CN112614115A - Power battery water seepage monitoring method - Google Patents
Power battery water seepage monitoring method Download PDFInfo
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- CN112614115A CN112614115A CN202011582302.6A CN202011582302A CN112614115A CN 112614115 A CN112614115 A CN 112614115A CN 202011582302 A CN202011582302 A CN 202011582302A CN 112614115 A CN112614115 A CN 112614115A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/60—Analysis of geometric attributes
- G06T7/62—Analysis of geometric attributes of area, perimeter, diameter or volume
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold
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Abstract
The invention belongs to the technical field of power batteries, and discloses a power battery water seepage monitoring method, which comprises the following steps: acquiring a black-and-white image of a region to be monitored of the test paper; generating the outline of the black-and-white image according to the black-and-white image; calculating the area of the water seepage patch according to the contour; judging whether the area of the water seepage patch is 0 or not; if not, judging whether the area of the water seepage patch is larger than a first preset area threshold value or not, and if the area of the water seepage patch is larger than the first preset area threshold value, judging that the power battery seeps water. The black and white image of the area to be monitored is obtained, a high-quality image pickup device is not needed, and the monitoring cost is reduced; if water seepage occurs, water seepage patches can appear in a shot image of the test paper, whether water seepage of the power battery occurs or not is judged by calculating the area of the water seepage patches and comparing the area of the water seepage patches with a first preset area threshold value, the power battery is prevented from being detached, and the monitoring cost is further reduced.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a power battery water seepage monitoring method.
Background
With the high-speed development of power battery technology, the cruising ability of the battery is continuously improved, the sales volume of the electric automobile is increased year by year, the safety concern of the electric automobile is continuously increased, and particularly the high-voltage insulation problem is the most important factor of the high-voltage safety of the electric automobile. The power battery assembly of the electric vehicle is filled with water to cause insulation problems to a certain extent, and then safety accidents are caused. Therefore, more and more design schemes and monitoring methods are provided for the sealing and water proofing of the power battery assembly, but the monitoring of air tightness is mostly concentrated in the factory-qualified monitoring item of the power battery assembly, the design for the sealing performance monitoring of the electric vehicle in the using process is very few, and along with the increase of the service life of the battery vehicle, the problems of torque attenuation, sealing element aging and the like are easily caused by long-term use, and further the problems of sealing performance reduction and even insulation fault caused by water inflow of the power battery assembly are caused.
The high-voltage connector socket and the low-voltage connector socket are arranged on the battery end plate and used for connecting a high-voltage wire harness and a low-voltage wire harness, the sockets are connected with the connecting bolts of the end plate, and the sockets and the end plate are sealed by pressing the sealing rings on the sockets. After a vehicle runs for a certain time, when a sealing structure is aged, the torque of a bolt is insufficient or attenuated, and water leakage occurs in a high-voltage connector, the sealing of a battery end plate is not up to the standard, and water inflow occurs in a battery pack to cause a high-voltage safety problem.
Although the prior art has an insulation monitoring function, when the particularity of the water inlet position of the battery pack or the water inlet amount is small and does not reach a set insulation alarm threshold value, or the known high-voltage system has a water seepage situation but cannot judge whether water seeps in the battery pack, the shell of the battery box body is damaged by means of cutting and the like to confirm the water seepage situation in the battery pack, the water seepage confirming means has high cost, and for an individual user, if the water seepage phenomenon is not confirmed in the battery pack after the battery pack is cut, the user still needs to pay new cost of the battery box body, labor cost and the like, and the maintenance period is long, so that the user complaints easily.
On the other hand, if only slight infiltration takes place for the battery tip, if can in time adopt remedial measure then promote the life of battery greatly, also can avoid unnecessary cost of maintenance.
Disclosure of Invention
The invention aims to provide a power battery water seepage monitoring method to solve the problem of overhigh battery water seepage monitoring cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a power battery water seepage monitoring method, which comprises the following steps:
acquiring a black-and-white image of a region to be monitored of the test paper;
generating an outline of the black-and-white image according to the black-and-white image;
calculating the area of the water seepage patch according to the contour;
judging whether the area of the water seepage patch is 0 or not;
if not, judging whether the area of the water seepage patch is larger than a first preset area threshold value or not, and if the area of the water seepage patch is larger than the first preset area threshold value, judging that the power battery seeps water.
