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CN104201433B - Battery management system and battery management method for vehicle and vehicle - Google Patents

Battery management system and battery management method for vehicle and vehicle Download PDF

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Publication number
CN104201433B
CN104201433B CN201410432661.1A CN201410432661A CN104201433B CN 104201433 B CN104201433 B CN 104201433B CN 201410432661 A CN201410432661 A CN 201410432661A CN 104201433 B CN104201433 B CN 104201433B
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China
Prior art keywords
vehicle
battery
insulation resistance
battery pack
insulation
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CN201410432661.1A
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Chinese (zh)
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CN104201433A (en
Inventor
狄彼德
彦斯·贝肯
罗伯特·丁力
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Ooros Automotive Co Ltd
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Ooros Automotive Co Ltd
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Priority to CN201410432661.1A priority Critical patent/CN104201433B/en
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Classifications

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

Abstract

The invention discloses a battery management system and a battery management method for a vehicle and a vehicle. In the battery management system, a connecting module is connected with a first detecting module, when an insulation fault signal is received, an anode or cathode of a battery pack is controlled to be disconnected from a wiring terminal of a motor of the vehicle; after the anode or cathode of the battery pack is disconnected from the wiring terminal of the motor of the vehicle, the first detection module detects a first insulation resistance between the anode or cathode of the battery pack and a battery box body and compares the first insulation resistance with a first threshold; an informing module is connected with the first detection module, when the first insulation resistance is less than or equal to the first threshold, the vehicle is informed of reducing condensed water in the battery box body; after the condensed water is reduced, the first detection module detects a second insulation resistance between the anode or cathode of the battery pack and the battery box body and compares the second insulation resistance with the first threshold; when the second insulation resistance is greater than the first threshold, the connecting module controls connection of the anode or cathode of the battery pack with the wiring terminal of the motor of the vehicle.

Description

Battery management system and method for vehicle and vehicle
Technical Field
The present invention relates to battery pack technology, and more particularly, to a battery management system and method for a vehicle, and a vehicle including the same.
Background
Insulation protection of High Voltage (HV) systems of electric or hybrid vehicles is a fundamental safety requirement. Firstly, the high-voltage system and the vehicle chassis need to be electrically isolated, the electrical isolation requires insulation of a positive electrode and a negative electrode of the high-voltage system and the vehicle chassis, and a user can be in a dangerous condition only when the two kinds of insulation break down. Secondly, the battery box and the metal in the battery box, which is not part of any circuit, also need to be electrically isolated, which can be done by grounding the vehicle chassis.
Insulation fault detection is a basic safety protection mechanism, and is continuously performed during the operation of a battery pack, so that the insulation grade between a charged component in a high-voltage system and a vehicle chassis can be timely detected. Typically, insulation fault detection before detecting that the insulation between the positive or negative pole of the high voltage system and the vehicle chassis is faulty, i.e. the user is in a dangerous situation, takes safety measures, such as directly removing the high voltage potential, or shutting down the BATTERY by a control device or BATTERY management system (BATTERY MANAGEMENT SYSTEM, BMS) and electrically isolating the BATTERY pack from the rest of the vehicle to avoid further electrical hazards.
The insulation fault may be caused by insulation fault between the battery pack and the vehicle or by insulation fault inside the battery pack, and the internal insulation fault is caused by that external air with dust enters the battery pack and forms condensed water after being cooled. The conventional insulation fault detection is difficult to distinguish the formation cause of the insulation fault, when the insulation fault occurs, namely a high-voltage power supply is removed or cut off, high-voltage electrical components (such as a traction motor for pushing a vehicle) cannot be restarted, so that the performance of the vehicle can be immediately reduced, and even secondary dangerous conditions can be caused by the loss of electric drive.
Disclosure of Invention
The present invention has been made in view of the above problems, and aims to provide a battery management system for a vehicle, a method, and a vehicle that overcome or at least partially solve the above problems.
According to an aspect of the present invention, there is provided a battery management system for a vehicle including a battery pack and a battery case for housing the battery pack, characterized by comprising: the device comprises a connection module, a first detection module and a notification module; the connection module is connected with the first detection module and is configured to control the positive pole or the negative pole of the battery pack to be disconnected from a wiring terminal of a motor of a vehicle when the insulation fault signal is received; the first detection module is configured to detect a first insulation resistance between the positive electrode or the negative electrode of the battery pack and the battery box and compare the first insulation resistance with a preset first threshold value after the connection module controls the positive electrode or the negative electrode of the battery pack to be disconnected from a connection terminal of a motor of a vehicle; the notification module is connected with the first detection module and is configured to notify a vehicle to reduce condensed water in the battery box when the first insulation resistance is smaller than or equal to a first threshold value; the first detection module is further configured to detect a second insulation resistance between a positive electrode or a negative electrode of a battery pack and the battery case and compare with the first threshold value after reducing the condensed water in the battery case; the connection module is further configured to control connection of a positive electrode or a negative electrode of the battery pack with a connection terminal of a motor of the vehicle when the second insulation resistance is greater than a first threshold value.
Optionally, in the battery management system according to the embodiment of the invention, the notification module is further configured to generate and send an external insulation fault message to the vehicle when the first insulation resistance is greater than a first threshold; an internal insulation fault message is generated and transmitted to the vehicle when the first insulation resistance is less than or equal to a first threshold value, and a notification signal is generated and transmitted to the vehicle after the internal insulation fault message is generated and transmitted to the vehicle, notifying the vehicle to reduce the condensed water in the battery box.
Optionally, in the battery management system according to an embodiment of the present invention, the notification module is further configured to generate and transmit an internal insulation fault message to the vehicle when the second insulation resistance is less than or equal to a first threshold value.
Optionally, in the battery management system according to an embodiment of the present invention, the notification module is configured to notify a vehicle to send a control instruction for increasing the temperature inside the battery box to a heating element inside the battery box to reduce the condensed water inside the battery box.
Optionally, in the battery management system according to an embodiment of the present invention, the notification module is configured to notify the vehicle to send a control instruction for reducing humidity of gas entering the battery box or increasing temperature of gas entering the battery box to the heating ventilation and air conditioning control system to reduce condensed water inside the battery box.
Optionally, in the battery management system according to an embodiment of the present invention, the system further includes a second detection module connected to the connection module, configured to detect a third insulation resistance between the positive or negative electrode of the battery pack and the vehicle chassis after the positive or negative electrode of the battery pack is connected to the connection terminal of the motor of the vehicle and compare with a preset second threshold, and send an insulation fault signal to the connection module when the third insulation resistance is less than or equal to the second threshold.
