CN107599847A - High-voltage discharge system - Google Patents
High-voltage discharge system Download PDFInfo
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- CN107599847A CN107599847A CN201710889504.7A CN201710889504A CN107599847A CN 107599847 A CN107599847 A CN 107599847A CN 201710889504 A CN201710889504 A CN 201710889504A CN 107599847 A CN107599847 A CN 107599847A
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- module
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- discharge
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- 238000006243 chemical reaction Methods 0.000 claims description 47
- 230000005611 electricity Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 208000021760 high fever Diseases 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention creatively designs the high-voltage discharge system which is provided with a redundant active discharge route and a passive discharge route, thereby improving the safety, reliability and robustness of the product.
Description
Technical field
The invention is related to new-energy automobile electronic control technology field, and specifically a kind of height based on security purpose presses
Electric system.
Background technology
It is battery, motor, automatically controlled（Also referred to as " three electricity "）It is the core technology of electronic new-energy automobile, power control unit
It is one of key technology point in electronic control technology again.
Usually, electric capacity can be set in power control unit as important energy-storage function part, during real work, electric capacity
The voltage at both ends is often very high（≥300V）, such as parking working condition or in the case of some failures, it is necessary to right
Electric capacity is discharged, and its voltage is down to claimed range（60V or normal working voltage require voltage etc.）.
For example, Chinese publication, CN104935219A, there is provided
According to ISO26262 road vehicle functional safety related requests, if electric capacity electric discharge is broken down, it is necessary to design redundancy road
Line is with guarantee personnel's property safety of trying one's best.
Innovation and creation content
When vehicle needs to carry out electrion, if failure be present in electric discharge route, and if the route sheet one that discharges, easily
Cause abnormal high pressure high fever, bring infringement to vehicle arrangement, or even influence the personal safety of occupant.
The invention is for the deficiency present in electrion system in the prior art, is required according to ISO26262,
Around security, reliability and the robustness of lifting product, a kind of electrion system is designed, the electrion system has simultaneously
Standby active discharge and passive discharge capability, and have multichannel electric discharge route.
Technical scheme：
Electrion system, including control module, electric capacity, power driver module, passive discharge module and DC conversion modules.
The main function of electric capacity is energy storage, and in normal work, its both end voltage is likely to be breached hundreds of volts.
Power driver module, and electric capacity are connected in parallel, and can be IGBT module, in order to realize optimal control, IGBT module
On be typically provided driving plate, the order of driving plate receive and control module, and being controlled according to order to IGBT module is described
IGBT module DC high-voltage can be converted to needed for the alternating current of voltage x current more optimize, described IGBT module is
Automotive grade IGBT module, power driver module are one of active discharge paths, and described active discharge refers to that associated components are being controlled
Under the order of molding block, the process actively discharged electric capacity.
Passive discharge module, can be discharge resistance, and electric capacity is connected in parallel, for supporting passively to discharge, i.e., predetermined
Operating mode or under the conditions of, voluntarily assist electric capacity discharged.
DC conversion modules, and electric capacity are connected in parallel, and the direct current of high pressure can be converted to the symbol such as 12V or 24V
Desired low-voltage DC is closed, is one of active discharge path.
Control module is used to be controlled active discharge, can be the control module that power control unit carries, such as
Control panel or entire car controller, control module connect with power driver module and DC conversion modules signal respectively,
And power driver module and DC conversion modules are controlled to perform active discharge function.
Power driver module is connected with external communication electrical equipment, and described external communication electrical equipment can be three-phase
AC driven motor, Oil pump electrical machinery or other AC electric equipments, under active discharge state, power driver module leads electric current
Enter external communication electrical equipment, so as to realize active discharge.
DC conversion modules are connected with external dc electrical equipment, and described external dc direct-flow electricity utilization apparatus can be
12V either vehicle electronic devices of 24V or other magnitudes of voltage, under active discharge state, DC conversion modules induce current into
External dc electrical equipment, so as to realize active discharge.
