CN114243130A - Battery pack leakage detection method, battery pack, vehicle and storage medium - Google Patents

Battery pack leakage detection method, battery pack, vehicle and storage medium Download PDF

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Publication number
CN114243130A
CN114243130A CN202111560681.3A CN202111560681A CN114243130A CN 114243130 A CN114243130 A CN 114243130A CN 202111560681 A CN202111560681 A CN 202111560681A CN 114243130 A CN114243130 A CN 114243130A
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battery pack
leakage detection
leakage
bms
detection device
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CN114243130B (en
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杰龙清
王燕乐
刘安龙
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Guangzhou Xiaopeng Motors Technology Co Ltd
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Guangzhou Xiaopeng Motors Technology Co Ltd
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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
    • G01M3/40—Investigating fluid-tightness of structures by using electric means, e.g. by observing electric discharges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
    • 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
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • 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
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • 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
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
    • 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
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The embodiment of the invention discloses a battery pack leakage detection method, a battery pack, a vehicle and a storage medium, wherein the battery pack comprises a battery box body assembly, a battery management system BMS, a leakage detection device and an electrical element, the leakage detection device is arranged at the front part of the battery box body assembly, and the leakage detection device is electrically connected with the BMS, and the method comprises the following steps: the BMS monitors the insulation resistance value of the leakage detection device; the BMS detects the leakage condition of the battery pack according to the insulation resistance value; the change of the insulation resistance value is detected in time through a special leakage detection device, so that the leakage detection is realized in time, the leakage detection precision is improved, and the system safety of the battery pack is improved.

Description

Battery pack leakage detection method, battery pack, vehicle and storage medium
Technical Field
The application relates to the technical field of batteries, in particular to a battery pack leakage detection method, a battery pack, a vehicle and a storage medium.
Background
At present, the public acceptance degree and the market share of the pure electric vehicle are gradually improved, and the new vehicle sales volume of the new energy vehicle reaches about 20% of the total vehicle sales volume by 2025 according to the new energy vehicle industry development planning (2021 + 2035). However, with the popularization of pure electric vehicles, public attention to the problem of battery safety is highlighted.
A common safety problem of batteries is liquid leakage, and many use scenes of vehicles can easily cause liquid leakage, for example, side or chassis collision, scraping and bottom supporting phenomena of different degrees can occur in the use process of vehicles, or the sealing performance of a battery pack is influenced due to corrosion and aging of materials, so that liquid leakage occurs; or when the vehicle wades into water, particularly in an area with much rainwater, the situation that water enters the battery pack can occur, and after the water enters the battery pack, a high-voltage system and a battery cell in the battery pack are corroded, so that electrolyte flows out; alternatively, the battery pack may be broken by a collision or other causes to cause a leakage of the coolant. Therefore, if the battery pack leaks, potential safety hazards can be caused, and the safety of the battery pack is affected.
Disclosure of Invention
The embodiment of the invention discloses a battery pack leakage detection method, a battery pack, a vehicle and a storage medium, which can detect the leakage condition of the battery pack in time and improve the safety of a battery pack system.
The first aspect of the embodiment of the invention discloses a method for detecting leakage of a battery pack, wherein the battery pack comprises a battery box body assembly, a battery management system BMS, a leakage detection device and an electrical element, the leakage detection device is arranged at the front part of the battery box body assembly, and the leakage detection device is electrically connected with the BMS, and the method comprises the following steps:
the BMS monitors the insulation resistance value of the leakage detection device;
and the BMS detects the leakage condition of the battery pack according to the insulation resistance value.
As an alternative implementation manner, in the first aspect of the embodiment of the present invention, the battery case assembly includes a lower case and an upper case, and the upper case is covered on the lower case, so that an accommodating cavity for accommodating the BMS, the leakage detecting device, and the electrical component is formed between the upper case and the lower case;
the lower shell is provided with a liquid flow channel on the bottom surface along the peripheral inner wall, and the liquid leakage detection device is arranged on the liquid flow channel at the front part of the lower shell.
