CN117154257B - Battery pack water leakage detection method and device - Google Patents
Battery pack water leakage detection method and device Download PDFInfo
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- CN117154257B CN117154257B CN202311427849.2A CN202311427849A CN117154257B CN 117154257 B CN117154257 B CN 117154257B CN 202311427849 A CN202311427849 A CN 202311427849A CN 117154257 B CN117154257 B CN 117154257B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 182
- 238000001514 detection method Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 24
- 230000000630 rising effect Effects 0.000 claims abstract description 5
- 238000004891 communication Methods 0.000 claims description 46
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- 238000012856 packing Methods 0.000 abstract 1
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- 238000012545 processing Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
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- 239000011148 porous material Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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- 230000003068 static effect Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4228—Leak testing of cells or batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The application discloses a battery water-packing detection method and device, and relates to the field of batteries. The method comprises the following steps: acquiring a first humidity inside the battery pack through a humidity sensor; and when the rising amplitude of the first humidity is larger than a first threshold value, determining that the battery is water-filled, wherein the first threshold value is calculated according to a preset water leakage model and a water inlet volatilization volume model. According to the battery pack water leakage detection method, the water inlet condition inside the battery pack can be monitored in real time when the waterproof test is carried out on the battery pack, the test can be terminated in time after the water inlet of the battery pack is determined, and the safety of the waterproof test of the battery pack is improved.
Description
Technical Field
The application relates to the field of batteries, in particular to a method and a device for detecting water leakage of a battery.
Background
The market share of electric vehicles continues to rise, and the holding capacity of electric vehicles also rises. Because various complicated working conditions exist when the electric automobile is used, for example, wading, heavy rain and the like exist, and the battery pack can be contacted with a large amount of water. To cope with these conditions, the battery pack needs to have sufficient waterproof capability to ensure that the battery pack will not enter water when it encounters water for a long period of time.
However, at present, when the waterproof test is performed on the battery pack, the water inlet condition inside the battery pack is monitored by a lack of technical means, the test cannot be stopped in time after the water inlet of the battery pack, and potential safety hazards exist.
Disclosure of Invention
In view of the above problems, the application provides a method and a device for detecting water leakage of a battery pack, which can monitor water inlet conditions inside the battery pack in real time, and solve the problems that the test cannot be stopped in time after the water inlet of the battery pack, and potential safety hazards exist.
In a first aspect, the present application provides a method for detecting water leakage in a battery pack, where at least one humidity sensor is disposed inside the battery pack, the method comprising: acquiring a first humidity inside the battery pack through a humidity sensor; and when the rising amplitude of the first humidity is larger than a first threshold value, determining that the battery is water-filled, wherein the first threshold value is calculated according to a preset water leakage model and a water inlet volatilization volume model.
In the technical scheme of the embodiment of the application, at least one humidity sensor is arranged in the battery pack, and when the battery pack leaks water, the degree of water leakage is reflected through the change of humidity. When the humidity rise within the battery pack is greater than the first threshold, it may be determined that the battery pack is leaking water. According to the battery pack water leakage detection method, the water inlet condition inside the battery pack can be monitored in real time when the waterproof test is carried out on the battery pack, the test can be terminated in time after the water inlet of the battery pack is determined, and the safety of the waterproof test of the battery pack is improved.
In some embodiments, prior to obtaining the first humidity inside the battery pack by the humidity sensor, the method further comprises: and determining the critical aperture of the battery pack under the first water leakage condition according to a preset water leakage model, wherein the first water leakage condition comprises water depth and air pressure in the battery pack. And determining a second water leakage condition according to the water leakage critical aperture, and calculating the mass of water vapor leaked into the battery pack under the second water leakage condition according to the water inlet volatilization model, wherein the second water leakage condition comprises the water leakage aperture, the water leakage duration and the second humidity, the water leakage aperture is larger than or equal to the water leakage critical aperture, and the second humidity is the initial humidity in the battery pack. The first threshold is determined based on the water vapor mass, the second humidity, and the volume of free space within the battery pack. The first threshold value is determined through the preset water leakage model and the water inlet volatilization volume model, so that whether the battery pack leaks water or not can be determined more accurately, and the safety of the waterproof test of the battery pack is further improved.