A kind of high-voltage discharge method, realized based on above-mentioned electrion system, specifically included：
Electric capacity is passively discharged using passive discharge module；
Control module controls power driver module, and active discharge is carried out to electric capacity using power driver module；
Control module controls DC conversion modules, and active discharge is carried out to electric capacity using DC conversion modules.
Beneficial effect：
The design of the invention, it is ensured that when needing to carry out electrion, even if failure be present in some electric discharge route,
Electric discharge is not influenceed to be normally carried out, improves the reliability of vehicle, so as to ensure that the safety of occupant and vehicle.
Meanwhile each functional module separately has work purposes in itself in the invention, extra cost burden can't be brought.
Brief description of the drawings
Fig. 1 be the invention electrion system in each part electrical connection schematic diagram.
Fig. 2 be the invention electrion system in each part a kind of control route schematic diagram.
Fig. 3 be the invention electrion system in each part another control route（It is different with Fig. 2 routes）
Schematic diagram.
Fig. 4 is that the electrion system of the invention is passively discharged schematic diagram.
Fig. 5 is that the electrion system of the invention carries out the schematic diagram of active discharge using power driver module.
Fig. 6 is that the electrion system of the invention carries out active discharge one kind using DC conversion modules（Corresponding diagram 3
Control route）Schematic diagram.
Fig. 7 is that the electrion system of the invention carries out active discharge one kind using DC conversion modules（Corresponding diagram 2
Control route）Schematic diagram.
Embodiment
In order to preferably be illustrated to the technical scheme of the invention, the invention will be entered by following examples
Row description：
Special instruction, in order that specific embodiment is succinct, clear, carry out following set：
1st, the control panel in specific embodiment, that is, the control module that power control unit carries is referred to, due to the general control module
It is to be made up of printed circuit board and the electronic component being arranged above, major function is controlled according to pre-provisioning request, because
This abbreviation control panel.
2nd, the first power model in specific embodiment, the second power model are power driver module, the master of the module
It is that electric current is modulated using the characteristic of semiconductor to act on, so as to obtain the electric current of corresponding requirements.
Specific embodiment one：
As shown in figure 1, electrion system, including passive discharge module, electric capacity, the first power model, the second power model,
12V DC modular converter and 24V DC conversion modules.
Described passive discharge module, electric capacity, the first power model, the second power model, 12V DC modular converter and
It is electrical connection in parallel between 24V DC conversion modules；Passive discharge module, electric capacity, the first power model, the second power model,
12V DC modular converter and 24V DC conversion modules are electrically connected in series with direct-flow input end mouth respectively.
First power driver module is electrically connected by the first ac output end mouth and motor.
Second power driver module is electrically connected by the second ac output end mouth and Oil pump electrical machinery.
12V DC modular converter and the electrical connection of 12V vehicle electronic devices.
24V DC conversion modules and 24V vehicle electronic devices（Including battery）Electrical connection.
As shown in Fig. 2 electrion system also includes control module, described control module includes entire car controller and control
Making sheet.
Power control unit possesses certain autonomous control authority, and receives the control of entire car controller.
Power control unit can receive the signal of the sensor on direct-flow input end mouth, and the first power can be driven
Dynamic model block and the second power driver module are controlled.
Entire car controller is except can be to power control unit（Realized by power control unit control panel）It is controlled
And receive outside its signal feedback, 12V DC modular converter and 24V DC conversion modules can also be controlled.
As shown in figure 4, passive discharge module is discharge resistance, and electric capacity is connected in parallel, when vehicle stops, vehicle power is sent out
Situations such as raw failure, direct-flow input end mouth stop to receive electric energy, high input voltage disconnects, if vehicle in front in normal work, that
According to formula：
E=½CV2；
Storage has a large amount of electric energy in electric capacity, and electric capacity both end voltage is higher, now, because electrical potential difference be present in electric capacity both ends, then electric capacity
Loop is formed with discharge resistance, after electric current is by discharge resistance, electric energy is converted into heat energy and discharged, under the voltage at electric capacity both ends
Drop.
