WO2022143391A1

WO2022143391A1 - Power battery water seepage monitoring method and device, control unit, and medium

Info

Publication number: WO2022143391A1
Application number: PCT/CN2021/140774
Authority: WO
Inventors: 夏弋茹; 杨振; 王文帅; 郭源科; 何忠青
Original assignee: 中国第一汽车股份有限公司
Priority date: 2020-12-28
Filing date: 2021-12-23
Publication date: 2022-07-07
Also published as: CN112614115A; CN112614115B

Abstract

Disclosed are a power battery water seepage monitoring method and device, a control unit, and a medium. The power battery water seepage monitoring method comprises: acquiring a black-and-white image of a test strip, wherein the black-and-white image is used for showing a water seepage condition of an area to be monitored of the power battery; generating a contour of the black-and-white image according to the black-and-white image; calculating the area of a water seepage spot according to the contour; determining whether the area of the water seepage spot is 0; in response to the area of the water seepage spot being not 0, determining whether the area of the water seepage spot is greater than a first preset area threshold, and in response to the area of the water seepage spot being greater than the first preset area threshold, determining that the power battery has water seepage.

Description

Power battery water seepage monitoring method, device, control unit and medium

This application claims the priority of the Chinese Patent Application No. 202011582302.6 filed with the China Patent Office on December 28, 2020, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the technical field of power batteries, for example, to a method, device, control unit and medium for monitoring water seepage of a power battery.

Background technique

With the rapid development of power battery technology, the battery life has been continuously improved, the sales of electric vehicles have increased year by year, and the safety concerns of electric vehicles are also increasing, especially the high-voltage insulation problem, which is the top priority of high-voltage safety of electric vehicles heavy. To a certain extent, the water ingress of the electric vehicle power battery assembly will cause insulation problems, which will lead to safety accidents. Therefore, there are more and more design schemes and monitoring methods for sealing and waterproofing of power battery assemblies, but the monitoring of air tightness is mostly concentrated in the factory qualified monitoring items of power battery assemblies, aiming at the sealing performance of electric vehicles during use. There are very few monitoring designs, and with the increase in the service life of the battery vehicle, long-term use can easily lead to problems such as torque decay and aging of seals, which in turn lead to the decline of sealing performance and even the problem of insulation failure caused by water ingress of the power battery assembly.

High and low voltage connector sockets are arranged on the battery end plate, which are arranged to connect the high voltage wiring harness and the low voltage wiring harness. After the vehicle runs for a certain period of time, when the sealing structure is aging, the bolt torque is insufficient or attenuated, and the high-voltage connector leaks, it will cause the battery end plate seal to fail to meet the standard, and the water in the battery pack will cause high-voltage safety problems.

Although there is an insulation monitoring function in the current technology, when the location of the water inlet point of the battery pack is special or the water inlet volume is small and does not reach the set insulation alarm threshold, or it is known that there is water seepage in the high-voltage system, but it is impossible to determine whether there is water seepage inside the battery pack , it is necessary to destroy the battery box shell by cutting and other means to confirm the water seepage in the battery pack. The cost of this water seepage confirmation method is too high. For individual users, if there is no water seepage inside the battery pack after cutting, the user still needs to pay. The cost of new battery boxes and labor costs, etc., and the long maintenance cycle, easily cause users to complain. On the other hand, if there is only slight water seepage at the end of the battery, if remedial measures can be taken in time, the service life of the battery can be greatly improved, and unnecessary maintenance costs can also be avoided.

SUMMARY OF THE INVENTION

The purpose of this application is to provide a power battery water seepage monitoring method, device, control unit and medium to solve the problem of high cost of battery water seepage monitoring.

The present application provides a power battery water seepage monitoring method, including:

acquiring a black-and-white image of the test strip, wherein the black-and-white image is used to present the water seepage in the to-be-monitored area of the power battery;

generating the outline of the black and white image according to the black and white image;

Calculate the seepage patch area according to the outline;

Determine whether the area of the seepage patch is 0;

In response to the water seepage patch area not being 0, determine whether the water seepage patch area is greater than a first preset area threshold, and in response to the water seepage patch area being greater than the first preset area threshold, determine the power battery seepage .

