CN104192018B

CN104192018B - Battery management system and method for vehicle and vehicle

Info

Publication number: CN104192018B
Application number: CN201410435952.6A
Authority: CN
Inventors: 狄彼德; 彦斯·贝肯; 罗伯特·丁力
Original assignee: Ooros Automotive Co Ltd
Current assignee: Ooros Automotive Co Ltd
Priority date: 2014-08-29
Filing date: 2014-08-29
Publication date: 2017-05-03
Anticipated expiration: 2034-08-29
Also published as: CN104192018A

Abstract

The invention discloses a battery management system and method for a vehicle and the vehicle. The system comprises a system insulation fault detection module, a connection control module, an internal insulation fault detection module and a notification module. The system insulation fault detection module is used for detecting whether a first insulation resistor between the positive electrode or the negative electrode of a battery pack and a vehicle chassis meets a first preset condition after the positive electrode or the negative electrode of the battery pack in a battery compartment is connected with a wiring terminal of a motor of the vehicle. The connection control module is used for controlling the positive electrode or the negative electrode of the battery pack to be disconnected from the wiring terminal of the motor of the vehicle if the first insulation resistor does not meet the first preset condition. The internal insulation fault detection module is used for detecting whether a second insulation resistor between the positive electrode or the negative electrode of the battery pack and the battery compartment meets a second preset condition. The notification module is used for generating an external insulation fault message and sending the external insulation fault message to the vehicle if the second insulation resistor meets the second preset condition, and generating an internal insulation fault message and sending the internal insulation fault message to the vehicle if the second insulation resistor does not meets the second preset condition.

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 between the positive pole or the negative pole of the high-voltage system and the vehicle chassis, and users can be in a dangerous condition only when the two insulation systems 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, safety measures are taken, such as directly removing the high voltage potential, or the control device or BATTERY management system (BATTERY MANAGEMENT SYSTEM, BMS) shutting down the BATTERY 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. Conventional insulation fault detection has difficulty distinguishing the cause of an insulation fault, when the insulation fault occurs, i.e., the high voltage power supply is removed or switched off, the high voltage electrical components (such as the traction motors that propel the vehicle) cannot be restarted, which can result in immediate performance degradation and possibly even a secondary hazard situation due to 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, the system comprising: the system comprises a system insulation fault detection module, a connection control module, an internal insulation fault detection module and a notification module. The system insulation fault detection module is used for detecting whether a first insulation resistance between the positive pole or the negative pole of the battery pack in the battery box and a vehicle chassis meets a first preset condition after the positive pole or the negative pole of the battery pack in the battery box is connected with a wiring terminal of a motor of a vehicle. The connection control module is connected with the system insulation fault detection module and the internal insulation fault detection module and used for controlling the connection/disconnection of the positive pole or the negative pole of the battery pack in the battery box and the wiring terminal of the motor of the vehicle, and the connection control module controls the disconnection of the positive pole or the negative pole of the battery pack in the battery box and the wiring terminal of the motor of the vehicle when the first insulation resistance does not meet a first preset condition. The internal insulation fault detection module is used for detecting whether a second insulation resistance between the positive pole or the negative pole of the battery pack in the battery box and the battery box meets a second preset condition or not after the positive pole or the negative pole of the battery pack in the battery box is disconnected with a wiring terminal of a motor of a vehicle. The notification module is connected with the internal insulation fault detection module and used for generating and sending an external insulation fault message to the vehicle when the second insulation resistor meets a second preset condition; and when the second insulation resistance does not meet a second preset condition, generating and sending an internal insulation fault message to the vehicle.

Optionally, the notification module is further configured to notify the vehicle to send a control instruction for increasing the temperature in the battery box to the heating element in the battery box after generating and sending the internal insulation fault message to the vehicle, so as to reduce the condensed water in the battery box.

Optionally, the internal insulation detection module is further configured to detect whether a third insulation resistance between the positive electrode or the negative electrode of the battery pack in the battery box and the battery box meets a second preset condition after the condensed water in the battery box is reduced.