According to the design of this specific embodiment, it is necessary in the case of, can by the voltage at electric capacity both ends within the 1s times,
It is reduced to below 60V.
As shown in figure 5, power driver module is made up of IGBT module and driving plate, with reference to shown in Fig. 1, work as entire car controller
Or the control panel on power control unit starts active discharge program, by control panel point when thinking to need to carry out active discharge
Do not control driving plate, two driving plates each control corresponding to IGBT module, produce two active discharge routes：
First active discharge route, the electric current in electric capacity are modulated by IGBT module, IGBT module to electric current, and it is unnecessary to make
Electric energy thermal energy consumption be converted into motor fall, so as to realize the electric discharge in the case of normal motor control is not influenceed.
Article 2 active discharge route, it is by Oil pump electrical machinery, its basic ideas is identical with first active discharge route.
According to the design of this specific embodiment, it is necessary in the case of, can by the voltage at electric capacity both ends within the 1s times,
It is reduced to below 60V.
As shown in fig. 7, perform active discharge program by entire car controller, entire car controller to 12V DC modular converter or
24V DC conversion modules assign instruction, and DC conversion modules will carry out both sides processing to electric energy according to order：
Vehicular accumulator cell is charged, i.e., stored electric energy in case reusing again；
Electricity consumption release is carried out by vehicle electronic device.
According to the design of this specific embodiment, it is necessary in the case of, can by the voltage at electric capacity both ends within the 1s times,
It is reduced to below 60V.
Specific embodiment two：
As shown in figure 1, electrion system, including passive discharge module, electric capacity, the first power model, the second power model,
12V DC modular converter and 24V DC conversion modules.
Described passive discharge module, electric capacity, the first power model, the second power model, 12V DC modular converter and
It is electrical connection in parallel between 24V DC conversion modules；Passive discharge module, electric capacity, the first power model, the second power model,
12V DC modular converter and 24V DC conversion modules are electrically connected in series with direct-flow input end mouth respectively.
First power driver module is electrically connected by the first ac output end mouth and motor.
Second power driver module is electrically connected by the second ac output end mouth and Oil pump electrical machinery.
12V DC modular converter and the electrical connection of 12V vehicle electronic devices.
24V DC conversion modules and 24V vehicle electronic devices（Including battery）Electrical connection.
As shown in figure 3, electrion system also includes control module, described control module includes control panel, whole in addition
Management maincenter of the vehicle controller as vehicle, can be checked the working condition of control panel or directly be ordered when necessary
Order.
Power control unit possesses certain autonomous control authority, there is information interchange between entire car controller.
Power control unit can receive the signal of the sensor on direct-flow input end mouth, and the first power can be driven
Dynamic model block, the second power driver module, 12V DC modular converter and 24V DC conversion modules are controlled.
As shown in figure 4, passive discharge module is discharge resistance, and electric capacity is connected in parallel, when vehicle stops, vehicle power is sent out
Situations such as raw failure, direct-flow input end mouth stop to receive electric energy, high input voltage disconnects, if vehicle in front in normal work, that
According to formula：
E=½CV2；
Storage has a large amount of electric energy in electric capacity, and electric capacity both end voltage is higher, now, because electrical potential difference be present in electric capacity both ends, then electric capacity
Loop is formed with discharge resistance, after electric current is by discharge resistance, electric energy is converted into heat energy and discharged, under the voltage at electric capacity both ends
Drop.
According to the design of this specific embodiment, it is necessary in the case of, can by the voltage at electric capacity both ends within the 1s times,
It is reduced to below 60V.