Optionally, in the battery management system according to an embodiment of the present invention, the first detection module is further configured to detect a fourth insulation resistance between the positive or negative electrode of the battery pack and the battery case and compare with the first threshold before the positive or negative electrode of the battery pack is connected to a connection terminal of a motor of a vehicle; the connection module is further configured to connect the positive or negative electrode of the battery pack with a connection terminal of a motor of a vehicle when the fourth insulation resistance is greater than a first threshold value; the notification module is further configured to send an interior insulation fault message to a vehicle when the fourth insulation resistance is less than or equal to a first threshold.
According to another aspect of the present invention, there is also provided a gasoline-electric hybrid vehicle or an electric vehicle including: a battery pack and a battery case for housing the battery pack, and a battery management system according to the present invention.
Optionally, in the hybrid electric vehicle or the electric vehicle according to the embodiment of the invention, a fault management device is further included to receive a fault message sent by the battery management system.
According to still another aspect of the present invention, there is also provided a battery management method for a vehicle including a battery pack and a battery box for housing the battery pack, characterized by comprising: controlling the positive pole or the negative pole of the battery pack to be disconnected from a connection terminal of a motor of the vehicle when the insulation fault signal is received; detecting a first insulation resistance between the positive or negative electrode of the battery pack and the battery case and comparing with the first threshold value after the positive or negative electrode of the battery pack is disconnected from a connection terminal of a motor of a vehicle; when the first insulation resistance is smaller than or equal to a first threshold value, informing a vehicle to reduce condensed water in the battery box body; detecting a second insulation resistance between a positive electrode or a negative electrode of a battery pack and the battery case and comparing with the first threshold value after reducing the condensed water in the battery case; and when the second insulation resistance is larger than the first threshold value, controlling the positive pole or the negative pole of the battery pack to be connected with a connecting terminal of a motor of the vehicle.
Optionally, in a method according to an embodiment of the invention, an external insulation fault message is generated and sent to the vehicle when the first insulation resistance is greater than a first threshold; an internal insulation fault message is generated and transmitted to the vehicle when the first insulation resistance is less than or equal to a first threshold value, and a notification signal is generated and transmitted to the vehicle after the internal insulation fault message is generated and transmitted to the vehicle, notifying the vehicle to reduce the condensed water in the battery box.
Optionally, in a method according to an embodiment of the invention, an internal insulation fault message is generated and sent to the vehicle when the second insulation resistance is less than or equal to a first threshold value.
Optionally, in a method according to an embodiment of the invention, the step of notifying the vehicle of the reduction of the condensed water in the battery box includes: and informing a vehicle to send a control instruction for increasing the temperature in the battery box to a heating element in the battery box so as to reduce the condensed water in the battery box.
Optionally, in a method according to an embodiment of the invention, the step of notifying the vehicle of the reduction of the condensed water in the battery box includes: and informing the vehicle to send a control instruction for reducing the humidity of the gas entering the battery box body or improving the temperature of the gas entering the battery box body to a heat supply ventilation and air conditioning control system so as to reduce the condensed water in the battery box body.
Optionally, in the method according to the embodiment of the present invention, the method further includes: after the step of connecting the positive or negative electrode of the battery pack to the connection terminal of the motor of the vehicle, a third insulation resistance between the positive or negative electrode of the battery pack and the vehicle chassis is detected and compared with the second threshold value, and an insulation failure signal is transmitted when the third insulation resistance is less than or equal to the second threshold value.
Optionally, in the method according to the embodiment of the present invention, the method further includes: detecting a fourth insulation resistance between the positive or negative electrode of the battery pack and the battery case and comparing with the first threshold value, before the step of connecting the positive or negative electrode of the battery pack and the connection terminal of the motor of the vehicle; connecting the positive electrode or the negative electrode of the battery pack with a connection terminal of a motor of the vehicle when the fourth insulation resistance is greater than a first threshold value; generating and transmitting an internal insulation fault message to the vehicle when the fourth insulation resistance is less than or equal to the first threshold value.
The invention provides a battery management system and a battery management method for a vehicle and the vehicle. According to the embodiment of the invention, during normal operation of the vehicle, once an insulation fault is detected, the circuit inside the battery case can be disconnected from the circuit outside the battery case. The internal insulation resistance of the battery case was then checked. If the insulation resistance inside the battery case is less than or equal to the first threshold value, it can be determined that there is an insulation failure at least inside the battery case. When the insulation fault in the battery box body is detected during the normal running of the vehicle, the treatment of reducing the condensed water in the battery box body can be carried out, so that the insulation resistance between the anode or the cathode of the battery pack and the battery box body is improved, the insulation fault in the battery box body is repaired, and the running reliability of the vehicle is improved. In addition, if the battery case internal insulation resistance is greater than the first threshold value, it may be determined that the insulation fault detected before is a battery case external insulation fault. According to the embodiment of the invention, whether the insulation fault detected in the normal running period of the vehicle is the insulation fault outside the battery box body or the insulation fault inside the battery box body can be distinguished, so that a vehicle driver can know the reason of the insulation fault, and can take corresponding measures to solve the insulation fault in time, the running reliability of the vehicle is improved, and the safety of the vehicle driver and passengers is ensured.
Further, after the insulation fault inside the battery box is repaired, whether the insulation resistance between the anode or the cathode of the battery pack and the battery box is greater than the first threshold value or not can be detected again, and when the insulation resistance between the anode or the cathode of the battery pack and the battery box is greater than the first threshold value, a command for receiving the connection between the circuit inside the battery box and the circuit outside the battery box can be triggered, so that the circuit inside the battery box is connected with the circuit outside the battery box, the restart operation of the battery pack is realized, and the high-voltage electric element (such as a traction motor of a vehicle) of the vehicle can continue to operate. To avoid degradation of vehicle performance and to avoid the occurrence of a secondary hazard situation that may result from loss of electric drive.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
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 invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 schematically shows a block diagram of a battery management system for a vehicle according to an embodiment of the present invention;
FIG. 2 schematically illustrates an electrical schematic diagram of an electric or hybrid vehicle according to an embodiment of the present invention;
FIG. 3 schematically illustrates a circuit schematic for measuring insulation resistance according to an embodiment of the present invention;
FIG. 4 schematically shows a flow chart of a battery management method for a vehicle according to an embodiment of the invention; and
fig. 5 schematically shows a second flowchart of a battery management method for a vehicle according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It will thus be appreciated that those skilled in the art will be able to devise various arrangements which, although not explicitly described or shown herein, embody the present invention and are included within its spirit, principle and scope.
All examples and conditional language recited in the specification are intended for purposes of illustration and teaching to aid the reader in understanding the principles and the concepts contributed by the inventor to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions.
Furthermore, all descriptions and illustrations in this specification that recite principles, aspects, and embodiments of the invention and specific examples thereof are intended to cover structural and functional equivalents or equivalents thereof. Additionally, it is intended that such equivalents and equivalents include both currently known equivalents as well as equivalents developed in the future, i.e., developed products that perform the same function, regardless of structure.