As an alternative mode, in the first aspect of the embodiment of the present invention, the electric component includes a plurality of battery modules, the lower case is provided with a plurality of rows of grid spaces in a direction from a back to a front, one of the grid spaces is used for accommodating one of the battery modules, and the liquid flow passages are opened along bottom surfaces of side walls of each row of the grid spaces in the direction from the back to the front of the lower case.
As an alternative implementation, in the first aspect of the embodiment of the present invention, the BMS detecting a leakage of the battery pack according to the insulation resistance value includes:
and the BMS judges whether the insulation resistance value meets a preset resistance value range or not, and determines that the battery pack leaks when the insulation resistance value meets the preset resistance value range.
The second aspect of the embodiment of the invention discloses a battery pack, which comprises a battery box body assembly, a battery management system BMS, a liquid leakage detection device and an electrical element, wherein the liquid leakage detection device is arranged at the front part of the battery box body assembly and is electrically connected with the BMS; wherein the BMS includes:
the monitoring module is used for monitoring the insulation resistance value of the leakage detection device;
and the fault detection module is used for detecting the leakage condition of the battery pack according to the insulation resistance value.
As an alternative implementation manner, in the second aspect of the embodiment of the present invention, the battery case assembly includes a lower case and an upper case, and the upper case is covered on the lower case, so that an accommodating cavity for accommodating the BMS, the leakage detecting device, and the electrical component is formed between the upper case and the lower case;
the lower shell is provided with a liquid flow channel on the bottom surface along the peripheral inner wall, and the liquid leakage detection device is arranged on the liquid flow channel at the front part of the lower shell.
As an alternative, in the second aspect of the embodiment of the present invention, the electric component includes a plurality of battery modules, the lower case is provided with a plurality of rows of grid spaces in a direction from a back to a front, one of the grid spaces is used for accommodating one of the battery modules, and the liquid flow passages are opened along bottom surfaces of side walls of each row of the grid spaces in the direction from the back to the front of the lower case.
A third aspect of an embodiment of the present invention discloses a vehicle, which may include:
the battery pack according to the second aspect of the embodiment of the invention.
A fourth aspect of an embodiment of the present invention discloses a vehicle, which may include:
a memory storing executable program code;
a processor coupled with the memory;
the processor calls the executable program code stored in the memory to execute the battery pack leakage detection method disclosed by the first aspect of the embodiment of the invention.
A fifth aspect of the embodiments of the present invention discloses a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, performs the steps of any one of the methods of the first aspect of the embodiments of the present invention.
A sixth aspect of the embodiments of the present invention discloses a computer program product, which, when run on a computer, causes the computer to perform some or all of the steps of any one of the methods of the first aspect.
A seventh aspect of the present embodiment discloses an application publishing platform, where the application publishing platform is configured to publish a computer program product, where when the computer program product runs on a computer, the computer is caused to perform part or all of the steps of any one of the methods in the first aspect.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, the battery pack comprises a battery box body assembly, a BMS, a leakage detection device and an electrical element, wherein the leakage detection device is arranged at the front part of the battery box body assembly and is electrically connected with the BMS, and the BMS detects the leakage condition of the battery pack according to the insulation resistance value by monitoring the insulation resistance value of the leakage detection device; therefore, by implementing the embodiment of the invention, the change of the insulation resistance value is detected in time through the special leakage detection device, so that the leakage detection in time is realized, the leakage detection precision is improved, and the system safety of the battery pack is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of a communication architecture of a battery pack and a background server in a vehicle according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a battery pack according to an embodiment of the present invention;
fig. 3 is a schematic flow chart illustrating a method for detecting leakage of a battery pack according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a battery pack leakage detection method according to a second embodiment of the present invention;
fig. 5 is a schematic flow chart of a battery pack leakage detection method disclosed in the third embodiment of the present invention;
