阅读说明：本技术 新能源汽车的动力电池的上下电的方法及装置 (Power supply and discharge method and device for power battery of new energy automobile ) 是由 牛满岗 黄河 刘进程 张彪 龙宇舟 贺荣 于 2019-10-23 设计创作，主要内容包括：本发明提供了一种新能源汽车的动力电池的上下电的方法及装置,应用于电池管理系统的控制器,在上电过程中,通过在接收到整车控制器发送的唤醒指令；判断电池管理系统是否正常；若判断出电池管理系统正常,则等待整车控制器发送闭合电池管理系统中的主继电器指令；若接收到整车控制器发送闭合电池管理系统中的主继电器指令,闭合电池管理系统中的主继电器；在下电过程中,通过接收到整车控制器发出的下电指令；判断电池管理系统采集的当前主电路电流值是否正常；若判断出电池管理系统采集的当前主电路电流值正常,断开电池管理系统中的主继电器。以此来避免动力电池在进行上下电过程中,电池高压回路中的电器部件受到脉冲电流冲击带来的损伤。(The invention provides a method and a device for powering on and powering off a power battery of a new energy automobile, which are applied to a controller of a battery management system, wherein in the powering on process, a wake-up instruction sent by a whole vehicle controller is received; judging whether the battery management system is normal or not; if the battery management system is judged to be normal, waiting for the whole vehicle controller to send a main relay instruction for closing the battery management system; if a main relay instruction in a battery management system is sent by the vehicle control unit to be closed, closing a main relay in the battery management system; in the power-off process, a power-off instruction sent by the whole vehicle controller is received; judging whether the current value of the main circuit collected by the battery management system is normal or not; and if the current value of the main circuit collected by the battery management system is judged to be normal, disconnecting the main relay in the battery management system. Therefore, the damage of electrical components in a high-voltage circuit of the battery caused by pulse current impact in the power battery power-on and power-off processes is avoided.)

1. A method for electrifying a power battery of a new energy automobile is characterized in that the method is applied to a controller of a battery management system and comprises the following steps:

receiving a wake-up instruction sent by the vehicle control unit, and judging whether the battery management system is normal;

if the battery management system is judged to be normal, waiting for the vehicle control unit to send a main relay instruction for closing the battery management system;

and if receiving a command of closing the main relay in the battery management system sent by the vehicle control unit, closing the main relay in the battery management system.

2. The method of claim 1, wherein determining whether the battery management system is normal comprises:

judging whether the data collected in the battery management system is normal or not; wherein, the data collected in the battery management system comprises: the single voltage and temperature information of each daughter board in the battery management system and the insulation resistance value of the high-voltage acquisition board;

if the single voltage of each daughter board in the battery management system is normal, the temperature information is normal, and the insulation group value of the high-voltage acquisition board is larger than a preset insulation resistance value, the battery management system is normal;

and if any abnormal data in the battery management system is judged, the battery management system is abnormal.

3. The method of claim 1, wherein prior to closing a main relay in the battery management system, further comprising:

judging whether a main relay in the battery management system has a fault;

if the main relay in the battery management system is judged to be in fault, the fault is sent to the vehicle control unit;

and if the main relay in the battery management system is judged not to have a fault, closing the main relay in the battery management system.

4. A method for powering down a power battery of a new energy automobile is characterized in that the method is applied to a controller of a battery management system and comprises the following steps:

receiving a power-off instruction sent by the vehicle control unit, and judging whether the current value of the main circuit collected by the battery management system is normal or not;

and if the current value of the main circuit collected by the battery management system is judged to be normal, disconnecting the main relay in the battery management system.

5. The method of claim 4, wherein the determining whether the current main circuit current value collected by the battery management system is normal comprises:

judging whether the current acquired by a current sensor in the battery management system is smaller than a preset current or not;

and if the current acquired by the current sensor in the battery management system is judged to be smaller than the preset current, the high-voltage loop is normal.