It should be understood by those skilled in the art that the block diagrams presented in the figures of this specification represent schematic representations of structures or circuits that implement the present invention. Similarly, it will be appreciated that any flow charts and the like presented in the drawings of the specification represent various processes which may actually be performed by various computers or processors, whether or not such computers or processors are explicitly shown in the figures.
In the claims hereof, a module for performing a specified function is intended to encompass any way of performing that function including, for example, (a) a combination of circuit elements that performs that function or (b) software in any form, including, therefore, firmware, microcode or the like, combined with appropriate circuitry for executing that software to perform the function. The functions provided by the various modules are combined together in the manner claimed and it should therefore be considered that any module, component or element which can provide these functions is equivalent to the module defined in the claims.
The term "embodiment" in the specification means that a specific feature, structure, or the like described in connection with the embodiment is included in at least one embodiment of the invention, and thus, the appearance of the term "in an embodiment" in various places in the specification does not necessarily refer to the same embodiment.
According to a first aspect of the present invention, there is provided a battery management system for a vehicle including a battery pack and a battery case for housing the battery pack. As shown in fig. 1, a battery management system 100 for a vehicle according to an embodiment of the present invention may mainly include: a connection module 103, a first detection module 105, and a notification module 107. It should be understood that the connection relationship of the modules shown in fig. 1 is only an example, and those skilled in the art can adopt other connection relationships as long as the modules can also achieve the purpose of the present invention in such connection relationship.
In this specification, the functions of the respective modules may be realized by using dedicated hardware or hardware capable of executing processing in combination with appropriate software. Such hardware or dedicated hardware may include Application Specific Integrated Circuits (ASICs), various other circuits, various processors, and the like. When implemented by a processor, the functions may be provided by a single dedicated processor, by a single shared processor, or by a plurality of individual processors, some of which may be shared. Additionally, a processor should not be understood to refer exclusively to hardware capable of executing software, but may implicitly include, without limitation, Digital Signal Processor (DSP) hardware, Read Only Memory (ROM) for storing software, Random Access Memory (RAM), and non-volatile storage.
Fig. 2 schematically shows a circuit diagram of a power part in an electric or hybrid vehicle, wherein the current output by the battery pack 203 in the battery box 201 can be converted by the inverter 207 and then transmitted to the motor 209. Specifically, when the contactor 205 is in a closed state, the positive or negative electrode of the battery pack 203 inside the battery case 201 may be connected to the connection terminal of the motor 209 outside the battery case 201 through the contactor 205.
According to the embodiment of the invention, the connection module 103 is connected with the first detection module 105 and configured to control the positive pole or the negative pole of the battery pack (such as the battery pack 203 in the battery box 201 shown in fig. 2) to be disconnected from the connection terminal of the motor (such as the motor 209 shown in fig. 2) of the vehicle when receiving the insulation fault signal.
Optionally, as shown in fig. 1, the battery management system 100 for a vehicle according to an embodiment of the present invention may further include a second detection module 101 connected to the connection module 103, configured to detect a third insulation resistance between the positive or negative electrode of the battery pack and the vehicle chassis and compare the third insulation resistance with a preset second threshold value after the positive or negative electrode of the battery pack is connected to the connection terminal of the motor of the vehicle, and send an insulation fault signal to the connection module 103 when the third insulation resistance is less than or equal to the second threshold value. The connection module 103 may be configured to disconnect the positive electrode or the negative electrode of the battery pack from the connection terminal of the motor of the vehicle upon receiving the insulation fault signal sent by the second detection module 101, and indeed, may be communicatively connected to a fault management device of the vehicle in the prior art to receive the insulation fault signal sent by the system vehicle fault management device.
According to an embodiment of the present invention, after the connection module 103 controls the positive electrode or the negative electrode of the battery pack to be disconnected from the connection terminal of the motor of the vehicle, the first detection module 105 detects a first insulation resistance between the positive electrode or the negative electrode of the battery pack and the battery case and compares the first insulation resistance with a preset first threshold value.
In the embodiment of the present invention, the values of the preset first threshold and the preset second threshold may be set as follows: international standards for electric vehicles stipulate: the result of dividing the insulation resistance value by the nominal voltage U of the direct current system of the electric automobile is larger than 100 omega/V, and the safety requirement is met. Therefore, in an embodiment of the present invention, the preset first threshold and the preset second threshold may be set according to the international standard of the electric vehicle, that is, the preset first threshold and the preset second threshold are set according to the international standard of the electric vehicle: (the preset insulation resistance threshold value/the nominal voltage U of the direct current system of the electric automobile) > 100 omega/V. It should be understood that, in the embodiment of the present invention, specific values of the preset first threshold and the preset second threshold are not limited.
In an embodiment of the present invention, the first detection module 105 may measure a first insulation resistance value between the positive electrode or the negative electrode of the battery pack and the battery box using an insulation resistance measurement circuit as shown in fig. 3, and the second detection module 101 may also measure a third insulation resistance value between the positive electrode or the negative electrode of the battery pack and the vehicle chassis using an insulation resistance measurement circuit as shown in fig. 3. It is of course understood that the specific manner in which the first and second detection modules 105 and 101 measure the first and third insulation resistance values of the battery pack is not limited in the embodiments of the present invention.
See fig. 3, falseThe voltage of a direct current system (namely the voltage of a power battery) of an Electric Vehicle (Electric Vehicle) or a hybrid Electric Vehicle is set to be U, and insulation resistances between a positive electrode and a negative electrode of the power battery to be tested and a battery box body or a Vehicle chassis are respectively set to be RP、RNThe voltages between the positive electrode and the negative electrode and the battery box body or the vehicle chassis are respectively UP、UNThen, the equivalent model of the dc system to be measured is shown in the dashed box of fig. 3.
The measurement principle is shown in FIG. 3, wherein RC1、RC2Is a standard resistor of known resistance for measurement. The working principle is as follows:
when the switches S1 and S2 are all turned off, the voltages between the positive pole and the negative pole of the power battery and the battery box body are measured to be U respectivelyPO、UNOFrom the circuit law, one can derive:
when the switch S1 is closed and the switch S2 is opened, a standard bias resistor R is added between the positive pole of the power battery and the battery box bodyC1And measuring the voltages between the positive electrode and the negative electrode of the power battery and the battery box body to be U respectivelyPP、UNPIt is also possible to obtain:
the joint solution of the formula (1) and the formula (2) can be obtained
Also, the insulation resistance can be obtained in the following two cases:
(1) s1, S2 are all opened, S1 is opened, and S2 is closed;
(2) s1 closed, S2 open, S1 open, S2 closed.
The insulation resistance is measured in a manner similar to that described above in the above two cases, and is not described herein again.
In an embodiment of the present invention, the notification module 107 is connected to the first detection module 105, and configured to notify the vehicle to reduce the condensed water in the battery box when the first insulation resistance is less than or equal to a first threshold.
