CN111766019A - Battery module, vehicle, detection method, and storage medium - Google Patents

Battery module, vehicle, detection method, and storage medium Download PDF

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Publication number
CN111766019A
CN111766019A CN202010601759.0A CN202010601759A CN111766019A CN 111766019 A CN111766019 A CN 111766019A CN 202010601759 A CN202010601759 A CN 202010601759A CN 111766019 A CN111766019 A CN 111766019A
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China
Prior art keywords
liquid
battery module
battery
top cover
detection signal
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CN202010601759.0A
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Chinese (zh)
Inventor
汤超龙
许达理
刘安龙
黄兴伟
韩海滨
隋宏亮
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Guangzhou Xiaopeng Motors Technology Co Ltd
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Guangzhou Xiaopeng Motors Technology Co Ltd
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Priority to CN202010601759.0A priority Critical patent/CN111766019A/en
Publication of CN111766019A publication Critical patent/CN111766019A/en
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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • 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
    • 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
    • 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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Battery Mounting, Suspending (AREA)
  • Secondary Cells (AREA)

Abstract

The application discloses a battery module. The battery module includes: the liquid sensor is used for detecting liquid accumulated on the shell. In the battery module, the vehicle, the detection method and the computer-readable storage medium of the embodiment of the application, the liquid sensor is arranged on the shell of the battery module to detect the liquid accumulated on the shell, and when the liquid permeates into the battery pack and does not enter the battery module, the liquid permeating condition can be rapidly detected, so that the water inlet detection sensitivity of the battery pack of the vehicle is improved, and the safety of the battery pack of the electric vehicle and the safety of the whole vehicle are ensured.

Description

Battery module, vehicle, detection method, and storage medium
Technical Field
The present disclosure relates to the field of batteries, and more particularly, to a battery module, a vehicle, a detection method, and a storage medium.
Background
The battery pack of the electric automobile provides power output for the whole automobile, and the use safety of the battery pack is very important. In the related art, the service state of the battery pack is judged according to related parameters such as voltage and temperature in the battery module of the battery pack, however, when liquid permeates into the battery pack, the service state needs to be indirectly judged according to the parameters such as voltage and temperature, certain hysteresis exists, and the safety of the battery pack and the whole vehicle is not facilitated.
Disclosure of Invention
In view of the above, embodiments of the present application provide a battery module, a vehicle, a detection method, and a storage medium.
The application provides a battery module, include:
a housing; and
a liquid sensor disposed on the housing for detecting liquid accumulated on the housing.
In some embodiments, the battery module includes:
the housing includes an enclosure wall; and
the battery module comprises a top cover and a bottom cover which are oppositely arranged, wherein the top cover and the bottom cover are respectively and fixedly connected with the surrounding wall so as to seal the electric core component of the battery module in the shell.
In some embodiments, the top cover is formed with a liquid guiding structure for guiding liquid formed on the top cover to the liquid sensor.
In certain embodiments, the top cover comprises a hydrophilic portion and a hydrophobic portion, the hydrophilic portion comprising the liquid directing structure, the hydrophilic portion coated with a hydrophilic coating, the hydrophobic portion coated with a hydrophobic coating.
In some embodiments, the liquid sensor is disposed at the center of the top cover, and the liquid guiding structure is a groove formed in the top cover, and a bottom wall of the groove is inclined from an edge of the top cover to the center of the top cover.
The application provides a vehicle, including the battery package, the battery package includes the battery module of a plurality of electricity connections, the battery module includes the casing and sets up liquid sensor on the casing.
The application provides a detection method for a vehicle, the vehicle includes a battery pack, the battery pack includes a plurality of electrically connected battery modules, the battery modules include a housing and a liquid sensor disposed on the housing, the detection method includes:
acquiring a liquid detection signal of the liquid sensor;
and judging whether accumulated liquid exists outside the battery module according to the liquid detection signal.
In certain embodiments, the detection method comprises:
acquiring a plurality of liquid detection signals of the plurality of liquid sensors;
and judging the liquid accumulation degree in the battery pack according to the plurality of liquid detection signals.