As a preferable scheme of the power battery water seepage monitoring method, a background color area and a water-diffusing ink area are arranged on the surface of the test paper, the water-diffusing ink area surrounds the inner edge of the area to be monitored, and after the test paper encounters water, the water-diffusing ink area irreversibly diffuses in the background color area and forms the water seepage patch.
As a preferable scheme of the power battery water seepage monitoring method, in the step of generating the contour of the black-and-white image according to the black-and-white image, the contour is generated by calculation with a Prewitt operator.
As a preferable scheme of the power battery water seepage monitoring method, the step of calculating the water seepage patch area according to the profile includes:
the water-permeable patch area is set to be the product of the outline area and the coefficient k, and the area of the water-permeable ink area is subtracted.
As a preferable scheme of the power battery water seepage monitoring method, after judging whether the area of the water seepage patch is 0, the method further comprises the following steps:
if the area of the water seepage patch is 0, judging that the power battery does not seep water;
and returning to the step to obtain a black-and-white image of the area to be monitored of the test paper after the interval T1 is long.
As a preferable scheme of the power battery water seepage monitoring method, after judging whether the area of the water seepage patch is 0, the method further comprises the following steps:
if not, judging whether the area of the water seepage patch is larger than a first preset area threshold value or not, and if the area of the water seepage patch is smaller than the first preset area threshold value, entering the step to judge that the power battery does not seep water.
As a preferable scheme of the power battery water seepage monitoring method, after the step of determining that the power battery has water seepage, the method further comprises:
a first alarm is initiated.
As a preferable scheme of the power battery water seepage monitoring method, after judging whether the area of the water seepage patch is 0, the method further comprises the following steps:
judging whether the area of the water seepage patch is smaller than a second preset area threshold value or not;
if the area of the water seepage patch is smaller than the second preset area threshold value, judging whether the repetition times reach N times or not;
if the repetition times reach N times, judging whether the area of the water seepage patch is smaller than the second preset area threshold value again;
and if the area of the water seepage patch is smaller than the second preset area threshold value, judging that the power battery slightly seeps water.
As a preferable scheme of the power battery water seepage monitoring method, if the area of the water seepage patch is smaller than the second preset area threshold, the step of judging whether the repetition number reaches N times further includes:
and if the repetition times are less than N times, returning to the step to obtain the black-and-white image of the area to be monitored of the test paper after the interval T2 is long.
As a preferable scheme of the power battery water seepage monitoring method, after the step of determining that the power battery is slightly water seepage, the method further comprises: turning on a second alarm; and the second alarm is distinct from the first alarm.
The invention has the beneficial effects that: the black and white image of the area to be monitored is obtained, a high-quality image pickup device is not needed, and the monitoring cost is reduced; if water seepage occurs, water seepage patches can appear in a shot image of the test paper, whether water seepage of the power battery occurs or not is judged by calculating the area of the water seepage patches and comparing the area of the water seepage patches with a first preset area threshold value, the power battery is prevented from being detached, and the monitoring cost is further reduced.
Drawings
Fig. 1 is a schematic diagram of a power cell according to an embodiment of the present disclosure from a first perspective;
FIG. 2 is a schematic diagram of a power cell according to an embodiment of the present disclosure from a second perspective;
FIG. 3 is a schematic diagram of the test paper of the present application after the water-dispersible ink zone has been dispersed in the presence of water;
fig. 4 is a flowchart of a power battery water seepage monitoring method according to an embodiment of the present application;
FIG. 5 is a black-and-white image of the area to be detected of the test strip according to the embodiment of the present application;
FIG. 6 is a template of Prewitt operator according to the first embodiment of the present application;
FIG. 7 is a schematic diagram of an outline generated from the black-and-white image shown in FIG. 5 according to an embodiment of the present application;
FIG. 8 is a grayscale image taken from the outline of FIG. 7 according to the first embodiment of the present application;
fig. 9 is a flowchart of a power battery water seepage monitoring method according to the second embodiment of the present application.
In the figure:
1-a shell; 11-cell end plate;
2-a connector receptacle;
3-test paper; 31-background color zone; 32-water-diffusive ink zone; 33-water-permeable plaque;
4-a camera;
5-darkroom light;
6-an alarm device;
7-a control unit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The power battery water seepage monitoring method of the embodiment of the application is applied to a power battery, and as shown in fig. 1 and fig. 2, the power battery comprises a shell 1, a connector socket 2, test paper 3, a shooting device 4, a darkroom lamp 5, an alarm device 6 and a control unit 7.