Alternatively, the notification module 107 may generate and send an external insulation fault message to a vehicle (e.g., a fault management device of the vehicle or other device implementing a similar function) when the first insulation resistance is greater than a first threshold. The notification module may generate and send an internal insulation fault message to a vehicle (e.g., a fault management device of the vehicle or other device implementing a similar function) when the first insulation resistance is less than or equal to a first threshold, and generate and send a notification signal to the vehicle after generating and sending the internal insulation fault message to the vehicle, notifying the vehicle to reduce the condensed water in the battery box.
According to the embodiment of the invention, the external insulation fault message is used for informing the vehicle that the external insulation fault of the battery box occurs, wherein the external insulation fault of the battery box means that an electric conduction path exists between the positive electrode or the negative electrode in the battery box and the vehicle chassis, so that the insulation resistance between the positive electrode or the negative electrode in the battery box and the vehicle chassis is reduced. The external insulation fault message may be used to prompt the driver of the vehicle to take appropriate action to address the problem of reduced insulation resistance.
According to the embodiment of the invention, the internal insulation fault message is used for informing the vehicle that the internal insulation fault of the battery box occurs, and the internal insulation fault of the battery box refers to the fact that an electric conduction path (such as an electric conduction path formed by condensed water in the battery box) exists between the positive electrode or the negative electrode in the battery box and the battery box, so that the insulation resistance between the positive electrode or the negative electrode in the battery box and the battery box is reduced. The internal insulation fault message can be used for prompting a driver of the vehicle to take corresponding measures to remove condensed water in the battery box body so as to improve the insulation resistance between the positive electrode or the negative electrode in the battery box body and the battery box body.
In the related art, when an insulation fault is detected during normal operation of a vehicle (contactor closed), a BMS (battery management system) cannot distinguish whether the insulation fault is an internal insulation fault or an external insulation fault because a circuit inside a battery case is electrically connected to a circuit outside the battery case. And in the embodiment of the present invention, it is possible to allow the separation to detect the internal insulation fault and the external insulation fault of the battery case, so that the BMS can distinguish whether the internal insulation fault is the external insulation fault at the time of the detected insulation fault. Specifically, during normal operation of the vehicle, upon detection of an insulation fault, the contactor opens and the circuit inside the battery case is disconnected from the circuit outside the battery case. The internal insulation resistance of the battery case can then be checked separately. If the insulation resistance inside the battery box body is larger than a first threshold value, the insulation fault detected before is the insulation fault outside the battery box body; and if the insulation resistance inside the battery box body is smaller than or equal to the first threshold value, indicating that the insulation fault detected before at least comprises the insulation fault inside the battery box body. In the embodiment of the invention, whether the insulation fault detected after the anode or the cathode of the battery pack is connected with the wiring terminal of the motor of the vehicle is the insulation fault outside the battery box or the insulation fault inside the battery box can be distinguished, so that a user can know the reason of the insulation fault, and further can take counter measures to solve the insulation fault in time, thereby improving the reliability of vehicle operation and ensuring the safety of a vehicle driver and passengers.
Alternatively, in an embodiment of the present invention, if the first detection module 105 detects that the first insulation resistance is less than or equal to the first threshold, i.e., detects an insulation fault inside the battery box, an internal insulation fault message may be generated and sent to a vehicle (e.g., a fault management device of the vehicle or other device that performs a similar function), and thereafter a notification signal may be generated and sent to the vehicle instructing the vehicle to send a control instruction for increasing the temperature inside the battery box to a heating element inside the battery box to reduce the condensed water inside the battery box.
Optionally, in an embodiment of the present invention, in order to avoid that the high-voltage electrical components of the vehicle (such as a traction motor for pushing the vehicle) cannot continue to operate due to the disconnection of the positive electrode or the negative electrode of the battery pack from the connection terminal of the motor of the vehicle, thereby causing the performance of the vehicle to be degraded, and a secondary dangerous situation may occur due to the loss of electric drive, when the insulation resistance between the positive electrode or the negative electrode of the battery pack and the battery box can be greater than the first threshold value, the connection terminal of the motor of the vehicle and the positive electrode or the negative electrode of the battery pack can be reconnected to start the operation of the battery.
Specifically, in the embodiment of the present invention, the first detection module 105 is further configured to detect a second insulation resistance between the positive electrode or the negative electrode of the battery pack and the battery case after reducing the condensed water in the battery case and compare the second insulation resistance with the first threshold; the connection module 103 is further configured to control the positive or negative electrode of the battery pack to be connected to a connection terminal of a motor of the vehicle when the second insulation resistance is greater than the first threshold value.
Optionally, the notification module 107 is further configured to generate and send an internal insulation fault message to the vehicle (e.g., a fault management device of the vehicle or other device implementing a similar function) when the second insulation resistance is less than or equal to the first threshold.
Alternatively, in an embodiment of the present invention, when the first detection module 105 detects that the first insulation resistance is less than or equal to the first threshold value, i.e. detects an insulation fault inside the battery box, an internal insulation fault message may be generated and sent to the vehicle (e.g. a fault management device of the vehicle or other device that performs a similar function), and thereafter a notification signal may be generated and sent to the vehicle, instructing the vehicle to send a control instruction to a Heating Ventilation and Air Conditioning (HVAC) system for lowering the humidity of the gas entering the battery box, or raising the temperature of the gas entering the battery box, to reduce the condensed water inside the battery box.
Optionally, in an embodiment of the present invention, the first detection module 105 may also be further configured to detect a second insulation resistance between the positive electrode or the negative electrode of the battery pack and the battery box after reducing the condensed water in the battery box and compare with the first threshold. The connection module 103 may be further configured to control the positive or negative electrode of the battery pack to be connected to a connection terminal of a motor of the vehicle when it is detected that the second insulation resistance is greater than the first threshold value. The notification module 107 may be further configured to generate and send a fault message of insulation fault inside the battery box to a vehicle (e.g., a fault management device of the vehicle or other device implementing a similar function) when the second insulation resistance is less than or equal to the first threshold.
In a more preferred embodiment, when the first detection module 105 detects that the second insulation resistance is greater than the first threshold, the connection module 103 controls the connection between the positive or negative electrode of the battery pack and the connection terminal of the motor of the vehicle, and the second detection module 101 further detects the insulation resistance between the positive or negative electrode of the battery pack and the chassis of the vehicle and compares the detected insulation resistance with a preset second threshold, and if the detected insulation resistance is less than or equal to the second threshold, generates and transmits an external insulation fault message to the vehicle (e.g., a fault management device of the vehicle or other device that performs a similar function).
The second detecting module 101 may detect the first insulation resistance by the same method as the first detecting module 105, or may detect the third insulation resistance by other methods in the prior art. The second detection module 101 may be configured to be connected to the notification module 107, and send the external insulation fault message to the vehicle through the notification module 107, and the second detection module 101 may also be provided with a separate notification module to send the external insulation fault message to the vehicle.