In certain embodiments, the detection method comprises:
acquiring a temperature detection signal and a voltage detection signal inside the battery module under the condition that liquid is accumulated outside the battery module;
and judging whether liquid permeates into the battery module or not according to the temperature detection signal and the voltage detection signal.
A non-transitory computer-readable storage medium containing computer-executable instructions that, when executed by one or more processors, cause the processors to perform the detection method is provided.
In the battery module, the vehicle, the detection method and the computer-readable storage medium of the embodiment of the application, the liquid sensor is arranged on the shell of the battery module to detect the liquid accumulated on the shell, and when the liquid permeates into the battery pack and does not enter the battery module, the liquid permeating condition can be rapidly detected, so that the water inlet detection sensitivity of the battery pack of the vehicle is improved, and the safety of the battery pack of the electric vehicle and the safety of the whole vehicle are ensured.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural view of a battery module according to an embodiment of the present application;
fig. 2 is a schematic structural view of a battery module according to an embodiment of the present application;
fig. 3 is a schematic structural view of a battery module according to an embodiment of the present application;
fig. 4 is a schematic structural view of a battery module according to an embodiment of the present application;
FIG. 5 is a schematic flow chart of a detection method according to an embodiment of the present application;
FIG. 6 is a schematic flow chart of a detection method according to an embodiment of the present application;
fig. 7 is a schematic flow chart of a detection method according to an embodiment of the present application.
Description of the main element symbols:
a housing 10, a surrounding wall 101, an end cap 1011, a first sub-end cap 10111, a second sub-end cap 10112, a side wall 1012, a top cap 102, a hydrophilic part 1021, a liquid guiding structure 10211, a hydrophilic coating 10212, a hydrophobic part 1022, a hydrophobic coating 10221, a bottom cap 103, and a liquid sensor 20;
the battery module 100.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
Referring to fig. 1, the present application provides a battery module 100. The battery module 100 includes a case 10 and a liquid sensor 20 disposed on the case 10, the liquid sensor 20 being for detecting liquid accumulated on the case 10.
Specifically, the housing 10 is substantially rectangular and surrounds the outside of the electric core assembly for fixing and protecting the electric core assembly.
A liquid sensor 20 is provided on the housing 10 for detecting liquid accumulated on the housing 10. The case 10 of the battery module 100 is provided with the liquid sensor 20, so that the liquid penetration can be detected quickly when the liquid penetrates into the battery pack and does not enter the battery module. Therefore, the sensitivity of water inlet detection of the vehicle battery pack is improved, and the safety of the electric vehicle battery pack and the whole vehicle is ensured.
Further, the liquid sensor 20 detects a conduction resistance value between two electrodes disposed inside thereof, and reflects a volume of the liquid accumulated on the housing 10 by the detected resistance value, thereby reflecting a degree of humidity of an environment outside the housing 10. The resistance to conduction between the two electrodes is relatively large in the absence of accumulated liquid on the housing 10. The resistance to conduction between the two electrodes is small when there is accumulated liquid on the casing 10. It will be appreciated that as the liquid penetrates and collects on the housing, the liquid inside the liquid sensor 20 becomes more and more, and the conduction resistance between the two electrodes inside the liquid sensor becomes smaller and smaller.
In some examples, the environment outside the housing 10 is dry, and the liquid inside the liquid sensor 20 is less, and the conduction resistance between the two electrodes inside the liquid sensor 20 is larger.
In other examples, the environment outside the housing 10 is relatively wet, the liquid inside the liquid sensor 20 is relatively high, and the conduction resistance between the two electrodes inside the liquid sensor 20 is relatively low.
The battery pack of the electric vehicle includes a plurality of battery modules 100 therein, the battery modules 100 include a plurality of cell assemblies therein, and the housing 10 of the battery modules 100 is provided with a liquid sensor 20 for detecting liquid accumulated on the housing 10. During vehicle use, water may enter the vehicle battery pack for several reasons. For example, other modules of the vehicle may leak, and liquid may seep into the interior of the battery pack. As another example, wading may cause the battery pack to enter water during driving in a rainy day. The process of the water inlet of the battery pack is divided into two stages, i.e., the liquid is in contact with the case 10 of the battery module 100 at the outside of the battery module 100, and the liquid is introduced into the inside of the battery module 100 to be in contact with the electric core assembly. The provision of the liquid sensor 20 in the case 10 of the battery module 100 enables the liquid to be quickly detected when the liquid has penetrated into the battery pack and has not yet entered the battery module. Therefore, the sensitivity of the water inlet detection of the vehicle battery pack is improved, and the stability of a battery pack system is guaranteed.