In some embodiments, determining the first threshold based on the water vapor mass, the second humidity, and the volume of free space within the battery pack comprises: calculating the third humidity of the battery pack after water leakage according to the mass of the water vapor and the volume of the free space in the battery pack; and determining a first threshold according to the third humidity and the second humidity. The first threshold value is determined through the third humidity after water leakage and the second humidity when water is not leaked, so that the first threshold value can be determined more accurately, the situation that the battery pack leaks water can be reflected more truly by the more accurate first threshold value, and the safety of the waterproof test of the battery pack is further improved.
In some embodiments, determining the first threshold from the third humidity and the second humidity includes: and taking the difference value between the third humidity and the second humidity as a first threshold value. The difference value between the third humidity and the second humidity is a critical value for determining the water leakage of the battery, and the accuracy for determining the water leakage of the battery can be further improved by taking the difference value between the third humidity and the second humidity as a first threshold value, so that the safety of the water-proof test of the battery is improved again.
In some embodiments, determining the first threshold from the third humidity and the second humidity includes: and multiplying the difference between the third humidity and the second humidity by a preset proportion to obtain a first threshold value. The difference between the third humidity and the second humidity is multiplied by the preset proportion, so that water leakage can be determined in advance when the water leakage amount of the battery pack does not reach the critical value, more processing time is given to staff under the condition of ensuring the accuracy, and the safety of the waterproof test of the battery pack can be effectively improved.
In some embodiments, when the number of humidity sensors is greater than 1, the largest one of the readings of the plurality of humidity sensors is determined as the first humidity. When the battery pack leaks, the sensor close to the water leakage point responds faster and the numerical value is larger, so that the maximum value in the readings of the humidity sensors is taken for processing, the condition of the battery pack leaking water can be reflected faster and more accurately, and the safety of the battery pack waterproof test is improved.
In some embodiments, after determining that the battery is leaking, the method further comprises: an alarm signal is sent. After the water leakage of the battery pack is determined, the alarm is given, so that workers can be reminded of timely detecting, accidents caused by the water leakage are avoided, and the safety of the waterproof test of the battery pack can be effectively improved.
In a second aspect, the present application provides a battery water-in-package detection device, comprising: the device comprises a battery pack, a gateway, a first Bluetooth communication module and a second Bluetooth communication module. The battery pack comprises at least one humidity sensor, each humidity sensor is connected with the first Bluetooth communication module respectively, and the humidity sensor is used for acquiring first humidity inside the battery pack. The gateway includes waterproof bluetooth antenna, and waterproof bluetooth antenna includes second bluetooth communication module and extension line, and the one end and the gateway of extension line are connected, and the other end is connected with second bluetooth communication module, and extension line and second bluetooth communication module are waterproof treatment. The first Bluetooth communication module is in communication connection with the second Bluetooth communication module.
Through setting up at least one humidity transducer in the battery package to with humidity transducer through communication module and gateway connection, can acquire the inside humidity data of battery package through humidity transducer, and then confirm whether the battery package leaks. The safety of the waterproof test of the battery pack is improved.
The second Bluetooth communication module is placed in water through the waterproof Bluetooth antenna, and can be placed at a position close to the first Bluetooth module, so that the problems of poor signal and power increase caused by reduction of the Bluetooth transmission distance in water are solved, and the battery water-leakage detection device is enabled to operate more stably.
In some embodiments, when multiple humidity sensors are included in the battery pack, the multiple humidity sensors are evenly distributed along the edges of the battery pack.
Through evenly distributed a plurality of humidity transducer at battery package edge, can in time detect the condition of leaking in a plurality of positions, can more accurate confirm whether the battery package leaks, improve the security of battery package waterproof test.
In some embodiments, when 2 humidity sensors are included in the battery pack, the 2 humidity sensors are oppositely disposed at both ends of the battery pack.
Through setting up 2 humidity transducer relatively in the both ends of battery package, can confirm accurately whether the battery package leaks under the circumstances, practice thrift detection cost.
In some embodiments, each humidity sensor is 5cm to 50cm from the edge of the battery pack.
