CN109823285A - Electric system, power-on and power-off control method and control system above and below electric automobile high-voltage - Google Patents
Electric system, power-on and power-off control method and control system above and below electric automobile high-voltage Download PDFInfo
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- CN109823285A CN109823285A CN201711156735.3A CN201711156735A CN109823285A CN 109823285 A CN109823285 A CN 109823285A CN 201711156735 A CN201711156735 A CN 201711156735A CN 109823285 A CN109823285 A CN 109823285A
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Abstract
The present invention relates to electric system, power-on and power-off control method and control systems above and below electric automobile high-voltage, after receiving vehicle power on signal, in the case where preliminary filling contactor closure, if the voltage of total positive contactor and total negative contactor close to load one end is greater than the first setting value, total negative contactor adhesion fault is judged；After receiving vehicle power on signal, in the case where total negative contactor fault-free and total negative contactor closure, if the voltage of total positive contactor and total negative contactor close to load one end is greater than the second setting value, total positive contactor adhesion fault is judged.Therefore, in conjunction with total positive contactor and total negative contactor close to the voltage for loading one end, and by above-mentioned control process, it can accurately be diagnosed to be total positive contactor or whether total negative contactor adhesion fault occurs, and then guarantee that the reliable energy of power battery exports.
Description
Technical field
The present invention relates to electric system, power-on and power-off control method and control systems above and below electric automobile high-voltage, belong to electronic vapour
Vehicle high-pressure system control field.
Background technique
Ability output circuit of the power battery as electric car, energy export a series of on-off by high tension apparatus
It realizes, the working condition of high tension apparatus, especially power battery anode high-voltage relay (total positive contactor) and negative terminal high pressure
Whether normal on-off has exported highly important effect to the reliable energy of power battery to relay (total negative contactor), therefore,
The working condition of power battery high-voltage relay and other associated high voltage devices must be detected, it still, at present can not be reliably
Judge high-voltage relay whether failure, cause to be unable to complete high pressure powering on process, or complete high pressure and power on process, but without
The case where adhesion situation of method identification high-voltage relay, the irregular operating of these high-voltage relays is vehicle operation and maintenance band
Carry out insecurity factor.Moreover, electric automobile high-voltage power-on and power-off process, is controlled generally according to preset pre-charging time
Electricity, lower electricity are first to disconnect total positive contactor, are then turned off total negative contactor, not according to current detecting and discharge voltage detect into
The lower electricity of row.Also do not diagnosed the process powered on again first generally.
Summary of the invention
The object of the present invention is to provide electric system, power-on and power-off control method and control systems above and below electric automobile high-voltage, use
To realize the fault diagnosis of high tension apparatus.
To achieve the above object, the present invention includes following technical scheme.
System schema one: this programme provides a kind of electric automobile high-voltage electric system up and down, including power battery and driven
Power anode output positive output line road and from power battery cathode export negative output line road, positive output line road
String is equipped with total positive contactor, and one end for connecting power battery in total positive contactor is first end, in total positive contactor
One end for connecting load is second end, and negative output line road string is equipped with total negative contactor, is used in total negative contactor
The one end for connecting power battery is first end, and one end for connect load in total negative contactor is second end, it is described always just
Contactor is parallel with a preliminary filling branch, and preliminary filling branch road string is equipped with preliminary filling resistance and preliminary filling contactor, and the system is also
Including first voltage detection module and second voltage detection module, the first voltage detection module is for detecting total positive contactor
The voltage of first end and total negative contactor first end, the second voltage detection module for detect total positive contactor second end and
The voltage of total negative contactor second end.
There are two voltage detection modules for setting, and first voltage detection module is for detecting total positive contactor and total negative contactor
Voltage close to one end of power battery, second voltage detection module is for detecting total positive contactor and total negative contactor close to negative
The voltage of one end of load, according to contactor total positive in the voltage signal carry out system of the two voltage detection modules detection and total negative
The fault diagnosis of the important high tension apparatus such as contactor.
System schema two: on the basis of system schema one, system further includes control module, and the control module sampling connects
Connect the first voltage detection module and the second detection module, control connection total positive contactor, total negative contactor and preliminary filling
Contactor.
System schema three: on the basis of system schema two, the positive output line road or negative output line road are set
It is equipped with current detection module, the control module sampling connects the current detection module.