Alternatively, in an embodiment of the present invention, the first detection module 105 may determine an insulation resistance between a positive electrode or a negative electrode of the battery pack and the battery box before the battery pack operates, compare the insulation resistance with the first threshold, and connect the positive electrode or the negative electrode of the battery pack with a connection terminal of a motor of the vehicle when the insulation resistance is greater than the first threshold; when the first threshold value is less than or equal to the first threshold value, the internal insulation fault message can be sent to the vehicle, the running reliability of the vehicle is improved, and the safety of a vehicle driver and passengers is ensured.
Specifically, in the embodiment of the present invention, the first detection module 105 may be further configured to detect a fourth insulation resistance between the positive or negative electrode of the battery pack and the battery case and compare with the first threshold before the positive or negative electrode of the battery pack is connected with the connection terminal of the motor of the vehicle; the connection module 103 may be further configured to connect the positive or negative electrode of the battery pack with a connection terminal of a motor of the vehicle when the fourth insulation resistance is greater than the first threshold value; the notification module 107 may be further configured to send an internal insulation fault message to the vehicle when the fourth insulation resistance is less than or equal to the first threshold.
In the above embodiments, the manner of measuring the insulation resistance value may be performed with reference to the scheme described with respect to fig. 3, and is not described herein again.
According to a second aspect of the present invention, there is provided a hybrid vehicle or an electric vehicle including: a battery pack and a battery box for housing the battery pack, and a battery management system as described above. Optionally, the hybrid electric vehicle or the electric vehicle may further include a fault management device of the vehicle or a device implementing a similar function to receive a fault message sent by the battery management system. According to the embodiment of the invention, during normal operation of the vehicle, once an insulation fault is detected, the circuit inside the battery case can be disconnected from the circuit outside the battery case. The internal insulation resistance of the battery case was then checked. If the insulation resistance inside the battery case is less than or equal to the first threshold value, it can be determined that there is an insulation failure at least inside the battery case. When the insulation fault in the battery box body is detected during the normal running of the vehicle, the treatment of reducing the condensed water in the battery box body can be carried out, so that the insulation resistance between the anode or the cathode of the battery pack and the battery box body is improved, the insulation fault in the battery box body is repaired, and the running reliability of the vehicle is improved. In addition, if the battery case internal insulation resistance is greater than the first threshold value, it may be determined that the insulation fault detected before is a battery case external insulation fault. According to the embodiment of the invention, whether the insulation fault detected in the normal running period of the vehicle is the insulation fault outside the battery box body or the insulation fault inside the battery box body can be distinguished, so that a vehicle driver can know the reason of the insulation fault, and can take corresponding measures to solve the insulation fault in time, the running reliability of the vehicle is improved, and the safety of the vehicle driver and passengers is ensured. Further, after the insulation fault inside the battery box is repaired, the insulation resistance between the positive electrode or the negative electrode of the battery pack and the battery box can be detected again and compared with the first threshold, and when the insulation resistance between the positive electrode or the negative electrode of the battery pack and the battery box is greater than the first threshold, an instruction for receiving the connection between the circuit inside the battery box and the circuit outside the battery box can be triggered, so that the circuit inside the battery box is connected with the circuit outside the battery box, the restart operation of the battery pack is realized, and the high-voltage electrical components of the vehicle (such as a traction motor of the vehicle) can continue to operate. To avoid degradation of vehicle performance and to avoid the occurrence of a secondary hazard situation that may result from loss of electric drive.
According to a third aspect of the present invention, corresponding to the battery management system 100 according to the embodiment of the present invention as described above, the present invention also provides a battery management method 400.
As shown in fig. 4, which is one of flowcharts of a battery management method for a vehicle including a battery pack and a battery box for accommodating the battery pack according to an embodiment of the present invention.
Fig. 2 schematically shows a circuit diagram of a power part in an electric or hybrid vehicle, wherein the current output by the battery pack 203 in the battery box 201 can be converted by the inverter 207 and then transmitted to the motor 209. Specifically, when the contactor 205 is in a closed state, the positive or negative electrode of the battery pack 203 inside the battery case 201 may be connected to the connection terminal of the motor 209 outside the battery case 201 through the contactor 205.
According to an embodiment of the invention, in the method 400, a step S401 is first performed in which the positive or negative electrode of the battery pack (e.g., the battery pack 203 in the battery box 201 shown in fig. 2) is controlled to be disconnected from the connection terminal of the motor of the vehicle (e.g., the motor 209 shown in fig. 2) upon receiving the insulation failure signal.
Next, step S403 is performed in which, after the positive or negative electrode of the battery pack is disconnected from the connection terminal of the motor of the vehicle, a first insulation resistance between the positive or negative electrode of the battery pack and the battery case is detected and compared with a first threshold value that is preset or not.
According to the embodiment of the present invention, it is possible to control the positive electrode or the negative electrode of the battery pack to be disconnected from the connection terminal of the motor of the vehicle upon receiving the insulation failure signal. Optionally, the method further includes step S402 (not shown in fig. 4), in which after the positive electrode or the negative electrode of the battery pack is connected to the connection terminal of the motor of the vehicle, a third insulation resistance between the positive electrode or the negative electrode of the battery pack and the vehicle chassis is detected and compared with a preset second threshold value, and when the third insulation resistance is less than or equal to the second threshold value, an insulation fault signal is transmitted.
In the embodiment of the present invention, the values of the preset first threshold and the preset second threshold may be set as follows: international standards for electric vehicles stipulate: the result of dividing the insulation resistance value by the nominal voltage U of the direct current system of the electric automobile is larger than 100 omega/V, and the safety requirement is met. Therefore, in an embodiment of the present invention, the preset first threshold and the preset second threshold may be set according to the international standard of the electric vehicle, that is, the preset first threshold and the preset second threshold are set according to the international standard of the electric vehicle: (preset threshold value/nominal voltage U of the direct current system of the electric automobile) > 100 omega/V. It should be understood that, in the embodiment of the present invention, specific values of the preset first threshold and the preset second threshold are not limited.
In the embodiment of the present invention, the insulation resistance measurement circuit shown in fig. 3 may be used to measure a first insulation resistance value between the positive electrode or the negative electrode of the battery pack and the battery case, or the insulation resistance measurement circuit shown in fig. 3 may be used to measure a third insulation resistance value between the positive electrode or the negative electrode of the battery pack and the vehicle chassis. It is of course understood that the specific manner of measuring the first and third insulation resistance values of the battery pack is not limited in the embodiments of the present invention.