Through setting up humidity transducer in 5cm ~50cm department from the battery package edge, the inside humidity of measurement battery package that can be more accurate, and then improve the precision that detects whether the battery package leaks, improve the security of battery package waterproof test.
The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:
fig. 1 is a schematic flow chart of a method for detecting water leakage of a battery pack provided by the application;
FIG. 2 is a schematic view of a battery pack according to some embodiments of the present application;
FIG. 3 is a schematic flow chart of another method for detecting water leakage of a battery pack according to the present application;
fig. 4 is a schematic structural diagram of a battery water-leakage detection device provided by the present application;
fig. 5 is an application schematic diagram of the battery water-leakage detection device provided in the present application;
FIG. 6 is a schematic view of a battery pack according to other embodiments of the present application;
fig. 7 is a schematic view of a battery pack according to other embodiments of the present application.
Reference numerals in the specific embodiments are as follows:
a battery pack 11; a humidity sensor 12; a water leakage hole 13; a second bluetooth communication module 14; an extension line 15; a gateway 16.
Detailed Description
Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.
In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural sheets" refers to two or more (including two).
In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, rather than indicating or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.
In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may 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 embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.
Currently, from the development of market situation, the holding amount of electric vehicles is increasing. The power of the electric automobile is provided by a battery pack. The battery pack is composed of a plurality of battery cells and is controlled and monitored by a connector and a battery management system.
When the electric automobile is used, various complicated working conditions exist, for example, wading, heavy rain and the like can cause the battery pack to contact a large amount of water. In order to secure the reliability of the electric vehicle, it is necessary for the battery pack to have a sufficient waterproof capability.
Currently, when a battery pack is subjected to water immersion test, the waterproof performance of the battery pack is often tested by placing the battery pack in a static water pressure test environment. After a period of time, the tester observes whether there is water leakage or water droplet formation to determine the sealing performance of the battery pack.
However, when testing the battery pack, whether water is fed into the battery pack cannot be monitored in real time, and the test cannot be stopped in time. The water entering the battery pack can cause short circuit, heating, explosion and the like of the battery in the battery pack, and potential safety hazards exist.
Based on the above consideration, the application proposes to provide a humidity sensor in the battery pack, and set a humidity threshold (first threshold) of the leaked water according to a preset water leakage model and a water inlet volatilization volume model, and determine that the battery pack leaks when the humidity rises by a magnitude greater than the first threshold.
Therefore, the water inlet condition inside the battery pack can be monitored in real time when the waterproof test is carried out on the battery pack, the test can be terminated in time after the water inlet of the battery pack is determined, and the safety of the waterproof test of the battery pack is improved.
The battery pack water leakage detection method can be applied to water immersion tests, high-pressure spraying tests and the like of battery packs.
Fig. 1 is a schematic flow chart of a method for detecting water leakage of a battery pack according to the present application, and fig. 2 is a schematic structural diagram of a battery pack according to some embodiments of the present application.
Referring to fig. 1, the method for detecting water leakage of a battery includes:
s201, acquiring first humidity inside the battery pack through a humidity sensor.
In some possible embodiments, referring to fig. 2, at least one humidity sensor 12 may be disposed inside the battery pack 11, and the humidity sensor 12 may obtain a first humidity inside the battery pack. Humidity sensor 12 may convert the measurement of humidity into an electrical or digital signal that is then transmitted to a corresponding device for processing or recording.
The humidity sensor 12 may be based on the influence of humidity on a certain physical quantity, such as capacitance, resistance, conductivity, or dielectric constant, among others. The humidity sensitive element in the sensor can generate corresponding physical change according to the change of humidity, so that the change of the sensor output signal is caused, and the measurement result of the humidity is obtained.
And S202, determining that the battery is water-filled when the amplitude of the first humidity rise is larger than a first threshold value.
In some possible embodiments, the first threshold is calculated according to a preset water leakage model and a water inlet volatilization model.
When the battery pack leaks water, the water enters the battery pack, and the humidity can be quickly increased due to evaporation of the water in the battery pack. According to a pre-established water leakage model and a water evaporation model, the theoretical rising rate of the humidity in the battery pack after water leakage can be calculated, and the first threshold value is determined. In the subsequent testing process, if the humidity exceeds the first threshold value in the rising amplitude of the humidity, personnel can be notified to process the sample in time, and potential safety hazards are reduced.