6. The method according to claim 5, wherein the determining whether the current obtained by the current sensor in the battery management system is less than a preset current further comprises:

if the current acquired by the current sensor in the battery management system is judged to be larger than or equal to the preset current, continuously judging whether the current acquired by the current sensor in the battery management system is smaller than the preset current within a preset time;

if the current acquired by the current sensor in the battery management system is smaller than the preset current within the preset time, the high-voltage loop is normal, and a main relay in the battery management system is disconnected;

and if the current acquired by the current sensor in the battery management system is greater than or equal to the preset current after the preset time is over, recording fault information of the device with load cut-off, and disconnecting a main relay in the battery management system.

7. The method of claim 5, further comprising:

if an alarm system in a battery management system gives an alarm, acquiring fault information of a fault in the battery management system;

sending the fault information and a command for requesting emergency power-off to a vehicle controller;

after the emergency power-off instruction is received, judging whether the current acquired by a current sensor in the battery management system is smaller than a preset current or not;

if the current acquired by the current sensor in the battery management system is judged to be smaller than the preset current, the high-voltage loop is normal, and a main relay in the battery management system is disconnected;

if the current acquired by the current sensor in the battery management system is judged to be larger than or equal to the preset current, continuously judging whether the current acquired by the current sensor in the battery management system is smaller than the preset current within a preset time;

if the current acquired by the current sensor in the battery management system is smaller than the preset current within the preset time, the high-voltage loop is normal, and a main relay in the battery management system is disconnected;

and if the current acquired by the current sensor in the battery management system is greater than or equal to the preset current after the preset time is over, recording fault information of the device with load cut-off, and disconnecting a main relay in the battery management system.

8. The utility model provides a device of power battery's of new energy automobile power-on, characterized in that, be applied to the controller of battery management system, includes:

the first judgment unit is used for receiving a wake-up instruction sent by the vehicle control unit and judging whether the battery management system is normal or not;

the waiting unit is used for waiting for the vehicle control unit to send a main relay instruction for closing the battery management system if the first judging unit judges that the battery management system is normal;

and the closing unit is used for closing a main relay in the battery management system if the waiting unit receives a command of closing the main relay in the battery management system sent by the vehicle control unit.

9. The apparatus according to claim 8, wherein the first determining unit comprises:

the receiving unit is used for receiving a wake-up instruction sent by the vehicle control unit;

the judging subunit is used for judging whether the data collected in the battery management system is normal or not; wherein, the data collected in the battery management system comprises: the single voltage and temperature information of each daughter board in the battery management system and the insulation resistance value of the high-voltage acquisition board;

if the judging subunit judges that the voltage of each daughter board in the battery management system is normal, the temperature information is normal, and the insulation group value of the high-voltage acquisition board is greater than the preset insulation resistance value, the battery management system is normal;

and if the judging subunit judges that any one of the data collected in the battery management system is abnormal, the battery management system is abnormal.

10. The utility model provides a device of power battery of new energy automobile's unloading which characterized in that, is applied to the controller of battery management system, includes:

the second judgment unit is used for receiving a power-off instruction sent by the vehicle control unit and judging whether the current value of the main circuit collected by the battery management system is normal or not;

and the disconnection unit is used for disconnecting a main relay in the battery management system if the second judgment unit judges that the current main circuit current value collected by the battery management system is normal.

Technical Field

The invention relates to the technical field of signal processing, in particular to a method and a device for powering on and powering off a power battery of a new energy automobile.

Background

With the development of the automobile industry and the progress of science and technology, more and more new energy automobiles enter the sight of people. However, most people still hold the observation attitude of new energy vehicles, wherein the important reason is that the safety problems of vehicle-mounted power batteries and circuits of the new energy vehicles cannot be guaranteed.

At present, in the process of powering on and powering off the vehicle-mounted power battery, a circuit where the power battery is located may be impacted by pulse current, so that electrical components in a high-voltage circuit of the battery are damaged. For example, in a relay in a high-voltage circuit of a battery, the number of times of the on-load service life of the relay is limited, that is, the number of times that the relay contact can be cut off when the relay is under load is limited, and if a circuit where a power battery is located is impacted by pulse current when the power battery is powered on and powered off, the relay is damaged, and the service life is reduced.

Disclosure of Invention

In view of this, the embodiment of the present invention provides a method and an apparatus for powering on and powering off a power battery of a new energy vehicle, so as to avoid damage to electrical components in a high voltage circuit of the power battery due to impulse current during powering on and powering off the power battery.