Referring to fig. 3, assuming that a dc system voltage (i.e., a power battery voltage) of an Electric Vehicle (Electric Vehicle) or a hybrid Electric Vehicle is U, insulation resistances between a positive electrode and a negative electrode of a power battery to be measured and a battery box or a Vehicle chassis are R, respectivelyP、RNThe voltages between the positive electrode and the negative electrode and the battery box body or the vehicle chassis are respectively UP、UNThen, the equivalent model of the dc system to be measured is shown in the dashed box of fig. 3.
The measurement principle is shown in FIG. 3, wherein RC1、RC2Is a standard resistor of known resistance for measurement. The working principle is as follows:
when the switches S1 and S2 are all turned off, the voltages between the positive pole and the negative pole of the power battery and the battery box body are measured to be U respectivelyPO、UNOFrom the circuit law, one can derive:
when the switch S1 is closed and the switch S2 is opened, a standard bias resistor R is added between the positive pole of the power battery and the battery box bodyC1Measuring movementThe voltages between the positive pole and the negative pole of the force battery and the battery box body are respectively UPP、UNPIt is also possible to obtain:
the joint solution of the formula (1) and the formula (2) can be obtained
Also, the insulation resistance can be obtained in the following two cases:
(1) s1, S2 are all opened, S1 is opened, and S2 is closed;
(2) s1 closed, S2 open, S1 open, S2 closed.
The insulation resistance is measured in a manner similar to that described above in the above two cases, and is not described herein again.
According to an embodiment of the present invention, after the positive or negative electrode of the battery pack is disconnected from the connection terminal of the motor of the vehicle, a first insulation resistance between the positive or negative electrode of the battery pack and the battery case is detected and compared with a preset first threshold value.
In an embodiment of the present invention, in step S405, when the first insulation resistance is less than or equal to a first threshold, the vehicle is notified to reduce the condensed water in the battery case. Alternatively, an internal insulation fault message may be generated and transmitted to a vehicle (e.g., a fault management device of the vehicle or other device implementing a similar function) when the first insulation resistance is less than or equal to the first threshold value, and a notification signal may be generated and transmitted to the vehicle after the internal insulation fault message is generated and transmitted to the vehicle, notifying the vehicle to reduce the condensed water in the battery box. Additionally, an external insulation fault message may be generated and sent to the vehicle (e.g., a fault management device of the vehicle or other device implementing a similar function) when the first insulation resistance is greater than the first threshold.
According to the embodiment of the invention, the external insulation fault message is used for informing the vehicle that the external insulation fault of the battery box occurs, and the external insulation fault of the battery box means that an electric conduction path exists between the positive electrode or the negative electrode in the battery box and the vehicle chassis, so that the insulation resistance between the positive electrode or the negative electrode in the battery box and the vehicle chassis is reduced. The external insulation fault message may be used to prompt the driver of the vehicle to take appropriate action to address the problem of reduced insulation resistance.
According to the embodiment of the invention, the internal insulation fault message is used for informing the vehicle that the internal insulation fault of the battery box occurs, and the internal insulation fault of the battery box refers to the fact that an electric conduction path (such as an electric conduction path formed by condensed water in the battery box) exists between the positive electrode or the negative electrode in the battery box and the battery box, so that the insulation resistance between the positive electrode or the negative electrode in the battery box and the battery box is reduced. The internal insulation fault message can be used for prompting a driver of the vehicle to take corresponding measures to remove condensed water in the battery box body so as to improve the insulation resistance between the positive electrode or the negative electrode in the battery box body and the battery box body.
In the related art, when an insulation fault is detected during normal operation of a vehicle (contactor closed), a BMS (battery management system) cannot distinguish whether the insulation fault is an internal insulation fault or an external insulation fault because a circuit inside a battery case is electrically connected to a circuit outside the battery case.
In the embodiment of the present invention, however, it is possible to separately detect the internal insulation fault and the external insulation fault of the battery case, so that the BMS can distinguish whether the internal insulation fault or the external insulation fault is the detected insulation fault. Specifically, during normal operation of the vehicle, upon detection of an insulation fault, the contactor opens and the circuit inside the battery case is disconnected from the circuit outside the battery case. The internal insulation resistance of the battery case can then be checked separately. If the insulation resistance inside the battery box body is larger than a first threshold value, the insulation fault detected before is the insulation fault outside the battery box body; and if the insulation resistance inside the battery box body is smaller than or equal to the first threshold value, indicating that the insulation fault detected before at least comprises the insulation fault inside the battery box body. In the embodiment of the invention, the insulation fault detected after the anode or the cathode of the battery pack is connected with the wiring terminal of the motor of the vehicle can be distinguished to be the insulation fault outside the battery box body or the insulation fault inside the battery box body, so that a user can know the reason of the insulation fault, further can take counter measures to solve the insulation fault in time, the reliability of the vehicle operation is improved, and the safety of a vehicle driver and passengers is ensured.
Alternatively, in an embodiment of the present invention, if it is detected that the first insulation resistance is less than or equal to the first threshold value, i.e., an internal insulation fault of the battery box is detected, an internal insulation fault message may be generated and sent to a vehicle (e.g., a fault management device of the vehicle or other device that performs a similar function), and thereafter a notification signal may be generated and sent to the vehicle, instructing the vehicle to send a control instruction for increasing the temperature within the battery box to the heating element within the battery box, so as to reduce the condensed water within the battery box.
Optionally, in an embodiment of the present invention, in order to avoid that the high-voltage electrical components of the vehicle (such as a traction motor for pushing the vehicle) cannot continue to operate due to the disconnection of the positive electrode or the negative electrode of the battery pack from the connection terminal of the motor of the vehicle, thereby causing the performance of the vehicle to be degraded, and a secondary dangerous situation may occur due to the loss of electric drive, when the insulation resistance between the positive electrode or the negative electrode of the battery pack and the battery box can be greater than the first threshold value, the connection terminal of the motor of the vehicle and the positive electrode or the negative electrode of the battery pack can be reconnected to start the operation of the battery.
Specifically, in the embodiment of the present invention, after the condensed water in the battery box is reduced, the second insulation resistance between the positive electrode or the negative electrode of the battery pack and the battery box is detected and compared with the preset first threshold value in step S407. In step S409, when the second insulation resistance is greater than the first threshold value, the positive electrode or the negative electrode of the battery pack is controlled to be connected to a connection terminal of the motor of the vehicle. Optionally, in an optional step, an internal insulation fault message is generated and sent to the vehicle (e.g. a fault management device of the vehicle or other device implementing a similar function) when the second insulation resistance is less than or equal to the first threshold value.
Alternatively, in an embodiment of the invention, when the first insulation resistance is less than or equal to the first threshold, i.e. a battery compartment internal insulation fault is detected, an internal insulation fault message may be generated and sent to the vehicle (e.g. a fault management device of the vehicle or other device performing a similar function), and thereafter a notification signal may be generated and sent to the vehicle, informing the vehicle to send a Heating Ventilation and Air Conditioning (HVAC) control command to reduce the humidity of the gas entering the battery compartment, or to increase the temperature of the gas entering the battery compartment, in order to reduce the condensation water inside the battery compartment.