In this embodiment, at least one humidity sensor is disposed in the battery pack, and when the battery pack leaks, the degree of water leakage is reflected by the change of humidity. When the humidity rise within the battery pack is greater than the first threshold, it may be determined that the battery pack is leaking water. According to the battery pack water leakage detection method, the water inlet condition inside the battery pack can be monitored in real time when the waterproof test is carried out on the battery pack, the test can be terminated in time after the water inlet of the battery pack is determined, and the safety of the waterproof test of the battery pack is improved.
Fig. 3 is another flow chart of the method for detecting water leakage of a battery pack provided by the application.
In some embodiments, referring to fig. 2, before the first humidity inside the battery pack is acquired by the humidity sensor, the method further comprises:
s301, determining a water leakage critical aperture of the battery pack under a first water leakage condition according to a preset water leakage model, wherein the first water leakage condition comprises water depth and air pressure in the battery pack.
Assuming that the height of the water leakage hole and the water surface is h, the inlet pressure P of the water leakage position can be calculated 1 . Let the air pressure in the battery pack be P 2 . The water leakage critical aperture diameter d can be calculated according to the following formula:
wherein,the surface tension coefficient of water is 0.0728N/m. According to the water leakage position P1=1.1×10 5 pa, if the air pressure in the battery pack is 1.0 x 10 of the atmospheric pressure 5 pa, the critical pore diameter of water leakage d=29 μm can be calculated.
S302, determining a second water leakage condition according to the water leakage critical aperture, and calculating the mass of water vapor leaked into the battery pack under the second water leakage condition according to the water inlet volatilization model.
In some embodiments, the second leak condition includes a leak aperture, a leak duration leak aperture being greater than or equal to a leak critical aperture. The water vapor mass m can be calculated according to the following formula 0 ：
Wherein W is the evaporation rate of water, S is the water inlet surface area, and can be calculated according to the water leakage aperture, and t is the water leakage duration.
Wherein W can be calculated by the following formula:
in the formula, A is the molecular diffusion coefficient of water (2.56.10 -5 m 2 S), E is saturated water vapor pressure, E is actual water vapor pressure, and P is standard atmospheric pressure.
And S303, determining a first threshold according to the water vapor mass, the second humidity and the volume of free space in the battery pack.
Wherein the second humidity is an initial humidity within the battery pack.
The third humidity after the battery pack leaks can be calculated according to the mass of the water vapor and the volume of the free space in the battery pack. And determining a first threshold according to the third humidity and the second humidity.
The first threshold value is determined through the third humidity after water leakage and the second humidity when water is not leaked, so that the first threshold value can be determined more accurately, the situation that the battery pack leaks water can be reflected more truly by the more accurate first threshold value, and the safety of the waterproof test of the battery pack is further improved.
In some embodiments, the water vapor quality may be based onSecond humidity->And the volume V of the free space in the battery pack calculates the third humidity after water leakage +.>：
Wherein,is saturated steam density (0.02304 kg/m. Mu.).
In this embodiment, the first threshold is determined by the preset water leakage model and the water inlet volatilization volume model, so that whether the battery pack leaks water can be determined more accurately, and the safety of the waterproof test of the battery pack is further improved.
In order to verify the calculation accuracy, a water leakage hole can be manufactured in a closed container according to the second water leakage condition, the humidity change in the container is measured, and the theoretical humidity and the actual humidity are verified.
For example, a water leakage hole of 110 μm can be made in a 7L capacity metal box, and the water leakage hole is placed under water for 1 meter for 4 hours. The initial humidity in the metal box was 63.15%.
The theoretical third humidity and the actual third humidity can be referred to in table 1:
TABLE 1
According to table 1, it can be determined that the deviation between the theoretical third humidity and the actual third humidity is about 2%, and the theoretical third humidity can accurately predict whether water is fed.
In some embodiments, the free space volume within the battery pack is about 50L, and the expansion of 7L to 50L in the above calculation process can be calculated to result in a third humidity of about 69.35% after 4 hours of water intake.