Control method scheme one: this programme provides one kind and is exclusively used in system schema one electric system above and below electric automobile high-voltage
Electric automobile high-voltage power-on and power-off control method,
After receiving vehicle power on signal, in the case where only preliminary filling contactor closure, if the second voltage detects
When the voltage that module detects is greater than the first setting value, total negative contactor adhesion fault is judged；
After receiving vehicle power on signal, in the disconnection of preliminary filling contactor, total negative contactor fault-free and only total bear is contacted
In the case that device is closed, if the voltage that the second voltage detection module detects is greater than the second setting value, judgement is always just being connect
Tentaculum adhesion fault.
After receiving vehicle power on signal, in the case where preliminary filling contactor closure, due to total negative contact under normal circumstances
Device should be at off-state, if the voltage that second voltage detection module detects at this time is greater than a setting value, indicate line
Road forms access, and total negative contactor is practically at closed state, then, judge total negative contactor adhesion fault；Moreover, same
Sample, after receiving vehicle power on signal, in the disconnection of preliminary filling contactor, total negative contactor fault-free and total negative contactor closure
Under the premise of, since total positive contactor should be at off-state under normal circumstances, if the electricity that second voltage detection module detects
Pressure is greater than a setting value, indicates that route forms access, and total positive contactor is practically at closed state, then, judgement is total just
Contactor adhesion fault.Therefore, in conjunction with first voltage detection module and the second detection module, and pass through above-mentioned control process, energy
It is enough accurately diagnosed to be total positive contactor or whether total negative contactor adhesion fault occurs, and then guarantee the reliable of power battery
Energy output.In addition, carrying out fault diagnosis, accurate judgement abort situation to total contactor before powering on.
Control method scheme two: on the basis of control method scheme one, after receiving vehicle power on signal, if vehicle is examined
It is disconnected to be then closed total negative contactor first without any failure, reclose preliminary filling contactor, preliminary filling is carried out to the pre-charging capacitor in load
Electricity controls closure and is always just contacting if the voltage that second voltage detection module detects allows to power on voltage value greater than setting
Device is then turned off preliminary filling contactor, electric control in completion.
Control method scheme three: on the basis of control method scheme two, if after setting time pre-charging capacitor voltage
Value allows to power on voltage value still less than setting, then high pressure is reported to power on preliminary filling failure.
Control method scheme four: on the basis of control method scheme one or two, in the case where receiving vehicle after electric signal, detection
Electric current on power battery outlet line, when electric current, which is less than setting, to descend electric current value, control disconnects total positive contactor, then
Pre-charging capacitor electric discharge in control load, when the voltage value in pre-charging capacitor, which is less than setting, can descend piezoelectric voltage value, control is disconnected
Total negative contactor completes lower electric control.
Lower electricity is carried out when current value, which is less than, to descend electric current value, contactor band is can avoid and carries lower electricity, be able to extend contact
The service life of device, also, when the voltage value in pre-charging capacitor, which is less than setting, can descend piezoelectric voltage value, it is discharged to pre-charging capacitor
Safe voltage carries out lower electricity, and the electric energy that vehicle can be made to have is in a safe condition.Therefore, the control method of above-mentioned power-on and power-off can
By reasonable, can effective protection Important Components, guarantee safe power-on and power-off.
Control method scheme five: it on the basis of control method scheme one, after receiving vehicle power on signal, first determines whether
The voltage that first voltage detection module detects is examined if the voltage that first voltage detection module detects is less than third setting value
Break and otherwise carries out total negative contactor adhesion fault for the fuse blows failure in power battery and total positive contactor is viscous
The even diagnosis of failure.
Control method scheme six: on the basis of control method scheme four, if the electricity after setting time in pre-charging capacitor
Pressure value can descend piezoelectric voltage value described in being still greater than, then still control the total negative contactor of disconnection, and report electric fault under high pressure.
Control system scheme one: this programme provides a kind of for electric automobile high-voltage power-on and power-off system in control system scheme one
The electric automobile high-voltage of system electric control system up and down, including memory, processor and storage in memory and can handled
The computer program run on device, the processor realize following strategy when executing described program:
After receiving vehicle power on signal, in the case where only preliminary filling contactor closure, if the second voltage detects
When the voltage that module detects is greater than the first setting value, total negative contactor adhesion fault is judged；
After receiving vehicle power on signal, in the disconnection of preliminary filling contactor, total negative contactor fault-free and only total bear is contacted
In the case that device is closed, if the voltage that the second voltage detection module detects is greater than the second setting value, judgement is always just being connect
Tentaculum adhesion fault.