As an embodiment of the above-mentioned power battery water seepage monitoring method, the surface of the test paper is provided with a background color area and a water diffusion ink area, and the water diffusion ink area is arranged around the inner edge of the to-be-monitored area, and the test paper After encountering water, the water-diffusing ink area irreversibly diffuses in the base color area and forms the water-seeding patch.

As an embodiment of the above-mentioned power battery water seepage monitoring method, generating the outline of the black and white image according to the black and white image includes:

According to the black and white image, the Prewitt operator is used to calculate and generate the contour.

As an embodiment of the above-mentioned power battery water seepage monitoring method, the calculation of the water seepage patch area according to the outline includes:

The area of the water seepage patch is set as the product of the area of the contour and the coefficient k minus the area of the water diffusion ink area.

As an embodiment of the above-mentioned power battery water seepage monitoring method, after judging whether the water seepage patch area is 0, the method further includes:

In response to the water seepage patch area being 0, it is determined that the power battery does not seep water;

After the interval T1, return to execute the acquisition of the black-and-white image of the test strip.

As an embodiment of the above-mentioned power battery water seepage monitoring method, after judging whether the area of the water seepage patch is greater than the first preset area threshold, the method further includes:

In response to the area of the water seepage patch being less than or equal to the first preset area threshold, returning to perform the acquiring of the black and white image of the test paper after an interval of T1.

As an embodiment of the above-mentioned power battery water seepage monitoring method, after the water seepage of the power battery is determined, the method further includes:

Activate the first alarm.

As an embodiment of the above-mentioned power battery water seepage monitoring method, after the area of the water seepage patch is not 0 in response to the water seepage, the method further includes:

determining whether the area of the seepage patch is smaller than a second preset area threshold;

In response to the water seepage patch area being smaller than the second preset area threshold, determining whether the number of repetitions reaches N times;

In response to the number of repetitions reaching N times, judging again whether the area of the water seepage patch is smaller than the second preset area threshold;

In response to the water seepage patch area being smaller than the second preset area threshold, it is determined that the power battery is slightly water seepage.

As an embodiment of the above-mentioned power battery water seepage monitoring method, after judging whether the number of repetitions reaches N times in response to the water seepage patch area being smaller than the second preset area threshold, the method further includes:

In response to the number of repetitions being less than N times, returning to execute the obtaining of the black and white image of the test strip after an interval of T2.

As an embodiment of the above-mentioned power battery water seepage monitoring method, after determining that the power battery slightly seeps water, the method further includes:

Turn on a second alarm; wherein, and the second alarm is different from the first alarm.

The application provides a power battery water seepage monitoring device, including:

The first module is configured to obtain a black and white image of the test paper, wherein the black and white image is used to present the water seepage in the area to be monitored of the power battery;

a second module, configured to generate the outline of the black and white image according to the black and white image;

The third module is configured to calculate the water seepage patch area according to the outline;

The fourth module is configured to judge whether the area of the seepage patch is 0;

The fifth module is configured to judge whether the area of the seepage patch is greater than a first preset area threshold in response to the area of the seepage patch being not 0, and to respond that the area of the seepage patch is greater than the first preset area Threshold value to determine the water seepage of the power battery.

The present application provides a control unit, including a processor, a memory, and a computer program stored on the memory and executable on the processor, and the processor implements the above-mentioned power battery water seepage monitoring when the computer program is executed. method.

The present application provides a computer storage medium storing a computer program, and when the computer program is executed by a processor, the above-mentioned method for monitoring water seepage of a power battery is implemented.