fig. 6 is a schematic structural view of a BMS disclosed in an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a vehicle according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first", "second", "third", and "fourth" and the like in the description and the claims of the present invention are used for distinguishing different objects, and are not used for describing a specific order. The terms "comprises," "comprising," and any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "center", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
First, referring to fig. 1, fig. 1 is a schematic view of a communication architecture of a battery pack and a background server in a vehicle according to an embodiment of the present invention; the communication architecture shown in fig. 1 includes a battery pack and a background server, where the battery pack CAN transmit a signal to be transmitted to a control system (e.g., a vehicle-mounted T-BOX) of the entire vehicle through an entire vehicle CAN network, and the signal is transmitted to the background server by the control system through an entire vehicle wireless network. And after receiving the signal sent by the battery pack, the background server analyzes and processes the signal. For example, when a battery pack leaks, relevant parameters for indicating leakage and fault reasons obtained according to relevant parameter analysis are obtained and then sent to a control system through a CAN network, the control system is sent to a background server through a whole vehicle wireless network, the background server further analyzes the relevant parameters, the fault reasons and the like to obtain more fault information including fault reasons, places, time, reasons possibly causing faults, processing modes and the like and then feeds the fault information back to the control system of the vehicle, and therefore a vehicle owner CAN perform corresponding processing according to the processing modes fed back by the background server to improve driving safety.
Further, please refer to fig. 2, fig. 2 is a schematic structural diagram of a battery pack according to an embodiment of the present invention; referring to fig. 2, the battery pack according to the embodiment of the present invention includes a battery case assembly (not shown), a BMS (not shown), a leakage detecting device 21 (shown in the figure only in a simple structure), and an electrical component (not shown), wherein the leakage detecting device 21 is disposed at a front portion of the battery case assembly, and the leakage detecting device 21 is electrically connected to the BMS.
In the embodiment of the present invention, the installation position of the liquid leakage detecting device 21 on the battery box assembly may be specifically determined according to the actual installation condition of the battery pack on the whole vehicle, for example, when the battery pack is installed on the whole vehicle, the front part of the battery pack is slightly lower than the back part of the battery pack, and then the design of arranging the liquid leakage detecting device 21 on the front part of the battery box assembly may be adopted, so that when the battery pack leaks, liquid flows to the front part of the battery box assembly, and thus the liquid leakage detecting device 21 can better detect whether liquid leakage occurs, and the probability and accuracy of detecting whether liquid leakage occurs by the liquid leakage detecting device 21 can be improved.
Therefore, it can be understood that the leakage detecting device 21 may be disposed on the back of the battery box assembly when the back portion of the battery pack is slightly lower than the front portion in the entire vehicle installation, or the leakage detecting device 21 may be disposed on the left side wall of the battery box assembly close to the bottom surface when the left side of the battery pack is slightly lower than the right side in the entire vehicle installation, so as to more effectively detect whether the battery pack leaks.
Optionally, the leakage detecting device 21 may be a leakage sensor, and the leakage sensor may detect an insulation resistance value of the leakage sensor, so as to determine leakage according to the insulation resistance value.
Further, the battery case assembly includes a lower case 22 and an upper case (not shown), and the upper case is covered on the lower case 22, so that a receiving cavity (not shown) for receiving the BMS, the leakage detecting device 21, and the electrical components is formed between the upper case and the lower case 22;
the lower case 22 has a liquid flow path 23 formed on a bottom surface along the peripheral inner wall, and the leakage detecting device 21 is provided on the liquid flow path 23 in the front portion of the lower case 22.
Wherein, the liquid flow channel 23 that sets up the intercommunication on the position that the inner wall is close to the bottom surface all around of lower casing 22, when the weeping appears, liquid will flow to weeping detection device 21 through liquid flow channel 23, further ensures that liquid can be detected in time by weeping detection device 21 and obtains. Therefore, in the embodiment of the invention, the communicated liquid flow channel 23 is arranged at the position, close to the inner wall, on the bottom surface of the lower shell of the battery box assembly, so that when liquid leakage occurs at any place, liquid can flow into the liquid flow channel 23, the liquid leakage sensor 21 can timely detect the liquid leakage through the liquid flow channel 23, and the timeliness and the accuracy of liquid leakage detection are improved by combining the liquid leakage sensor 21 and the liquid flow channel 23.
