CN112614115B - Power battery water seepage monitoring method - Google Patents
Power battery water seepage monitoring method Download PDFInfo
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- CN112614115B CN112614115B CN202011582302.6A CN202011582302A CN112614115B CN 112614115 B CN112614115 B CN 112614115B CN 202011582302 A CN202011582302 A CN 202011582302A CN 112614115 B CN112614115 B CN 112614115B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 179
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Classifications
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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
-
- 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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
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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 plaque according to the outline; judging whether the area of the water seepage plaque is 0; if not, judging whether the area of the water seepage plaque is larger than a first preset area threshold, and if so, judging that the power battery seeps water. The black-and-white image of the area to be monitored is acquired, a high-image-quality camera device is not needed, and the monitoring cost is reduced; if water seepage occurs, water seepage plaque can appear in the photographed image of the test paper, the area of the water seepage plaque is calculated, and whether the power battery seeps or not is judged by comparing the area of the water seepage plaque with a first preset area threshold value, so that the power battery is prevented from being disassembled, and the monitoring cost is further reduced.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a water seepage monitoring method for a power battery.
Background
With the high-speed development of the power battery technology, the endurance of the battery is continuously improved, the sales of the electric automobile is increased year by year, and the safety concern on the electric automobile is also continuously increased, especially the problem of high-voltage insulation, and is more important for the high-voltage safety of the electric automobile. The electric vehicle power battery assembly is fed with water to a certain extent, so that the insulation problem is caused, and further safety accidents are caused. Therefore, the design scheme and the monitoring method aiming at sealing and waterproofing of the power battery assembly are more and more, but the monitoring of the air tightness is concentrated in the qualified monitoring items of the power battery assembly when leaving the factory, the design of the monitoring of the air tightness of the electric vehicle in the use process is very small, and the problems of torque attenuation, ageing of sealing elements and the like are easily caused by long-term use along with the increase of the service life of the battery vehicle, so that the problems of sealing performance reduction and even insulation faults caused by water inflow of the power battery assembly are further caused.
The battery end plate is provided with a high-voltage connector socket and a low-voltage connector socket which are used for connecting a high-voltage wire harness and a low-voltage wire harness, the socket is connected with a connecting bolt of the end plate, and the socket and the end plate are sealed by pressing a sealing ring on the socket. After the vehicle runs for a certain time, when the sealing structure is aged, the bolt torque is insufficient or decays, and the high-voltage connector leaks, the sealing of the battery end plate is not up to the standard, and the high-voltage safety problem is caused by water inflow in the battery pack.
Although the prior art has an insulation monitoring function, when the specificity of the water inlet point of the battery pack or the water inflow is smaller and does not reach a set insulation alarm threshold value, or a known high-voltage system has a water seepage condition but cannot judge whether the inside of the battery pack has water seepage, the battery box shell needs to be destroyed by means of cutting and the like to confirm the water seepage condition in the battery pack, the water seepage confirming means has high cost, and for an individual user, if the inside of the battery pack is confirmed to have no water seepage phenomenon after the battery pack is cut, the user still needs to pay new battery box cost, labor cost and the like, and the maintenance period is long, so that the user complains easily.
On the other hand, if only slight water seepage occurs at the end part of the battery, the service life of the battery can be greatly prolonged if remedial measures can be timely adopted, and unnecessary maintenance cost can be avoided.
Disclosure of Invention
The invention aims to provide a power battery water seepage monitoring method for solving the problem of high battery water seepage monitoring cost.
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 the outline of the black-and-white image according to the black-and-white image;
calculating the area of the water seepage plaque according to the outline;
judging whether the area of the water seepage plaque is 0;
if not, judging whether the area of the water seepage plaque is larger than a first preset area threshold, and if so, judging that the power battery seeps water.
As the preferable scheme of the power battery water seepage monitoring method, the surface of the test paper is provided with a ground color area and a water diffusion ink area, the water diffusion ink area is surrounded on the inner edge of the area to be monitored, and after the test paper encounters water, the water diffusion ink area irreversibly diffuses in the ground color area and forms the water seepage plaque.
In the above-mentioned preferred embodiment of the method for monitoring water seepage of a power battery, in the step of generating the contour of the black-and-white image according to the black-and-white image, a Prewitt operator is adopted to calculate and generate the contour.