As shown in figure 5, power driver module is made up of IGBT module and driving plate, with reference to shown in Fig. 1, when control panel is thought
When needing to carry out active discharge, start active discharge program, driving plate is controlled by control panel respectively, two driving plates each control
Corresponding IGBT module, produce two active discharge routes：
First active discharge route, the electric current in electric capacity are modulated by IGBT module, IGBT module to electric current, and it is unnecessary to make
Electric energy thermal energy consumption be converted into motor fall, so as to realize the electric discharge in the case of normal motor control is not influenceed.
Article 2 active discharge route, it is by Oil pump electrical machinery, its basic ideas is identical with first active discharge route.
According to the design of this specific embodiment, it is necessary in the case of, can by the voltage at electric capacity both ends within the 1s times,
It is reduced to below 60V.
As shown in fig. 6, when control panel thinks to need to carry out active discharge, start active discharge program, control panel is to 12V
DC conversion modules or 24V DC conversion modules assign instruction, and DC conversion modules will carry out two aspects to electric energy according to order
Processing：
Vehicular accumulator cell is charged, i.e., stored electric energy in case reusing again；
Electricity consumption release is carried out by vehicle electronic device.
According to the design of this specific embodiment, it is necessary in the case of, can by the voltage at electric capacity both ends within the 1s times,
It is reduced to below 60V.
Specific embodiment three：
Electrion system, including passive discharge module, electric capacity, the first power model, the second power model and direct current modulus of conversion
Block.
Described passive discharge module, between electric capacity, the first power model, the second power model and DC conversion modules
Electrically connected for parallel connection；Passive discharge module, electric capacity, the first power model, the second power model and DC conversion modules difference
It is electrically connected in series with direct-flow input end mouth.
First power driver module is electrically connected by the first ac output end mouth and motor.
Second power driver module is electrically connected by the second ac output end mouth and Oil pump electrical machinery.
DC conversion modules and vehicle electronic device（Including battery）Electrical connection.
Electrion system also includes control module, and described control module includes control panel, and entire car controller is made in addition
For the management maincenter of vehicle, the working condition of control panel can be checked when necessary or direct command.
Power control unit possesses certain autonomous control authority, there is information interchange between entire car controller.
Power control unit can receive the signal of the sensor on direct-flow input end mouth, and the first power can be driven
Dynamic model block, the second power driver module and DC conversion modules are controlled.
Passive discharge module be discharge resistance, and electric capacity is connected in parallel, when vehicle stopping, vehicle power break down, directly
Flow input port stop receive electric energy situations such as, high input voltage disconnect, if vehicle in front in normal work, then according to public affairs
Formula：
E=½CV2；
Storage has a large amount of electric energy in electric capacity, and electric capacity both end voltage is higher, now, because electrical potential difference be present in electric capacity both ends, then electric capacity
Loop is formed with discharge resistance, after electric current is by discharge resistance, electric energy is converted into heat energy and discharged, under the voltage at electric capacity both ends
Drop.
According to the design of this specific embodiment, it is necessary in the case of, can by the voltage at electric capacity both ends within the 1s times,
It is reduced to below 60V.
Power driver module is made up of IGBT module and driving plate, when control panel thinks to need to carry out active discharge, is opened
Dynamic active discharge program, driving plate is controlled by control panel respectively, two driving plates each control corresponding to IGBT module, generation two
Bar active discharge route：
First active discharge route, the electric current in electric capacity are modulated by IGBT module, IGBT module to electric current, and it is unnecessary to make
Electric energy thermal energy consumption be converted into motor fall, so as to realize the electric discharge in the case of normal motor control is not influenceed.
Article 2 active discharge route, it is by Oil pump electrical machinery, its basic ideas is identical with first active discharge route.
According to the design of this specific embodiment, it is necessary in the case of, can by the voltage at electric capacity both ends within the 1s times,
It is reduced to below 60V.