The connection control module is configured to control connection between a positive electrode or a negative electrode of a battery pack in the battery box and a wiring terminal of a motor of the vehicle when the third insulation resistance meets a second preset condition; the notification module is further configured to generate and send an internal insulation fault message to a fault management device of the vehicle when the third insulation resistance does not satisfy a second preset condition.

Optionally, the notification module is further configured to, after generating and sending a fault message of insulation fault inside the battery box to the vehicle, 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 a heating, ventilation and air conditioning control system, so as to reduce condensed water inside the battery box.

Optionally, the internal insulation detection module is further configured to detect whether a third insulation resistance between a positive electrode or a negative electrode of a battery pack in the battery box and the battery box satisfies a second preset condition after reducing the condensed water in the battery box.

The connection control module is further configured to control connection between a positive electrode or a negative electrode of a battery pack in the battery box and a connection terminal of a motor of the vehicle when the third insulation resistance is detected to meet a second preset condition; the notification module is further configured to generate and transmit a fault message of insulation fault inside the battery box to a fault management device of a vehicle when the third insulation resistance does not satisfy a second preset condition.

Optionally, the internal insulation fault detection module is further configured to detect whether a fourth insulation resistance between the positive electrode or the negative electrode of the battery pack in the battery box and the battery box meets a second preset condition before the positive electrode or the negative electrode of the battery pack in the battery box is connected with a connection terminal of a motor of the vehicle.

The connection control module is further configured to connect the positive electrode or the negative electrode of the battery pack in the battery box with a connection terminal of a motor of the vehicle when the fourth insulation resistance meets a second preset condition; the notification module is further configured to send an internal insulation fault message to a vehicle when the fourth insulation resistance does not satisfy a second preset condition.

According to another aspect of the present invention, there is also provided a hybrid vehicle or an electric vehicle including: the battery management system comprises the fault management device of the vehicle and the battery management system, wherein the fault management device of the vehicle is used for receiving fault messages sent by the battery management system.

According to yet another aspect of the present invention, there is also provided a battery management method for a vehicle. The vehicle includes a battery pack and a battery box for accommodating the battery pack, the method includes: and a connecting terminal for connecting the positive electrode or the negative electrode of the battery pack in the battery box body with a motor of a vehicle. After the positive pole or the negative pole of the battery pack in the battery box is connected with a wiring terminal of a motor of a vehicle, whether a first insulation resistance between the positive pole or the negative pole of the battery pack in the battery box and a chassis of the vehicle meets a first preset condition is detected. And when the first insulation resistor does not meet a first preset condition, disconnecting the connection of the anode or the cathode of the battery pack in the battery box and a wiring terminal of a motor of the vehicle. After the positive pole or the negative pole of the battery pack in the battery box is disconnected with a wiring terminal of a motor of a vehicle, whether a second insulation resistance between the positive pole or the negative pole of the battery pack in the battery box and the battery box meets a second preset condition is detected. When the second insulation resistance meets a second preset condition, generating and sending a fault message of the insulation fault outside the battery box body to a vehicle; and when the second insulation resistance does not meet a second preset condition, generating and sending a fault message of the insulation fault in the battery box body to the vehicle.

Optionally, the method further comprises: after generating and transmitting the battery box internal insulation fault message to the vehicle, informing the vehicle to transmit 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, the method further comprises:

after the battery box internal insulation fault message is generated and sent to the vehicle, the vehicle is informed to send a control instruction for reducing the humidity of the gas entering the battery box or increasing the temperature of the gas entering the battery box to a heating, ventilation and air conditioning control system so as to reduce the condensed water in the battery box.

Optionally, the method further comprises:

and after the condensed water in the battery box is reduced, detecting whether a third insulation resistance between the positive electrode or the negative electrode of the battery pack in the battery box and the battery box meets a second preset condition.

When the third insulation resistance meets a second preset condition, controlling the connection between the positive electrode or the negative electrode of the battery pack in the battery box and a wiring terminal of a motor of the vehicle; and when the third insulation resistance does not meet a second preset condition, generating and sending a fault message of the insulation fault in the battery box body to fault management equipment of the vehicle.

