CN113263914B - Multi-path pre-charging high-voltage system based on single pre-charging resistor and pre-charging method - Google Patents
Multi-path pre-charging high-voltage system based on single pre-charging resistor and pre-charging method Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
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Abstract
The invention belongs to the technical field of high voltage of new energy automobiles, and particularly relates to a multi-path pre-charging high-voltage system and a pre-charging method based on a single pre-charging resistor. The device comprises a battery pack and an integrated machine; the battery pack is electrically connected with the all-in-one machine; a high-voltage component pre-charging positive electrode interface circuit and a high-voltage component pre-charging negative electrode interface circuit are arranged in the all-in-one machine; the battery pack is internally provided with a power supply, the high-voltage component pre-charging positive electrode interface circuit is electrically connected with a positive electrode of the power supply, and the high-voltage component pre-charging negative electrode interface circuit is electrically connected with a negative electrode of the power supply; the high-voltage component pre-charge positive interface circuit includes a single pre-charge resistor R for pre-charging a plurality of high-voltage components. The invention provides a single pre-charging resistor multi-path pre-charging method, which can realize the independent operation of each high-voltage component and has the characteristics of saving hardware cost and improving the safety performance of a new energy automobile.
Description
Technical Field
The invention belongs to the technical field of high voltage of new energy automobiles, and particularly relates to a multi-path pre-charging high-voltage system and a pre-charging method based on a single pre-charging resistor.
Background
Before starting a high-voltage component of a new energy automobile, the input end needs to be pre-charged so as to ensure that a connecting device (such as a contactor) is not subjected to arc discharge to cause adhesion when being closed. If a plurality of high-voltage components exist, separate pre-charging in steps is needed to ensure that each high-voltage component operates independently, and the influence caused by faults and the like among the high-voltage components is reduced. In the prior art, a method of allocating a pre-charging resistor to each high-voltage component is generally adopted to achieve the purpose of pre-charging a plurality of high-voltage components separately in steps, but the method increases the space for arrangement and has higher cost. Therefore, it is necessary to design a multi-channel pre-charging high-voltage system and method that can realize independent operation of each high-voltage component and reduce the cost.
For example, a high voltage pre-charging device, a pre-charging relay, a switch tube, a pre-charging resistor and a high voltage power supply, which are described in the chinese utility model with the application number CN 201920326662.6; the pre-charging relay, the switch tube and the pre-charging resistor are sequentially connected in series to form a driving circuit, and the positive pole of the high-voltage power supply is connected in series with the pre-charging relay in the driving circuit. Although the volume of the pre-charging loop can be reduced, the manufacturing cost is reduced, the switching loss can be reduced, the pre-charging time is controlled, the adhesion, burning and arc discharge of the contactor are effectively avoided, the pre-charging problem of a single-path high-voltage component can only be solved, the pre-charging problem of a plurality of paths of high-voltage components cannot be solved, and the hardware cost is greatly increased if the design is adopted to solve the pre-charging problem of the plurality of paths of high-voltage components.
Disclosure of Invention
The invention provides a single pre-charging resistor-based multi-path pre-charging high-voltage system and a pre-charging method, which can realize independent operation of each high-voltage component and save hardware cost, and aims to solve the problems that in the prior art, each high-voltage component is generally provided with a pre-charging resistor before being started to realize the purpose of pre-charging a plurality of high-voltage components step by step and independently, so that the system arrangement space is increased and the hardware cost is higher.
In order to achieve the purpose, the invention adopts the following technical scheme:
the multi-path pre-charging high-voltage system based on the single pre-charging resistor comprises a battery pack and an integrated machine; the battery pack is electrically connected with the all-in-one machine; a high-voltage component pre-charging positive electrode interface circuit and a high-voltage component pre-charging negative electrode interface circuit are arranged in the all-in-one machine; the battery pack is internally provided with a power supply, the high-voltage component pre-charging positive electrode interface circuit is electrically connected with a positive electrode of the power supply, and the high-voltage component pre-charging negative electrode interface circuit is electrically connected with a negative electrode of the power supply; the high-voltage component pre-charge positive interface circuit includes a single pre-charge resistor R for pre-charging a plurality of high-voltage components.
Preferably, the high-voltage component pre-charging positive electrode interface circuit comprises a plurality of hardware positive electrode interfaces; the high-voltage component pre-charging negative electrode interface circuit comprises a plurality of hardware negative electrode interfaces; the number of the hardware positive electrode interfaces is equal to that of the hardware negative electrode interfaces, and the hardware positive electrode interfaces and the hardware negative electrode interfaces correspond to each other.
Preferably, the battery pack further comprises a power supply and signal relay KS; the signal relay KS is electrically connected with the negative pole of the power supply.