As described above, in the battery module 100 according to the embodiment of the present invention, the liquid sensor 20 is provided in the case 10 of the battery module 100, so that the liquid accumulated in the case 10 is detected, and when the liquid penetrates into the battery pack and does not enter the battery module, the liquid penetration can be detected quickly. Therefore, the sensitivity of water inlet detection of the vehicle battery pack is improved, the stability of a battery pack system is guaranteed, and the safety of the battery pack of the electric automobile and the safety of the whole automobile are guaranteed, so that the driving safety is guaranteed.
Referring to fig. 1 and 2, in some embodiments, the housing 10 includes a surrounding wall 101 and a top cover 102 and a bottom cover 103 disposed opposite to each other, wherein the top cover 102 and the bottom cover 103 are respectively fixedly connected to the surrounding wall 101 to enclose the electric core assembly of the battery module 100 in the housing 10.
Specifically, a surrounding wall 101, a top cover 102, and a bottom cover 103 surround the outside of the battery module 100 to fix and protect the cell assembly. The wall 101 comprises a pair of oppositely disposed end caps 1011 and a pair of oppositely disposed side walls 1012. The end cap 1011 includes a first sub-end cap 10111 and a second sub-end cap 10112, and the first sub-end cap 10111 is disposed on a side of the end cap 1011 close to the electric core assembly and is fixedly connected to the second sub-end cap 10112.
In this embodiment, the first sub-end cover 10111 may be made of plastic, so that the problem of short circuit of the cell assembly caused by assembly error or extrusion during the assembly process or when the module is extruded can be avoided, and the weight of the housing 10 and the battery module 100 can be effectively reduced by using the plastic. The second sub-end cap 10112 is made of metal, and is used for reinforcing the first sub-end cap 10112.
The two side walls 1012 are disposed perpendicular to the ground and surround the outer side of the battery module 100 together with the two end caps 1011. The material of the sidewall 1012 may be metal or plastic, and is not limited in particular. In some examples, the sidewall 1012 may be made of aluminum, and the aluminum housing may be more inexpensive and more flexible than other metal housings.
The surrounding wall 101 may be formed integrally, or formed by forming and connecting two end caps 1011 and two side walls 1012, or formed by connecting two end caps 1011 and one side wall 1012 first and then connecting with the second side wall 1012, or formed by connecting two side walls 1012 and one end cap 1011 first and then connecting with the second side end cap 1011. The assembly efficiency can be improved by adopting the integrated process to assemble the surrounding wall 101. The casing wall 101 is assembled by adopting a separately formed process, so that the subsequent maintenance, disassembly and upgrade work of the battery module 100 is facilitated.
The top cover 102 is disposed opposite to the bottom cover 103 on both sides of the surrounding wall 101 and is fixedly connected to the surrounding wall 101 for enclosing the electric core assembly in the housing 10. The top cover 102 is referred to as a bottom cover 103, and is far from the ground compared to the bottom cover 103.
The top cover 102 and the bottom cover 103 may be separately formed and then fixedly connected to the surrounding walls 101 to form the housing 10. The connection of the peripheral wall 101 to the top cover 102 and the bottom cover 103 is not limited, and may be fixed by welding, bonding, clamping, etc. When the material of the wall 101 is metal, the wall can be assembled by a welding process, and when the material of the wall 101 is plastic, the wall can be assembled by an adhesion process. Thus, the top cover 102 and the bottom cover 103 are respectively fixedly connected with the surrounding wall 101, so as to seal the electric core assembly in the housing 10, and play a role in fixing and protecting the electric core assembly.