Optionally, the method further comprises:

before the positive pole or the negative pole of the battery pack in the battery box body is connected with a wiring terminal of a motor of a vehicle, whether a fourth insulation resistance between the positive pole or the negative pole of the battery pack in the battery box body and the battery box body meets a second preset condition is detected.

When the fourth insulation resistance meets a second preset condition, connecting the positive electrode or the negative electrode of the battery pack in the battery box body with a wiring terminal of a motor of the vehicle; and when the fourth insulation resistance does not meet a second preset condition, generating and sending a fault message of the insulation fault in the battery box body to the vehicle.

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 internal insulation resistance of the battery box body meets the requirement, the insulation fault detected before can be judged to be the external insulation fault of the battery box body; if the insulation resistance inside the battery case does not meet the requirement, it can be determined that there is an insulation failure at least inside the battery case. 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, 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.

Furthermore, after the insulation fault in the battery box is repaired, whether the insulation resistance between the anode or the cathode of the battery pack and the battery box meets the requirement can be detected again, and when the insulation resistance between the anode or the cathode of the battery pack and the battery box meets the requirement, an instruction for receiving the connection between the circuit in the battery box and the circuit outside the battery box can be triggered, so that the circuit in the battery box is connected with the circuit outside the battery box, the restarting operation of the battery pack is realized, and the high-voltage electric elements (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 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 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 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.

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 system insulation fault detection module 101, a connection control module 103, an internal insulation fault 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 realize the functions 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.

In the embodiment of the present invention, the system insulation fault detection module 101 is configured to detect whether a first insulation resistance between a positive electrode or a negative electrode of the battery pack in the battery box and a vehicle chassis satisfies a first preset condition after the positive electrode or the negative electrode of the battery pack in the battery box is connected to a terminal of a motor of the vehicle.

As shown in fig. 2, it is a schematic circuit diagram of an electric or hybrid vehicle, in which 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 electric motor 209. Specifically, when the contactor 205 is in a closed state, the positive electrode or the 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.

Optionally, in an embodiment of the present invention, whether the first insulation resistance satisfies the first preset condition may refer to that the first insulation resistance should be greater than a preset first insulation resistance threshold. In the embodiment of the present invention, the value of the preset first insulation resistance 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 insulation resistance threshold may be set according to the international standard of the electric vehicle, that is: (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, a specific value of the preset first insulation resistance threshold is not limited.

In an embodiment of the present invention, the system insulation fault detection module 101 may measure a first insulation resistance value between the positive electrode or the negative electrode of the battery pack in the battery box 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 system insulation fault detection module 101 measures the first insulation resistance value between the positive electrode or the negative electrode of the battery pack in the battery box and the vehicle chassis 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 Vehicle chassis are R, respectively_P、R_NThe voltages between the positive pole and the negative pole and the vehicle chassis are respectively U_P、U_NThen, 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 R_C1、R_C2Is 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 respectively_PO、U_NOFrom the circuit law, one can derive:

when the switch S1 is closed, S2When the power battery is disconnected, a standard bias resistor R is added between the positive electrode of the power battery and the battery box body_C1And measuring the voltages between the positive electrode and the negative electrode of the power battery and the battery box body to be U respectively_PP、U_NPIt 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 both cases, and will not be described here.

In the embodiment of the present invention, the connection control module 103 is connected to the system insulation fault detection module 101 and the internal insulation fault detection module 105, and is configured to control connection/disconnection between a positive electrode or a negative electrode of the battery pack in the battery box and a connection terminal of a motor of the vehicle; the connection control module 103 controls the positive electrode or the negative electrode of the battery pack in the battery box to be disconnected from the connection terminal of the motor of the vehicle when the first insulation resistance does not satisfy the first preset condition.

In an embodiment of the present invention, the internal insulation fault detection module 105 is configured to detect whether a second insulation resistance between the positive electrode or the negative electrode of the battery pack in the battery box and the battery box satisfies a second preset condition after the positive electrode or the negative electrode of the battery pack in the battery box is disconnected from a connection terminal of a motor of the vehicle.