In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:

a method for electrifying a power battery of a new energy automobile is applied to a controller of a battery management system and comprises the following steps:

receiving a wake-up instruction sent by the vehicle control unit, and judging whether the battery management system is normal;

if the battery management system is judged to be normal, waiting for the vehicle control unit to send a main relay instruction for closing the battery management system;

and if receiving a command of closing the main relay in the battery management system sent by the vehicle control unit, closing the main relay in the battery management system.

Optionally, the determining whether the battery management system is normal includes:

judging whether the data collected in the battery management system is normal or not; wherein, the data collected in the battery management system comprises: the single voltage and temperature information of each daughter board in the battery management system and the insulation resistance value of the high-voltage acquisition board;

if the single voltage of each daughter board in the battery management system is normal, the temperature information is normal, and the insulation group value of the high-voltage acquisition board is larger than a preset insulation resistance value, the battery management system is normal;

and if any abnormal data in the battery management system is judged, the battery management system is abnormal.

Optionally, before closing the main relay in the battery management system, the method further includes:

judging whether a main relay in the battery management system has a fault;

if the main relay in the battery management system is judged to be in fault, the fault is sent to the vehicle control unit;

and if the main relay in the battery management system is judged not to have a fault, closing the main relay in the battery management system.

A method for powering down a power battery of a new energy automobile is applied to a controller of a battery management system and comprises the following steps:

receiving a power-off instruction sent by the vehicle control unit, and judging whether the current value of the main circuit collected by the battery management system is normal or not;

and if the current value of the main circuit collected by the battery management system is judged to be normal, disconnecting the main relay in the battery management system.

Optionally, the determining whether the current value of the main circuit collected by the battery management system is normal includes:

judging whether the current acquired by a current sensor in the battery management system is smaller than a preset current or not;

and if the current acquired by the current sensor in the battery management system is judged to be smaller than the preset current, the high-voltage loop is normal.

Optionally, the determining whether the current acquired by the current sensor in the battery management system is smaller than a preset current further includes:

if the current acquired by the current sensor in the battery management system is judged to be larger than or equal to the preset current, continuously judging whether the current acquired by the current sensor in the battery management system is smaller than the preset current within a preset time;

if the current acquired by the current sensor in the battery management system is smaller than the preset current within the preset time, the high-voltage loop is normal, and a main relay in the battery management system is disconnected;

and if the current acquired by the current sensor in the battery management system is greater than or equal to the preset current after the preset time is over, recording fault information of the device with load cut-off, and disconnecting a main relay in the battery management system.

Optionally, the power battery power-off method of the new energy automobile further includes:

if an alarm system in a battery management system gives an alarm, acquiring fault information of a fault in the battery management system;

sending the fault information and a command for requesting emergency power-off to a vehicle controller;

after the emergency power-off instruction is received, judging whether the current acquired by a current sensor in the battery management system is smaller than a preset current or not;

if the current acquired by the current sensor in the battery management system is judged to be smaller than the preset current, the high-voltage loop is normal, and a main relay in the battery management system is disconnected;

if the current acquired by the current sensor in the battery management system is judged to be larger than or equal to the preset current, continuously judging whether the current acquired by the current sensor in the battery management system is smaller than the preset current within a preset time;

if the current acquired by the current sensor in the battery management system is smaller than the preset current within the preset time, the high-voltage loop is normal, and a main relay in the battery management system is disconnected;

and if the current acquired by the current sensor in the battery management system is greater than or equal to the preset current after the preset time is over, recording fault information of the device with load cut-off, and disconnecting a main relay in the battery management system.

A device for electrifying a power battery of a new energy automobile is applied to a controller of a battery management system and comprises:

the first judgment unit is used for receiving a wake-up instruction sent by the vehicle control unit and judging whether the battery management system is normal or not;

the waiting unit is used for waiting for the vehicle control unit to send a main relay instruction for closing the battery management system if the first judging unit judges that the battery management system is normal;

and the closing unit is used for closing a main relay in the battery management system if the waiting unit receives a command of closing the main relay in the battery management system sent by the vehicle control unit.