Further, the electric component includes a plurality of battery modules (not shown in the drawings), the lower case 22 is provided with a plurality of rows of cell spaces (not shown in the drawings) in the direction from the back to the front, one cell space is used to accommodate one battery module, and liquid flow passages 23 are provided in the bottom surface along the side walls of each row of cell spaces in the direction from the back to the front of the lower case 22.
That is, the lower case 22 adopts a design of lattice space, and when the upper case is covered on the lower case 22, a plurality of receiving cavities of lattice space are obtained, and one cell space is provided with one battery module. Because the lattice spaces are isolated, in order to ensure that the leakage detection device 21 can detect leakage in time when a battery module in any one lattice space leaks, in the embodiment of the invention, the liquid flow channels 23 are arranged on the bottom surface of each row of lattice spaces along the side walls from the back to the front of the lower shell 22, all the liquid flow channels 23 are communicated, and when leakage occurs in any one battery module, the leakage can be ensured to enter the liquid flow channels 23, so that the leakage detection device 21 can detect leakage in time.
Further, the electrical components include a Battery Disconnection Unit (BDU), a high-low voltage connector, a wire harness, and the like, which are reasonably disposed in the accommodating chamber and will not be described in detail herein.
Preferably, the upper shell and the lower shell 21 are made of aluminum alloy materials, so that the light weight of the battery pack shell can be realized, and the aluminum alloy has good heat dissipation performance and can quickly dissipate heat. And the BMS shell can adopt the all-metal design, and electromagnetic shield is effectual, can guarantee the security of using.
Furthermore, the upper shell can be provided with a groove, the groove is used for pasting a nameplate, the nameplate is used for recording various use parameters of the battery pack, and the groove can be formed simultaneously when the upper shell is stamped so as to reduce the process flow.
Alternatively, the upper and lower cases 22 and 22 are formed by a stamping process, and a plurality of grid spaces, liquid flow passages 23, etc. are stamped on the bottom surface of the lower case 22, and of course, a plurality of fixing holes are stamped on the lower and upper cases 22 and 22 for fixing the lower and upper cases 22 and 22 by screws, bolts, etc., which are not shown in fig. 2.
Further, on the basis of the battery pack introduced above, the embodiment of the invention discloses a battery pack leakage detection method, a battery pack, a vehicle and a storage medium, which can detect the leakage situation of the battery pack in time and improve the safety of a battery pack system. The embodiments of the present invention will be described in detail below with reference to specific examples.
Referring to fig. 3, fig. 3 is a schematic flow chart illustrating a method for detecting leakage of a battery pack according to an embodiment of the present invention; as shown in fig. 3, the battery pack is embodied as the battery pack described above, and the method for detecting leakage of the battery pack may include:
301. BMS monitors the insulation resistance of the liquid leakage detection device.
After the leakage detection device 21 is arranged in the battery pack, the insulation resistance of the leakage detection device 21 is monitored by the BMS in real time.
302. And the BMS detects the leakage condition of the battery pack according to the insulation resistance value.
In the embodiment of the invention, the BMS can be filtered, when the insulation resistance value is monitored, the insulation resistance value is filtered, the obvious and unreasonable insulation resistance value is eliminated, the remaining reasonable insulation resistance value is judged, and the leakage condition of the battery pack is detected.
By implementing the embodiment, the change of the insulation resistance value is detected in time through the special leakage detection device, so that the leakage detection in time is realized, the leakage detection precision is improved, and the system safety of the battery pack is improved.