Preferably, the interface circuit for pre-charging positive electrode of the high-voltage component further comprises a contactor KM, a polarization relay KP1, a polarization relay KP2, a differential relay KD, a relay KC, a fuse FU1, a fuse FU2, a fuse FU3, a fuse FU4, a fuse FU5 and a fuse FU 6; one end of the fuse FU4 is electrically connected with the positive electrode of a power supply, the fuse FU5 and the fuse FU6 respectively, and the other end of the fuse FU4 is electrically connected with the contactor KM, the single pre-charging resistor R and the differential relay KD respectively; the fuse FU6 is connected with the intermediate relay KC in series; the differential relay KD is electrically connected with the polarization relay KP2, the fuse FU1, the fuse FU2 and the fuse FU3 respectively; the single pre-charging resistor R is respectively and electrically connected with the polarized relay KP1 and the polarized relay KP 2; the contactor KM is electrically connected with a polarization relay KP 1.
Preferably, the hardware positive interface comprises an MCU + interface, a PTC + interface, an AC + interface, a DC + interface, an OBC + interface and a quick charge + interface; the MCU + interface is electrically connected with the contactor KM and the polarized relay KP1 respectively; the PTC + interface is electrically connected with a fuse FU 1; the AC + interface is electrically connected to fuse FU 2; the DC + interface is electrically connected with fuse FU 3; the OBC + interface is electrically connected with fuse FU 5; and the quick charging + interface is electrically connected with the intermediate relay KC.
Preferably, the hardware negative electrode interface comprises an MCU-interface, a PTC-interface, an AC-interface, a DC-interface, an OBC-interface and a quick charging-interface; the MCU-interface, the PTC-interface, the AC-interface, the DC-interface, the OBC-interface and the quick charging-interface are all electrically connected with a signal relay KS in the battery pack.
The invention also provides a pre-charging method of the multi-path pre-charging high-voltage system based on the single pre-charging resistor, which comprises the following steps:
s1, calculating equivalent capacitors C1, C2, … and Cn of each electric device, calculating the total equivalent capacitor 1/C (1/C1+1/C2+1/C3+ … +1/Cn) according to each equivalent capacitor, setting the required precharging time of the whole vehicle as t, and setting the required precharging time as t according to a formula
Obtaining a pre-charging resistor R;
wherein, V0Setting the initial voltage value on the equivalent capacitor C; vuSetting the voltage value of the equivalent capacitor C at the end of full charge; vtThe voltage value required to be reached on the equivalent capacitor C is set at any time t;
s2, calculating the precharging time T1, T2, … and Tn of each electric device, calculating by adopting the formula in the step S1 to obtain the values of the precharging time T1, T2, … and Tn, and if the precharging time T1+ T2+ T3+ … + Tn is less than the power-on time required by the whole vehicle, carrying out the next step;
s3, selecting a pre-charging relay matched with each electric device according to the pre-charging current of each electric device;
and S4, merging the electric equipment which works simultaneously, and independently designing a high-voltage loop for the electric equipment which works in a segmented and time-sharing mode.
Compared with the prior art, the invention has the beneficial effects that: (1) the invention provides a multi-path pre-charging method of a single pre-charging resistor, which can realize the independent operation of each high-voltage component and can save the hardware cost; (2) the design of the invention can improve the loop operation of the high-voltage components in the new energy automobile and coordinate the working cooperation among the high-voltage components, thereby improving the safety performance of the whole new energy automobile.
Drawings
Fig. 1 is a schematic circuit diagram of a multi-path pre-charging high-voltage system based on a single pre-charging resistor according to the present invention.
In the figure: battery package 1, all-in-one 2.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, the following description will explain the embodiments of the present invention with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
Example 1:
the multi-path pre-charging high-voltage system based on the single pre-charging resistor as shown in fig. 1 comprises a battery pack and an integrated machine; the battery pack 1 is electrically connected with the all-in-one machine 2; a high-voltage component pre-charging positive electrode interface circuit and a high-voltage component pre-charging negative electrode interface circuit are arranged in the all-in-one machine; the battery pack is internally provided with a power supply, the high-voltage component pre-charging positive electrode interface circuit is electrically connected with a positive electrode of the power supply, and the high-voltage component pre-charging negative electrode interface circuit is electrically connected with a negative electrode of the power supply; the high-voltage component pre-charge positive interface circuit includes a single pre-charge resistor R for pre-charging a plurality of high-voltage components. The all-in-one machine is applied to a new energy automobile.
Further, the high-voltage component pre-charging positive electrode interface circuit comprises 6 hardware positive electrode interfaces; the high-voltage component pre-charging negative electrode interface circuit comprises 6 hardware negative electrode interfaces; the hardware positive electrode interface corresponds to the hardware negative electrode interface in type. The hardware anode interface and the hardware cathode interface are used for externally connecting electric equipment.