Description of drawings

1 is a schematic structural diagram of a power battery from a first perspective provided by an embodiment of the present application;

2 is a schematic structural diagram of a power battery from a second perspective provided by an embodiment of the present application;

Fig. 3 is a kind of schematic diagram of the test paper after the water-diffusion ink region encounters water and diffuses according to the embodiment of the present application;

4 is a flowchart of a method for monitoring water seepage in a power battery provided by an embodiment of the present application;

5 is a black and white image of a to-be-detected area of a test paper provided by an embodiment of the present application;

6 is a template of a Prewitt operator provided by an embodiment of the present application;

Fig. 7 is the schematic diagram of the contour generated according to the black and white image shown in Fig. 5;

Fig. 8 is the grayscale image intercepted in the outline of Fig. 7;

9 is a flowchart of another power battery water seepage monitoring method provided by an embodiment of the present application;

10 is a schematic structural diagram of a power battery water seepage monitoring device provided by an embodiment of the present application;

FIG. 11 is a schematic structural diagram of a control unit provided by an embodiment of the present application.

In the picture:

1-shell; 11-battery end plate;

2 - connector socket;

3-test paper; 31-ground color area; 32-water diffusion ink area; 33-water seepage patch;

4- shooting device;

5- Darkroom light;

6-Alarm device;

7- Control unit.

Detailed ways

The present application will be described below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are merely used to explain the present application. For the convenience of description, only the parts related to the present application are shown in the drawings.

In the description of this application, unless otherwise specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral body; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the meanings of the above terms in the present application can be understood according to the situation.

In this application, unless otherwise specified and limited, a first feature "on" or "under" a second feature may include the first and second features in direct contact, or may include the first and second features not directly in contact The contact is made through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this embodiment, the terms "upper", "lower", "right", etc. are based on the orientation or positional relationship shown in the accompanying drawings, which are only for convenience of description and simplified operation, rather than indicating Or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as a limitation of the present application. In addition, the terms "first" and "second" are only used for distinction in description, and have no special meaning.

The water seepage monitoring method for a power battery in the embodiment of the present application is applied to a power battery. As shown in Figures 1 and 2, the power battery includes a casing 1, a connector socket 2, a test paper 3, a photographing device 4, a darkroom lamp 5, Alarm device 6 and control unit 7.

The casing 1 has a cuboid structure, one of the side surfaces of the casing 1 is set as the battery end plate 11, the battery short plate 11 is a rectangular plate, and the battery end plate 11 is provided with a connector jack. In the embodiment of the present application, the connector The socket is rectangular and is arranged in the middle of the battery end plate 11. There are certain gaps between the connector socket and the battery end plate 11 in the four directions of up, down, left and right. The connector socket 2 is arranged in the connector socket.

The geometric center of the connector socket coincides with the geometric center of the battery end plate 11 , and when the connector socket 2 is placed, it is symmetrical as a whole and looks beautiful.

In the embodiment of the present application, monitoring water seepage is essentially monitoring the water seepage performance between the connector socket 2 and the connector jack. Therefore, the area to be monitored is a certain range of the outer periphery of the connector jack, and the area to be monitored is determined by the camera 4 Determine the shooting range. On the one hand, except for the possible gap between the connector socket and the connector socket 2 , the housing 1 has no gap at other positions. On the other hand, if the power battery needs to monitor water permeability in other locations, test strips 3 can be set in the corresponding places. The present application is not limited to this.

The test paper 3 is arranged on the inner surface of the battery end plate 11 , and the test paper 3 is arranged around the outer periphery of the connector socket 2 , and the test paper 3 is sealed with the edge of the connector socket.

The test paper 3 is a water-changing test paper, and the test paper 3 will not change color when it encounters 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 diffusion ink area 32, the water diffusion ink area 32 is arranged around the inner edge of the area to be monitored, and the background color area 31 has a first color, The water-diffusing ink region 32 has a second color. In the embodiment of the present application, the first color is white, that is, the background color area 31 is white; the second color is black, that is, the water-diffusing ink area 32 is black, and when the test paper 3 encounters water, the water-diffusion ink area 32 Irreversible diffusion occurs in the background color area 31 and water seepage patches 33 are formed. FIG. 3 is a schematic diagram of the test paper 3 after the ink area 32 is diffused in contact with water.