When control panel thinks to need to carry out active discharge, start active discharge program, control panel is to DC conversion modules
Instruction is assigned, DC conversion modules will carry out both sides processing to electric energy according to order：
Vehicular accumulator cell is charged, i.e., stored electric energy in case reusing again；
Electricity consumption release is carried out by vehicle electronic device.
According to the design of this specific embodiment, it is necessary in the case of, can by the voltage at electric capacity both ends within the 1s times,
It is reduced to below 60V.
Specific embodiment four：
Electrion system, including passive discharge module, electric capacity, power driver module and DC conversion modules.
Described passive discharge module, it is electrical connection in parallel between electric capacity, power driver module and DC conversion modules；
Passive discharge module, electric capacity, power driver module and DC conversion modules are electrically connected in series with direct-flow input end mouth respectively.
Power driver module is electrically connected by ac output end mouth and motor.
DC conversion modules and vehicle electronic device（Including battery）Electrical connection.
Electrion system also includes control module, and described control module includes control panel, and entire car controller is made in addition
For the management maincenter of vehicle, the working condition of control panel can be checked when necessary or direct command.
Power control unit possesses certain autonomous control authority, there is information interchange between entire car controller.
Power control unit can receive the signal of the sensor on direct-flow input end mouth, can be to power drive mould
Block and DC conversion modules are controlled.
Passive discharge module be discharge resistance, and electric capacity is connected in parallel, when vehicle stopping, vehicle power break down, directly
Flow input port stop receive electric energy situations such as, high input voltage disconnect, if vehicle in front in normal work, then according to public affairs
Formula：
E=½CV2；
Storage has a large amount of electric energy in electric capacity, and electric capacity both end voltage is higher, now, because electrical potential difference be present in electric capacity both ends, then electric capacity
Loop is formed with discharge resistance, after electric current is by discharge resistance, electric energy is converted into heat energy and discharged, under the voltage at electric capacity both ends
Drop.
According to the design of this specific embodiment, it is necessary in the case of, can by the voltage at electric capacity both ends within the 1s times,
It is reduced to below 60V.
Power driver module is made up of IGBT module and driving plate, when control panel thinks to need to carry out active discharge, is opened
Dynamic active discharge program, driving plate, driving plate control IGBT module, so, when the electric current in electric capacity passes through are controlled by control panel
During IGBT module, IGBT module is modulated to electric current, unnecessary electric energy is converted into thermal energy consumption in motor and is fallen, from
And realize the electric discharge in the case of normal motor control is not influenceed.
According to the design of this specific embodiment, it is necessary in the case of, can by the voltage at electric capacity both ends within the 1s times,
It is reduced to below 60V.
When control panel thinks to need to carry out active discharge, start active discharge program, control panel is to DC conversion modules
Instruction is assigned, DC conversion modules will carry out both sides processing to electric energy according to order：
Vehicular accumulator cell is charged, i.e., stored electric energy in case reusing again；
Electricity consumption release is carried out by vehicle electronic device.
According to the design of this specific embodiment, it is necessary in the case of, can by the voltage at electric capacity both ends within the 1s times,
It is reduced to below 60V.
Technical scheme provided by the present invention is described in detail above, for those of ordinary skill in the art,
According to the thought of the present embodiment, there will be changes in specific embodiments and applications, in summary, this specification
Content should not be construed as limiting the invention, and all any changes made according to the invention design philosophy are all the present invention's
Within protection domain.
Claims (10)
1. a kind of electrion system, including electric capacity, it is characterised in that：Also include control module, electric capacity, power driver module,
Passive discharge module and DC conversion modules；
Described power driver module, passive discharge module and DC conversion modules are connected in parallel with electric capacity respectively；
Described control module connects with control power driver module and DC conversion modules signal respectively.
2. electrion system according to claim 1, it is characterised in that：Described control module includes Power Control list
The control panel of member, the control panel of described power control unit connect with power driver module signal.
3. electrion system according to claim 1, it is characterised in that：Described power driver module includes IGBT moulds
Block and driving plate, described IGBT module connect with driving partitioned signal, and driving plate connects with control module signal.