Referring to FIG. 3, in some embodiments, the top cover 102 is formed with a liquid guide 10211 for guiding liquid formed on the top cover 102 toward the liquid sensor 20.
Specifically, liquid guide 10211 is formed on a surface of top cover 102, and is capable of directing liquid toward liquid sensor 20 as liquid accumulates on top cover 102. The wider the distribution of liquid directing structures 10211 on top cover 102, the more uniform the distribution density, and the better the directing effect. For example, referring to fig. 3 and 4, the liquid guiding structure 10211 may be in a shape of "king", a branch, an "i" shape, a "feng", etc., and is not limited in particular.
So, liquid guide structure 1021 is with even and extensively distributed in top cap 102 surface of appropriate interval, when liquid gathers at casing 10 surface, can realize faster guide effect, can in time report into water the early warning when liquid infiltration battery package is inside, improves battery module 100's security performance.
Referring again to fig. 3, in some embodiments, the cap 102 includes a hydrophilic portion 1021 and a hydrophobic portion 1022, the hydrophilic portion 1021 includes a liquid guiding structure 10211, the hydrophilic portion 1021 is coated with a hydrophilic coating 10212, and the hydrophobic portion 1022 is coated with a hydrophobic coating 10221.
Specifically, hydrophilic portion 1021 includes a liquid guiding structure 10211 and a hydrophilic coating 10212, and hydrophilic coating 10212 is coated on the surface of liquid guiding structure 10211 for guiding liquid to flow toward liquid sensor 20.
The hydrophobic part 1022 includes a hydrophobic coating 10221, and the hydrophobic coating 1022 is applied to a portion of the surface of the top cover 102 other than the hydrophilic coating 10212 for protecting the battery module 100 from liquid invasion and corrosion caused by a working environment and an accident.
In some examples, when liquid is located in the hydrophilic portion 1021, the hydrophilic coating directs the liquid droplets toward the liquid sensor 20 and causes the liquid to pool for further detection by the liquid sensor 20.
In other examples, when liquid is located in hydrophobic portion 1022, hydrophobic coating 10221 drives the liquid droplets away from hydrophobic portion 1022 while directing the liquid droplets toward hydrophilic portion 1021 such that the liquid droplets converge to the location of liquid sensor 20 where the liquid sensor 20 is located, and the liquid accumulated on housing 10 is detected by liquid sensor 20.
The hydrophilic coating 10212 can be a nano hydrophilic coating XZ-GT01 and the hydrophobic coating 10221 can be a P2i waterproof nano coating. The hydrophilic coating 10212 and the hydrophobic coating 10221 can be applied by spraying. By adopting the spraying process, the coating can uniformly cover the surface layer of the top cover 102, the porosity of the coating is reduced, and the spraying process has high processing efficiency and is convenient for processing and manufacturing products. Meanwhile, spraying the hydrophilic coating 10212 and the hydrophobic coating 10221 on the top cover 102 can also increase the wear resistance of the top cover 102 and improve the rigidity of the top cover 102. The rigidity of the lift cap 102 is advantageous to control the precision of the molding thereof, thereby improving the flatness of the battery module 100.
Referring again to FIG. 1, in some embodiments, liquid sensor 20 is disposed in the center of top cover 102, and liquid guide 10211 is a groove formed in top cover 102, the bottom wall of the groove sloping from the edge of top cover 102 toward the center of top cover 102.
Specifically, the liquid guiding structure 10211 is configured to be a groove shape, so as to collect the liquid in the hydrophilic portion 1021, and prevent the liquid from flowing around in the battery pack, which affects the overall performance of the battery pack and endangers the driving safety. The liquid sensor 20 is disposed at the center of the top cover 102, and the bottom wall of the groove of the liquid guide 10211 is inclined from the edge of the top cover 102 to the center of the top cover 102 to form a slope on the surface of the top cover 102 for guiding the liquid on the surface of the top cover 102 to the liquid sensor 20 disposed at the center of the top cover 102.
The combination of recess design and ramp design can more high-efficiently guide the liquid in the battery package to hydrophilic portion 1021 to drainage to liquid sensor 20 makes liquid sensor 20 can detect the condition of liquid infiltration fast, has improved the sensitivity that the vehicle battery package intake detected, ensures electric automobile battery package and whole car safety, thereby guarantees driving safety.
