | Gunther Neumann | Method for measuring speed of cyclist against air, involves forwarding measured values together with measured values of speed, path and inclination to bicycle computer for analysis |
| CN105125225A (en) * | 2015-05-13 | 2015-12-09 | 上海市中西医结合医院 | Instrument for measuring human body finger pressing force |
| CN108011135A (en) * | 2017-11-24 | 2018-05-08 | 深圳伊讯科技有限公司 | A kind of cell expansion measuring method and system |
| KR20190060654A (en) * | 2017-11-24 | 2019-06-03 | 한국전자통신연구원 | Load vector measuring apparatus |
| CN209247208U (en) * | 2018-11-22 | 2019-08-13 | 青岛海汇德电气有限公司 | Pressure sensor assembly |
| CN110239348A (en) * | 2019-05-24 | 2019-09-17 | 北京航空航天大学 | A kind of electric automobile power battery safety detecting system and method |
| CN210758228U (en) * | 2019-08-20 | 2020-06-16 | 泰州市五星教学设备有限公司 | Feeding device of sofa board cutting machine |
| CN110739495A (en) * | 2019-09-19 | 2020-01-31 | 国网江苏省电力有限公司电力科学研究院 | Thermal runaway monitoring device, system and method for energy storage battery modules |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112763136A (en) * | 2021-04-08 | 2021-05-07 | 南京英锐创电子科技有限公司 | Power battery pack pressure alarm system and alarm method |
| CN113525095A (en) * | 2021-07-16 | 2021-10-22 | 重庆大学 | Electric automobile early warning system |
| WO2023097507A1 (en) * | 2021-11-30 | 2023-06-08 | 华为技术有限公司 | Battery safety early warning method and apparatus |
| CN117308863A (en) * | 2023-11-22 | 2023-12-29 | 宁德时代新能源科技股份有限公司 | Method and device for detecting collision damage of battery pack, electronic equipment and storage medium |
| CN117308863B (en) * | 2023-11-22 | 2024-04-12 | 宁德时代新能源科技股份有限公司 | Method and device for detecting collision damage of battery pack, electronic equipment and storage medium |
| CN117790956A (en) * | 2024-02-27 | 2024-03-29 | 福建省宇安机电设备有限公司 | External thermal runaway detection device of battery package |
| CN117790956B (en) * | 2024-02-27 | 2024-04-23 | 福建省宇安机电设备有限公司 | External thermal runaway detection device of battery package |
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