Optionally, the first determining unit includes:

the receiving unit is used for receiving a wake-up instruction sent by the vehicle control unit;

the judging subunit is used for judging whether the data collected in the battery management system is normal or not; wherein, the data collected in the battery management system comprises: the single voltage and temperature information of each daughter board in the battery management system and the insulation resistance value of the high-voltage acquisition board;

if the judging subunit judges that the voltage of each daughter board in the battery management system is normal, the temperature information is normal, and the insulation group value of the high-voltage acquisition board is greater than the preset insulation resistance value, the battery management system is normal;

and if the judging subunit judges that any one of the data collected in the battery management system is abnormal, the battery management system is abnormal.

A device for powering down a power battery of a new energy automobile is applied to a controller of a battery management system and comprises:

the second judgment unit is used for receiving a power-off instruction sent by the vehicle control unit and judging whether the current value of the main circuit collected by the battery management system is normal or not;

and the disconnection unit is used for disconnecting a main relay in the battery management system if the second judgment unit judges that the current main circuit current value collected by the battery management system is normal.

According to the scheme, the method and the device for powering on and powering off the power battery of the new energy automobile, provided by the invention, are applied to the controller of the battery management system, and the method comprises the following steps: in the power-on process, after a wake-up instruction sent by the vehicle control unit is received; judging whether the battery management system is normal or not; if the battery management system is judged to be normal, waiting for the vehicle control unit to send a main relay instruction for closing the battery management system; if a command of closing a main relay in the battery management system sent by the vehicle control unit is received, closing the main relay in the battery management system; in the power-off process, after a power-off instruction sent by the vehicle control unit is received; judging whether the current value of the main circuit collected by the battery management system is normal or not; and if the current value of the main circuit collected by the battery management system is judged to be normal, disconnecting the main relay in the battery management system. The damage caused by impulse current impact on electrical components in a high-voltage loop of the battery in the power battery power-on and power-off process of the new energy automobile is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a circuit topology diagram of a battery management system according to an embodiment of the present invention;

fig. 2 is a specific flowchart of a method for powering up a power battery of a new energy vehicle according to an embodiment of the present invention;

fig. 3 is a flowchart illustrating a method for powering up a power battery of a new energy vehicle according to another embodiment of the present invention;

fig. 4 is a flowchart illustrating a method for powering down a power battery of a new energy vehicle according to another embodiment of the present invention;

fig. 5 is a flowchart illustrating a method for powering down a power battery of a new energy vehicle according to another embodiment of the present invention;

fig. 6 is a flowchart illustrating a method for powering down a power battery of a new energy vehicle according to another embodiment of the present invention;

fig. 7 is a schematic diagram of an apparatus for powering up a power battery of a new energy vehicle according to another embodiment of the present invention;

fig. 8 is a schematic diagram of an apparatus for powering up a power battery of a new energy vehicle according to another embodiment of the present invention;

fig. 9 is a schematic view of a device for powering down a power battery of a new energy vehicle according to another embodiment of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention relates to a battery management system, which belongs to a main power supply unit of a current new energy automobile, and the battery system of the current new energy automobile mainly comprises: a plurality of battery boxes, a junction box and a control box.

The battery box mainly comprises a battery box body, a battery core, a battery management system slave plate, a high-low voltage connector, a plurality of wire harnesses and the like; the control box mainly comprises a battery management system mainboard, a power distribution module, a plurality of wire harnesses and the like; the junction box mainly comprises a manual maintenance switch, a current sensor, a relay, a high-voltage acquisition board, a plurality of wire harnesses and the like; the battery management system slave board mainly collects the internal temperature and voltage conditions of the battery box body and reports the voltage of each battery cell and the temperature value of each temperature sensor to the battery management system master board; the high-voltage acquisition board is used for acquiring the voltage and the insulation resistance value of the battery, judging the adhesion of the relay and reporting the adhesion to a main board of the battery management system; the battery management system mainboard is used for receiving information reported by the battery management system slave boards, the high-voltage acquisition board and the current sensor of each battery box, carrying out state estimation on the battery module according to the information (such as the charge state, the power state and the service life state of the battery module), controlling the charge and discharge of the battery system and controlling a heating relay, carrying out fault processing and data recording, and carrying out information interaction with the whole vehicle; the manual maintenance switch is used for short-circuit protection parts of the battery system and quick maintenance and development; the power distribution module is used for preventing the whole vehicle low-voltage circuit from being connected with the battery DC/DC low-voltage circuit in series.