As a preferable mode of the above power battery water seepage monitoring method, the step of calculating the water seepage plaque area according to the profile includes:
and the area of the water seepage patch is set to be the product of the contour area and the coefficient k, and the area of the water-diffusion ink area is subtracted.
As a preferable scheme of the power battery water seepage monitoring method, the step of judging whether the area of the water seepage plaque is 0 further comprises:
if the area of the water seepage plaque is 0, judging that the power battery is impermeable;
and returning to the step after the interval T1 to acquire a black-and-white image of the area to be monitored of the test paper.
As a preferable scheme of the power battery water seepage monitoring method, the step of judging whether the area of the water seepage plaque is 0 further comprises:
if not, judging whether the area of the water seepage plaque is larger than a first preset area threshold, and if so, entering the step to judge that the power battery is impermeable.
As a preferable scheme of the power battery water seepage monitoring method, the step of judging that the power battery water seepage further comprises:
a first alarm is activated.
As a preferable scheme of the power battery water seepage monitoring method, the step of judging whether the area of the water seepage plaque is 0 further comprises:
judging whether the area of the water seepage plaque is smaller than a second preset area threshold value or not;
if the area of the water seepage plaque is smaller than the second preset area threshold, judging whether the repetition number reaches N times or not;
if the repetition times reach N times, judging whether the area of the water seepage plaque is smaller than the second preset area threshold value or not again;
and if the area of the water seepage plaque is smaller than the second preset area threshold, judging that the power battery is slightly water-seeped.
As a preferred solution of the above power battery water seepage monitoring method, if the area of the water seepage plaque is smaller than the second preset area threshold, the step of judging whether the repetition number reaches N times further includes:
if the repetition times are less than N times, returning to the step after the interval T2 to acquire the black-white image of the area to be monitored of the test paper.
As a preferable scheme of the above power battery water seepage monitoring method, the step of determining that the power battery is slightly water-permeable further includes: 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 acquired, a high-image-quality camera device is not needed, and the monitoring cost is reduced; if water seepage occurs, water seepage plaque can appear in the photographed image of the test paper, the area of the water seepage plaque is calculated, and whether the power battery seeps or not is judged by comparing the area of the water seepage plaque with a first preset area threshold value, so that the power battery is prevented from being disassembled, and the monitoring cost is further reduced.
Drawings
Fig. 1 is a schematic view of a power cell according to an embodiment of the present application from a first perspective;
fig. 2 is a schematic structural view of a second view of a power cell in accordance with an embodiment of the present application;
FIG. 3 is a schematic diagram of a test paper after water diffusion in a water-diffusion ink zone according to the present application;
fig. 4 is a flowchart of a method for monitoring water seepage of a power battery according to an embodiment of the present application;
FIG. 5 is a black and white image of a region to be detected of a test strip according to an embodiment of the present application;
FIG. 6 is a template of a Prewitt operator of embodiment one of the present application;
FIG. 7 is a schematic illustration 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 gray scale image taken in the outline of FIG. 7 according to one embodiment of the present application;
fig. 9 is a flowchart of a method for monitoring water seepage of a power battery according to a second embodiment of the present application.
In the figure:
1-a housing; 11-cell end plates;
2-connector sockets;
3-test paper; 31-a ground color zone; 32-a water-spreading ink zone; 33-water permeable plaque;
4-a photographing device;
5-darkroom lamp;
6-an alarm device;
7-a control unit.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
The power battery water seepage monitoring method is applied to a power battery, and as shown in fig. 1 and 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.
The casing 1 is the cuboid structure, and battery end plate 11 is established to one of them side of casing 1, can understand battery end plate 11 as the rectangular plate, and a connector jack has been seted up to battery end plate 11, and in this application embodiment, the connector jack is the rectangle and sets up at the middle part of battery end plate 11, and four directions all leave certain clearance with battery end plate 11 about the connector jack about, connector socket 2 sets up in the connector jack.
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, the whole is symmetrical and looks beautiful.
It should be noted that, in the embodiment of the present application, in order to monitor the water seepage substance, the water seepage property between the connector socket 2 and the connector jack is monitored, so 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 will be understood that the housing 1 may have no gaps in other positions than between the connector jack and the connector socket 2. On the other hand, if the power cell is to monitor water permeability at other locations, the test paper 3 may be provided in the corresponding place. The present invention is not limited thereto.