Optionally, in the embodiment of the present invention, whether the second insulation resistance satisfies the second preset condition may refer to that the second insulation resistance should be greater than a preset second insulation resistance threshold. In the embodiment of the present invention, the value of the preset second insulation resistance 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 second insulation resistance threshold value may be set according to the international standard of the electric vehicle, that is, the preset second insulation resistance threshold value is 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, a specific value of the preset second insulation resistance threshold is not limited.

In an embodiment of the present invention, the internal insulation fault detection module 105 may measure a second insulation resistance value between the positive electrode or the negative electrode of the battery pack in the battery box and the battery box using an insulation resistance measurement circuit as shown in fig. 3. It is of course understood that the specific manner in which the internal insulation fault detection module 105 measures the second insulation resistance value between the positive electrode or the negative electrode of the battery pack in the battery box and the battery box is not limited in the embodiments of the present invention.

In an embodiment of the present invention, the notification module 107 is connected to the internal insulation fault detection module 105, and is configured to generate and send an external insulation fault message to a vehicle (e.g., a fault management device of the vehicle) when the second insulation resistance satisfies a second preset condition; when the second insulation resistance does not satisfy the second preset condition, an internal insulation fault message is generated and transmitted to a vehicle (e.g., a fault management device of the vehicle).

Optionally, the insulation fault outside the battery box refers to that an electrically conductive 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 insulation resistance reduction.

Alternatively, the insulation failure inside the battery box refers to that an electric conduction path (for example, an electric conduction path formed by condensed water inside the battery box) exists between the positive electrode or the negative electrode inside the battery box and the battery box, so that the insulation resistance between the positive electrode or the negative electrode inside 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 internal insulation resistance of the battery box body meets the requirement, the detected insulation fault is the external insulation fault of the battery box body; and if the insulation resistance inside the battery box body does not meet the requirement, indicating that the insulation faults detected before at least comprise the insulation faults 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 in the battery box is connected with the wiring terminal of the motor of the vehicle can be distinguished from the insulation fault outside the battery box or inside the battery box, 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 the embodiment of the present invention, if an insulation fault inside the battery box is detected later, a control instruction for removing the condensed water inside the battery box may be sent to the vehicle to solve the insulation fault inside the battery box, for example, to increase the temperature inside the battery box, but the present invention is not limited thereto.

Specifically, in an embodiment of the present invention, the notification module 107 may be further configured to notify the vehicle to send a control instruction for increasing the temperature inside the battery box to the heating element inside the battery box to reduce the condensed water inside the battery box after generating and sending an internal insulation fault message to the vehicle (e.g., a fault management device of the vehicle).

Optionally, in the embodiment of the invention, the situation that high-voltage electric elements of the vehicle (such as a traction motor for pushing the vehicle) cannot continue to operate due to disconnection of the positive electrode or the negative electrode of the battery pack in the battery box and the connecting terminal of the motor of the vehicle, so that the performance of the vehicle is reduced, and a secondary dangerous situation can be caused due to loss of electric drive can be avoided. When the insulation resistance between the positive electrode or the negative electrode of the battery pack in the battery box body and the battery box body can meet the requirement, the battery pack can be restarted to operate.

Specifically, in the embodiment of the present invention, the internal insulation detection module 105 is further configured to detect whether a third insulation resistance between the positive electrode or the negative electrode of the battery pack in the battery box and the battery box satisfies a second preset condition after reducing the condensed water in the battery box; the connection control module 103 is configured to control connection between the positive electrode or the negative electrode of the battery pack in the battery box and a connection terminal of a motor of the vehicle when the third insulation resistance satisfies a second preset condition; the notification module 107 is further configured to generate and transmit an internal insulation fault message to a fault management device of the vehicle when the third insulation resistance does not satisfy a second preset condition.

Alternatively, in the embodiment of the present invention, if an insulation fault inside the battery box is detected later, a control instruction to remove the condensed water inside the battery box may be sent to the vehicle to solve the insulation fault inside the battery box, for example, to reduce the humidity of the gas entering the battery box, but is not limited thereto.