Preferably, the geometric center of the connector insertion hole coincides with the geometric center of the battery end plate 11, and when the connector receptacle 2 is placed, it is symmetrical as a whole and looks beautiful.
It should be noted that, in the embodiment of the present application, in order to monitor water seepage, it is essential to monitor water seepage performance between the connector socket 2 and the connector jack, and therefore, the area to be monitored is a certain range of the periphery of the connector jack, and the area to be monitored is determined by the shooting range of the shooting device 4. On the one hand, it is understood that the housing 1 is not slotted at other positions than the possible slots between the connector jacks and the connector jacks 2. On the other hand, if the power battery is to monitor water permeability at other positions, the test paper 3 may be disposed at the corresponding position. The present invention is not limited thereto.
The test paper 3 is arranged on the inner surface of the battery end plate 11, the test paper 3 is arranged around the periphery of the connector socket 2, and the test paper 3 is connected with the edge of the connector jack in a sealing mode.
The test paper 3 is a water-encountering color-changing test paper, and the test paper 3 cannot change color when meeting water vapor. In the embodiment of the present application, the surface of the test paper 3 is provided with a background color area 31 and a water-diffusing ink area 32, the water-diffusing ink area 32 surrounds the inner edge of the area to be monitored, the background color area 31 has a first color, and the water-diffusing ink area 32 has a second color. In the embodiment of the present application, the first color is white, i.e., the ground color region 31 is white; the second color is black, that is, the water-dispersible ink area 32 is black, when the test paper 3 encounters water, the water-dispersible ink area 32 irreversibly diffuses in the ground color area 31 to form a water-permeable patch 33, and fig. 3 is a schematic diagram of the test paper 3 after the water-dispersible ink area 32 encounters water and diffuses.
The imaging device 4 is disposed inside the housing 1 and faces the test paper 3, and the imaging area of the imaging device 4 completely covers the surface area of the test paper 3 and exceeds the surface area of the test paper 3, so that once a patch occurs on the test paper 3, the imaging device 4 can image the patch. Meanwhile, the region to be monitored of the embodiment of the present application does not cover the whole test paper 3, but only is a preset certain region, so that the amount of later-stage calculation can be reduced.
A darkroom lamp 5 is arranged inside the housing 1 and is capable of illuminating at least the test paper 3. In the present embodiment, the darkroom lamp 5 emits red light, and the darkroom lamp 5 is a red LED lamp.
The alarm device 6 is arranged on the outer surface of the shell 1, and the control unit 7 is arranged inside the shell 1 and is connected with the shooting device 4 and the alarm device 6. In addition, a battery body is arranged in the power battery to supply power for each device.
It should be noted that, please refer to the following method for monitoring water leakage of power battery for how to implement water leakage monitoring between devices.
Example one
A flow chart of a power battery water seepage monitoring method provided in an embodiment is shown in fig. 4, and the monitoring method includes: s100, obtaining a black-and-white image of the area to be monitored of the test paper.
Specifically, the test paper 3 is shot by the shooting device 4, the test paper 3 is focused on the CMOS through a lens of the shooting device 4, the CMOS is composed of a plurality of pixel points, each pixel is composed of a light emitting diode and a related circuit, the diode converts light into electric charge, the total amount of the collected electric charge is in a certain proportion to the intensity of the light, the accumulated electric charge is transmitted to the control unit 7 under the control of the mutual circuit, and a shot image of the test paper 3 is obtained after filtering, amplification and DSP processing, and the shot image is a black-and-white image.
If there is no water seepage, the black-white image presents a white background color area 31 and a black rectangular frame-shaped water-color-changeable ink area 32. If the power battery is permeated, water flows into the inner surface of the battery end plate 11 from the connector jack and firstly permeates into the color-changing ink area 32 of the test paper 3, the water-diffusing ink area 32 of the test paper 3 irreversibly diffuses in the ground color area 31 to form a water-permeated patch 33 (as shown in fig. 3), and a color block with gray scale also appears in a black-and-white image at the moment, as shown in fig. 5.
The monitoring method further includes, after step S100: s200, generating the contour of the black-and-white image according to the black-and-white image.