The photographing device 4 is arranged inside the housing 1 and faces the test paper 3. 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. Therefore, once the test paper 3 has water seepage patches, the photographing device 4 can take pictures. Watery plaques under. But at the same time, the to-be-monitored area of the embodiment of the present application does not cover the entire test paper 3, but is only a preset certain area, which can reduce the amount of calculation in the later stage. The photographing device 4 is a black and white lens and integrates a black and white complementary metal oxide semiconductor ( Complementary Metal-Oxide-Semiconductor, CMOS) sensor.

The darkroom light 5 is arranged inside the housing 1 and can at least illuminate the test paper 3 . In the embodiment of the present application, the light emitted by the darkroom light 5 is red, and the darkroom light 5 is a red light-emitting diode (Light-Emitting Diode, LED) light.

The alarm device 6 is arranged on the outer surface of the casing 1 , and the control unit 7 is arranged inside the casing 1 and connects the photographing production 4 and the warning device 6 . In addition, a battery body is provided inside the power battery to supply power to multiple devices.

For how to implement water seepage monitoring between multiple devices, please continue to refer to the power battery water seepage monitoring method below.

Example 1

The flowchart of the power battery water seepage monitoring method provided in the first embodiment is shown in FIG. 4 , and the monitoring method includes:

S100. Acquire a black-and-white image of the test strip, where the black-and-white image is used to present the water seepage in the area to be monitored of the power battery.

The photographing device 4 shoots the test paper 3, and 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, and each pixel is composed of a light-emitting diode and related circuits. The diode converts light into electric charges, and the collected The total amount of electric charge is proportional to the light intensity, and the accumulated electric charge is transmitted to the control unit 7 under the control of the mutual circuit, and after filtering, amplification and digital signal processing (Digital Signal Process, DSP) processing, the photographed image of the test paper 3 is obtained, And the captured image is a black and white image.

If there is no water seepage, the black-and-white image presents a white background color area 31 and a black rectangular frame-shaped ink area 32 that changes color upon exposure to water. If there is water seepage in the power battery, the water flows into the inner surface of the battery end plate 11 from the connector jack, and first penetrates into the discolored ink area 32 of the test paper 3, and the water-diffusing ink area 32 of the test paper 3 irreversibly in the background color area 31 Diffusion occurs and water seepage patches 33 are formed (as shown in FIG. 3 ), and at this time, color patches with grayscale also appear in the black and white image, as shown in FIG. 5 .

After step S100, the monitoring method further includes: S200, generating the outline of the black and white image according to the black and white image.

The control unit 7 adopts the Prewitt operator to calculate and generate the contour, and the Prewitt operator calculation formula is as follows:

6 is a template of a Prewitt operator provided by an embodiment of the application, and the gradients g _x and g _y in the x and y directions at the pixel point P5 are calculated as:

The template is defined by Numpy, and then the filter2D() function of OpenCV is called to realize the convolution operation of the image, and finally the edge extraction is realized by the convertScaleAbs() and addWeighted() functions. The filter2D() function usage is as follows:

dst=filter2D(src,ddepth,kernel[,dst[,anchor[,delta[,borderType]]]])

Among them, the parameter src represents the input image; dst represents the output edge map, whose size and number of channels are the same as the input image; ddepth represents the required depth of the target image; kernel represents the convolution kernel, a single-channel floating-point matrix; anchor represents The reference point of the kernel, whose default value is (-1, -1), is located at the center position; delta represents an optional value added to the pixel before storing the target image, the default value is 0; borderType represents the border mode.

FIG. 7 is a schematic diagram of contours generated from the black and white image shown in FIG. 5 .

The present application is not limited to calculating and generating the contour based on the Prewitt operator, and other operators such as the Robert operator and the Sobel operator can also be used to generate the contour.

After step S200, the monitoring method further includes: S300, calculating the water seepage patch area according to the contour.

The control unit 7 intercepts the grayscale image in the contour in FIG. 7 , and the grayscale image is shown in FIG. 8 , and calculates the area of the contour. For the collected grayscale images, the edge detection algorithm is used to obtain the boundary points of the target area image, and the area of the contour is calculated through the boundary points.