Specifically, the terminal box is connected between control box and a plurality of battery box, and mainly used protects battery management system's circuit safety, and the circuit in the terminal box among the prior art is at the battery management system in-process of powering down, can't avoid impulse current's impact, leads to the electrical apparatus part in the circuit to receive the damage, and the life-span reduces.

Therefore, an embodiment of the present invention provides a power-on/power-off method and device for a power battery of a new energy vehicle, which are applied to an improved battery management system, wherein a circuit topology diagram of the improved battery management system, as shown in fig. 1, includes:

a first charge and discharge unit 100, a second charge and discharge unit 200, a first heating unit 300, and a second heating unit 300.

A connection branch between the first charging and discharging unit 100 and the first heating unit 300 is connected between the battery pack 400 and the vehicle control unit 500; and, a connection point of the first charge and discharge unit 100 and the first heating unit 300 is connected to the dc conversion circuit 600.

The connection branch between the second charging and discharging unit 200 and the second heating unit 400 is connected between the battery pack 400 and the vehicle controller 500; and, a connection point of the second charge and discharge unit 200 and the second heating unit 400 is connected to the dc conversion circuit 600.

Wherein the first charge and discharge unit 100 includes: a first charging relay unit and a first discharging relay unit. The first charger unit comprises a series branch of a first charging relay and a first resistor; the first discharge relay unit includes: a series branch of a first discharge relay and a second resistor; a connection point of a first end of the first discharge relay unit and a second end of the first discharge relay unit is connected to the first heating unit 300; the second end of the first discharging relay unit is connected with a discharging positive interface of the vehicle control unit 500; the second end of the first charging relay unit is connected with the positive charging interface of the vehicle control unit 500.

The second charge and discharge unit 200 includes: a third resistor and a second charge relay unit; wherein the second charge relay unit includes a series branch of a second charge relay and a fourth resistor; a connection point of a first end of the third resistor and a first end of the second charge relay unit, connected to the second heating unit 400; the second end of the third resistor is connected with the discharging cathode interface of the vehicle control unit 500; the second end of the second charging relay unit is connected to the charging negative interface of the vehicle control unit 500.

The first heating unit 300 includes: a fifth resistor and a first heating relay unit; wherein the first heating relay unit comprises a series branch of a first heating relay and a sixth resistor; a connection branch of a first end of the fifth resistor and a first end of the first heating relay unit, connected to the first charge and discharge unit 100; the second end of the fifth resistor is connected with the anode of the battery pack; the second end of the first heating relay unit is connected with the heating input end of the battery pack.

The second heating unit 400 includes: a current detection unit and a second heating relay unit; wherein the current detection unit comprises a current sensor, a manual maintenance switch and a seventh resistor; the second relay unit comprises a fuse, an eighth resistor and a second heating relay; a connection point of the manual maintenance switch and the second heating relay is connected to the second charge and discharge unit 200; the current detection unit is connected with the negative electrode of the battery pack; the fuse is connected with the heating output end of the battery pack.

It should be noted that, by adding the current detection unit in the second heating unit 400 to monitor the current in the circuit in real time, the subsequent power-on and power-off logic of the power battery of the new energy vehicle provided in the embodiment of the present invention is implemented.

It should be further noted that the protection circuit in the battery management system according to the embodiment of the present invention is the circuit in the aforementioned junction box; the controller in the battery management system according to the embodiment of the present invention is the above-mentioned control box.

The method for powering up the power battery of the new energy automobile provided by the embodiment of the invention is applied to a controller of a battery management system, and as shown in fig. 2, the method comprises the following steps:

s201, receiving a wake-up instruction sent by the vehicle control unit, and judging whether the battery management system is normal.

The awakening instruction sent by the vehicle control unit can be automatically sent by a user after pressing a one-key starting button; the wake-up command may be sent to a controller of the battery management system when the user is charging the power battery.