Specifically, the control unit 7 generates the contour by using a Prewitt operator, and the Prewitt operator has the following calculation formula:
FIG. 6 is a diagram of the Prewitt operator template according to the first embodiment of the present invention, showing the gradient g in the x and y directions at the pixel point P5xAnd gyRespectively calculated as:
and defining a template through Numpy, calling a filter2D () function of OpenCV to realize convolution operation on the image, and finally realizing edge extraction through convertScaleabs () and addWeighted () functions. The filter2D () function usage is as follows:
dst＝filter2D(src,ddepth,kernel[,dst[,anchor[,delta[,borderType]]]])
wherein the parameter src represents an input image; dst represents an output edge map, and the size and the number of channels of the output edge map are the same as those of the input image; ddepth represents the required depth of the target image; kernel represents a convolution kernel, a single-channel floating-point type matrix; anchor represents the reference point of the kernel, with default value (-1, -1), located at the center; delta represents a value optionally added to the pixel before storing the target image, with a default value of 0; the border type indicates a border mode.
FIG. 7 is a schematic diagram of a profile generated according to FIG. 5 in an embodiment of the present application.
It should be noted that the present application is not limited to Prewitt operator calculation, and other operators such as Robert operator and Sobel operator may also be used.
The monitoring method further includes, after step S200: and S300, calculating the area of the water seepage patch according to the contour.
The control unit 7 cuts out the grayscale image in the outline in fig. 7, the grayscale image being as shown in fig. 8, and calculates the area of the outline. Specifically, for the collected gray level image, the boundary point of the target area image is obtained by using an edge detection algorithm, and the area of the contour is calculated through the boundary point.
The area of the outline is the image area, a certain proportional relation exists between the area of the outline and the area of the actual water-seeping patch, the proportional coefficient is determined by lens parameters, and the proportional coefficient k can be preset, so that the area of the water-seeping patch is set as the product of the area of the outline and the coefficient k, and then the area of the water-seeping ink area is subtracted, of course, the area of the water-seeping ink area is also preset or known, and the area of the water-seeping ink area is the actual area of the water-seeping ink area 32 in the shape of a rectangular frame in fig. 2.
The monitoring method further includes step S400 after step S300, determining whether the area of the water-seepage patch is 0.
According to the formula, if the area of the water-seepage patch is not 0, the step S500 is performed to determine whether the area of the water-seepage patch is larger than a first preset area threshold, and if the area of the water-seepage patch is larger than the first preset area threshold, the power battery is determined to seep water. In addition, the first step isThe preset area threshold is data pre-stored in the control unit 7. For example, if the calculated patch area is 0.5cm2The first preset area threshold is 0.3cm2And indicating that the power battery is subjected to water seepage.
It should be noted that, after step S400, the method further includes: and S401, if the area of the water seepage patch is 0, determining that the power battery does not seep water.
Step S401 further includes: and step S402, returning to the step S100 after the interval T1 is long, and obtaining black and white images of the area to be monitored of the test paper.
In the embodiment of the application, the time period T1 is 1 minute, that is, from the time when step S100 is first performed to obtain the black-and-white image of the region to be monitored of the test paper, step S401 is completed, and if the area of the water-permeable patch is 0, it is determined that the power battery is not permeable, and the step S402 is repeated after the time period T1, and the step S100 is repeated to obtain the black-and-white image of the region to be monitored of the test paper. The completion time of the processes S100-S402 can be controlled to be in millimeter level, the time of one minute is actually to wait for determining whether water seepage occurs again, in other words, if water seepage occurs, a large water seepage patch can appear in the time of one minute, and the step S100 is performed again after one minute to obtain a black-and-white image of the region to be monitored of the test paper. The power battery can not be penetrated by external water in most of time, so that the monitoring process is maintained for a long time, the operation is saved, and excessive electric energy is not consumed for monitoring.
It should be noted that the time period of T1 may also be a random time period of 1-10 minutes, and the embodiment of the present application is not limited thereto.
It should be noted that, after the step S500 of determining whether the area of the water-seepage patch is greater than the first preset area threshold, the method further includes returning to the step S401 of determining that the power battery does not seep water if the area of the water-seepage patch is not greater than the first preset area threshold, and continuing to perform the step S402, which is not described in detail later.