In some embodiments, the difference between the third humidity and the second humidity may be used as the first threshold. For example, in the above example, the third humidity was 69.35%, the second humidity was 63.15%, and the third humidity was raised by 6.2% as compared with the second humidity. The first threshold may be to round the difference, i.e. the first threshold is 6%.
Because the difference value between the third humidity and the second humidity is a critical value for determining the water leakage of the battery, the accuracy for determining the water leakage of the battery can be further improved by taking the difference value between the third humidity and the second humidity as a first threshold value, and the safety of the water-proof test of the battery is improved again.
In other embodiments, the difference between the third humidity and the second humidity may be multiplied by a preset ratio to obtain the first threshold. For example, the preset ratio may be 80%, in the above example, the third humidity is 69.35%, the second humidity is 63.15%, and the third humidity is 6.2% higher than the second humidity. The first threshold may be 80% of the difference and the logarithm is integer, i.e. the first threshold is 5%.
The difference between the third humidity and the second humidity is multiplied by the preset proportion, so that water leakage can be determined in advance when the water leakage amount of the battery pack does not reach the critical value, more processing time is given to staff under the condition of ensuring the accuracy, and the safety of the waterproof test of the battery pack can be effectively improved.
In some embodiments, when the number of humidity sensors is greater than 1, the largest one of the readings of the plurality of humidity sensors is determined as the first humidity. When the battery pack leaks, the sensor close to the water leakage point responds faster and the numerical value is larger, so that the maximum value in the readings of the humidity sensors is taken for processing, the condition of the battery pack leaking water can be reflected faster and more accurately, and the safety of the battery pack waterproof test is improved.
In some embodiments, after determining that the battery is leaking, the method further comprises: an alarm signal is sent. After the water leakage of the battery pack is determined, the alarm is given, so that workers can be reminded of timely detecting, accidents caused by the water leakage are avoided, and the safety of the waterproof test of the battery pack can be effectively improved.
Fig. 4 is a schematic structural diagram of the battery water-leakage detection device provided by the application.
Referring to fig. 4, the battery water-leakage detecting device includes: battery pack, gateway, and communication module.
As an example, the present application may use a bluetooth communication module as the communication module. That is, in the present application, the communication module may include a first bluetooth communication module and a second bluetooth communication module.
The battery pack comprises at least one humidity sensor, each humidity sensor is connected with the first Bluetooth communication module respectively, and the humidity sensor is used for acquiring first humidity inside the battery pack.
In this embodiment, by setting at least one humidity sensor in the battery pack and connecting the humidity sensor with the gateway through the communication module, humidity data inside the battery pack can be obtained through the humidity sensor, so as to determine whether the battery pack leaks. The safety of the waterproof test of the battery pack is improved.
In other implementations, communication may also be achieved by integrating or communicatively coupling other types of wired or wireless communication modules with the humidity sensor.
By way of example, the wired communication module includes, for example, an RJ45 interface, an RS232 interface, an RS485 interface, and the like. The wireless communication module can be a wifi module, a ZigBee module, an NB-IoT module or the like besides the Bluetooth module.
Fig. 5 is an application schematic diagram of the battery water-leakage detection device provided by the application.
Fig. 5 also shows a scenario of battery water-leakage detection using the battery water-leakage detection device provided by the present application. The battery pack 11 is included, and the humidity sensor 12 is provided in the battery pack 11. The gateway 16 is connected with an extension line 15, and the other end of the extension line 15 is provided with a second Bluetooth communication module 14. The second bluetooth communication module 14 is placed near the battery pack 11 through an extension cord. The humidity sensor 12 in the battery pack 11 may be integrated with or communicatively connected to the first bluetooth communication module. The first bluetooth communication module is communicatively coupled to the second bluetooth communication module 14. The gateway 16 receives information transmitted from the humidity sensor 12 and acquires humidity data inside the battery pack 11.
In some embodiments, with reference to fig. 7, the communication module is communicatively coupled to a gateway, comprising: each humidity sensor 12 is connected to a first bluetooth communication module, respectively. The gateway 16 includes waterproof bluetooth antenna, and waterproof bluetooth antenna includes second bluetooth communication module 14 and extension 15, and the one end and the gateway 16 of extension 15 are connected, and the other end is connected with second bluetooth communication module 14, and extension 15 and second bluetooth communication module 14 do waterproof treatment. The first bluetooth communication module is communicatively coupled to the second bluetooth communication module 14.