The embodiment of the present application also provides a vehicle including a battery pack including a plurality of electrically connected battery modules 100, the battery modules 100 including a case 10 and a liquid sensor 20 disposed on the case 10.
In the vehicle of this application embodiment, adopt above-mentioned battery module 100, through set up liquid sensor 20 on the casing 10 at battery module 100, detect the liquid of gathering on casing 10, inside liquid infiltration battery package, when not getting into in the battery module yet, just can detect the condition of liquid infiltration rapidly, improved the sensitivity that vehicle battery package intake detected, guarantee battery package system's stability ensures electric automobile battery package and whole car safety, thereby the driving safety has been guaranteed.
Referring to fig. 5, the present application further provides a detection method for a vehicle, where the vehicle includes a battery pack, the battery pack includes a plurality of electrically connected battery modules 100, each battery module 100 includes a housing 10 and a liquid sensor 20 disposed on the housing 10, and the detection method includes:
s10: acquiring a liquid detection signal of a liquid sensor;
s20: and judging whether accumulated liquid exists outside the battery module according to the liquid detection signal.
Specifically, the liquid sensor 20 detects a conduction resistance value between two electrodes inside the sensor, and generates a liquid detection signal. The liquid detection signal changes with the change of the conduction resistance between the two electrodes inside the liquid sensor 20, and after the processor acquires the liquid detection signal, whether accumulated liquid exists outside the battery module 100 is judged according to the liquid detection signal.
In some examples, no liquid is accumulated outside the battery module 100, that is, no liquid or less liquid is accumulated inside the liquid sensor 20, at this time, the conduction resistance between the two electrodes inside the liquid sensor 20 is relatively large, the liquid sensor 20 generates a corresponding liquid detection signal according to the resistance, and the processor determines that no liquid is accumulated outside the battery module 100 according to the detected liquid detection signal.
In other examples, accumulated liquid exists outside the battery module 100, the accumulated liquid is guided to the liquid sensor 20 through the liquid guiding structure 10211 on the surface of the top cover 102, at this time, the amount of liquid inside the liquid sensor 20 is large, the conduction resistance between two electrodes inside the liquid sensor 20 is small, the liquid sensor 20 generates a corresponding liquid detection signal according to the resistance, and the processor determines that the accumulated liquid exists outside the battery module 100 according to the detected liquid detection signal.
So, can be inside liquid infiltration battery package, when not getting into in the battery module yet, just can detect the condition of liquid infiltration rapidly, improve the sensitivity that the vehicle battery package intake detected, ensure electric automobile battery package and whole car safety.
Referring to fig. 6, in some embodiments, the detection method includes:
s30: acquiring a plurality of liquid detection signals of a plurality of liquid sensors;
s40: the degree of liquid accumulation in the battery pack is judged from the plurality of liquid detection signals.
Specifically, the battery pack for an electric vehicle contains a plurality of battery modules 100 inside, and a top cover 102 of each battery module 100 is provided with a liquid sensor 20 for detecting liquid accumulated on the top cover 102. The processor acquires a plurality of liquid detection signals of the plurality of liquid sensors 20, and determines the degree of liquid accumulation in the battery pack based on the plurality of liquid detection signals.
In some examples, the liquid sensors 20 of the plurality of battery modules 100 detect the water inlet signal, and it is determined that water seeps from a plurality of positions inside the battery pack, and the liquid accumulation condition is serious. At the moment, an alarm system can be triggered to inform the personnel in the vehicle to collect further measures, so that the safety of the personnel is ensured.
In other examples, if the liquid sensors 20 of a few battery modules 100 detect a water inlet signal and the remaining battery modules 100 do not detect a water inlet signal, it is determined that water is only partially leaked inside the battery pack, and the accumulation of liquid is light. At the moment, the prompt can be carried out on a vehicle-mounted central control screen or other vehicle-mounted display devices, so that the personnel in the vehicle are informed to acquire further measures, and the safety of the personnel is ensured.