The test paper 3 is arranged on the inner surface of the battery end plate 11, and the test paper 3 is arranged on the periphery of the connector socket 2 in a surrounding mode, and the test paper 3 is connected with the edge of the connector jack in a sealing mode.
The test paper 3 is a test paper which changes color when meeting water, and the test paper 3 does not change color when meeting water vapor. In this embodiment of the present application, the surface of the test paper 3 is provided with a ground color area 31 and a water-diffusion ink area 32, the water-diffusion ink area 32 is enclosed at the inner edge of the area to be monitored, the ground color area 31 has a first color, and the water-diffusion ink area 32 has a second color. In the present embodiment, the first color is white, i.e., the ground color region 31 is white; the second color is black, that is, the water-diffusion ink region 32 is black, when the test paper 3 encounters water, the water-diffusion ink region 32 irreversibly diffuses in the ground color region 31 and forms a water-permeable patch 33, and fig. 3 is a schematic diagram of the test paper 3 after the water-diffusion ink region 32 diffuses in water.
The photographing device 4 is disposed inside the casing 1 and faces the test paper 3, and it should be noted that the photographing area of the photographing 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 the test paper 3 has a water seepage plaque, the photographing device 4 can take a picture of the water seepage plaque. Meanwhile, the area to be monitored in the embodiment of the present application does not cover the whole test paper 3, but only a preset certain area, so that the calculation amount in the later period can be reduced, and it should be noted that the photographing device 4 is a black-and-white lens and integrates a black-and-white CMOS sensor (Complementary Metal-Oxide-Semiconductor, CMOS).
A darkroom lamp 5 is provided inside the housing 1 and is capable of illuminating at least the test paper 3. In the embodiment of the present application, the light emitted by the darkroom lamp 5 is red, 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 manufacture 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 how to realize the water seepage monitoring between the devices is continued to see the following method for monitoring the water seepage of the power battery.
Example 1
A flow chart of a method for monitoring water seepage of a power battery provided in the first embodiment is shown in FIG. 4, and the method comprises the following steps: s100, acquiring a black-and-white image of a region to be monitored of the test paper.
Specifically, the photographing device 4 photographs the test paper 3, the test paper 3 is focused on the CMOS through the lens of the photographing device 4, the CMOS is composed of a plurality of pixels, 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 related circuit, and a photographed image of the test paper 3 is obtained after filtering, amplifying and DSP processing, and the photographed image is a black-and-white image.
If no water seepage exists, the black-and-white image presents a white background color area 31 and a black rectangular frame-shaped water-color-changeable ink area 32. If water seepage exists in the power battery, 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-diffusion ink area 32 of the test paper 3 irreversibly diffuses in the ground color area 31 and forms a water seepage patch 33 (shown in fig. 3), and color blocks with gray scale also appear in a black-and-white image at the moment, as shown in fig. 5.
The monitoring method further comprises, after step S100: s200, generating the outline 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 calculation formula as follows:
FIG. 6 is a template of the Prewitt operator of the first embodiment of the present application, gradient g in the x and y directions at pixel point P5 x And g y The calculation is as follows:
and (3) through a Numpy definition template, calling a filter2D () function of OpenCV to realize convolution operation on the image, and finally realizing edge extraction through convertScaleAbs () and addweight () functions. The filter2D () function usage is as follows:
dst＝filter2D(src,ddepth,kernel[,dst[,anchor[,delta[,borderType]]]])
wherein the parameter src represents the input image; dst represents the output edge map, which is the same size and channel number as the input image; ddepth represents the depth required for the target image; kernel represents a convolution kernel, a single-channel floating-point matrix; anchor represents a reference point of the kernel, with a default value (-1, -1), located at the center; delta represents a value optionally added to a pixel prior to storing the target image, with a default value of 0; borderType represents a bezel mode.
Fig. 7 is a schematic view of a profile generated according to fig. 5 according to 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, sobel operator, etc. may be used.
The monitoring method further comprises, after step S200: s300, calculating the area of the water seepage plaque according to the outline.
The control unit 7 intercepts a gray-scale image in the contour in fig. 7, the gray-scale image being as shown in fig. 8, and calculates the area of the contour. Specifically, for the collected gray level image, boundary points of the target area image are obtained by using an edge detection algorithm, and the area of the contour is calculated through the boundary points.