The area of the contour is the image area, and there is a certain proportional relationship between it and the area of the actual water seepage patch. The proportional relationship is determined by the lens parameters, and the proportional coefficient k used to characterize the proportional relationship can be preset. , so the area of the water seepage patch is set as the product of the contour area and the coefficient k minus the area of the water diffusion ink area. Of course, the area of the water diffusion ink area is also preset or known. The area of the water diffusion ink area is shown in Figure 2 The actual area of the middle rectangular frame-shaped water diffusion zone 32 .

After step S300, the monitoring method further includes: step S400, judging whether the area of the seepage patch is zero.

If the area of the seepage patch is not 0, enter step S500 to determine whether the area of the seepage patch is greater than the first preset area threshold, and if the area of the seepage patch is greater than the first preset area threshold, determine that the power battery sees water. The first preset area threshold is data pre-stored in the control unit 7 . For example, if the area of the water seepage patch is calculated to be 0.5 cm ² and the first preset area threshold is 0.3 cm ² , it indicates that water seepage occurs in the power battery.

After step S400, it further includes: step S401, if the area of the water seepage patch is 0, it is determined that the power battery is not water seeped.

After step S401, it further includes: step S402, returning to the step S100 after an interval of T1, and acquiring a black and white image of the test paper.

In the embodiment of the present application, the duration of T1 is 1 minute, that is, starting from the first time step S100 is performed to obtain a black and white image of the test paper, and step S401 is completed. Go to step S402, after the interval T1, go back to the step S100, and acquire the black and white image of the test paper. Since the completion time of the S100-S402 process can be controlled in milliseconds, one minute is actually waiting to determine whether water seeps again. Minutes later, step S100 is performed again to obtain a black and white image of the test paper. Since the power battery will not be penetrated by external water most of the time, the monitoring process is maintained for a long time, which saves computing and does not need to consume too much power for monitoring.

The duration of T1 may also be a random duration of 1-10 minutes, which is not limited in this embodiment of the present application.

Step S500 , after judging whether the area of the seepage patch is greater than the first preset area threshold value, further includes, if the area of the seepage patch is not greater than the first preset area threshold value, return to step S402 , and the subsequent steps will not be repeated.

After step S500, the method further includes: step S600, if the area of the water seepage patch is greater than the first preset area threshold, determine that the power battery sees water, and turn on the first alarm.

In the embodiment of the present application, the first alarm is realized by an alarm device 6, and the alarm device 6 may be an alarm light. When the power battery sees water, the alarm light is on. The warning light is red, that is, when the warning light is red, it indicates that the power battery is leaking water.

The alarm device 6 can also be a speaker. When the power battery sees water, the speaker sounds. The sound of the speaker is "beep-beep-beep-beep", that is, when the speaker sounds "beep-beep-beep-beep", it indicates that the power battery seeps water.

The monitoring method provided in the first embodiment reduces the monitoring cost by acquiring the black and white image of the test paper without adopting a high-quality camera device; if water seepage occurs, water seepage patches will appear in the photographed image of the test paper, and by calculating the amount of water seepage patches The area of the seepage patch is compared with the first preset area threshold to determine whether water seepage occurs in the power battery, so as to avoid disassembling the power battery and reduce the monitoring cost.

Embodiment 2

The flow chart of the power battery water seepage monitoring method provided in the second embodiment is shown in FIG. 9 . The second embodiment is an improvement on the basis of the first embodiment, and the monitoring method includes:

S1000. Acquire a black-and-white image of the test strip, wherein the black-and-white image is used to present the water seepage in the area to be monitored of the power battery.

The photographing device 4 shoots the test paper 3, and 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, and each pixel is composed of a light-emitting diode and related circuits. The diode converts light into electric charges, and the collected The total amount of charge is proportional to the light intensity, and the accumulated charge is transmitted to the control unit 7 under the control of the mutual circuit. After filtering, amplification and DSP processing, the photographed image of the test strip 3 is obtained, and the photographed image is a black and white image.

After step S1000, the monitoring method further includes: S2000, generating the outline of the black and white image according to the black and white image.