The second Bluetooth communication module is placed in water through the waterproof Bluetooth antenna, and can be placed at a position close to the first Bluetooth module, so that the problems of poor signal and power increase caused by reduction of the Bluetooth transmission distance in water are solved, and the battery water-leakage detection device is enabled to operate more stably.
Fig. 6 is a schematic view of a battery pack according to another embodiment of the present application, and fig. 7 is a schematic view of a battery pack according to another embodiment of the present application.
In some embodiments, referring to fig. 2, 6 and 7, when a plurality of humidity sensors 12 are included in the battery pack, the plurality of humidity sensors 12 are uniformly distributed along the edge of the battery pack 11.
In some embodiments, referring to fig. 2, when 2 humidity sensors 12 are included in the battery pack 11, the 2 humidity sensors 12 are oppositely disposed at both ends of the battery pack 11. By disposing 2 humidity sensors 121 at opposite ends of the battery pack 11, the detection cost can be saved in the case where it is possible to accurately determine whether the battery pack 11 leaks.
In some embodiments, referring to fig. 6, when 4 humidity sensors 12 are included in the battery pack 11, the 4 humidity sensors 12 may be disposed at midpoints of 4 sides of the battery pack 11, respectively.
In some embodiments, referring to fig. 7, when 8 humidity sensors 12 are included in the battery pack 11, the 8 humidity sensors 12 may be provided 4 on the top and bottom surfaces, respectively, on the basis of fig. 6.
In this embodiment, through evenly distributed a plurality of humidity transducer at battery package edge, can in time detect the condition of leaking of a plurality of positions, can more accurate confirm whether the battery package leaks, improve the security of battery package waterproof test.
In some embodiments, each humidity sensor 12 is 5cm to 50cm from the edge of the battery pack 11. For example, it may be placed at a distance of 10cm, 15cm or 20cm from the edge, etc.
Through setting up humidity transducer in 5cm ~50cm department from the battery package edge, the inside humidity of measurement battery package that can be more accurate, and then improve the precision that detects whether the battery package leaks, improve the security of battery package waterproof test.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (10)
1. A battery pack water leakage detection method, wherein at least one humidity sensor is provided inside a battery pack, the method comprising:
determining a water leakage critical aperture of the battery pack under a first water leakage condition according to a preset water leakage model, wherein the first water leakage condition comprises water depth and air pressure in the battery pack;
determining a second water leakage condition according to the water leakage critical aperture, and calculating the mass of water vapor leaked into the battery pack under the second water leakage condition according to a water inlet volatilization model, wherein the second water leakage condition comprises a water leakage aperture and a water leakage duration, and the water leakage aperture is larger than or equal to the water leakage critical aperture;
determining a first threshold according to the water vapor quality, a second humidity and the volume of free space in the battery pack, wherein the second humidity is the initial humidity in the battery pack;
acquiring a first humidity inside the battery pack through the humidity sensor;
and determining that the battery is leaking when the magnitude of the first humidity increase is greater than the first threshold.
2. The method of claim 1, wherein the determining the first threshold based on the water vapor mass, the second humidity, and the volume of free space within the battery pack comprises:
calculating the third humidity of the battery pack after water leakage according to the mass of the water vapor and the volume of the free space in the battery pack;
and determining the first threshold according to the third humidity and the second humidity.
3. The method of claim 2, wherein said determining the first threshold based on the third humidity and the second humidity comprises:
and taking the difference value between the third humidity and the second humidity as the first threshold value.
4. The method of claim 2, wherein said determining the first threshold based on the third humidity and the second humidity comprises:
and multiplying the difference value between the third humidity and the second humidity by a preset proportion to obtain the first threshold value.
5. The method of claim 1, wherein when the number of humidity sensors is greater than 1, determining the largest one of the plurality of humidity sensor readings as the first humidity.
6. The method of any one of claims 1-5, wherein after determining that the battery is leaking, the method further comprises:
an alarm signal is sent.