Control system scheme two: on the basis of control system scheme one, after receiving vehicle power on signal, if vehicle is examined
It is disconnected to be then closed total negative contactor first without any failure, reclose preliminary filling contactor, preliminary filling is carried out to the pre-charging capacitor in load
Electricity controls closure and is always just contacting if the voltage that second voltage detection module detects allows to power on voltage value greater than setting
Device is then turned off preliminary filling contactor, electric control in completion.
Control system scheme three: on the basis of control system scheme two, if after setting time pre-charging capacitor voltage
Value allows to power on voltage value still less than setting, then high pressure is reported to power on preliminary filling failure.
Control system scheme four: on the basis of control system scheme one or two, in the case where receiving vehicle after electric signal, detection
Electric current on power battery outlet line, when electric current, which is less than setting, to descend electric current value, control disconnects total positive contactor, then
Pre-charging capacitor electric discharge in control load, when the voltage value in pre-charging capacitor, which is less than setting, can descend piezoelectric voltage value, control is disconnected
Total negative contactor completes lower electric control.
Control system scheme five: it on the basis of control system scheme one, after receiving vehicle power on signal, first determines whether
The voltage that first voltage detection module detects is examined if the voltage that first voltage detection module detects is less than third setting value
Break and otherwise carries out total negative contactor adhesion fault for the fuse blows failure in power battery and total positive contactor is viscous
The even diagnosis of failure.
Control system scheme six: on the basis of control system scheme four, if the electricity after setting time in pre-charging capacitor
Pressure value can descend piezoelectric voltage value described in being still greater than, then still control the total negative contactor of disconnection, and report electric fault under high pressure.
Detailed description of the invention
Fig. 1 is the hardware structure diagram of electric system above and below electric automobile high-voltage；
Fig. 2 is electric automobile high-voltage power-on and power-off control method flow diagram.
Specific embodiment
The present invention will be further described in detail with reference to the accompanying drawing.
As shown in Figure 1, electric system includes power battery 1 and exports from 1 anode of power battery electric automobile high-voltage up and down
Positive output line road and from the negative output line road that power battery cathode exports, in the present embodiment, power battery interior setting
There is the service switch 2 with fuse, service switch 2 is connected among power battery.Control is provided in the present embodiment, in system
System and detection unit 5 for the diagnosis and control of whole system are the control cores of system, and certainly, the control core of system is also
It can be the battery management system (BMS) in vehicle, in this case, which is not just a part of system.
String always is used to connect the one of power battery 1 positive output line equipped with total positive contactor 9 in positive contactor 9 on the road
End is first end, and one end for connect load in total positive contactor 9 is second end, from the point of view of the orientation provided with Fig. 1, first
End is the left-hand end of total positive contactor 9, and second end is the right-hand end of total positive contactor 9.Negative output line road string is equipped with total negative
Contactor 4, always one end for connecting power battery 1 in negative contactor 4 is first end, is used to connect in total negative contactor 4
One end of load is connect as second end, from the point of view of the orientation provided with Fig. 1, first end is the left-hand end of total negative contactor 4, and second end is
The right-hand end of total negative contactor 4.Total positive contactor 9 is parallel with a preliminary filling branch, and preliminary filling branch road string is equipped with preliminary filling resistance 10
With preliminary filling contactor 8.
Since the basic load of power battery 1 is motor, then, in the present embodiment, the load of power battery 1 is motor control
Device 6 processed has filter capacitor, also referred to as pre-charging capacitor in electric machine controller 6, and preliminary filling branch can be to pre- in electric machine controller 6
Charging, which is held, carries out preliminary filling.In the present embodiment, string is equipped with molten on the route between total positive contactor 9 and the anode of electric machine controller 6
Disconnected device 7.
Control and the total positive contactor 9 of the control connection of detection unit 5, total negative contactor 4 and preliminary filling contactor 8, pass through control
Signal controls the state of these three contactors.In the present embodiment, total positive contactor 9, total negative contactor 4 and preliminary filling contactor 8 are equal
It is contact and control coil respectively including two parts, then, the contact string of total positive contactor 9 is located at positive output line road, always
The contact string of negative contactor 4 is located at negative output line road, and the contact string of preliminary filling contactor 8 is located at preliminary filling branch road, control and
The control coil of the total positive contactor 9 of the control connection of detection unit 5, total negative contactor 4 and preliminary filling contactor 8, as shown in Figure 1.
