CN211320956U - Charging and discharging circuit and charging and discharging system of online power supply - Google Patents

Charging and discharging circuit and charging and discharging system of online power supply Download PDF

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Publication number
CN211320956U
CN211320956U CN201922185642.4U CN201922185642U CN211320956U CN 211320956 U CN211320956 U CN 211320956U CN 201922185642 U CN201922185642 U CN 201922185642U CN 211320956 U CN211320956 U CN 211320956U
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charging
circuit
discharging
power supply
charge
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王少明
闫振华
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Luoyang Storage And Transformation System Co ltd
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Luoyang Storage And Transformation System Co ltd
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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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations

Abstract

The utility model relates to a charge-discharge circuit and charge-discharge system of online power supply, including charger, charge-discharge circuit and load, charge-discharge circuit includes charge circuit, charge switch and discharge circuit, and charge circuit's input is connected charger direct current output end, and charge circuit's output is connected the energy storage unit, and charge switch establishes in charge circuit in series for the control cuts off charge circuit; the input end of the discharging loop is connected with the energy storage unit, the output end of the discharging loop is connected with the load, and the pre-charging circuit is arranged in the discharging loop in series. The utility model discloses a charge input end and discharge output are different, can realize that the limit charges and discharge, and the stability of output voltage can be guaranteed to the precharge circuit in the return circuit that discharges moreover, strengthens the suitability of online power.