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 permeable patch, the proportionality coefficient is determined by the lens parameter, and the proportionality coefficient k is preset, so that the area of the water permeable patch is set to be the product of the area of the outline and the coefficient k, and the area of the water-diffusion ink-contacting area is subtracted, and of course, the area of the water-diffusion ink-contacting area is preset or known, and the area of the water-diffusion ink-contacting area is the actual area of the rectangular frame-shaped water-diffusion area 32 in fig. 2.
The monitoring method further comprises a step S400 of judging whether the area of the water seepage plaque is 0 after the step S300.
According to the above formula, if the area of the water permeable patch is not 0, step S500 is entered to determine whether the area of the water permeable patch is greater than the first preset area threshold, and if the area of the water permeable patch is greater than the first preset area threshold, water permeability of the power battery is determined. It should be noted that the first preset area threshold value is data pre-stored in the control unit 7. For example, if the area of the water-permeable spot is calculated to be 0.5cm 2 The first preset area threshold is 0.3cm 2 And the power battery is indicated to have water seepage.
It should be noted that, after step S400, further includes: and step S401, if the area of the water seepage plaque is 0, judging that the power battery is impermeable.
Step S401 further includes: and step S402, returning to the step S100 after the interval T1, and acquiring black and white images of the area to be monitored of the test paper.
In this embodiment of the present application, the duration T1 is 1 minute, that is, from the first execution of step S100, the acquisition of the black-and-white image of the area to be monitored of the test paper, and the completion of step S401, if the area of the water permeable plaque is 0, it is determined that the power battery is impermeable to water, and then the power battery returns to step S402 after the duration T1 is spaced, and the black-and-white image of the area to be monitored of the test paper is acquired. Because the finishing time of the process S100-S402 can be controlled at millimeter level, the time of one minute is actually waiting for determining whether water seepage occurs again, in other words, if water seepage occurs, a larger water seepage plaque can appear in the time of one minute, and the step S100 is performed again after one minute, so as to obtain a black-white image of the area to be monitored of the test paper. Because the power battery can not be penetrated by external water most of the time, 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 duration of T1 may also be a random duration of 1-10 minutes, and the embodiment of the present application is not limited thereto.
It should be noted that, after the step S500 is performed to determine whether the area of the water permeable plaque is greater than the first preset area threshold, if the area of the water permeable plaque is not greater than the first preset area threshold, the step S401 is returned to, and the step S402 is performed continuously, which is not repeated.
It should be noted that, after determining that the power battery is water permeable, the method further includes: step S600, turn on the first alarm.
In this embodiment, the first alarm is implemented by the alarm device 6, and the alarm device 6 may be an alarm lamp, and the alarm lamp is turned on when the power battery permeates water. Further, the warning light is red, i.e. when the warning light is lit red, the power battery is indicated to be permeable.
The alarm device 6 may be a speaker, and the speaker sounds when the power battery permeates water. Further, the speaker sounds "beep-beep", i.e., when the speaker sounds "beep-beep", it indicates that the power battery is leaking water.
According to the monitoring method provided by the first embodiment, the black-and-white image of the area to be monitored is obtained, a high-image-quality camera device is not needed, and the monitoring cost is reduced; if water seepage occurs, water seepage plaque can appear in the photographed image of the test paper, the area of the water seepage plaque is calculated, and whether the power battery seeps or not is judged by comparing the area of the water seepage plaque with a first preset area threshold value, so that the power battery is prevented from being disassembled, and the monitoring cost is further reduced.
Example two
The flow chart of the power battery water seepage monitoring method provided in the second embodiment is shown in fig. 9, and the second embodiment is an improvement based on the first embodiment, and the monitoring method comprises the following steps: s1000, acquiring a black-and-white image of a region to be monitored of the test paper.
Specifically, the photographing device 4 photographs the test paper 3, the test paper 3 is focused on the CMOS through the lens of the photographing device 4, the CMOS is composed of a plurality of pixels, 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 related circuit, and a photographed image of the test paper 3 is obtained after filtering, amplifying and DSP processing, and the photographed image is a black-and-white image.
If no water seepage exists, the black-and-white image presents a white background color area 31 and a black rectangular frame-shaped water-color-changeable ink area 32. If water seepage exists in the power battery, 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-diffusion ink area 32 of the test paper 3 irreversibly diffuses in the ground color area 31 and forms a water seepage patch 33 (shown in fig. 3), and color blocks with gray scale also appear in a black-and-white image at the moment, as shown in fig. 5.