For the template of the Prewitt operator in the second embodiment of the present application, see FIG. 6 in the first embodiment. The gradients g _x and g _y in the x and y directions at the pixel point P5 are calculated as:

dst=filter2D(src,ddepth,kernel[,dst[,anchor[,delta[,borderType]]]])

Referring to FIG. 7 in the first embodiment, FIG. 7 is a schematic diagram of an outline generated according to the black and white image shown in FIG. 5 .

After step S2000, the monitoring method further includes: S3000, calculating the water seepage patch area according to the contour.

The control unit 7 intercepts the grayscale image in the contour in FIG. 7 , and the grayscale image is shown in FIG. 8 in the first embodiment, and calculates the area of the contour. For the collected grayscale images, the edge detection algorithm is used to obtain the boundary points of the target area image, and the area of the contour is calculated through the boundary points.

The area of the contour is the image area, and there is a certain proportional relationship between it and the area of the actual seepage patch. The scale factor is determined by the lens parameters, and the scale factor k can be preset. Therefore, the area of the seepage patch Set to the product of the contour area and the coefficient k minus the area of the water-spreading ink area.

After step S3000, the monitoring method further includes: step S4000, judging whether the area of the seepage patch is zero.

Step S4000, after determining whether the area of the water seepage patch is 0, further includes: Step S4001, if the area of the water seepage patch is 0, it is determined that the power battery does not seep water.

After step S4001, it further includes: step S4002, returning to step S1000 after an interval of T1, and acquiring a black and white image of the test paper.

In the second embodiment of the present application, the duration of T1 is 2 minutes, that is, the first time step S1000 is performed, the black and white image of the test paper is obtained, and step S4001 is completed. If the area of the water seepage patch is 0, it is determined that the power battery does not seep water. Then go to step S4002, and return to the step S1000 after the interval T1, and acquire the black and white image of the test paper. Since the completion time of the S1000-S4002 process can be controlled in milliseconds, the two-minute time is actually waiting to determine whether water seeps again, and step S1000 is performed again two minutes later to obtain a black-and-white image of the test paper. Since the power battery will not be penetrated by external water most of the time, the monitoring process is maintained for a long time, which saves computing and does not need to consume too much power for monitoring.

If the area of the seepage patch is not 0, then go to step S5000, and continue to judge whether the area of the seepage patch is smaller than the second preset area threshold. If the area of the seepage patch is smaller than the second preset area threshold, then enter the judgment step S600 to determine whether the number of repetitions reaches N times. In the second embodiment, N is defined as 5, that is, when the area of the seepage patch is determined for the first time When it is less than the second preset area threshold, it is judged that the number of repetitions is 1 and does not reach 5, then enter step S7000, return to step S1000 after interval T2, and obtain the black and white image of the test paper, at this time, go through step S2000, step S2000 again Step S3000, Step S4000, if the area of the seepage patch is still smaller than the second preset area threshold when the step S4000 is reached again, at this time, it is judged that the number of repetitions is 2 and has not reached 5, and the above steps are continued to be repeated until the number of judgments is 5 If the water seepage area is smaller than the second preset area threshold, go to step S9000, determine that the power battery seeps slightly, turn on the second alarm, and the second alarm is different from the first An alarm, if the first alarm is that the alarm device 6 emits a "beep-beep-beep-beep" sound, the second alarm can be a "beep beep" sound to the alarm device 6 .

The impermeability, water seepage or slight water seepage of the power battery is its own property. If the water seepage of the power battery is poor, if the shell 1 encounters water, the area of the seepage patch must be larger than the first preset within a certain period of time. The area threshold, if the water permeability of the power battery is average, if the casing 1 encounters water, the area of the water seepage patch will be close to the second preset area threshold within a certain period of time, and will not change after that, so it is called slight seepage. If the area of the seepage patch is not zero and is greater than or equal to the second preset area threshold for the third time, 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 the cycle will be executed again. In step S500 in Example 1, the water seepage area is bound to be greater than the first preset area threshold, and at this time, it can be determined that the power battery sees water. Therefore, the first preset area threshold and the second preset area threshold are safety values designed in advance. After the two values are set, the method can meet the accuracy of determining water seepage or slight water seepage.