Further, the top cover 102 of each battery module 100 is provided with the liquid sensor 20, and the resistance value of the liquid sensor 20 decreases as the ambient humidity increases. The water inflow condition inside the battery pack can be judged by calculating the difference between the resistance values of the respective liquid sensors 20.
In some examples, the resistance values of the respective liquid sensors 20 are less different, and the water accumulation condition outside the battery module 100 is similar. In other examples, the resistance values of the liquid sensors 20 are different greatly, so that the water accumulation condition outside the battery module 100 is complicated, the water accumulation outside some battery modules 100 is more, and the water accumulation outside some battery modules 100 is less.
Therefore, the liquid accumulation condition in the battery pack can be comprehensively reflected, accurate and comprehensive signals are provided for the whole vehicle, and the safety and the reliability of a battery system are improved.
Referring to fig. 7, in some embodiments, the detection method includes:
s50: acquiring a temperature detection signal and a voltage detection signal inside the battery module under the condition that liquid is accumulated outside the battery module;
s60: and judging whether liquid permeates into the battery module or not according to the temperature detection signal and the voltage detection signal.
Specifically, when there is accumulated liquid outside the battery module 100, the liquid may have penetrated into the battery module 100, or may be still in the initial stage of water intake, and the liquid has not penetrated into the battery module 100, and at this time, it needs to be further determined by combining the temperature detection signal and the voltage detection signal inside the battery module 100.
The electric core assembly can generate Joule heat in the normal charging and discharging processes. When water enters the battery module 100, the electric core assembly inside the battery module 100 is violently discharged, and the generated heat is more than that in a normal case, so that the temperature inside the battery module 100 is sharply increased. Acquiring the temperature detection signal can assist in determining whether the inside of the battery module 100 is permeated with liquid.
Further, the temperature detection signal comprises a temperature rise signal and a temperature difference signal. The temperature rise signal represents a value of the cell temperature higher than the ambient temperature in a unit time. The temperature difference signal indicates a change in the cell temperature, i.e., a difference in the cell temperature over a predetermined time interval.
According to the difference of battery type, the battery module quantity diverse of series-parallel connection in the battery package, the size of battery module is different, and the operating temperature of electric core is also different in the module, therefore the temperature rise signal that different batteries correspond also is different with the specific threshold value of difference in temperature signal. For example, the threshold of the temperature rise signal of the lithium ion battery is a degree centigrade per second, and the threshold of the temperature difference signal is B degree centigrade. For another example, the threshold of the temperature rise signal of the lithium iron phosphate battery is a 'centigrade per second, and the threshold of the temperature difference signal is B' centigrade. When one or more values of the temperature rise signal and the temperature difference signal exceed the threshold values corresponding to the battery types, it indicates that liquid may permeate into the battery module 100.
The cell voltage of the cell assembly can be increased in the normal charging process, and the cell voltage can be decreased in the normal discharging process. The water entering the battery module 100 causes the short circuit of the battery cell, and the voltage of the battery cell drops sharply. Acquiring the voltage detection signal can assist in determining whether the inside of the battery module 100 is permeated with liquid.
Further, the voltage detection signal includes a lowest voltage signal, a voltage drop rate signal, and a voltage difference signal. The lowest voltage signal represents the lowest voltage value of the battery cell in the normal charging and discharging process of the battery cell. The voltage drop rate signal indicates the rate at which the cell voltage drops, i.e., the value of the cell voltage drop per unit time. The voltage difference signal indicates a change in the cell voltage, i.e., a difference in the cell voltages over a predetermined time interval.
According to the difference of battery types, the number of the battery modules connected in series and in parallel in the battery pack is different, the sizes of the battery modules are different, and the voltage platforms of the electric cores in the modules are also different, so that the specific thresholds of the lowest voltage signals, the voltage drop rate signals and the pressure difference signals corresponding to different batteries are also different. For example, the threshold of the lowest voltage signal of the lithium ion battery is C volts, the threshold of the voltage drop rate signal is D volts per second, and the threshold of the voltage difference signal is E volts. For another example, the threshold of the minimum voltage signal of the lithium iron phosphate battery is C ' v, the threshold of the voltage drop rate signal is D ' v per second, and the threshold of the voltage difference signal is E ' v. When one or more of the lowest voltage signal, the voltage drop rate signal and the voltage difference signal exceeds the threshold corresponding to the battery type, it indicates that the inside of the battery module 100 may be infiltrated with liquid.