The monitoring method further comprises the following steps after the step S1000: s2000, generating the outline 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 calculation formula as follows:
the template of the Prewitt operator of the second embodiment of the present application can be seen in fig. 6 of the first embodiment, in which the gradient g is in the x and y directions at the pixel point P5 x And g y The calculation is as follows:
and (3) through a Numpy definition template, calling a filter2D () function of OpenCV to realize convolution operation on the image, and finally realizing edge extraction through convertScaleAbs () and addweight () functions. The filter2D () function usage is as follows:
dst＝filter2D(src,ddepth,kernel[,dst[,anchor[,delta[,borderType]]]])
wherein the parameter src represents the input image; dst represents the output edge map, which is the same size and channel number as the input image; ddepth represents the depth required for the target image; kernel represents a convolution kernel, a single-channel floating-point matrix; anchor represents a reference point of the kernel, with a default value (-1, -1), located at the center; delta represents a value optionally added to a pixel prior to storing the target image, with a default value of 0; borderType represents a bezel 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, sobel operator, etc. may be used.
The monitoring method further comprises the following steps after the step S2000: s3000, calculating the area of the water seepage plaque according to the outline.
The control unit 7 intercepts a gradation image in the outline in fig. 7, the gradation image being as shown in fig. 8 in the first embodiment, and calculates the area of the outline. Specifically, for the collected gray level image, boundary points of the target area image are obtained by using an edge detection algorithm, and the area of the contour is calculated through the boundary points.
The area of the outline is the image area, a certain proportion relation exists between the area of the outline and the area of the actual water seepage patch, the proportion coefficient is determined by lens parameters, and the proportion coefficient k can be preset, so that the area of the water seepage patch is set to be the product of the area of the outline and the area of the coefficient k minus the area of the water diffusion ink area.
The monitoring method further comprises the following steps after the step S3000: and S4000, judging whether the area of the water seepage plaque is 0.
Further, step S4000 further includes, after determining whether the area of the water permeable plaque is 0: step S4001, if the area of the water permeable plaque is 0, determining that the power battery is impermeable.
Step S4001 further comprises: step S4002, after the interval T1, returning to step S1000, and acquiring black and white images of the area to be monitored of the test paper.
In the second embodiment of the present application, the duration T1 is 2 minutes, that is, from the first execution of step S1000, the acquisition of the black-and-white image of the area to be monitored of the test paper, and the completion of step S4001, if the area of the water permeable plaque is 0, it is determined that the power battery is impermeable to water, and then the power battery returns to step S4002 after the duration of interval T1, and the black-and-white image of the area to be monitored of the test paper is acquired. Because the finishing time of the S1000-S4002 process can be controlled at millimeter level, the time of two minutes is actually waiting for judging whether water seepage occurs again, and the S1000 step is carried out again after two minutes, so that the black-white image of the area to be monitored of the test paper is obtained. Because the power battery can not be penetrated by external water most of the time, 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 duration of T1 may also be a random duration of 1-10 minutes, and the embodiment of the present application is not limited thereto.
If the area of the water permeable plaque is not 0, the step S5000 is entered, and whether the area of the water permeable plaque is smaller than the second preset area threshold is continuously determined. If the area of the water seepage plaque is smaller than the second preset area threshold value. If the area of the water permeable patch is smaller than the second preset area threshold, the step S600 is entered, and whether the repetition number is N times is judged, in the second embodiment, N is defined as 5, that is, when the first time that the area of the water permeable patch is smaller than the second preset area threshold is judged, the repetition number is 1 and is not 5, the step S7000 is entered, the step T2 is entered, the step S1000 is returned after the interval, the black-and-white image of the area to be monitored of the test paper is obtained, at this time, the step S2000 is entered again, the step S3000 is entered again, the step S4000 is entered, if the water permeable patch area is still smaller than the second preset area threshold, the repetition number is judged to be 2 and is not yet 5, the step S8000 is entered, if the number of times is 5, the water permeable area is judged again smaller than the preset area threshold, the step S9000 is judged, the second alarm is started, the second alarm is different from the first alarm, and if the first alarm is the beep-beep sound of the device 6, the beep-beep sound of the second alarm device is beep.