7. A battery water-in-package detection device, the device comprising:
the gateway comprises a battery pack, a gateway, a first Bluetooth communication module and a second Bluetooth communication module;
the battery pack comprises at least one humidity sensor, each humidity sensor is connected with the first Bluetooth communication module, and the humidity sensor is used for acquiring first humidity inside the battery pack;
the gateway comprises a waterproof Bluetooth antenna, the waterproof Bluetooth antenna comprises a second Bluetooth communication module and an extension line, one end of the extension line is connected with the gateway, the other end of the extension line is connected with the second Bluetooth communication module, and the extension line and the second Bluetooth communication module are subjected to waterproof treatment;
the first Bluetooth communication module is in communication connection with the second Bluetooth communication module and is used for sending the first humidity to the gateway, the gateway is used for determining that the battery pack leaks when the rising amplitude of the first humidity is larger than a first threshold value, the first threshold value is determined according to the water vapor quality, the second humidity and the volume of free space in the battery pack, the second humidity is the initial humidity in the battery pack, the water vapor quality is the water vapor quality leaked into the battery pack, which is obtained by calculation of a water vapor volatilization amount model according to second water leakage conditions, the second water leakage conditions comprise water leakage aperture and water leakage duration, the second water leakage conditions are determined according to water leakage critical aperture, the water leakage critical aperture is determined according to a preset water leakage model according to first water leakage conditions, and the first water leakage conditions comprise water depth and air pressure in the battery pack.
8. The apparatus of claim 7, wherein when a plurality of humidity sensors are included in the battery pack, the plurality of humidity sensors are uniformly distributed along the edge of the battery pack.
9. The apparatus of claim 8, wherein when 2 of the humidity sensors are included in the battery pack, 2 of the humidity sensors are oppositely disposed at both ends of the battery pack.
10. The device of claim 8 or 9, wherein each of the humidity sensors is 5cm to 50cm from the edge of the battery pack.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539007A (en) * | 2012-02-15 | 2012-07-04 | 王维 | Water-free type wet bulb temperature measuring device |
| KR20150092999A (en) * | 2014-02-06 | 2015-08-17 | (주)프로차일드 | Diaper Alarm Systems |
| CN207730915U (en) * | 2018-01-22 | 2018-08-14 | 上海捷新动力电池系统有限公司 | A kind of automatic submerging test equipment of power battery pack |
| WO2020118533A1 (en) * | 2018-12-11 | 2020-06-18 | 中广核工程有限公司 | Nuclear power plant leakage monitoring alarm method and alarm system |
| CN215222843U (en) * | 2021-06-01 | 2021-12-17 | 湖北能泰科技有限公司 | Safety instrument with inside alarming function that leaks |
| WO2022171730A1 (en) * | 2021-02-15 | 2022-08-18 | Envio Systems Gmbh | Cloud-based automation system, zone controller, building gateway, and methods thereof for increasing energy efficiency of buildings |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10047971B2 (en) * | 2016-04-15 | 2018-08-14 | Ametros Solutions LLC | Home automation system |
-
2023
- 2023-10-31 CN CN202311427849.2A patent/CN117154257B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539007A (en) * | 2012-02-15 | 2012-07-04 | 王维 | Water-free type wet bulb temperature measuring device |
| KR20150092999A (en) * | 2014-02-06 | 2015-08-17 | (주)프로차일드 | Diaper Alarm Systems |
| CN207730915U (en) * | 2018-01-22 | 2018-08-14 | 上海捷新动力电池系统有限公司 | A kind of automatic submerging test equipment of power battery pack |
| WO2020118533A1 (en) * | 2018-12-11 | 2020-06-18 | 中广核工程有限公司 | Nuclear power plant leakage monitoring alarm method and alarm system |
| WO2022171730A1 (en) * | 2021-02-15 | 2022-08-18 | Envio Systems Gmbh | Cloud-based automation system, zone controller, building gateway, and methods thereof for increasing energy efficiency of buildings |
| CN215222843U (en) * | 2021-06-01 | 2021-12-17 | 湖北能泰科技有限公司 | Safety instrument with inside alarming function that leaks |
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