Specifically, in the embodiment of the present invention, the notification module 107 may be further configured to notify the vehicle to send a control instruction for reducing the humidity of the gas entering the battery box or increasing the temperature of the gas entering the battery box to a Heating Ventilation and Air Conditioning (HVAC) system after generating and sending a fault message of the insulation fault inside the battery box to the vehicle, so as to reduce the condensed water inside the battery box.

Optionally, in an embodiment of the present invention, the internal insulation detection module 105 may also be further configured to detect whether a third insulation resistance between the positive electrode or the negative electrode of the battery pack in the battery box and the battery box satisfies a second preset condition after reducing the condensed water in the battery box;

the connection control module 103 is further configured to control connection between a positive electrode or a negative electrode of a battery pack in the battery box and a connection terminal of a motor of the vehicle when detecting that the third insulation resistance satisfies a second preset condition; the notification module 107 is further configured to generate and send a fault message of insulation fault inside the battery box to a fault management device of the vehicle when the third insulation resistance does not satisfy a second preset condition.

In a more preferred embodiment, the notification module 107 is further connected to the system insulation fault detection module 101, when it is detected that the third insulation resistance satisfies the second preset condition, the connection control module 103 controls connection between the positive electrode or the negative electrode of the battery pack in the battery box and the connection terminal of the electric motor of the vehicle, the system insulation fault detection module 101 further detects whether the insulation resistance between the positive electrode or the negative electrode of the battery pack in the battery box and the chassis of the vehicle satisfies the first preset condition, and if not, the notification module generates and sends an external insulation fault message to the vehicle.

Optionally, in the embodiment of the present invention, before the battery pack operates, whether the insulation resistance between the positive electrode or the negative electrode of the battery pack in the battery box and the battery box meets the requirement may be determined, and when the requirement is met, the positive electrode or the negative electrode of the battery pack in the battery box is connected to the connection terminal of the motor of the vehicle; when the requirement is not met, the 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 an embodiment of the present invention, the internal insulation fault detection module 105 may be further configured to detect whether a fourth insulation resistance between the positive electrode or the negative electrode of the battery pack in the battery box and the battery box satisfies a second preset condition before the positive electrode or the negative electrode of the battery pack in the battery box is connected to a connection terminal of a motor of the vehicle;

the connection control module 103 may be further configured to connect the positive electrode or the negative electrode of the battery pack in the battery box and a connection terminal of a motor of the vehicle when the fourth insulation resistance satisfies a second preset condition; the notification module 107 may be further configured to send an internal insulation fault message to the vehicle when the fourth insulation resistance does not satisfy a second preset condition.

According to another aspect of the present invention, there is also provided a hybrid vehicle or an electric vehicle including: the fault management device of the vehicle is used for receiving fault messages sent by the battery management system. Embodiments of the present invention may disconnect the circuit inside the battery case from the circuit outside the battery case once an insulation fault is detected during normal operation of the vehicle. The internal insulation resistance of the battery case was then checked. If the internal insulation resistance of the battery box body meets the requirement, the detected insulation fault is the external insulation fault of the battery box body; and if the internal insulation resistance of the battery box body does not meet the requirement, the insulation fault detected before is the internal insulation fault of the battery box body. 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.

According to a third aspect of the present invention, corresponding to the battery management system 100 according to an 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, the battery management method 400 includes:

and S401, connecting the positive electrode or the negative electrode of the battery pack in the battery box with a connecting terminal of a motor of the vehicle.

Step S403, after the positive electrode or the negative electrode of the battery pack in the battery box is connected to the connection terminal of the motor of the vehicle, detecting whether a first insulation resistance between the positive electrode or the negative electrode of the battery pack in the battery box and the chassis of the vehicle satisfies a first preset condition.

In an embodiment of the present invention, an insulation resistance measurement circuit as shown in fig. 3 may be used to measure a first insulation resistance value between the positive or negative electrode of the battery pack in the battery box and the vehicle chassis. It is of course understood that the specific manner of measuring the first insulation resistance value between the positive electrode or the negative electrode of the battery pack in the battery box and the vehicle chassis is not limited in the embodiments of the present invention.