Optionally, in an embodiment of the present invention, a second insulation resistance between the positive electrode or the negative electrode of the battery pack and the battery case is detected after the condensed water in the battery case is reduced and compared with a preset first threshold value. When the second insulation resistance is greater than the first threshold value, the positive electrode or the negative electrode of the battery pack may be controlled to be connected to a connection terminal of a motor of the vehicle. Alternatively, in an optional step, when the second insulation resistance is less than or equal to the first threshold, a fault message of insulation fault inside the battery box may be generated and sent to a vehicle (e.g., a fault management device of the vehicle or other device implementing a similar function).
In a more preferred embodiment, when the second insulation resistance is greater than the first threshold value, the positive or negative pole of the battery pack may be controlled to be connected to a terminal of the electric motor of the vehicle, the insulation resistance between the positive or negative pole of the battery pack and the vehicle chassis is further detected and compared with a preset second threshold value, and if the insulation resistance is less than or equal to the second threshold value, an external insulation fault message is generated and sent to the vehicle (e.g., a fault management device of the vehicle or other device implementing a similar function).
Optionally, in the embodiment of the present invention, before the battery pack operates, it may be determined whether an insulation resistance between the positive electrode or the negative electrode of the battery pack and the battery case is greater than a first threshold, and when it is greater than the first threshold, the positive electrode or the negative electrode of the battery pack is connected to a connection terminal of a motor of the vehicle; when the voltage is less than or equal to the first threshold value, an internal insulation fault message can be sent to the vehicle, the running reliability of the vehicle is improved, and the safety of a vehicle driver and passengers is ensured.
Specifically, in the embodiment of the invention, the fourth insulation resistance between the positive electrode or the negative electrode of the battery pack and the battery case may be detected and compared with the preset first threshold before the positive electrode or the negative electrode of the battery pack is connected to the connection terminal of the motor of the vehicle. Connecting the positive electrode or the negative electrode of the battery pack with a connection terminal of a motor of the vehicle when the fourth insulation resistance is greater than the first threshold value; transmitting an internal insulation fault message to the vehicle when the fourth insulation resistance is less than or equal to a first threshold value.
In the above embodiments, the manner of measuring the insulation resistance value may be performed with reference to the scheme described with respect to fig. 3, and is not described herein again.
Fig. 5 schematically illustrates a second flowchart of a battery tube for a vehicle according to an embodiment of the present invention.
Step S501: receiving a battery operation request, and performing BMS initialization;
step S503: executing insulation resistance detection in the battery box body;
in an embodiment of the present invention, an insulation resistance measurement circuit as shown in fig. 3 may be used to measure the insulation resistance value between the positive or negative electrode of the battery pack and the battery case. It is of course understood that the specific manner of measuring the insulation resistance value between the positive or negative electrode of the battery pack and the vehicle case is not limited in the embodiments of the present invention.
Step S505: judging whether the insulation resistance inside the battery box body meets the requirement (namely whether the insulation resistance is larger than a first threshold value), if so, entering a step S509; otherwise, go to step S507;
step S507: reporting an insulation fault inside the battery box body to the vehicle;
step S509: receiving a contactor closing request, and then entering step S511;
step S511: closing the contactor, and then proceeding to step S513;
step S513: executing insulation detection between the positive electrode and the negative electrode of the power battery and the chassis, and also being called as insulation resistance of a detection system;
step S515: judging whether the insulation resistance between the positive electrode and the negative electrode of the power battery and the chassis meets the requirement (namely whether the insulation resistance is larger than a second threshold), if so, normally operating, and returning to the step S513; otherwise, entering step S517;
step S517: reporting that the insulation resistance between the anode and the cathode of the power battery and the chassis does not meet the requirement, and then entering the step S519;
step S519: and opening the contactor, namely disconnecting the connection between the internal circuit of the battery box body and the external circuit of the battery box body.
Step S521: executing insulation resistance detection in the battery box body;
in an embodiment of the present invention, an insulation resistance measurement circuit as shown in fig. 3 may be used to measure the insulation resistance value between the positive or negative electrode of the battery pack and the battery case. It is of course understood that the specific manner of measuring the insulation resistance value between the positive or negative electrode of the battery pack and the vehicle case is not limited in the embodiments of the present invention.
Step S523: judging whether the insulation resistance in the battery box body meets the requirement, if so, entering step S525; otherwise, go to step S527;
step S525: reporting an insulation fault outside the battery box body;
step S527: reporting an insulation fault inside the battery box body, and then entering step S529;
step S529: removing condensed water in the battery box, and then entering step S531;
step S531: and executing the detection of the insulation resistance in the battery box body.
In an embodiment of the present invention, an insulation resistance measurement circuit as shown in fig. 3 may be used to measure the insulation resistance value between the positive or negative electrode of the battery pack and the battery case. It is of course understood that the specific manner of measuring the insulation resistance value between the positive or negative electrode of the battery pack and the vehicle case is not limited in the embodiments of the present invention.
Step S533: judging whether the insulation resistance in the battery box body meets the requirement, if so, executing a step S537; otherwise, go to step S535;
step S535: and reporting that the insulation fault in the battery box body is cleared, and then returning to the step S509 to restart the battery.
Step S537: the vehicle is reported of the battery case internal insulation failure, and then returns to step S531.
Since the above-described method embodiments correspond to the above-described apparatus embodiments, the method embodiments will not be described in detail.
In this specification, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some embodiments, well-known methods, structures and techniques have not been shown in detail in order not to obscure the understanding of the principles of this description.
Those skilled in the art will appreciate that the modules in the devices in the various embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. Several modules of embodiments may be combined into one module or unit or assembly, and they may be further divided into multiple sub-modules or sub-units or sub-assemblies. All steps of any method or all modules of any apparatus disclosed in this specification may be combined in any combination, except where features or processes are mutually exclusive. Each feature disclosed in this specification may be replaced by an alternative feature serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Various apparatus embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functionality of some or all of the modules in an apparatus according to embodiments of the present invention. The present invention may also be embodied as apparatus programs (e.g., computer programs and computer program products) for performing the methods described herein.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, the ordering of features does not imply any particular order for the features, and in particular the order of steps in a method claim does not imply that the steps must be performed in this order. Rather, the steps may be performed in any suitable order. Also, the order in which the blocks in the apparatus claims perform processing should not be limited by the order of the blocks in the claims, but the processing may be performed in any suitable order. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The term "comprising" or "comprises" does not exclude the presence of modules or steps not listed in a claim. The terms "a" or "an" preceding a module or step do not exclude the presence of a plurality of such modules or steps. The invention may be implemented by means of hardware comprising several distinct modules, and by means of a suitably programmed computer or processor. In the device claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the terms first, second, third, etc. do not denote any order, and such terms may be interpreted as names. The terms "connected," "coupled," and the like as used in this specification are defined as being operably connected in any desired form, e.g., mechanically, electronically, digitally, analog, directly, indirectly, through software, through hardware, and the like.