It should be noted that the wake-up instruction may be understood as an instruction for waking up a battery pack in the battery management system, where the instruction is sent by the vehicle controller to the controller in the battery management system after receiving an instruction of a user, and the controller in the battery management system performs an operation of waking up the battery pack, that is, controls the battery pack to be powered on.

It should be further noted that, the judgment of whether the battery management system is normal may be to check the entire circuit in the battery management system, and may also be to check the closing status of each device in the circuit before the battery pack is awakened, whether the closing status is a preset and correct closing status, by checking the current, the voltage, and the like in the circuit.

Specifically, if the battery management system is determined to be normal, step S202 is executed; if the battery management system is judged to be abnormal, the fault is reported to the vehicle control unit, the vehicle control unit prompts a user that the current battery management system is abnormal, and whether to continue powering up or not is determined by the user after the continuous starting possibly affected by the pulse current.

Optionally, in another embodiment of the present invention, an implementation manner of determining whether the battery management system is normal in step S201 includes:

and judging whether the data collected in the battery management system is normal or not.

Wherein, the data of gathering in the battery management system include: cell voltage, temperature information and insulation resistance value of each device in the battery management system.

Specifically, if the single voltage of each daughter board acquired by the battery management system is normal and the temperature information is normal, and the detected insulation resistance value of the high-voltage acquisition board is greater than the preset insulation resistance value, it indicates that the battery management system is normal; if the single voltage and temperature information of each daughter board acquired by the battery management system are abnormal or the insulation resistance value of the high-voltage acquisition board detected in an insulation manner is smaller than the preset insulation resistance value, the battery management system is indicated to have a fault, and after the fault is ended, the single voltage and temperature information of each daughter board acquired by the battery management system are normal and the insulation resistance value of the high-voltage acquisition board detected in an insulation manner is larger than the preset insulation resistance value, and then the subsequent steps are carried out.

S202, judging whether a main relay instruction sent by the vehicle control unit to close the battery management system is received.

Specifically, if it is determined that a command for closing a main relay in the battery management system sent by the vehicle control unit is received, step S203 is executed; and if the main relay instruction in the battery management system sent by the vehicle control unit is judged not to be received, waiting until the main relay instruction in the battery management system sent by the vehicle control unit is received.

And S203, closing a main relay in the battery management system.

Optionally, in another embodiment of the present invention, as shown in fig. 3, an implementation manner of step S203 includes:

s301, judging whether a main relay in the battery management system has a fault.

The main relay generally has an aging adhesion caused by the long service time of the main relay.

In the specific implementation process of this embodiment, the determination may be performed by determining whether the voltage across the front and rear ends of the relay is greater than the total voltage in the circuit, for example, V1 is greater than or equal to U × 90%, where U is the total voltage in the circuit, and V1 is the voltage difference between the front and rear ends of the relay; at this time, it can be judged that the relay is adhered. The total voltage in the circuit can be collected in real time by using a high-voltage collecting plate in the junction box.

Specifically, if it is determined that a main relay in the battery management system has a fault, step S302 is executed; if it is determined that the main relay in the battery management system is not in failure, step S303 is executed.

And S302, sending the fault to the vehicle control unit.

Specifically, the fault is reported to the vehicle control unit, and the vehicle control unit prompts a user that the current battery management system is abnormal, so that certain high-voltage potential safety hazards can occur when the vehicle control unit is continuously started, and the vehicle control unit is prohibited from starting.

And S303, closing a main relay in the battery management system.

The embodiment of the invention provides a method for powering down a power battery of a new energy automobile, which is applied to a controller of a battery management system, and as shown in fig. 4, the method comprises the following steps:

s401, receiving a power-off instruction sent by the vehicle control unit, and judging whether the current main circuit current value acquired by the battery management system is normal.

The power-off instruction sent by the vehicle control unit can be automatically sent out after a user presses a one-key starting button; the power-off command may be sent to the controller of the battery management system after the user has finished charging the power battery.

It should be noted that the power-off instruction may be understood as an instruction for powering off the battery pack in the battery management system, where the vehicle control unit sends the instruction to the controller in the battery management system after receiving the instruction from the user, and the controller in the battery management system then performs a power-off operation on the battery pack, that is, controls the power-off of the battery pack.