Referring to fig. 4, fig. 4 is a schematic flow chart illustrating a battery pack leakage detection method according to a second embodiment of the present invention; as shown in fig. 4, the battery pack is embodied as the battery pack described above, and the method for detecting leakage of the battery pack may include:
401. BMS monitors the insulation resistance of the liquid leakage detection device.
402. The BMS judges whether the battery pack leaks or not according to the insulation resistance value; if it is determined that there is a leak, the process proceeds to step 403, and if it is determined that there is no leak, the process ends.
403. And the BMS performs leakage fault early warning.
The battery pack comprises a battery box body assembly, a BMS, a leakage detection device and an electrical element, wherein the leakage detection device is arranged at the front part of the battery box body assembly and is electrically connected with the BMS; therefore, by implementing the embodiment of the invention, the change of the insulation resistance value is detected in time through the special leakage detection device, so that the leakage detection in time is realized, the leakage detection precision is improved, and the system safety of the battery pack is improved.
Referring to fig. 5, fig. 5 is a schematic flow chart illustrating a battery pack leakage detection method according to a third embodiment of the present invention; as shown in fig. 5, the method for detecting leakage of a battery pack may include:
501. BMS monitors the insulation resistance of the liquid leakage detection device.
502. The BMS judges whether the insulation resistance value meets a preset resistance value range or not; if the preset resistance value range is satisfied, the process goes to step 503, and if the preset resistance value range is not satisfied, the process is ended.
The preset resistance range comprises a resistance range corresponding to leaked cooling liquid, a resistance range corresponding to leaked water or a resistance range corresponding to leaked electrolyte.
It is understood that the leakage may be electrolyte, coolant, water, etc., and the insulation resistance values corresponding to different leakage may be different, and when no leakage occurs in the battery pack, the insulation resistance value of the leakage detecting device 21 may be infinite. Therefore, in the embodiment of the present invention, the BMS stores a plurality of preset resistance ranges in advance for specifically determining which kind of leaking liquid, that is, the preset resistance range includes a resistance range corresponding to the leaking coolant, a resistance range corresponding to the leaking water, or a resistance range corresponding to the leaking electrolyte.
For example, when the cooling liquid leaks, the insulation resistance is about 5 megaohms, and then the resistance range corresponding to the leaking cooling liquid can be a resistance range centered at 5 megaohms; when water leaks, the insulation resistance is less than 500 kilo-ohms, and the resistance range corresponding to the water leakage can be a resistance range less than 500 kilo-ohms.
The resistance value ranges corresponding to various leakage liquids are stored in the BMS in advance, and the specific leakage liquid can be analyzed according to the insulation resistance value detected by the leakage liquid detection device 21 in real time so as to analyze the rough reason.
503. The BMS generates a fault reason and executes preset leakage fault early warning, the fault reason is coolant leakage or water leakage or electrolyte leakage, the preset leakage fault early warning comprises at least one of triggering leakage fault treatment measures to achieve a driving power limit function, displaying a leakage fault signal identification indicating the fault reason on a vehicle-mounted display screen to achieve warning information prompt and sending the leakage fault signal identification to vehicle wireless communication equipment.
In the embodiment of the present invention, after the analysis in step 502, the BMS can obtain what kind of leakage is, further analyze the cause of the leakage failure, and then perform the preset leakage failure warning.
Specifically, detecting the weeping, BMS CAN pass through the CAN network with the fault signal sign of instructing the weeping trouble and export to whole car panel board or big screen on to the mode suggestion user through showing, simultaneously, the power limit function when will setting up whole car driving reminds the user in time to maintain the vehicle, with system safety and the driving safety that improves the battery package.
And/or when liquid leakage is detected, the BMS reports the fault to a whole vehicle control system (such as T-BOX) through the CAN network, and then the whole vehicle control system reports the fault to a background server through a whole vehicle wireless network, so that a customer service CAN follow up in time and remind a user through a corresponding APP or wireless communication equipment of the user to maintain the vehicle in time.
And/or when liquid leakage is detected, the BMS reports the fault to a whole vehicle control system (such as T-BOX) through the CAN network, and then the whole vehicle control system sends the fault to wireless communication equipment of a user through a whole vehicle wireless network so as to directly remind the user of timely vehicle maintenance.