Further, the battery pack also comprises a power supply and a signal relay KS; the signal relay KS is electrically connected with the negative pole of the power supply. The power supply is provided with a manual maintenance switch MSD for disconnecting the power supply of the high-voltage system in a manual mode, so that the maintenance is convenient and the safety is improved. And the signal relay KS is used for controlling the on-off of a negative pole loop of the power supply.
Further, the interface circuit for pre-charging positive electrodes of the high-voltage components further comprises a contactor KM, a polarization relay KP1, a polarization relay KP2, a differential relay KD, an intermediate relay KC, a fuse FU1, a fuse FU2, a fuse FU3, a fuse FU4, a fuse FU5 and a fuse FU 6; one end of the fuse FU4 is electrically connected with the positive electrode of a power supply, the fuse FU5 and the fuse FU6 respectively, and the other end of the fuse FU4 is electrically connected with the contactor KM, the single pre-charging resistor R and the differential relay KD respectively; the fuse FU6 is connected with the intermediate relay KC in series; the differential relay KD is electrically connected with the polarization relay KP2, the fuse FU1, the fuse FU2 and the fuse FU3 respectively; the single pre-charging resistor R is respectively and electrically connected with the polarized relay KP1 and the polarized relay KP 2; the contactor KM is electrically connected with a polarization relay KP 1. Each fuse is used for protecting the safety of each branch in the circuit, and the contactor and the relay are used for controlling the on-off of each branch in the circuit.
Furthermore, the hardware positive interface comprises an MCU + interface, a PTC + interface, an AC + interface, a DC + interface, an OBC + interface and a quick charge + interface; the MCU + interface is electrically connected with the contactor KM and the polarized relay KP1 respectively; the PTC + interface is electrically connected with a fuse FU 1; the AC + interface is electrically connected to fuse FU 2; the DC + interface is electrically connected with fuse FU 3; the OBC + interface is electrically connected with fuse FU 5; and the quick charging + interface is electrically connected with the intermediate relay KC.
Furthermore, the hardware negative electrode interface comprises an MCU-interface, a PTC-interface, an AC-interface, a DC-interface, an OBC-interface and a quick charging-interface; the MCU-interface, the PTC-interface, the AC-interface, the DC-interface, the OBC-interface and the quick charging-interface are all electrically connected with a signal relay KS in the battery pack.
And the high-voltage component returns to the negative electrode of the power supply finally from the positive electrode of the power supply through the hardware positive electrode interface, the external high-voltage component and the hardware negative electrode interface to form an independent operation loop of the high-voltage component. The operation loops of each high-voltage component are independent of each other.
Based on embodiment 1, the present invention further provides a pre-charging method for a multi-path pre-charging high-voltage system based on a single pre-charging resistor, comprising the following steps:
s1, calculating equivalent capacitors C1, C2, … and Cn of each electric device, calculating the total equivalent capacitor 1/C (1/C1+1/C2+1/C3+ … +1/Cn) according to each equivalent capacitor, setting the required precharging time of the whole vehicle as t, and setting the required precharging time as t according to a formula
Obtaining a pre-charging resistor R;
wherein, V0Setting the initial voltage value on the equivalent capacitor C; vuSetting the voltage value of the equivalent capacitor C at the end of full charge; vtThe voltage value required to be reached on the equivalent capacitor C is set at any time t;
s2, calculating the precharging time T1, T2, … and Tn of each electric device, calculating by adopting the formula in the step S1 to obtain the values of the precharging time T1, T2, … and Tn, and if the precharging time T1+ T2+ T3+ … + Tn is less than the power-on time required by the whole vehicle, carrying out the next step;
s3, selecting a pre-charging relay matched with each electric device according to the pre-charging current of each electric device;
and S4, merging the electric equipment which works simultaneously, and independently designing a high-voltage loop for the electric equipment which works in a segmented and time-sharing mode.
By utilizing the method and the process, the specific design of the multi-path pre-charging high-voltage system based on the single pre-charging resistor can be realized.
The invention provides a multi-path pre-charging method of a single pre-charging resistor, which can realize the independent operation of each high-voltage component and can save the hardware cost; the design of the invention can improve the loop operation of the high-voltage components in the new energy automobile and coordinate the working cooperation among the high-voltage components, thereby improving the safety performance of the whole new energy automobile.
The foregoing has outlined rather broadly the preferred embodiments and principles of the present invention and it will be appreciated that those skilled in the art may devise variations of the present invention that are within the spirit and scope of the appended claims.