The processor determines that accumulated liquid exists outside the battery module 100 according to the detected liquid detection signal, and then acquires a temperature detection signal and a voltage detection signal inside the battery module 100, so as to determine whether the liquid permeates into the battery module 100. Whether the inside of battery module 100 intakes is judged to combine temperature detect signal and voltage detection signal, can improve the accuracy and the credibility of intaking and detecting, ensures electric automobile battery package and whole car safety.
Further, the processor can also acquire an insulation detection signal of the battery pack system, and comprehensively judge the water seepage condition of the battery module 100 by combining the liquid detection signal, the temperature detection signal and the voltage detection signal.
The embodiment of the application also provides a computer readable storage medium. One or more non-transitory computer-readable storage media containing computer-executable instructions that, when executed by one or more processors, cause the processors to perform the detection method of any of the embodiments described above.
The embodiment of the application also provides a vehicle. The vehicle includes a memory and one or more processors, one or more programs being stored in the memory and configured to be executed by the one or more processors. The program comprises instructions for carrying out the detection method according to any one of the embodiments described above.
The processor may be used to provide computational and control capabilities to support the operation of the entire vehicle. The memory of the vehicle provides an environment for the computer readable instructions in the memory to operate.
It will be understood by those skilled in the art that all or part of the processes of the methods of the above embodiments may be implemented by hardware instructions of a computer program, which may be stored in a non-volatile computer-readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), or the like.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A battery module, comprising:
a housing; and
a liquid sensor disposed on the housing for detecting liquid accumulated on the housing.
2. The battery module according to claim 1, wherein the housing comprises:
a surrounding wall; and
the battery module comprises a top cover and a bottom cover which are oppositely arranged, wherein the top cover and the bottom cover are respectively and fixedly connected with the surrounding wall so as to seal the electric core component of the battery module in the shell.
3. The battery module according to claim 2, wherein the top cap is formed with a liquid guide structure for guiding liquid formed on the top cap toward the liquid sensor.
4. The battery module of claim 3, wherein the top cover comprises a hydrophilic portion and a hydrophobic portion, the hydrophilic portion comprising the liquid directing structure, the hydrophilic portion coated with a hydrophilic coating, the hydrophobic portion coated with a hydrophobic coating.
5. The battery module according to claim 3, wherein the liquid sensor is disposed at the center of the top cover, the liquid guide structure is a groove formed in the top cover, and a bottom wall of the groove is inclined from an edge of the top cover to the center of the top cover.
6. A vehicle is characterized by comprising a battery pack, wherein the battery pack comprises a plurality of electrically connected battery modules, and each battery module comprises a shell and a liquid sensor arranged on the shell.
7. A detection method for a vehicle including a battery pack including a plurality of electrically connected battery modules including a case and a liquid sensor provided on the case, the detection method comprising:
acquiring a liquid detection signal of the liquid sensor;
and judging whether accumulated liquid exists outside the battery module according to the liquid detection signal.
8. The detection method according to claim 7, characterized in that it comprises:
acquiring a plurality of liquid detection signals of the plurality of liquid sensors;
and judging the liquid accumulation degree in the battery pack according to the plurality of liquid detection signals.
9. The detection method according to claim 7, characterized in that it comprises:
acquiring a temperature detection signal and a voltage detection signal inside the battery module under the condition that liquid is accumulated outside the battery module;
and judging whether liquid permeates into the battery module or not according to the temperature detection signal and the voltage detection signal.
10. A non-transitory computer-readable storage medium of computer-executable instructions that, when executed by one or more processors, cause the processors to perform the detection method of any one of claims 7-9.
CN202010601759.0A 2020-06-29 2020-06-29 Battery module, vehicle, detection method, and storage medium Pending CN111766019A (en)

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Application publication date: 20201013