Optionally, a plurality of insulation detection points of the battery pack are further arranged on the lower shell 22 included in the battery box assembly of the battery pack, and insulation status of the battery pack is evaluated according to the insulation resistance value of each insulation detection point. Furthermore, the judgment result of the insulation resistance value of each insulation detection point and the analysis result of the insulation resistance value of the leakage detection device 21 are combined to further analyze the leakage fault reason and the like, so that the leakage detection accuracy is improved.
In the embodiment, the BMS can effectively analyze whether the battery pack leaks or not according to the insulation resistance value by monitoring the insulation resistance value of the leakage sensor 21 in real time, and can analyze which leakage is specific, and perform preset leakage fault early warning to improve the detection precision; and because the battery pack is provided with the leakage detection device 21 and the liquid flow channel 23, the risk of false alarm can be effectively eliminated, and the leakage detection precision is improved.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a BMS disclosed in the embodiments of the present invention; as shown in fig. 6, the battery pack includes a battery case assembly, a battery management system BMS, a leakage detecting device and an electrical component, the leakage detecting device is disposed in the front of the battery case assembly, the leakage detecting device is electrically connected with the BMS, and the BMS specifically includes:
the monitoring module 601 is used for monitoring the insulation resistance value of the leakage detection device;
and the fault detection module 602 is used for detecting the leakage condition of the battery pack according to the insulation resistance value.
Further, referring to fig. 6, the BMS disclosed in the embodiment of the present invention further includes:
and the fault early warning module 603 is configured to perform leakage fault early warning when the fault detection module 602 determines that the battery pack leaks.
Through implementing above-mentioned battery package, in time detect the change of insulation resistance through dedicated weeping detection device to realize timely weeping and detect, improve weeping and detect the precision, improve the system security of battery package.
Further, the manner that the fault detection module 602 is used for detecting the leakage condition of the battery pack according to the insulation resistance value is specifically as follows:
judging whether the insulation resistance value meets a preset resistance value range or not, and determining leakage of the battery pack when the insulation resistance value meets the preset resistance value range;
the fault early warning module 603 is configured to perform a leakage fault early warning when determining that the battery pack leaks, specifically:
when the insulation resistance value is determined to meet the preset resistance value range, generating a fault reason, and executing preset leakage fault early warning, wherein the fault reason is leakage of cooling liquid or leakage of electrolyte, the preset leakage fault early warning comprises at least one of triggering leakage fault treatment measures to realize a driving limit power function, displaying a leakage fault signal identification for indicating the fault reason on a vehicle-mounted display screen to realize alarm information prompt, and sending the leakage fault signal identification to vehicle wireless communication equipment.
Through above-mentioned embodiment, BMS passes through real-time supervision weeping sensor 21's insulating resistance, according to the effectual analysis of insulating resistance go out the battery package whether weeping, and can analyze out and specifically what kind of weeping to carry out predetermined weeping trouble early warning, improve the detection precision.
The embodiment of the invention also discloses a vehicle, which can comprise: the battery pack disclosed in the above embodiment.
Specifically, please refer to the above description for more contents related to the battery pack, which is not further described herein.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a vehicle according to an embodiment of the disclosure; the vehicle shown in fig. 7 may include:
a memory 701 in which executable program code is stored;
a processor 702 coupled to the memory 701;
the processor 702 calls the executable program code stored in the memory 701 to execute a part of or all of the steps of the battery pack leakage detection method shown in any one of fig. 3 to 5.
The embodiment of the invention also discloses a computer readable storage medium which stores a computer program, wherein the computer program enables a computer to execute the battery pack leakage detection method disclosed in the figures 3 to 5.
An embodiment of the present invention further discloses a computer program product, which, when running on a computer, causes the computer to execute part or all of the steps of any one of the methods disclosed in fig. 3 to 5.