4. electrion system according to claim 1, it is characterised in that：Described passive discharge module includes electric discharge electricity
Resistance.
5. electrion system according to claim 1, it is characterised in that：The output voltage of described DC conversion modules
For 12V.
6. electrion system according to claim 1, it is characterised in that：The output voltage of described DC conversion modules
For 24V.
7. electrion system according to claim 1, it is characterised in that：Power driver module and AC electric equipment phase
Connection.
8. electrion system according to claim 2, it is characterised in that：Described control module includes full-vehicle control
The control partitioned signal of device, described entire car controller and power control unit connects.
9. according to the electrion system described in claim 1,5 or 6, it is characterised in that：Described DC conversion modules and outer
Portion's direct-flow electricity utilization apparatus are connected.
10. the high-voltage discharge method that the electrion system in a kind of 1-9 using claim described in any one is realized, its
It is characterised by：Comprise the following steps
Electric capacity is passively discharged using passive discharge module；
Control module controls power driver module, and active discharge is carried out to electric capacity using power driver module；
Control module controls DC conversion modules, and active discharge is carried out to electric capacity using DC conversion modules.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710889504.7A CN107599847A (en) | 2017-09-27 | 2017-09-27 | High-voltage discharge system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710889504.7A CN107599847A (en) | 2017-09-27 | 2017-09-27 | High-voltage discharge system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107599847A true CN107599847A (en) | 2018-01-19 |
Family
ID=61058820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710889504.7A Pending CN107599847A (en) | 2017-09-27 | 2017-09-27 | High-voltage discharge system |
Country Status (1)
| Country | Link |
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| CN (1) | CN107599847A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109484186A (en) * | 2018-12-25 | 2019-03-19 | 华人运通控股有限公司 | Electric car active charging method and device |
| CN110492459A (en) * | 2018-05-15 | 2019-11-22 | 广州小鹏汽车科技有限公司 | A kind of high-voltage discharge method, device and motor |
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| CN102923013A (en) * | 2012-11-01 | 2013-02-13 | 重庆长安汽车股份有限公司 | Discharge control method and system for new energy automobile |
| CN104553809A (en) * | 2013-10-24 | 2015-04-29 | 联合汽车电子有限公司 | Trailer protection system for hybrid power and pure electric automobile |
| CN104626995A (en) * | 2013-11-06 | 2015-05-20 | 联合汽车电子有限公司 | High-voltage discharge system of electric vehicle |
| CN104638966A (en) * | 2013-11-06 | 2015-05-20 | 联合汽车电子有限公司 | Active discharge control system for electric car inverter and controller |
| KR20160134206A (en) * | 2015-05-15 | 2016-11-23 | 현대자동차주식회사 | Active capacitor discharge system of electric power system for eco-friendly vehicle |
| CN208035959U (en) * | 2017-09-27 | 2018-11-02 | 安捷励电控技术南京有限公司 | Electrion system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102923013A (en) * | 2012-11-01 | 2013-02-13 | 重庆长安汽车股份有限公司 | Discharge control method and system for new energy automobile |
| CN104553809A (en) * | 2013-10-24 | 2015-04-29 | 联合汽车电子有限公司 | Trailer protection system for hybrid power and pure electric automobile |
| CN104626995A (en) * | 2013-11-06 | 2015-05-20 | 联合汽车电子有限公司 | High-voltage discharge system of electric vehicle |
| CN104638966A (en) * | 2013-11-06 | 2015-05-20 | 联合汽车电子有限公司 | Active discharge control system for electric car inverter and controller |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110492459A (en) * | 2018-05-15 | 2019-11-22 | 广州小鹏汽车科技有限公司 | A kind of high-voltage discharge method, device and motor |
| CN109484186A (en) * | 2018-12-25 | 2019-03-19 | 华人运通控股有限公司 | Electric car active charging method and device |
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