Referring to fig. 3, it is assumed that a voltage of a direct current system (i.e., a voltage of a power battery) of an Electric Vehicle (Electric Vehicle) is U, and insulation resistances between a positive electrode and a negative electrode of the power battery to be measured and a Vehicle chassis are R respectively_P、R_NThe voltages between the positive pole and the negative pole and the vehicle chassis are respectively U_P、U_NThen, the equivalent model of the dc system to be measured is shown in the dashed box of fig. 3.

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 body_C1And measuring the voltages between the positive electrode and the negative electrode of the power battery and the battery box body to be U respectively_PP、U_NPIt 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.

And S405, disconnecting the connection between the positive electrode or the negative electrode of the battery pack in the battery box and a connecting terminal of a motor of the vehicle when the first insulation resistor does not meet the first preset condition.

Specifically, the vehicle may be notified to generate and send a command to open the contactor 205 to disconnect the positive or negative pole of the battery pack 203 within the battery box 201 from the terminals of the vehicle's motor 209.

Step S407, after the positive electrode or the negative electrode of the battery pack in the battery box is disconnected with a connecting terminal of a motor of a vehicle, detecting whether a second insulation resistance between the positive electrode or the negative electrode of the battery pack in the battery box and the battery box meets a second preset condition;

In an embodiment of the present invention, an insulation resistance measurement circuit as shown in fig. 3 may be used to measure a second insulation resistance value between the positive electrode or the negative electrode of the battery pack in the battery case and the battery case. It is of course understood that the specific manner of measuring the second insulation resistance value between the positive electrode or the negative electrode of the battery pack in the battery box and the battery box is not limited in the embodiments of the present invention.

Step S409, when the second insulation resistance meets a second preset condition, generating and sending a fault message of the insulation fault outside the battery box body to the vehicle; and when the second insulation resistance does not meet the second preset condition, generating and sending a fault message of the insulation fault inside the battery box body to the vehicle.

Optionally, the insulation fault outside the battery box refers to that an electrically conductive 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 fault message may be used to prompt the driver of the vehicle to take appropriate action to address the problem of reduced insulation resistance.

Alternatively, the insulation failure inside the battery box refers to that an electric conduction path (for example, an electric conduction path formed by condensed water inside the battery box) exists between the positive electrode or the negative electrode inside the battery box and the battery box, so that the insulation resistance between the positive electrode or the negative electrode inside the battery box and the battery box is reduced. The 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 since a circuit inside a battery case is electrically connected to a circuit outside the battery case.

In the embodiment of the invention, the internal insulation fault and the external insulation fault of the battery box body can be separately detected, so that the internal insulation fault or the external insulation fault can be distinguished when the detected insulation fault occurs. 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 internal insulation resistance of the battery box body meets the requirement, the detected insulation fault is the external insulation fault of the battery box body; and if the insulation resistance inside the battery box body does not meet the requirement, indicating that the insulation faults detected before at least comprise the insulation faults 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 in the battery box is connected with the wiring terminal of the motor of the vehicle can be distinguished from the insulation fault outside the battery box or inside the battery box, 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 the embodiment of the present invention, if an insulation fault inside the battery box is detected later, a control instruction to remove the condensed water inside the battery box may be sent to the vehicle to solve the insulation fault inside the battery box, such as increasing the temperature inside the battery box, decreasing the humidity of the gas entering the battery box, or increasing the temperature of the gas entering the battery box, but is not limited thereto.

Optionally, in an embodiment of the present invention, after step S409, the method 400 further includes:

after generating and transmitting the battery box internal insulation fault message to the vehicle, informing the vehicle to transmit 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.

after generating and sending the battery box internal insulation fault message to the vehicle, informing the vehicle to send a control instruction for reducing the humidity of the gas entering the battery box or increasing the temperature of the gas entering the battery box to a Heating Ventilation and Air Conditioning (HVAC) system to reduce the condensed water in the battery box.

In the embodiment of the invention, the control instruction for reducing the condensed water in the battery box is sent to the vehicle, so that the condensed water in the battery box is removed, the insulation resistance between the positive electrode or the negative electrode of the battery pack in the battery box and the battery box is ensured to meet the requirement, the running reliability of the vehicle is improved, and the safety of a vehicle driver and passengers is ensured.