The T1 duration is longer than the T2 duration. In the second embodiment, the range of the T2 duration can be set to 3-5 seconds. On the one hand, it takes a process for water seepage plaques to appear on the soaking test paper 3 after the water enters. If the T2 speed is too fast, the water seepage or slight water seepage process is not completed, which is easy to produce Misjudgment; if the T2 speed is too slow, a lot of external water may have entered the power battery, causing short circuit and damage to the power battery, and it is meaningless to make a judgment at this time.

The monitoring method provided in the second embodiment reduces the monitoring cost by obtaining black and white images of the area to be monitored, without using a high-quality camera device; if water seepage occurs, water seepage patches will appear in the photographed image of the test paper. The area of the water seepage patch is compared with the first preset area threshold to determine whether water seepage occurs in the power battery, which avoids disassembling the power battery and reduces the monitoring cost. At the same time, the monitoring method can determine whether the power battery is in slight water seepage. If it is a slight water seepage, a second alarm can be issued to remind the maintenance personnel to take remedial measures in time.

10 is a schematic structural diagram of a power battery water seepage monitoring device provided by an embodiment of the present application. The power battery water seepage monitoring device includes:

The first module 101 is configured to obtain a black-and-white image of the test paper, wherein the black-and-white image is used to present the water seepage in the area to be monitored of the power battery; the second module 102 is configured to generate the black-and-white image according to the black-and-white image. contour; the third module 103 is configured to calculate the water seepage patch area according to the contour; the fourth module 104 is configured to judge whether the water seepage patch area is 0; the fifth module 105 is configured to respond to the water seepage spot If the block area is not 0, it is determined whether the water seepage patch area is greater than the first preset area threshold, and in response to the water seepage patch area being greater than the first preset area threshold, it is determined that the power battery seeps water.

This embodiment also provides a control unit. FIG. 11 is a schematic structural diagram of a control unit provided by an embodiment of the present application, which includes a memory 112, a processor 111, and a control unit stored in the memory 112 and available in the processor. A computer program running on 111 , when the processor 111 executes the computer program, the method for monitoring water seepage in a power battery as described in any of the foregoing embodiments is implemented.

The present application also provides a computer storage medium storing a computer program, and when the program is executed by a processor, the method for monitoring water seepage of a power battery according to any of the foregoing embodiments is implemented.

storage medium - any of various types of memory devices or storage devices. The term "storage medium" is intended to include: installation media, such as Compact Disc Read-Only Memory (CD-ROM), floppy disks, or tape devices; computer system memory or random access memory, such as dynamic random access memory (Dynamic Random Access Memory, DRAM), Double Data Rate Random Access Memory (Double Data Rate RAM, DDRRAM), Static Random Access Memory (Static RAM, SRAM), Extended Data Output Random Access Memory (Extended Data Output RAM) , EDORAM), Rambus RAM, etc.; non-volatile memory, such as flash memory, magnetic media (eg, hard disk or optical storage); registers or other similar types of memory elements, and the like. The storage medium may also include other types of memory or combinations thereof. In addition, the storage medium may be located in the first computer system in which the program is executed, or may be located in a second, different computer system connected to the first computer system through a network such as the Internet. The second computer system may provide program instructions to the first computer for execution. The term "storage medium" may include two or more storage media that may reside in different locations (eg, in different computer systems connected by a network). A storage medium may store program instructions (eg, implemented as a computer program) executable by one or more processors.

A storage medium containing computer-executable instructions provided by the embodiments of the present application, the computer-executable instructions of which are not limited to the above-mentioned method for monitoring the water seepage of a power battery, and can also perform the water seepage monitoring of a power battery provided by any embodiment of the present application. related operations in the method.

The power battery water seepage monitoring device, device, storage medium and system provided in the above embodiments can execute the power battery water seepage monitoring method provided by any embodiment of the present application, and have corresponding functional modules and effects for executing the method. For technical details that are not described in detail in the above embodiments, reference may be made to the water seepage monitoring method for a power battery provided by any embodiment of the present application.