It should be noted that, after determining that the power battery has water seepage, the method further includes: and step S600, turning on a first alarm.
In the embodiment of the present application, the first alarm is implemented by the alarm device 6, and the alarm device 6 may be an alarm light which is turned on when the power battery is saturated with water. Further, the alarm lamp is red, namely when the alarm lamp is red, the power battery is seeped.
It should be noted that the alarm device 6 may also be a speaker, which sounds when the power battery is saturated with water. Furthermore, the sound of the loudspeaker is 'tic-beep-tic-beep', namely, the power battery is soaked when the loudspeaker sounds 'tic-beep-tic-beep'.
According to the monitoring method provided by the embodiment, the black and white image of the area to be monitored is obtained, a high-quality image pickup device is not needed, and the monitoring cost is reduced; if water seepage occurs, water seepage patches can appear in a shot image of the test paper, whether water seepage of the power battery occurs or not is judged by calculating the area of the water seepage patches and comparing the area of the water seepage patches with a first preset area threshold value, the power battery is prevented from being detached, and the monitoring cost is further reduced.
Example two
A flow chart of the power battery water seepage monitoring method provided by the second embodiment is shown in fig. 9, and the second embodiment is an improvement on the basis of the first embodiment, and the monitoring method includes: and S1000, acquiring a black-and-white image of the area to be monitored of the test paper.
Specifically, the test paper 3 is shot by the shooting device 4, the test paper 3 is focused on the CMOS through a lens of the shooting device 4, the CMOS is composed of a plurality of pixel points, each pixel is composed of a light emitting diode and a related circuit, the diode converts light into electric charge, the total amount of the collected electric charge is in a certain proportion to the intensity of the light, the accumulated electric charge is transmitted to the control unit 7 under the control of the mutual circuit, and a shot image of the test paper 3 is obtained after filtering, amplification and DSP processing, and the shot image is a black-and-white image.
If there is no water seepage, the black-white image presents a white background color area 31 and a black rectangular frame-shaped water-color-changeable ink area 32. If the power battery is permeated, water flows into the inner surface of the battery end plate 11 from the connector jack and firstly permeates into the color-changing ink area 32 of the test paper 3, the water-diffusing ink area 32 of the test paper 3 irreversibly diffuses in the ground color area 31 to form a water-permeated patch 33 (as shown in fig. 3), and a color block with gray scale also appears in a black-and-white image at the moment, as shown in fig. 5.
The monitoring method further includes, after step S1000: s2000, generating the contour of the black-and-white image according to the black-and-white image.
Specifically, the control unit 7 generates the contour by using a Prewitt operator, and the Prewitt operator has the following calculation formula:
referring to fig. 6 in the first embodiment, the template of the Prewitt operator in the second embodiment of the present application may be the gradient g in the x and y directions at the pixel point P5xAnd gyRespectively calculated as:
and defining a template through Numpy, calling a filter2D () function of OpenCV to realize convolution operation on the image, and finally realizing edge extraction through convertScaleabs () and addWeighted () functions. The filter2D () function usage is as follows:
dst＝filter2D(src,ddepth,kernel[,dst[,anchor[,delta[,borderType]]]])
wherein the parameter src represents an input image; dst represents an output edge map, and the size and the number of channels of the output edge map are the same as those of the input image; ddepth represents the required depth of the target image; kernel represents a convolution kernel, a single-channel floating-point type matrix; anchor represents the reference point of the kernel, with default value (-1, -1), located at the center; delta represents a value optionally added to the pixel before storing the target image, with a default value of 0; the border type indicates a border mode.
Referring to fig. 7 in the first embodiment, fig. 7 is a schematic diagram of an outline generated from the black-and-white image shown in fig. 5.
It should be noted that the present application is not limited to Prewitt operator calculation, and other operators such as Robert operator and Sobel operator may also be used.
The monitoring method further includes, after step S2000: and S3000, calculating the area of the water seepage patch according to the contour.
The control unit 7 cuts out the grayscale image in the outline in fig. 7, the grayscale image being as shown in fig. 8 in embodiment one, and calculates the area of the outline. Specifically, for the collected gray level image, the boundary point of the target area image is obtained by using an edge detection algorithm, and the area of the contour is calculated through the boundary point.