It should be noted that, the water permeability of the power battery, in which no water seepage, water seepage or slight water seepage occurs, is a self-carried attribute, if the water permeability of the power battery is poor, if the casing 1 encounters water, the area of the water seepage plaque is necessarily larger than the first preset area threshold value within a certain time, if the water permeability of the power battery is general, if the casing 1 encounters water, the area of the water seepage plaque will be close to or equal to the second preset area threshold value within a certain time, and then no change will occur, which is also called slight water seepage. If the area of the third water permeable plaque is not zero and is greater than the second preset area threshold, it can be understood that the steps from step S500 to step S401 in the first embodiment and the subsequent steps will be performed, and when the circulation is performed again to step S500 in the first embodiment, the water permeable area will necessarily be greater than the first preset area threshold, and at this time, water permeability of the power battery can be determined. Therefore, the first preset area threshold value and the second preset area threshold value 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.
It should be noted that the duration T1 is longer than the duration T2. In the second embodiment, the duration range of T2 may be set to 3-5 seconds, on the one hand, a process is required for infiltration of the test paper 3 after water inflow, and if the T2 speed is too high, the infiltration or slight infiltration process is not completed, so that erroneous judgment is easy to generate; if the T2 speed is too slow, more external water may enter the power battery, so that the power battery is short-circuited and damaged, and the judgment is not meaningful.
According to the monitoring method provided by the second embodiment, the black-and-white image of the area to be monitored is obtained, a high-image-quality camera device is not needed, and the monitoring cost is reduced; if water seepage occurs, a water seepage plaque can appear in a shooting image of the test paper, the area of the water seepage plaque is calculated, the area of the water seepage plaque is compared with a first preset area threshold value to judge whether water seepage of the power battery occurs, the power battery is prevented from being detached, the monitoring cost is further reduced, meanwhile, the monitoring method can judge whether the power battery is in slight water seepage, and if the power battery is in slight water seepage, a second alarm can be carried out to remind an maintainer to take remedial measures in time.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (8)
1. The power battery water seepage monitoring method is characterized by comprising the following steps of:
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 plaque according to the outline;
judging whether the area of the water seepage plaque is 0;
if not, judging whether the area of the water seepage plaque is larger than a first preset area threshold, and if so, judging that the power battery seeps;
the step of judging that the power battery is water permeable further comprises the following steps:
activating a first alarm;
the step of judging whether the area of the water seepage plaque is 0 further comprises the following steps:
judging whether the area of the water seepage plaque is smaller than a second preset area threshold value or not;
if the area of the water seepage plaque is smaller than the second preset area threshold, judging whether the repetition number reaches N times or not;
if the repetition times reach N times, judging whether the area of the water seepage plaque is smaller than the second preset area threshold value or not again;
and if the area of the water seepage plaque is smaller than the second preset area threshold, judging that the power battery is slightly water-seeped.
2. The method for monitoring water seepage of a power battery according to claim 1, wherein a ground color area and a water-diffusion ink area are arranged on the surface of the test paper, the water-diffusion ink area is arranged on the inner edge of the area to be monitored in a surrounding mode, and after the test paper encounters water, the water-diffusion ink area is irreversibly diffused in the ground color area and forms the water seepage plaque.
3. The method of claim 2, wherein in the step of generating the profile of the black-and-white image from the black-and-white image, a Prewitt operator calculation is used to generate the profile.
4. A method of monitoring water penetration of a power cell according to claim 3, wherein the step of calculating the water penetration plaque area from the profile comprises:
and the area of the water seepage patch is set to be the product of the contour area and the coefficient k, and the area of the water-diffusion ink area is subtracted.
5. The method of claim 4, wherein the step of determining whether the area of the water permeable plaque is 0 further comprises:
if the area of the water seepage plaque is 0, judging that the power battery is impermeable;
and returning to the step after the interval T1 to acquire a black-and-white image of the area to be monitored of the test paper.
6. The method of claim 4, wherein the step of determining whether the area of the water permeable plaque is 0 further comprises:
if not, judging whether the area of the water seepage plaque is larger than a first preset area threshold, and if so, entering the step to judge that the power battery is impermeable.
7. The method according to claim 1, wherein if the area of the water permeable plaque is smaller than the second preset area threshold, the step of determining whether the number of repetitions reaches N further comprises:
if the repetition times are less than N times, returning to the step after the interval T2 to acquire the black-white image of the area to be monitored of the test paper.
8. The method for monitoring water seepage of a power battery according to claim 1, 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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| CN113379690B (en) * | 2021-05-31 | 2023-04-07 | 山东省科学院激光研究所 | Automatic wall seepage detection method and system |
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