It should be further noted that, the judgment of whether the battery management system is normal may be to check the entire circuit in the battery management system, and may also be to check the closing status of each device in the circuit before the battery pack is awakened, whether the closing status is a preset and correct closing status, by checking the current, the voltage, and the like in the circuit.

Specifically, if the battery management system is determined to be normal, step S402 is executed.

Optionally, in another embodiment of the present invention, an implementation manner of determining whether the current main circuit current value collected by the battery management system in step S401 is normal includes:

and judging whether the current acquired by a current sensor in the battery management system is smaller than a preset current.

Specifically, if the current acquired by a current sensor in the battery management system is judged to be smaller than the preset current, it is indicated that the high-voltage loop is normal; if the current acquired by the current sensor in the battery management system is judged to be greater than or equal to the preset current, the pulse current impact exists in the high-voltage loop, and after the pulse current impact is finished, namely the current acquired by the current sensor in the high-voltage loop is smaller than the preset current, the subsequent steps are carried out.

Optionally, in another embodiment of the present invention, an implementation manner of determining whether the current main circuit current value collected by the battery management system in step S401 is normal is further included, as shown in fig. 5:

s501, judging whether the current acquired by a current sensor in the battery management system is smaller than a preset current.

Specifically, if it is determined that the current obtained by the current sensor in the battery management system is greater than or equal to the preset current, step S502 is executed.

S502, continuously judging whether the current acquired by a current sensor in the battery management system is smaller than the preset current within the preset time.

Specifically, if the current acquired by a current sensor in the battery management system is smaller than a preset current within a preset time, it indicates that the high-voltage loop is normal; if the current acquired by the current sensor in the battery management system is greater than or equal to the preset current after the preset time is over, recording the fault information of the device with load cut-off, and disconnecting the main relay in the battery management system, namely finishing power-off.

And S402, disconnecting a main relay in the battery management system.

Optionally, in another embodiment of the present invention, in the process of implementing the method for powering down the additional power battery of the new energy vehicle, as shown in fig. 6, the method further includes:

s601, if an alarm system in the battery management system gives an alarm, acquiring fault information of faults in the battery management system.

It should be noted that, during the operation of the battery management system, it can also be understood that a fault occurs suddenly during the driving process or the charging process of the electric vehicle, and when an emergency power off is required, an alarm is sent out by an alarm system in the battery management system to remind a user that the fault occurs, and then fault information of the fault is obtained.

In the specific implementation process of this embodiment, the severity of the fault may be rated once according to the fault information of the fault, such as a level a, a level B, a level C, and the like, where the level a is the most dangerous fault level; and prompting whether the user needs to power off emergently or not through the danger level. The user can select whether to power off according to the judgment of the user on the fault level.

And S602, sending fault information and an emergency power-off request to the vehicle control unit.

Specifically, after the fault information and the emergency power-off request command are sent to the vehicle control unit, the user can know that the electric vehicle has a fault at the first time, the specific fault information can be inquired and known through an external display of the vehicle control unit, and meanwhile, the user can select whether to confirm the emergency power-off according to actual conditions after receiving the emergency power-off request command.

And S603, after receiving the emergency power-off instruction, judging whether the current acquired by a current sensor in the battery management system is smaller than a preset current.

Specifically, after receiving the confirmation of the user that the request sent before is urgent power off, if the current acquired by the current sensor in the battery management system is judged to be smaller than the preset current, the high-voltage loop is normal, the power off operation can be directly performed, namely, the main relay in the battery management system is disconnected; if it is determined that the current obtained by the current sensor in the battery management system is greater than or equal to the preset current, step S604 is executed.

S604, continuously judging whether the current acquired by a current sensor in the battery management system is smaller than a preset current within a preset time.

Specifically, a buffering preset time can be allowed to be given in the emergency power-off process, and if the current acquired by a current sensor in the battery management system is smaller than the preset current within the preset time, it indicates that the high-voltage loop is normal; and if the current acquired by the current sensor in the battery management system is greater than or equal to the preset current after the preset time is over, recording the fault information of the device with load cut-off, and disconnecting the main relay in the battery management system.