System further includes first voltage detection module and second voltage detection module, and first voltage detection module is for detecting
The voltage of the left-hand end of the left-hand end and total negative contactor 4 of total positive contactor 9, the i.e. total positive contactor 9 of detection and total negative contactor 4
Voltage close to 1 this one end of power battery, is known as stagnation pressure 1 for the detection signal of first voltage detection module；Second voltage detection
Module is used to detect the voltage of the right-hand end of total positive contactor 9 and the right-hand end of total negative contactor 4, the i.e. total positive contactor 9 of detection
With total negative contactor 4 close to the voltage of 6 this one end of electric machine controller, the detection signal of second voltage detection module is known as stagnation pressure
2.It so, is 1 negative signal of 1 positive signal of stagnation pressure and stagnation pressure respectively there are two the signals of first voltage detection module detection, the
There are two the signals of two voltage detection modules detection, is 2 negative signal of 2 positive signal of stagnation pressure and stagnation pressure respectively.First voltage inspection
It surveys module and second voltage detection module is not shown in Fig. 1, be only indicated with detecting route, and due to voltage detecting
Module belongs to existing equipment, just no longer illustrates here.Control and detection unit 5 sampling connection first voltage detection module and
Second voltage detection module, for receiving the voltage signal of the two voltage detection modules detection.In addition, control and detection unit
5 are also connected by connection with electric machine controller 6.
Further, it is additionally provided with current detection module 3 in system, for detecting the output electric current of power battery 1, is arranged
On positive output line road or negative output line road, the present embodiment is disposed at negative output line road, control and detection
Unit 5 passes through current detecting line sampling connection current detection module 3.
When vehicle is without catastrophe failure, control and after detection unit 5 receives vehicle power on signal detects first first
The voltage signal that voltage detection module detects, i.e. 1 signal of stagnation pressure, if stagnation pressure 1 is less than setting value (in order to shine with claims
Answer, setting value at this time is third setting value), the diagnosable fuse blows failure in service switch 2 (certainly, open by maintenance
The fuse blows failure diagnostic process closed in 2 can be omitted, and directly carries out subsequent total negative contactor adhesion fault and is always just connecing
The diagnosis of tentaculum adhesion fault)；If detecting, stagnation pressure 1 in vehicle high pressure range of normal value, carries out adhesion to main contactor and examines
It is disconnected: the 1. adhesion diagnostic method of total negative contactor are as follows: to be first closed preliminary filling contactor, i.e., the case where only preliminary filling contactor is closed
Under, if detecting the voltage signal that second voltage detection module detects, i.e., stagnation pressure 2 is greater than a setting value (in order to want with right
Ask book to correlate, setting value at this time is the first setting value), then be diagnosed as total negative contactor adhesion fault, reporting fault, terminate on
Electric current journey；If can't detect stagnation pressure 2, total negative contactor fault-free, then, the adhesion diagnosis of total positive contactor is carried out, therefore,
2. the adhesion diagnostic method of total positive contactor are as follows: control disconnects preliminary filling contactor, is then closed total negative contactor, i.e., connects in preliminary filling
Tentaculum disconnects, in the case where total negative contactor fault-free and only total negative contactor closure, if detecting, stagnation pressure 2 is greater than one and sets
Definite value (in order to correlate with claims, setting value at this time is the second setting value), then be diagnosed as total positive contactor adhesion event
Barrier, if can't detect stagnation pressure 2, total positive contactor fault-free, control disconnects total negative contactor.Therefore, any failure is detected,
Setting error code is reported, vehicle, which not can enter, normally powers on process.
If after control and detection unit 5 receive vehicle power on signal, vehicle power-up diagnostics then enter normal without any failure
Power on process, be closed total negative contactor first, time-out time is set, if in the time-out time stagnation pressure 1 whether normal and vehicle
Whether the diagnosis without catastrophe failure is not completed, and indicates self-test time time-out, then electric fault in high pressure is reported (certainly, should
Process of self-test is specific embodiment, it is convenient to omit), preliminary filling contactor is closed if self-test normally, i.e., first total bear of closure connects
After tentaculum recloses preliminary filling contactor, the pre-charging capacitor in electric machine controller is pre-charged, and detects the voltage of stagnation pressure 2
Value controls the total positive contactor of closure, is then turned off preliminary filling if the voltage value of stagnation pressure 2 allows to power on voltage value greater than setting
Contactor completes electrifying timing sequence control.Since stagnation pressure 2 is the voltage close to electric machine controller side, the voltage of stagnation pressure 2
Value can be understood as the voltage value of pre-charging capacitor, set a time, if the voltage value of pre-charging capacitor is still small after the setting time
Allow to power on voltage value in setting, then high pressure is reported to power on preliminary filling failure.