Claims (16)

1. A battery management system for a vehicle including a battery pack and a battery case for housing the battery pack, the system comprising: the device comprises a connection module, a first detection module and a notification module; wherein,
the connection module is connected with the first detection module and is configured to control the positive pole or the negative pole of the battery pack to be disconnected from a wiring terminal of a motor of a vehicle when the insulation fault signal is received;
the first detection module is configured to detect a first insulation resistance between the positive electrode or the negative electrode of the battery pack and the battery box and compare the first insulation resistance with a preset first threshold value after the connection module controls the positive electrode or the negative electrode of the battery pack to be disconnected from a connection terminal of a motor of a vehicle;
the notification module is connected with the first detection module and is configured to notify a vehicle to reduce condensed water in the battery box when the first insulation resistance is smaller than or equal to a first threshold value;
the first detection module is further configured to detect a second insulation resistance between a positive electrode or a negative electrode of a battery pack and the battery case and compare with a first threshold value after reducing condensed water in the battery case;
the connection module is further configured to control connection of a positive electrode or a negative electrode of the battery pack with a connection terminal of a motor of a vehicle when the second insulation resistance is greater than the first threshold value.
2. The system of claim 1, wherein:
the notification module is further configured to generate and send an external insulation fault message to a vehicle when the first insulation resistance is greater than a first threshold; an internal insulation fault message is generated and transmitted to the vehicle when the first insulation resistance is less than or equal to a first threshold value, and a notification signal is generated and transmitted to the vehicle after the internal insulation fault message is generated and transmitted to the vehicle, notifying the vehicle to reduce the condensed water in the battery box.
3. The system of claim 1, wherein:
the notification module is further configured to generate and transmit an interior insulation fault message to a vehicle when the second insulation resistance is less than or equal to a first threshold.
4. The system of claim 1, wherein:
the notification module is configured to notify a vehicle to send a control instruction for increasing a temperature within the battery box to a heating element within the battery box to reduce condensed water within the battery box.
5. The system of claim 1, wherein:
the notification module is configured to notify a vehicle to send a control instruction for reducing humidity of gas entering the battery box or increasing temperature of gas entering the battery box to a heating ventilation and air conditioning control system to reduce condensed water in the battery box.
6. The system of claim 1, wherein:
the system further includes a second detection module connected to the connection module, configured to detect a third insulation resistance between the positive or negative electrode of the battery pack and the vehicle chassis after the positive or negative electrode of the battery pack is connected to the connection terminal of the motor of the vehicle and compare the third insulation resistance with a preset second threshold value, and send an insulation fault signal to the connection module when the third insulation resistance is less than or equal to the second threshold value.
7. The system of claim 1, wherein:
the first detection module is further configured to detect a fourth insulation resistance between the positive or negative electrode of the battery pack and the battery case and compare with the first threshold before the positive or negative electrode of the battery pack is connected with a connection terminal of a motor of a vehicle;
the connection module is further configured to connect the positive or negative electrode of the battery pack with a connection terminal of a motor of a vehicle when the fourth insulation resistance is greater than a first threshold value;
the notification module is further configured to send an interior insulation fault message to a vehicle when the fourth insulation resistance is less than or equal to a first threshold.
8. A gasoline-electric hybrid vehicle or an electric vehicle, comprising: a battery pack and a battery case for housing the battery pack, and a battery management system as claimed in any one of claims 1 to 7.
9. The hybrid vehicle or electric vehicle according to claim 8, characterized in that: the vehicle further includes a fault management device to receive a fault message sent by the battery management system.
10. A battery management method for a vehicle including a battery pack and a battery box for housing the battery pack, characterized by comprising:
controlling the positive pole or the negative pole of the battery pack to be disconnected from a connection terminal of a motor of the vehicle when the insulation fault signal is received;
detecting a first insulation resistance between the positive or negative electrode of the battery pack and the battery case and comparing the first insulation resistance with a first threshold value after the positive or negative electrode of the battery pack is disconnected from a connection terminal of a motor of a vehicle;
when the first insulation resistance is smaller than or equal to a first threshold value, informing a vehicle to reduce condensed water in the battery box body;
detecting a second insulation resistance between a positive electrode or a negative electrode of a battery pack and the battery case and comparing with the first threshold value after reducing the condensed water in the battery case;
and when the second insulation resistance is larger than the first threshold value, controlling the positive pole or the negative pole of the battery pack to be connected with a connecting terminal of a motor of the vehicle.
11. The method of claim 10, wherein the method further comprises:
generating and sending an external insulation fault message to the vehicle when the first insulation resistance is greater than a first threshold; an internal insulation fault message is generated and transmitted to the vehicle when the first insulation resistance is less than or equal to a first threshold value, and a notification signal is generated and transmitted to the vehicle after the internal insulation fault message is generated and transmitted to the vehicle, notifying the vehicle to reduce the condensed water in the battery box.
12. The method of claim 10, wherein the method further comprises:
generating and transmitting an internal insulation fault message to the vehicle when the second insulation resistance is less than or equal to a first threshold value.
13. The method of claim 10, wherein the step of notifying the vehicle to reduce condensed water within the battery compartment comprises:
and informing a vehicle to send a control instruction for increasing the temperature in the battery box to a heating element in the battery box so as to reduce the condensed water in the battery box.
14. The method of claim 10, wherein the step of notifying the vehicle to reduce condensed water within the battery compartment comprises:
and informing the vehicle to send a control instruction for reducing the humidity of the gas entering the battery box body or improving the temperature of the gas entering the battery box body to a heat supply ventilation and air conditioning control system so as to reduce the condensed water in the battery box body.
15. The method of claim 10, further comprising:
after the step of connecting the positive or negative electrode of the battery pack to the connection terminal of the motor of the vehicle, a third insulation resistance between the positive or negative electrode of the battery pack and the vehicle chassis is detected and compared with a second threshold value, and an insulation failure signal is transmitted when the third insulation resistance is less than or equal to the second threshold value.
16. The method of claim 10, further comprising:
detecting a fourth insulation resistance between the positive or negative electrode of the battery pack and the battery case and comparing with the first threshold value, before the step of connecting the positive or negative electrode of the battery pack and the connection terminal of the motor of the vehicle;
connecting the positive electrode or the negative electrode of the battery pack with a connection terminal of a motor of the vehicle when the fourth insulation resistance is greater than a first threshold value; generating and transmitting an internal insulation fault message to the vehicle when the fourth insulation resistance is less than or equal to the first threshold value.
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