The problem that the positive pole or the negative pole of a battery pack in a battery box body is disconnected with a connecting terminal of a motor of a vehicle, so that high-voltage electric elements of the vehicle (such as a traction motor for pushing the vehicle) cannot continue to operate, the performance of the vehicle is further reduced, and secondary dangerous situations can be avoided due to the fact that electric driving is lost. Optionally, in the embodiment of the present invention, when the insulation resistance between the positive electrode or the negative electrode of the battery pack in the battery box and the battery box can meet the requirement, the operation of the battery pack may be restarted.

Specifically, in an embodiment of the present invention, the method 400 further comprises:

after the condensed water in the battery box is reduced, detecting whether a third insulation resistance between the positive electrode or the negative electrode of the battery pack in the battery box and the battery box meets a second preset condition;

In the embodiment of the invention, before the battery pack runs, whether the insulation resistance between the positive electrode or the negative electrode of the battery pack in the battery box body and the battery box body meets the requirement or not can be judged, and when the requirement is met, the positive electrode or the negative electrode of the battery pack in the battery box body is connected with the connecting terminal of the motor of the vehicle; when the requirement is not met, the 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.

Optionally, in an embodiment of the present invention, the method 400 further includes:

before the positive pole or the negative pole of the battery pack in the battery box body is connected with a connecting terminal of a motor of a vehicle, detecting whether a fourth insulation resistance between the positive pole or the negative pole of the battery pack in the battery box body and the battery box body meets a second preset condition;

In a more preferred embodiment, when it is detected that the third insulation resistance satisfies the second preset condition, connecting a terminal for controlling the positive electrode or the negative electrode of the battery pack in the battery box and the motor of the vehicle; and further detecting whether the insulation resistance between the anode or the cathode of the battery pack in the battery box and the vehicle chassis meets a first preset condition, and if not, generating and sending an external insulation fault message to the vehicle.

Fig. 5 shows 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 electrode or the negative electrode of the battery pack in the battery box and the battery box. It is of course understood that the specific manner of measuring the insulation resistance value between the positive electrode or the negative electrode of the battery pack in the battery box and the vehicle box is not limited in the embodiments of the present invention.

Step S505, judging whether the insulation resistance in the battery box body meets the requirement, if so, entering 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 entering step S513;

step S513, executing an external insulation resistance of the battery box, which may also be referred to as a detection system insulation resistance;

step S515, judging whether the external insulation resistance of the battery box body meets the requirement, if so, normally operating, and returning to the step S513; otherwise, entering step S517;

step S517, reporting that the external insulation resistance of the battery box body does not meet the requirement, and then entering step S519;

step S519, the contactor is opened, that is, the connection between the internal circuit of the battery case and the external circuit of the battery case is disconnected.

Step S521, executing insulation resistance detection in the battery box body;

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 the external insulation fault of 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;

and step S531, detecting the insulation resistance in the battery box body.

Step S533, judging whether the insulation resistance in the battery box body meets the requirement, if so, executing step S537; otherwise, go to step S535;

and step S535, reporting that the insulation fault in the battery box body is cleared, and then returning to the step S509 to restart the battery.

Step 537, reporting the internal insulation fault of the battery case to the vehicle, and then returning to step 531.

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

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 system comprises a system insulation fault detection module, a connection control module, an internal insulation fault detection module and a notification module; wherein,

the system insulation fault detection module is used for detecting whether a first insulation resistance between the positive electrode or the negative electrode of the battery pack in the battery box and a vehicle chassis meets a first preset condition or not after the positive electrode or the negative electrode of the battery pack in the battery box is connected with a wiring terminal of a motor of a vehicle;

the connection control module is connected with the system insulation fault detection module and the internal insulation fault detection module and is used for controlling the connection/disconnection of the positive electrode or the negative electrode of the battery pack in the battery box and a wiring terminal of a motor of a vehicle; the connection control module controls the positive pole or the negative pole of the battery pack in the battery box to be disconnected with a wiring terminal of a motor of the vehicle when the first insulation resistor does not meet a first preset condition;

the internal insulation fault detection module is used for detecting whether a second insulation resistance between the positive electrode or the negative electrode of the battery pack in the battery box and the battery box meets a second preset condition or not after the positive electrode or the negative electrode of the battery pack in the battery box is disconnected with a wiring terminal of a motor of a vehicle;

the notification module is connected with the internal insulation fault detection module and used for generating and sending an external insulation fault message to the vehicle when the second insulation resistor meets a second preset condition; and when the second insulation resistance does not meet a second preset condition, generating and sending an internal insulation fault message to the vehicle.