Claims (5)
1. The multi-path pre-charging high-voltage system based on the single pre-charging resistor is characterized by comprising a battery pack and an integrated machine; the battery pack is electrically connected with the all-in-one machine; a high-voltage component pre-charging positive electrode interface circuit and a high-voltage component pre-charging negative electrode interface circuit are arranged in the all-in-one machine; the battery pack is internally provided with a power supply, the high-voltage component pre-charging positive electrode interface circuit is electrically connected with a positive electrode of the power supply, and the high-voltage component pre-charging negative electrode interface circuit is electrically connected with a negative electrode of the power supply; the high-voltage component pre-charging positive electrode interface circuit comprises a single pre-charging resistor R for pre-charging a plurality of high-voltage components; the battery pack further comprises a power supply and signal relay KS; the signal relay KS is electrically connected with the negative pole of a power supply; the interface circuit for pre-charging the positive electrode of the high-voltage component further comprises a contactor KM, a polarization relay KP1, a polarization relay KP2, a differential relay KD, an intermediate relay KC, a fuse FU1, a fuse FU2, a fuse FU3, a fuse FU4, a fuse FU5 and a fuse FU 6; one end of the fuse FU4 is electrically connected with the positive electrode of a power supply, the fuse FU5 and the fuse FU6 respectively, and the other end of the fuse FU4 is electrically connected with the contactor KM, the single pre-charging resistor R and the differential relay KD respectively; the fuse FU6 is connected with the intermediate relay KC in series; the differential relay KD is electrically connected with the polarization relay KP2, the fuse FU1, the fuse FU2 and the fuse FU3 respectively; the single pre-charging resistor R is respectively and electrically connected with the polarized relay KP1 and the polarized relay KP 2; the contactor KM is electrically connected with a polarization relay KP 1.
2. The multi-path pre-charging high-voltage system based on the single pre-charging resistor is characterized in that the high-voltage component pre-charging positive electrode interface circuit comprises a plurality of hardware positive electrode interfaces; the high-voltage component pre-charging negative electrode interface circuit comprises a plurality of hardware negative electrode interfaces; the number of the hardware positive electrode interfaces is equal to that of the hardware negative electrode interfaces, and the hardware positive electrode interfaces and the hardware negative electrode interfaces correspond to each other.
3. The multi-path pre-charge high-voltage system based on the single pre-charge resistor, according to claim 2, wherein the hardware positive interface comprises an MCU + interface, a PTC + interface, an AC + interface, a DC + interface, an OBC + interface and a fast charge + interface; the MCU + interface is electrically connected with the contactor KM and the polarized relay KP1 respectively; the PTC + interface is electrically connected with a fuse FU 1; the AC + interface is electrically connected to fuse FU 2; the DC + interface is electrically connected with fuse FU 3; the OBC + interface is electrically connected with fuse FU 5; and the quick charging + interface is electrically connected with the intermediate relay KC.
4. The single pre-charge resistance based multi-path pre-charge high voltage system according to claim 2, wherein the hardware negative interface comprises an MCU-interface, a PTC-interface, an AC-interface, a DC-interface, an OBC-interface, and a fast charge-interface; the MCU-interface, the PTC-interface, the AC-interface, the DC-interface, the OBC-interface and the quick charging-interface are all electrically connected with a signal relay KS in the battery pack.
5. The pre-charging method of the multi-path pre-charging high-voltage system based on the single pre-charging resistor is characterized by comprising the following steps:
s1, calculating equivalent capacitors C1, C2, … and Cn of each electric device, calculating the total equivalent capacitor 1/C = (1/C1+1/C2+1/C3+ … +1/Cn) according to each equivalent capacitor, setting the required pre-charging time of the whole vehicle to be t, and setting the required pre-charging time of the whole vehicle to be t according to a formula
Obtaining a pre-charging resistor R;
wherein, the first and the second end of the pipe are connected with each other,
to a set equivalent capacitance CThe initial voltage value of (a);
setting the voltage value of the equivalent capacitor C at the end of full charge;
the voltage value required to be reached on the equivalent capacitor C is set at any time t;
s2, calculating the pre-charging time T1, T2, … and Tn of each electric device, calculating by adopting a formula in the step S1 to obtain the values of the pre-charging time T1, T2, … and Tn, and if the pre-charging time T1+ T2+ T3+ … + Tn is less than the power-on time required by the whole vehicle, carrying out the next step;
s3, selecting a pre-charging relay matched with each electric device according to the pre-charging current of each electric device;
and S4, merging the electric equipment which works simultaneously, and independently designing a high-voltage loop for the electric equipment which works in a segmented and time-sharing mode.
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| CN205930299U (en) * | 2016-07-21 | 2017-02-08 | 潍柴动力股份有限公司 | Electric automobile high voltage power distribution circuit |
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Denomination of invention: A multi-channel pre charging high-voltage system and pre charging method based on a single pre charging resistor Granted publication date: 20220513 Pledgee: Tongxiang Science and Technology Entrepreneurship Service Center Co.,Ltd. Pledgor: United New Energy Automobile Co.,Ltd. Registration number: Y2024330000709 |
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