An embodiment of the present invention further discloses an application publishing platform, where the application publishing platform is configured to publish a computer program product, where when the computer program product runs on a computer, the computer is enabled to execute part or all of the steps of any one of the methods disclosed in fig. 3 to fig. 5.
It will be understood by those skilled in the art that all or part of the steps in the methods of the embodiments described above may be implemented by hardware instructions of a program, and the program may be stored in a computer-readable storage medium, where the storage medium includes Read-Only Memory (ROM), Random Access Memory (RAM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), One-time Programmable Read-Only Memory (OTPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Compact Disc Read-Only Memory (CD-ROM), or other Memory, such as a magnetic disk, or a combination thereof, A tape memory, or any other medium readable by a computer that can be used to carry or store data.
The above detailed description is provided for the battery pack leakage detection method, the battery pack, the vehicle and the storage medium disclosed in the embodiments of the present invention, and a specific example is applied in the present document to explain the principle and the implementation of the present invention, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (10)

1. A battery pack leakage detection method is characterized in that the battery pack comprises a battery box body assembly, a battery management system BMS, a leakage detection device and an electrical element, the leakage detection device is arranged at the front part of the battery box body assembly, the leakage detection device is electrically connected with the BMS, and the method comprises the following steps:
the BMS monitors the insulation resistance value of the leakage detection device;
and the BMS detects the leakage condition of the battery pack according to the insulation resistance value.
2. The method of claim 1, wherein:
the battery box assembly comprises a lower shell and an upper shell, wherein the upper shell is covered on the lower shell, so that an accommodating cavity for accommodating the BMS, the leakage detection device and the electrical element is formed between the upper shell and the lower shell;
the lower shell is provided with a liquid flow channel on the bottom surface along the peripheral inner wall, and the liquid leakage detection device is arranged on the liquid flow channel at the front part of the lower shell.
3. The method according to claim 2, wherein the electrical component includes a plurality of battery modules, the lower case is provided with a plurality of rows of cell spaces in a back-to-front direction, one of the cell spaces is used for accommodating one of the battery modules, and the liquid flow passages are opened in a bottom surface along side walls of each row of the cell spaces in a back-to-front direction of the lower case.
4. The method according to any one of claims 1 to 3, wherein the BMS detects a leakage of the battery pack according to the insulation resistance value, including:
and the BMS judges whether the insulation resistance value meets a preset resistance value range or not, and determines that the battery pack leaks when the insulation resistance value meets the preset resistance value range.
5. A battery pack is characterized by comprising a battery box body assembly, a battery management system BMS, a leakage detection device and an electrical element, wherein the leakage detection device is arranged at the front part of the battery box body assembly and is electrically connected with the BMS; wherein the BMS includes:
the monitoring module is used for monitoring the insulation resistance value of the leakage detection device;
and the fault detection module is used for detecting the leakage condition of the battery pack according to the insulation resistance value.
6. The battery pack according to claim 5, wherein:
the battery box assembly comprises a lower shell and an upper shell, wherein the upper shell is covered on the lower shell, so that an accommodating cavity for accommodating the BMS, the leakage detection device and the electrical element is formed between the upper shell and the lower shell;
the lower shell is provided with a liquid flow channel on the bottom surface along the peripheral inner wall, and the liquid leakage detection device is arranged on the liquid flow channel at the front part of the lower shell.
7. The battery pack according to claim 6, wherein the electric component includes a plurality of battery modules, the lower case is provided with a plurality of rows of lattice spaces in a back-to-front direction, one of the lattice spaces is used to accommodate one of the battery modules, and the liquid flow passages are opened in a bottom surface along side walls of each row of the lattice spaces in a back-to-front direction of the lower case.
8. A vehicle, characterized by comprising:
the battery pack according to any one of claims 5 to 7.
9. A vehicle, characterized by comprising:
a memory storing executable program code;
a processor coupled with the memory;
the processor calls the executable program code stored in the memory to execute the battery pack leakage detection method according to any one of claims 1 to 4.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 4.
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