Control and detection unit receive under vehicle after electric signal, and current detection module detects route current value, work as current value
Less than setting when descending electric current value, control disconnects total positive contactor, then issues electric machine controller actively by connection
Electric discharge instruction controls pre-charging capacitor electric discharge in electric machine controller, then detects stagnation pressure 2, and the voltage in pre-charging capacitor gradually decreases,
When the voltage value in pre-charging capacitor, which is less than setting, can descend piezoelectric voltage value, control disconnects total negative contactor, completes lower electric control.If
The fixed time, if the voltage value after the setting time in pre-charging capacitor, which is still greater than, can descend piezoelectric voltage value, it may also be said to, time-out
Voltage value, which is still greater than, can descend piezoelectric voltage value, then still off total negative contactor, but report electric fault under high pressure.Therefore, in current value
Lower electricity is carried out less than when can descend electric current value, contactor band is can avoid and carries lower electricity, be able to extend the service life of contactor, and
And detection stagnation pressure 2 is less than setting and is controlled when can descend piezoelectric voltage value, the electric energy that vehicle can be made to have is in a safe condition.Fig. 2
For the overall flow figure of electric automobile high-voltage power-on and power-off control method, also, each setting value in the present embodiment can basis
Actual needs is set.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.Base of the invention
This thinking is above-mentioned basic scheme, and for those of ordinary skill in the art, various changes are designed in introduction according to the present invention
The model of shape, formula, parameter do not need to spend creative work.It is right without departing from the principles and spirit of the present invention
The change, modification, replacement and modification that embodiment carries out are still fallen in protection scope of the present invention.
The above method can be used as a kind of computer program, be stored in depositing in electric automobile high-voltage or more electric control system
It can run in reservoir and on the processor above and below electric automobile high-voltage in electric control system.
Claims (10)
1. a kind of electric automobile high-voltage electric system up and down, which is characterized in that defeated including power battery and from power battery anode
Positive output line road out and from the negative output line road that power battery cathode exports, positive output line road string, which is equipped with, always just to be connect
Tentaculum, always one end for being used to connect power battery in positive contactor is first end, loading in total just contactor for connection
One end be second end, negative output line road string is equipped with total negative contactor, in total negative contactor for connecting power battery
One end be first end, one end for connect load in total negative contactor is second end, and total just contactor is parallel with
One preliminary filling branch, preliminary filling branch road string are equipped with preliminary filling resistance and preliminary filling contactor, and the system also includes first voltages
Detection module and second voltage detection module, the first voltage detection module are used to detect total positive contactor first end and always bear
The voltage of contactor first end, the second voltage detection module is for detecting total positive contactor second end and total negative contactor the
The voltage at two ends.
2. electric system above and below electric automobile high-voltage according to claim 1, which is characterized in that system further includes control mould
Block, the control module sampling connect the first voltage detection module and the second detection module, and control connection is described always just to be connect
Tentaculum, total negative contactor and preliminary filling contactor.
3. a kind of electric automobile high-voltage power-on and power-off controlling party for being exclusively used in electric automobile high-voltage described in claim 1 or more electric system
Method, which is characterized in that
After receiving vehicle power on signal, in the case where only preliminary filling contactor closure, if the second voltage detection module
When the voltage detected is greater than the first setting value, total negative contactor adhesion fault is judged；
After receiving vehicle power on signal, closed in the disconnection of preliminary filling contactor, total negative contactor fault-free and only total negative contactor
In the case where conjunction, if the voltage that the second voltage detection module detects is greater than the second setting value, total positive contactor is judged
Adhesion fault.
4. electric automobile high-voltage power-on and power-off control method according to claim 3, which is characterized in that powered on receiving vehicle
After signal, if vehicle diagnostics without any failure, are closed total negative contactor first, preliminary filling contactor are reclosed, in load
Pre-charging capacitor is pre-charged, if the voltage that second voltage detection module detects allows to power on voltage value greater than setting,
Control is closed total positive contactor, is then turned off preliminary filling contactor, electric control in completion.