Description

Charging and discharging circuit and charging and discharging system of online power supply
Technical Field
The utility model relates to a charge-discharge circuit and charge-discharge system of online power.
Background
The traditional lead-acid battery is gradually replaced by a new lithium battery due to the defects of large volume, heavy weight, serious pollution, short cycle life and the like, the online backup power supply is widely applied, and the online backup power supply is more and more applied to communication backup power supplies and data centers; with the development of electric vehicle technology and the increase of high-power charging demand, because the current power network can not meet the requirement of high-power charging, the power expansion cost is increased sharply and more waste is caused, and by combining new energy sources such as wind and light and the energy storage technology, the capacity expansion can be carried out at low cost, the power requirement of high-power charging is met, and meanwhile, the utilization of green energy sources is realized.
At present, a common cathode diode and a MOS (metal oxide semiconductor) tube are often adopted in a 48V low-voltage system to realize an online power supply design, but the 48V low-voltage system has low application voltage and can only be applied to power supply equipment below 100V, and the common working current is not high. Above 100V, a common cathode diode and a contactor are designed in the same port in the application field, but the situation that the contactor is adhered due to the fact that the contactor is cut off when the battery pack is in fault in the implementation process exists, and the charging and discharging same port design adopted by the design scheme is not suitable for occasions like charging of electric automobiles, so that the existing online power supply is limited.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a charge-discharge circuit and charge-discharge system of online power to there is the problem of limitation in the use of solving current online power.
To solve the above technical problem, an online power supply charging/discharging circuit is provided, which comprises
The input end of the charging loop is connected with the direct current output end of the charger, the output end of the charging loop is connected with the energy storage unit, and the energy storage unit comprises a battery pack;
the charging switch is serially arranged in the charging loop and used for controlling the cut-off of the charging loop;
the input end of the discharging loop is connected with the energy storage unit, and the output end of the discharging loop is used for connecting a load; the discharging loop is provided with a pre-charging circuit in series.
The beneficial effects are that: the utility model discloses a charge-discharge circuit of online power supply, its charge circuit's input is different with the output in discharge circuit, can realize the limit of online power supply through this control to the charging switch and charge the limit and discharge, and the pre-charge circuit in the discharge circuit can guarantee output voltage's stability moreover to strengthen the suitability of online power supply.
Furthermore, the pre-charging circuit comprises two parallel branches, one branch comprises a first pre-charging switch and a pre-charging resistor which are connected in series, and the other branch comprises a second pre-charging switch which is connected in series. When the load has the capacity, carry out the preliminary charging to the generating line through the reasonable control of pre-charge circuit, can play the effect of preventing the adhesion.
Furthermore, the energy storage unit further comprises a battery management system, and the battery management system is connected with the charging switch in a control mode.
The energy storage device further comprises a heating branch, wherein the heating branch is connected to two ends of the energy storage unit in parallel; and the heating branch is connected with a heating device in series.
Furthermore, a heating contactor is further connected in series on the heating branch for cutting off the heating branch.
Further, the heating device includes a PTC heating sheet.
Furthermore, the charging switch is a charging contactor, the first pre-charging switch is a first pre-charging contactor, and the second pre-charging switch is a second pre-charging contactor.
In order to solve the technical problem, the charging and discharging system of the online power supply comprises a charger, a charging and discharging circuit and a load, wherein the charging and discharging circuit is the charging and discharging circuit of the online power supply.
Drawings
FIG. 1 is a schematic circuit diagram of a charging and discharging system of an online power supply according to the present invention;
FIG. 2 is a flow chart of the process of the online power supply during initialization;
FIG. 3 is a flow chart of the charge and discharge management of the online power supply of the present invention;
FIG. 4 is a flowchart illustrating the discharge condition determination of the online power supply of the present invention;
FIG. 5 is a flow chart of the charging control strategy of the online power supply of the present invention;
FIG. 6 is a flow chart of the heating control of the on-line power supply of the present invention;
FIG. 7 is a control flow chart of the online power supply of the present invention during charging and discharging;
FIG. 8 is a flowchart illustrating the charging control of the online power supply according to the present invention;
FIG. 9 is a high-voltage power-off flow chart of the online power supply of the present invention;
FIG. 10 is a high voltage discharge power-on flow chart of the online power supply of the present invention;
FIG. 11 is a flowchart illustrating the control of the discharge of the online power supply of the present invention;
FIG. 12 is a flow chart of the online power discharge under high voltage;
reference numerals: 1. a charger; 2. a charging contactor; 3. heating the contactor; 4. a heating element; 5. heating the fuse; 6. a battery pack; 7. a fuse; 8. a main contactor; 9. a first pre-charge contactor; 10. pre-charging a resistor; 11. a second pre-charge contactor; 12. a positive output end; 13. and a negative electrode output end.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings and examples, but the embodiments of the present invention are not limited thereto.
The utility model is suitable for a high-power occasion of discharging in short-term can follow electric wire netting or diesel generator and acquire and last the miniwatt electric energy to provide discharge to high-power load by the energy storage unit. For example, in a port, a power grid is adopted to supply power to loads such as a port electrified aviation crane and the like, and simultaneously, a battery pack is charged, when the load works in a short time and at high power, the battery pack immediately provides high-power output, and when the load power is lower, the battery pack immediately enters a charging state; or in the field of launching of certain high-energy weapons, the power is supplied by using diesel engine, the output of the rectifier supplies power to the weapons and the auxiliary system, and simultaneously the battery pack is charged, the short-time work of the weapon system needs higher power to discharge, and the battery pack provides short-time high-power output.
The embodiment of the charging and discharging system comprises:
the charging and discharging system of the online power supply comprises a charger, a charging and discharging circuit and a load; the charging and discharging circuit comprises a charging loop, a charging switch and a discharging loop; the input end of the charging loop is connected with the direct current output end of the charger, the output end of the charging loop is connected with the energy storage unit, and the energy storage unit comprises a battery pack; the charging switch is arranged in the charging loop in series and used for controlling the charging loop to be cut off; the input end of the discharging loop is connected with the energy storage unit, and the output end of the discharging loop is used for connecting a load; the discharging loop is provided with a pre-charging circuit in series.
The utility model discloses a charge-discharge system circuit principle of online power is shown in fig. 1, and it only introduces in detail as a concrete implementation mode the utility model discloses a charge-discharge system and use thereof.
The charger is a device for converting alternating current into direct current, diesel power or commercial power is converted into direct current in a charging and discharging system, and the charger 1 provides electric energy to charge the energy storage unit; the direct current output end of the charger is connected with the energy storage unit through the output of the charging contactor 2, the charging contactor 2 which is serially arranged on the charging loop is a charging switch, the charging contactor 2 is closed, the charger 1 charges the energy storage unit, the charging contactor 2 is disconnected, and the charger 1 stops discharging; the starting and stopping of the charging can be achieved by controlling the state of the charging contacts 2.
The energy storage unit comprises a battery pack 6, a fuse 7 and a main contactor 8 which are connected in series, wherein the battery pack 6 is formed by 2-216 series single battery cells, and as other real-time modes, batteries with other quantities can be connected in series and in parallel. The battery pack 6 is also provided with a battery management system BMS, and the battery management system BMS of the battery pack 6 is in real-time communication with the charger 1 and mainly completes the setting of charging voltage, current and power; the battery management system BMS also monitors the state information and the fault information of the single battery cells in the corresponding battery pack in real time, namely monitors the battery cell information and transmits the monitored information to other upper computers or other monitoring equipment. The switching of charging and discharging modes and the starting and stopping of the charger can be completed by monitoring the battery core of the battery pack.
The state information comprises the voltage, the current, the SOC and the SOH of the battery pack, and the voltage and the temperature of the single battery; the fault information comprises overvoltage and undervoltage alarm and protection, high-temperature and low-temperature alarm and protection, overcurrent alarm and protection, insulation monitoring alarm and protection, reverse connection alarm and protection, over-high and over-low SOC (state of charge) alarm and the like of the battery pack.
The battery management system controls the state of the charging contactor 2 according to the monitored SOC of the battery cell, when the battery management system sends charging information to the charger 1, the charger 1 charges according to a set requirement, and meanwhile, the charging contactor 2 is controlled to be closed, so that the charger 1 charges the battery pack 6; when the battery management system BMS sends the information of stopping charging to the charger 1, the charger 1 stops charging, and if the charger 1 fails to cut off the charging process successfully, the battery management system BMS actively controls to cut off the charging contactor to avoid overcharging the battery pack.
The pre-charging circuit arranged in series in the discharging circuit comprises two branch circuits connected in parallel, the first branch circuit comprises a first pre-charging switch and a pre-charging resistor 10 which are connected in series, and the other branch circuit comprises a second pre-charging switch arranged in series. The first pre-charging switch is a first pre-charging contactor 9, and the second pre-charging switch is a second pre-charging contactor 11; the first pre-charging contactor 9, the pre-charging resistor 10 and the second pre-charging contactor 11 form a bus pre-charging loop, when a load has capacitance, the first pre-charging contactor 9 needs to be closed firstly, the second pre-charging contactor 11 is closed after a set time, and the first pre-charging contactor 9 is cut off, so that bus pre-charging is realized, and the function of preventing the second pre-charging contactor 11 from being adhered is achieved. While the first pre-charge contactor 9 and the second pre-charge contactor 11 states are pre-charged by control of the battery management system. One end of the discharging loop is connected with the positive electrode output end 12 through the pre-charging circuit, the other end of the discharging loop is connected with the negative electrode output end 13, the positive electrode output end 12 and the negative electrode output end 13 of the discharging loop are connected with a load, and the energy storage unit discharges to the load through the discharging loop.
The charging and discharging system also comprises a heating branch circuit, the heating branch circuit is connected at two ends of the energy storage unit in parallel, a heating device is connected on the heating branch circuit in series, the heating device is a heating element 4, the heating element can be a PTC heating sheet, and can also be a heating film or other heating devices; and a heating fuse 5 and a heating contactor 3 are also arranged on the heating branch in series, and the heating branch can be cut off under the control of a battery management system BMS. The charging and discharging system can set a heating opening value and a heating closing value according to the working characteristics of the energy storage unit and the ambient temperature condition, and after the charging and discharging system is electrified and reaches the heating opening value, the battery management system controls the heating contactor 3 to be closed and starts heating; when the heating closing value is reached, the heating contactor 3 is switched off, and the heating is stopped. In the heating process, when the heating branch is short-circuited or overloaded, the heating fuse 5 can be automatically cut off to play a role in protection.
It is right based on the foregoing the utility model discloses the introduction of the charge-discharge system circuit principle of online power is introduced different working processes respectively below.
Firstly, initialization and high-voltage power-on processes:
as shown in fig. 2, after the charging and discharging system of the online power supply is powered on at low voltage, the BMS, the charger and other communication devices start to initialize and perform self-checking, if there is a fault, the fault is reported, and high-voltage power on is not performed any more, so that power on cannot be completed, if there is no fault, the state monitoring of the battery pack, the charging contactor, the heating contactor, the first pre-charging contactor, the second pre-charging contactor, the main contactor and the like is performed, and after there is no fault, the charging handshake stage is entered: firstly, setting charging voltage, current, power and the like through a battery management system BMS, then closing a main contactor, delaying for 200ms, carrying out fault detection on the main contactor in the delaying process, and if the main contactor has a fault, disconnecting the main contactor, and delaying to control the charging high voltage to be reduced; if the main contactor has no fault, the charging contactor is closed again, 200ms of delay is carried out, insulation detection is carried out in the delay process, if the charging and discharging system meets the insulation requirement, the electrifying process is completed, and charging and discharging management can be continuously carried out.