2. The system of claim 1, wherein:

the notification module is further configured to, after generating and sending an internal insulation fault message to a vehicle, notify the 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.

3. The system of claim 2, wherein:

the internal insulation fault detection module is further configured to detect whether a third insulation resistance between the positive electrode or the negative electrode of the battery pack in the battery box and the battery box meets a second preset condition after the condensed water in the battery box is reduced;

4. The system of claim 1, wherein:

the notification module is further configured to notify the vehicle to send a control instruction for reducing the humidity of the gas entering the battery box or increasing the temperature of the gas entering the battery box to a heating, ventilation and air conditioning control system after generating and sending a battery box internal insulation fault message to the vehicle, so as to reduce condensed water in the battery box.

5. The system of claim 4, wherein:

the connection control module is further configured to control connection between a positive electrode or a negative electrode of a battery pack in the battery box and a connection terminal of a motor of the vehicle when the third insulation resistance is detected to meet a second preset condition; the notification module is further configured to generate and transmit the battery case internal insulation fault message to a fault management device of a vehicle when the third insulation resistance does not satisfy a second preset condition.

6. The system of claim 1, wherein:

the internal insulation fault detection module is further configured to detect whether a fourth insulation resistance between the positive electrode or the negative electrode of the battery pack in the battery box and the battery box meets a second preset condition before the positive electrode or the negative electrode of the battery pack in the battery box is connected with a connecting terminal of a motor of a vehicle;

7. A gasoline-electric hybrid vehicle or an electric vehicle, comprising: a fault management device of a vehicle and a battery management system according to any one of claims 1 to 6, wherein the fault management device of the vehicle is configured to receive a fault message sent by the battery management system.

8. A battery management method for a vehicle including a battery pack and a battery case for housing the battery pack, the method comprising:

a connecting terminal for connecting the positive electrode or the negative electrode of the battery pack in the battery box body and a motor of a vehicle;

after the positive pole or the negative pole of the battery pack in the battery box body is connected with a wiring terminal of a motor of a vehicle, detecting whether a first insulation resistance between the positive pole or the negative pole of the battery pack in the battery box body and a chassis of the vehicle meets a first preset condition;

when the first insulation resistor does not meet a first preset condition, disconnecting the positive electrode or the negative electrode of the battery pack in the battery box from a connecting terminal of a motor of the vehicle;

after the positive electrode or the negative electrode of the battery pack in the battery box is disconnected with a connecting terminal of a motor of a vehicle, detecting whether a second insulation resistance between the positive electrode or the negative electrode of the battery pack in the battery box and the battery box meets a second preset condition;

when the second insulation resistance meets a second preset condition, generating and sending a fault message of the insulation outside the battery box body to a vehicle; and when the second insulation resistance does not meet a second preset condition, generating and sending a fault message of insulation inside the battery box body to the vehicle.

9. The method of claim 8, further comprising:

10. The method of claim 8, further comprising:

11. The method according to claim 9 or 10, characterized in that the method further comprises:

when the third insulation resistance meets a second preset condition, controlling the connection between the positive electrode or the negative electrode of the battery pack in the battery box and a wiring terminal of a motor of the vehicle; and when the third insulation resistance does not meet a second preset condition, generating and sending a fault message of insulation inside the battery box body to fault management equipment of the vehicle.

12. The method of claim 8, further comprising:

when the fourth insulation resistance meets a second preset condition, connecting the positive electrode or the negative electrode of the battery pack in the battery box body with a wiring terminal of a motor of the vehicle; and when the fourth insulation resistance does not meet a second preset condition, generating and sending a fault message of insulation inside the battery box body to the vehicle.