Claims

A method for monitoring water seepage of a power battery, comprising:

acquiring a black-and-white image of the test strip, wherein the black-and-white image is used to present the water seepage in the to-be-monitored area of the power battery;

generating the outline of the black and white image according to the black and white image;

Calculate the seepage patch area according to the outline;

Determine whether the area of the seepage patch is 0;

In response to the water seepage patch area not being 0, determine whether the water seepage patch area is greater than a first preset area threshold, and in response to the water seepage patch area being greater than the first preset area threshold, determine the power battery seepage .
The method for monitoring water seepage of a power battery according to claim 1, wherein the surface of the test paper is provided with a background color area and a water diffusion ink area, and the water diffusion ink area is arranged around the inner edge of the to-be-monitored area , after the test paper encounters water, the water diffusion ink area irreversibly diffuses in the background color area and forms the water seepage patch.
The method for monitoring water seepage of a power battery according to claim 2, wherein the generating the outline of the black and white image according to the black and white image comprises:

According to the black and white image, the Prewitt operator is used to calculate and generate the contour.
The power battery water seepage monitoring method according to claim 3, wherein the calculating the water seepage patch area according to the outline comprises:

The area of the water seepage patch is set as the product of the area of the contour and the coefficient k minus the area of the water diffusion ink area.
The power battery water seepage monitoring method according to claim 4, after judging whether the water seepage patch area is 0, further comprising:

In response to the water seepage patch area being 0, it is determined that the power battery does not seep water;

After the interval T1, return to execute the acquisition of the black-and-white image of the test strip.
The method for monitoring water seepage of a power battery according to claim 4, after judging whether the area of the seepage patch is greater than a first preset area threshold, further comprising:

In response to the area of the water seepage patch being less than or equal to the first preset area threshold, returning to perform the acquiring of the black and white image of the test paper after an interval of T1.
The method for monitoring water seepage of a power battery according to any one of claims 1-6, after the determination of water seepage of the power battery, further comprising:

Activate the first alarm.
The method for monitoring water seepage of a power battery according to claim 7, after the response to the water seepage patch area not being 0, before the judging whether the water seepage patch area is greater than a first preset area threshold value, further comprising: :

determining whether the area of the seepage patch is smaller than a second preset area threshold;

In response to the water seepage patch area being smaller than the second preset area threshold, determining whether the number of repetitions reaches N times;

In response to the number of repetitions reaching N times, judging again whether the water seepage patch area is smaller than the second preset area threshold;

In response to the water seepage patch area being smaller than the second preset area threshold, it is determined that the power battery is slightly water seepage.
The method for monitoring water seepage of a power battery according to claim 8, after judging whether the number of repetitions reaches N times in response to the water seepage patch area being smaller than the second preset area threshold, further comprising:

In response to the number of repetitions being less than N times, returning to execute the acquisition of the black-and-white image of the test strip after an interval of T2.
The method for monitoring water seepage of a power battery according to claim 8, further comprising:

Turning on a second alarm; wherein the second alarm is different from the first alarm.
A power battery water seepage monitoring device, comprising:

The first module is configured to obtain a black and white image of the test paper, wherein the black and white image is used to present the water seepage in the area to be monitored of the power battery;

a second module, configured to generate the outline of the black and white image according to the black and white image;

The third module is configured to calculate the water seepage patch area according to the outline;

The fourth module is configured to judge whether the area of the seepage patch is 0;

The fifth module is configured to judge whether the area of the seepage patch is greater than a first preset area threshold in response to the area of the seepage patch being not 0, and to respond that the area of the seepage patch is greater than the first preset area Threshold, to determine the water seepage of the power battery.
A control unit, comprising a processor, a memory and a computer program stored on the memory and running on the processor, the processor implements any one of claims 1-10 when the processor executes the computer program The described power battery water seepage monitoring method.
A computer storage medium storing a computer program, when the computer program is executed by a processor, the method for monitoring water seepage of a power battery according to any one of claims 1-10 is implemented.