Secondly, charge and discharge management process:
after the system is powered on, continuously executing charge and discharge management as shown in fig. 3, firstly, judging whether the charger 1 has external power supply, if no, entering a to-be-discharged inquiry state, and entering a discharging process after an external discharging demand command arrives; if the charger 1 is supplied with external power, it is necessary to determine whether the SOC of the battery pack 6 is greater than a set value, the set value may be set according to a requirement, for example, 90%, that is, if the SOC is greater than 90%, the charger 1 enters a standby state, and when the battery pack 6 enters a to-be-discharged state and meets a discharge condition, a discharge strategy is executed; and if the SOC is not more than 90%, the energy storage unit enters a charging process.
Wherein, the discharging condition is as shown in fig. 4, the discharging condition is allowed to set that the battery pack 6 is in the state of charge of 70% SOC & lt 100%, and the temperature is in the range of 10 ℃ SOC & lt 60 ℃ or in the state of charge of 40% SOC & lt 70%, and the temperature is in the range of 25 ℃ SOC & lt 60 ℃, and the other conditions are not allowed to discharge, if the above conditions are satisfied, the discharging process can be executed, and the specific threshold division of discharging can be carried out according to the specific requirements.
As shown in fig. 5, the charging process of the online power supply is performed, when the battery temperature is lower than 10 ℃ under the condition of the external power supply AC380V, the heating is started, and when the battery temperature is heated to 15 ℃, the heating is stopped. When the temperature is lower than minus 5 ℃, the charging mode is entered, when the temperature is between minus 5 ℃ and 10 ℃, the charging mode is entered, when the temperature is higher than 15 ℃, the charging mode is entered, and it is required to be noted that the specific temperature value can be set according to the actual project requirement and the battery performance.
As shown in FIG. 6, the heating control process of the online power supply is performed, first, the BMS allows the charger 1 to send a small current IminThe charging circuit is formed, then the heating contactor 3 is closed, the heating circuit is formed, then the charging circuit is opened, and then the charging current I1 and the voltage U1 are sent, and the online power supply enters the heating only mode.
Fig. 7 shows the control process of charging and discharging the online power supply: firstly, after the main battery pack contactor 8, the charging contactor 2 and the heating contactor 3 are closed, a charging loop and a heating loop are formed, the BMS controls the charging process, controls the sum I2 of the charging current and the heating current of the charger and the allowable charging voltage U2 of the battery pack, and simultaneously, if the discharging condition is met and a discharging request exists, controls and manages the charging and the discharging simultaneously.
As shown in FIG. 8, in the control process of charging only of the online power supply, after the main contactor 8 and the charging contactor 2 of the battery pack are closed, the heating contactor 3 is turned off, and the BMS allows the charging current I of the chargerchargeAnd allowable charging voltage U of battery pack2The charge-only management mode is performed. When there is a discharge request, the discharge control process is executed again.
Fig. 9 shows the voltage reduction process under the charging high voltage of the online power supply: firstly, the charger 1 stops outputting, when the battery pack monitors current to minimum current, the heating contactor 3 and the charging contactor 2 are sequentially disconnected, states of the heating contactor and the charging contactor are judged, if the heating contactor and the charging contactor are not in fault, the main contactor 8 is disconnected, data are stored in the charging and discharging control process, and charging and discharging under high voltage are completed.
Fig. 10 shows the high-voltage power-on process of the discharge process of the online power supply: firstly, a counter is cleared, whether a main circuit contactor has a fault or not is judged, then a main contactor 8 is closed, whether a first pre-charging contactor 7 and a second pre-charging contactor 11 have a fault or not is judged, after judgment and monitoring are completed, a battery pack 6 closes the first pre-charging contactor 7, bus voltage Um and battery pack voltage Ub are monitored, after 95% pre-charging is met, the second pre-charging contactor 11 is closed, 200ms of delay is carried out (delay time can be set according to actual working conditions), the pre-charging contactors are disconnected, and bus pre-charging is completed.
Fig. 11 shows the discharge control process of the online power supply: firstly, after a background power-off command is received, closing a main contactor, delaying, controlling a first pre-charging contactor to be closed, further judging whether a second pre-charging contactor is closed, judging whether a battery pack is under-voltage or has a power failure when the second pre-charging contactor is judged to be closed, reporting the battery pack if the battery pack has the under-voltage or the power failure, and indicating that the high-voltage power-off in the discharging process is successful if the battery pack has no failure; and when the second pre-charging contactor is disconnected, the discharging contactor is controlled to be closed, and discharging is carried out until discharging is finished.
As shown in fig. 12, it is the current process at high voltage discharge: first, the heating contactor 3, the discharging contactor 11, and the main circuit contactor 8 are sequentially turned off, the BMS of the battery pack completes data storage within a set time, and the discharging high voltage reduction is completed.
The battery pack in the above embodiment may be a lithium battery, and as another embodiment, the battery pack in the power supply system may also be composed of batteries of other types or models.
Charging and discharging circuit embodiment:
the charging and discharging circuit of the online power supply comprises a charging loop, a charging switch and a discharging loop, wherein the input end of the charging loop is used for being connected with the direct-current output end of a charger, and the output end of the charging loop is connected with an energy storage unit; the charging switch is arranged in the charging loop in series and used for controlling the charging loop to be cut off; the input end of the discharging loop is connected with the energy storage unit, and the output end of the discharging loop is used for connecting a load; the discharging loop is provided with a pre-charging circuit in series. The structure and the principle process of the charge and discharge circuit are described in detail in the above embodiments of the charge and discharge system, and are not described herein again.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope thereof, and although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading the present application, those skilled in the art can still make various changes, modifications or equivalents to the specific embodiments of the application, but these changes, modifications or equivalents are all within the protection scope of the claims of the present invention.