According to the scheme, the power-on and power-off method of the power battery of the new energy automobile, which is provided by the invention, is applied to the controller of the battery management system and comprises the following steps: in the power-on process, after a wake-up instruction sent by the vehicle control unit is received; judging whether the battery management system is normal or not; if the battery management system is judged to be normal, waiting for the vehicle control unit to send a main relay instruction for closing the battery management system; if a command of closing a main relay in the battery management system sent by the vehicle control unit is received, closing the main relay in the battery management system; in the power-off process, after a power-off instruction sent by the vehicle control unit is received; judging whether the current value of the main circuit collected by the battery management system is normal or not; and if the current value of the main circuit collected by the battery management system is judged to be normal, disconnecting the main relay in the battery management system. The damage caused by impulse current impact on electrical components in a high-voltage loop of the battery in the power battery power-on and power-off process of the new energy automobile is avoided.

An embodiment of the present invention provides an apparatus for powering up a power battery of a new energy vehicle, which is applied to a controller of a battery management system, as shown in fig. 7, and includes:

the first determining unit 701 is configured to receive a wake-up instruction sent by the vehicle controller, and determine whether the battery management system is normal.

The waiting unit 702 is configured to wait for the vehicle control unit to send a command for closing a main relay in the battery management system if the first determining unit 701 determines that the battery management system is normal.

And a closing unit 703 for closing the main relay in the battery management system if the waiting unit receives a command for closing the main relay in the battery management system sent by the vehicle control unit.

For the specific working process of the unit disclosed in the above embodiment of the present invention, reference may be made to the content of the corresponding method embodiment, as shown in fig. 2, which is not described herein again.

Optionally, in another embodiment of the present invention, an implementation manner of the first determining unit 701, as shown in fig. 8, includes:

the receiving unit 801 is configured to receive a wake-up instruction sent by the vehicle control unit.

The determining subunit 802 is configured to determine whether data collected in the battery management system is normal.

Wherein, the data of gathering in the battery management system include: the single voltage and temperature information of each daughter board in the battery management system and the insulation resistance value of the high-voltage acquisition board.

If the judging subunit 802 judges that the voltage of the single body of each daughter board in the battery management system is normal, the temperature information is normal, and the insulation group value of the high-voltage acquisition board is greater than the preset insulation resistance value, it indicates that the battery management system is normal.

If the determining subunit 802 determines that any one of the data collected in the battery management system is abnormal, it indicates that the battery management system is abnormal.

For the specific working process of the unit disclosed in the above embodiment of the present invention, reference may be made to the content of the corresponding method embodiment, which is not described herein again.

The embodiment of the present invention provides a power-off device for a power battery, which is applied to a controller of a battery management system, as shown in fig. 9, and includes:

the second determining unit 901 is configured to receive a power-off instruction sent by the vehicle controller, and determine whether a current value of the main circuit collected by the battery management system is normal.

A disconnecting unit 902, configured to disconnect a main relay in the battery management system if the second determining unit 901 determines that the current main circuit current value collected by the battery management system is normal.

For the specific working process of the unit disclosed in the above embodiment of the present invention, reference may be made to the content of the corresponding method embodiment, as shown in fig. 4, which is not described herein again.

According to the above technical scheme, the device for powering on and powering off the power battery of the new energy automobile, provided by the invention, is applied to the controller of the battery management system, and comprises: in the power-on process, the first determining unit 701 is configured to determine whether the battery management system is normal after receiving a wake-up instruction sent by the vehicle control unit; the waiting unit 702 is configured to wait for the vehicle control unit to send a command for closing a main relay in the battery management system if the first determining unit 701 determines that the battery management system is normal; the closing unit 703 is configured to close a main relay in the battery management system if a command for closing the main relay in the battery management system sent by the vehicle control unit is received; in the power-off process, the second judging unit 901 is configured to judge whether the current value of the main circuit collected by the battery management system is normal after receiving a power-off command sent by the vehicle control unit; the disconnection unit 902 is configured to disconnect a main relay in the battery management system if the second determination unit 901 determines that the current main circuit current value collected by the battery management system is normal. The damage caused by impulse current impact on electrical components in a high-voltage loop of the battery in the power battery power-on and power-off process of the new energy automobile is avoided.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.