5. electric automobile high-voltage power-on and power-off control method according to claim 4, which is characterized in that if after setting time
The voltage value of pre-charging capacitor allows to power on voltage value still less than setting, then high pressure is reported to power on preliminary filling failure.
6. electric automobile high-voltage power-on and power-off control method according to claim 3 or 4, which is characterized in that receiving vehicle
After lower electric signal, the electric current on power battery outlet line is detected, when electric current, which is less than setting, to descend electric current value, control is disconnected
Then total positive contactor controls the pre-charging capacitor electric discharge in load, can descend electricity electricity when the voltage value in pre-charging capacitor is less than setting
When pressure value, control disconnects total negative contactor, completes lower electric control.
7. electric control above and below a kind of electric automobile high-voltage for controlling electric automobile high-voltage described in claim 1 or more electric system
System including memory, processor and stores the computer program that can be run in memory and on a processor, feature
It is, the processor realizes following strategy when executing described program:
After receiving vehicle power on signal, in the case where only preliminary filling contactor closure, if the second voltage detection module
When the voltage detected is greater than the first setting value, total negative contactor adhesion fault is judged；
After receiving vehicle power on signal, closed in the disconnection of preliminary filling contactor, total negative contactor fault-free and only total negative contactor
In the case where conjunction, if the voltage that the second voltage detection module detects is greater than the second setting value, total positive contactor is judged
Adhesion fault.
8. electric control system above and below electric automobile high-voltage according to claim 7, which is characterized in that powered on receiving vehicle
After signal, if vehicle diagnostics without any failure, are closed total negative contactor first, preliminary filling contactor are reclosed, in load
Pre-charging capacitor is pre-charged, if the voltage that second voltage detection module detects allows to power on voltage value greater than setting,
Control is closed total positive contactor, is then turned off preliminary filling contactor, electric control in completion.
9. electric control system above and below electric automobile high-voltage according to claim 8, which is characterized in that if after setting time
The voltage value of pre-charging capacitor allows to power on voltage value still less than setting, then high pressure is reported to power on preliminary filling failure.
10. electric control system above and below electric automobile high-voltage according to claim 7 or 8, which is characterized in that receiving vehicle
After lower electric signal, the electric current on power battery outlet line is detected, when electric current, which is less than setting, to descend electric current value, control is disconnected
Then total positive contactor controls the pre-charging capacitor electric discharge in load, can descend electricity electricity when the voltage value in pre-charging capacitor is less than setting
When pressure value, control disconnects total negative contactor, completes lower electric control.
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| CN111434508A (en) * | 2019-11-29 | 2020-07-21 | 蜂巢能源科技有限公司 | Control circuit of contactor, power supply system and electric vehicle |
| CN111532133A (en) * | 2019-08-20 | 2020-08-14 | 长城汽车股份有限公司 | Automobile direct-current bus pre-charging method and equipment |
| CN111746283A (en) * | 2020-06-12 | 2020-10-09 | 浙江飞碟汽车制造有限公司 | Electric automobile contactor adhesion detection method |
| CN112297845A (en) * | 2019-07-31 | 2021-02-02 | 比亚迪股份有限公司 | Power supply control system and method and vehicle |
| CN113071315A (en) * | 2021-03-10 | 2021-07-06 | 重庆长安汽车股份有限公司 | Method and system for detecting connection integrity of high-voltage electrical system of electric automobile |
| CN113500939A (en) * | 2021-07-05 | 2021-10-15 | 华人运通(江苏)技术有限公司 | Method, device and equipment for monitoring state of charging contactor of vehicle |
| CN113665362A (en) * | 2021-08-17 | 2021-11-19 | 东风汽车股份有限公司 | Control method of power-on and power-off control system of pure electric vehicle |
| CN113690952A (en) * | 2020-05-15 | 2021-11-23 | 比亚迪股份有限公司 | Voltage transmission control circuit and vehicle |
| CN113937408A (en) * | 2020-06-30 | 2022-01-14 | 蓝谷智慧(北京)能源科技有限公司 | Energy storage device, energy storage control method and device applying energy storage device and equipment |
| CN114325502A (en) * | 2021-11-30 | 2022-04-12 | 章鱼博士智能技术(上海)有限公司 | Method and device for diagnosing pre-charging circuit and power battery system |
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