Claims (8)

1. A charging and discharging circuit of an online power supply is characterized by comprising
The input end of the charging loop is connected with the direct current output end of the charger, the output end of the charging loop is connected with the energy storage unit, and the energy storage unit comprises a battery pack;
the charging switch is serially arranged in the charging loop and used for controlling the cut-off of the charging loop;
the input end of the discharging loop is connected with the energy storage unit, and the output end of the discharging loop is used for connecting a load; the discharging loop is provided with a pre-charging circuit in series.
2. The charging and discharging circuit of an online power supply as claimed in claim 1, wherein the pre-charging circuit comprises two parallel branches, one branch comprises a first pre-charging switch and a pre-charging resistor connected in series, and the other branch comprises a second pre-charging switch connected in series.
3. The charging and discharging circuit of an online power supply as claimed in claim 2, wherein the energy storage unit further comprises a battery management system, and the battery management system is connected with the charging switch in a control manner.
4. The charging and discharging circuit of on-line power supply of claim 3, further comprising
The heating branches are connected in parallel at two ends of the energy storage unit; and the heating branch is connected with a heating device in series.
5. The charging and discharging circuit of an online power supply as claimed in claim 4, wherein a heating contactor is further connected in series to the heating branch for cutting off the heating branch.
6. The charging and discharging circuit of an online power supply as claimed in claim 5, wherein the heating device comprises a PTC heating plate.
7. The charging/discharging circuit of on-line power supply as claimed in claim 6, wherein the charging switch is a charging contactor, the first pre-charging switch is a first pre-charging contactor, and the second pre-charging switch is a second pre-charging contactor.
8. An online power supply charging and discharging system, characterized in that, it comprises a charger, a charging and discharging circuit and a load, the charging and discharging circuit is the online power supply charging and discharging circuit of any claim 1-7.
CN201922185642.4U 2019-12-09 2019-12-09 Charging and discharging circuit and charging and discharging system of online power supply Active CN211320956U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114300785A (en) * 2021-12-31 2022-04-08 东莞市钜大电子有限公司 Heating method for power battery of pure electric vehicle
CN115765082A (en) * 2022-11-15 2023-03-07 北京航天发射技术研究所 Pre-charging control method and device for synchronous servo controller of special equipment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114300785A (en) * 2021-12-31 2022-04-08 东莞市钜大电子有限公司 Heating method for power battery of pure electric vehicle
CN114300785B (en) * 2021-12-31 2023-12-22 东莞市钜大电子有限公司 Heating method of power battery of pure electric vehicle
CN115765082A (en) * 2022-11-15 2023-03-07 北京航天发射技术研究所 Pre-charging control method and device for synchronous servo controller of special equipment

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