The area of the outline is the image area, a certain proportional relation exists between the area of the outline and the area of the actual water-seeping patch, the proportional coefficient is determined by lens parameters, and the proportional coefficient k can be preset, so that the area of the water-seeping patch is set as the product of the area of the outline and the coefficient k minus the area of the water-dispersible ink area.
The monitoring method further includes, after step S3000: and step S4000, judging whether the area of the water seepage patch is 0.
Further, after the step S4000 of determining whether the area of the water-seeping patch is 0, the method further includes: and step S4001, if the area of the water seepage patch is 0, determining that the power battery does not seep water.
Step S4001 is followed by: and step S4002, returning to step S1000 after the interval T1 is long, and acquiring a black-and-white image of the area to be monitored of the test paper.
In the second embodiment of the present application, the time period T1 is 2 minutes, that is, from the time when step S1000 is performed for the first time, the black and white image of the region to be monitored of the test paper is obtained, and step S4001 is completed, if the area of the water-permeable patch is 0, it is determined that the power battery is not permeable to water, and the step S1000 is performed again after the time interval T1 is elapsed, and the black and white image of the region to be monitored of the test paper is obtained. The completion time of the S1000-S4002 process can be controlled to be in millimeter level, the time of two minutes is actually to judge whether water seepage occurs again after waiting, and the step S1000 is carried out again after two minutes to obtain a black-and-white image of the area to be monitored of the test paper. The power battery can not be penetrated by external water in most of time, so that the monitoring process is maintained for a long time, the operation is saved, and excessive electric energy is not consumed for monitoring.
It should be noted that the time period of T1 may also be a random time period of 1-10 minutes, and the embodiment of the present application is not limited thereto.
If the area of the water-seepage patch is not 0, the process proceeds to step S5000, and it is continuously determined whether the area of the water-seepage patch is smaller than a second preset area threshold. If the area of the water seepage patch is smaller than a second preset area threshold value. If the area of the water-seepage patch is smaller than the second preset area threshold, entering a judging step S600, and judging whether the repetition frequency reaches N times, wherein in the second embodiment, N is defined as 5, namely when the area of the water-seepage patch is judged to be smaller than the second preset area threshold for the first time, the judging repetition frequency is 1 and does not reach 5, entering a step S7000, after the time interval T2, returning to the step S1000, and obtaining a black-and-white image of the area to be monitored of the test paper, at the moment, passing through a step S2000, a step S3000 and a step S4000 again, if the area of the water-seepage patch is still smaller than the second preset area threshold, at the moment, judging the repetition frequency is 2 and still does not reach 5, continuing to repeat the steps until the judging frequency is 5, entering a step S8000, judging whether the water-seepage area is smaller than the preset area threshold again, and if the water-seepage area is smaller than the second preset area threshold, then, the process proceeds to step S9000, where a second alarm is activated, and the second alarm is distinguished from the first alarm, and if the first alarm sounds "tic-beep" for the alarm device 6, the second alarm may sound "beep" for the alarm device 6.
It should be noted that the water permeability of the power battery, which is water impermeable, water permeable or slightly water permeable, is a self-contained property, if the water permeability of the power battery is poor, if the casing 1 meets water, the area of the water permeable patch is inevitably larger than the first preset area threshold within a certain time, if the water permeability of the power battery is general, if the casing 1 meets water, the area of the water permeable patch will be close to or equal to the second preset area threshold within a certain time, and then no change will occur, which is also called as slight water permeability. If the third-time water-seepage patch area is not zero and is greater than the second predetermined area threshold, it can be understood that the stage from step S500 to step S401 in the first embodiment and the subsequent steps will be performed, and when the third-time water-seepage patch area is circulated to step S500 in the first embodiment again, the water seepage area is inevitably greater than the first predetermined area threshold, and at this time, it can be determined that the power battery has water seepage. Therefore, the first preset area threshold and the second preset area threshold are safety values designed in advance, and after the two values are set, the method can meet the judgment accuracy of water seepage or slight water seepage.
Note that the duration of T1 is greater than the duration of T2. In the second embodiment, the duration range of the time period of T2 can be set to 3-5 seconds, on one hand, after water enters, a process is required for the infiltration test paper 3 to generate water infiltration plaques, and if the speed of T2 is too high, the water infiltration or slight water infiltration process is not completed, so that misjudgment is easily generated; if the speed of T2 is too slow, more external water may enter the power battery, causing the power battery to be short-circuited and damaged, and it is meaningless to judge again at this moment.
The monitoring method provided by the second embodiment reduces the monitoring cost by acquiring the black and white image of the area to be monitored without adopting a high-quality image pickup device; if water seepage occurs, water seepage patches can appear in a shot image of the test paper, whether the power battery seeps water or not is judged by calculating the area of the water seepage patches and comparing the area of the water seepage patches with a first preset area threshold value, the power battery is prevented from being detached, the monitoring cost is further reduced, meanwhile, whether the power battery is slightly seeped water or not can be judged by the monitoring method, and if the water seepage is slight, a second alarm can be given to remind a maintainer to take remedial measures in time.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A power battery water seepage monitoring method is characterized by comprising the following steps:
acquiring a black-and-white image of a region to be monitored of the test paper;
generating an outline of the black-and-white image according to the black-and-white image;
calculating the area of the water seepage patch according to the contour;
judging whether the area of the water seepage patch is 0 or not;
if not, judging whether the area of the water seepage patch is larger than a first preset area threshold value or not, and if the area of the water seepage patch is larger than the first preset area threshold value, judging that the power battery seeps water.
2. The power battery water seepage monitoring method according to claim 1, wherein a bottom color area and a water-diffusing ink area are arranged on the surface of the test paper, the water-diffusing ink area is arranged around the inner edge of the area to be monitored, and after the test paper is in water, the water-diffusing ink area irreversibly diffuses in the bottom color area and forms the water seepage patch.
3. The power battery water seepage monitoring method according to claim 2, wherein in the step of generating the contour of the black and white image according to the black and white image, the contour is generated by calculation with a Prewitt operator.
4. The power cell seepage monitoring method according to claim 3, wherein the step of calculating the seepage patch area according to the profile comprises:
the water-permeable patch area is set to be the product of the outline area and the coefficient k, and the area of the water-permeable ink area is subtracted.
5. The power battery water seepage monitoring method according to claim 4, wherein the step of judging whether the area of the water seepage patch is 0 further comprises the following steps:
if the area of the water seepage patch is 0, judging that the power battery does not seep water;
and returning to the step to obtain a black-and-white image of the area to be monitored of the test paper after the interval T1 is long.
6. The power battery water seepage monitoring method according to claim 4, wherein the step of judging whether the area of the water seepage patch is 0 further comprises the following steps:
if not, judging whether the area of the water seepage patch is larger than a first preset area threshold value or not, and if the area of the water seepage patch is smaller than the first preset area threshold value, entering the step to judge that the power battery does not seep water.
7. The power battery water seepage monitoring method according to any one of claims 1-6, wherein the step of determining water seepage of the power battery further comprises:
a first alarm is initiated.
8. The power battery water seepage monitoring method according to claim 7, wherein the step of judging whether the area of the water seepage patch is 0 further comprises the following steps:
judging whether the area of the water seepage patch is smaller than a second preset area threshold value or not;
if the area of the water seepage patch is smaller than the second preset area threshold value, judging whether the repetition times reach N times or not;
if the repetition times reach N times, judging whether the area of the water seepage patch is smaller than the second preset area threshold value again;
and if the area of the water seepage patch is smaller than the second preset area threshold value, judging that the power battery slightly seeps water.
9. The power battery water seepage monitoring method according to claim 8, wherein if the water seepage patch area is smaller than the second preset area threshold, the step of determining whether the number of repetitions reaches N times further comprises:
and if the repetition times are less than N times, returning to the step to obtain the black-and-white image of the area to be monitored of the test paper after the interval T2 is long.
10. The power battery water seepage monitoring method according to claim 8, wherein the step of determining that the power battery is slightly water seepage further comprises: turning on a second alarm; and the second alarm is distinct from the first alarm.
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| CN202011582302.6A CN112614115B (en) | 2020-12-28 | 2020-12-28 | Power battery water seepage monitoring method |
| PCT/CN2021/140774 WO2022143391A1 (en) | 2020-12-28 | 2021-12-23 | Power battery water seepage monitoring method and device, control unit, and medium |
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| WO2022143391A1 (en) * | 2020-12-28 | 2022-07-07 | 中国第一汽车股份有限公司 | Power battery water seepage monitoring method and device, control unit, and medium |
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| WO2022143391A1 (en) | 2022-07-07 |
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