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CN211493678U - Pre-charging device of power battery and vehicle - Google Patents

Pre-charging device of power battery and vehicle Download PDF

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Publication number
CN211493678U
CN211493678U CN201921640160.7U CN201921640160U CN211493678U CN 211493678 U CN211493678 U CN 211493678U CN 201921640160 U CN201921640160 U CN 201921640160U CN 211493678 U CN211493678 U CN 211493678U
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voltage
transformer
power battery
low
battery
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CN201921640160.7U
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Inventor
靳旭
张春
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Beiqi Foton Motor Co Ltd
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Beiqi Foton Motor 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
    • 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
    • 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
    • Y02T90/14—Plug-in electric vehicles

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  • Electric Propulsion And Braking For Vehicles (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The present disclosure relates to a pre-charging device for a power battery and a vehicle. The pre-charging device comprises a transformer and a low-voltage storage battery, the input end of the transformer is connected with the low-voltage storage battery, the positive output end of the transformer is connected with the positive pole of the power battery through a main positive relay, the negative output end of the transformer is connected with the negative pole of the power battery through a main negative relay, and the transformer is used for boosting the voltage of the low-voltage storage battery and then outputting the boosted voltage. Because this transformer can be with the low-voltage conversion of low-voltage battery to the high voltage similar with power battery total voltage, on the one hand, need not connect in parallel on main positive relay pre-charge resistance, avoided the risk that pre-charge resistance burns out, and on the other hand, pre-charge can independently carry out with power battery's self-checking, and the opportunity of pre-charge can be adjusted in a flexible way, has improved power battery's start-up efficiency.

Description

Pre-charging device of power battery and vehicle
Technical Field
The disclosure relates to the field of electric vehicle control, in particular to a pre-charging device of a power battery and a vehicle.
Background
At present, electric power is widely used in the automobile industry as a new power source of vehicles. Common vehicles can be classified into fuel vehicles, pure electric vehicles, and hybrid vehicles according to the difference of power sources.
In electric-only vehicles and hybrid vehicles, the power battery may provide a source of power for the vehicle. Before the power battery is powered on, if the difference between the input voltage (voltage on the equivalent capacitor between the input ends of the functional modules) of each functional module loaded in the power battery loop and the total voltage of the power battery is too large, the equivalent capacitor can be rapidly discharged. In order to avoid generating excessive current on the equivalent capacitor, the input end (power battery loop) of each functional module is pre-charged with small current before the power battery is powered on. Therefore, the protection scheme for pure electric and plug-in hybrid vehicles is to add a pre-charging circuit in the circuit, pre-charge the battery by using a resistance current-limiting method, and complete the pre-charging process when the voltage on the equivalent capacitor reaches a certain level (close to the total voltage of the power battery).
The current precharging scheme has poor expansibility, cannot be used when the vehicle type of the whole vehicle is rectified and modified and cannot be expanded at any time; the pre-charging time cannot be adjusted: the pre-charging time is solidified and cannot be adjusted according to requirements; the risk of burning out the pre-charge resistor is relatively high.
SUMMERY OF THE UTILITY MODEL
The purpose of this disclosure is to provide a power battery's pre-charging device, vehicle that reliability is higher.
In order to achieve the above object, the present disclosure provides a pre-charging device for a power battery, the pre-charging device includes a transformer and a low-voltage battery, an input end of the transformer is connected to the low-voltage battery, an anode output end of the transformer is connected to an anode of the power battery through a main anode relay, a cathode output end of the transformer is connected to a cathode of the power battery through a main cathode relay, and the transformer is configured to boost a voltage of the low-voltage battery and then output the boosted voltage.
Optionally, the transformer is a DCDC converter.
Optionally, the transformer is a DCDC bi-directional converter.
Optionally, the transformer is a step-up transformer.
Optionally, the pre-charging device further comprises:
one end of the voltage collector is connected between the positive output end of the transformer and the main positive relay, and the other end of the voltage collector is connected between the negative output end of the transformer and the main negative relay, and the voltage collector is used for collecting voltage in a power battery loop;
and the controller is respectively connected with the voltage collector and the control end of the transformer and is used for controlling the transformer to stop running when the voltage collected by the voltage collector is within a preset threshold range.
Optionally, the controller is integrated in a vehicle control unit of the vehicle.
Optionally, the voltage harvester is integrated in a battery management system of the vehicle.
The present disclosure also provides a vehicle including the above-mentioned pre-charging device provided by the present disclosure.
Through the technical scheme, the transformer is connected in parallel in the main loop of the power battery, and is connected with the low-voltage storage battery. During the process of pre-charging the power battery loop, the transformer can convert the low voltage of the low-voltage storage battery into a high voltage which is close to the total voltage of the power battery. On the one hand, the pre-charging resistor does not need to be connected in parallel to the main positive relay, the risk of burning the pre-charging resistor is avoided, on the other hand, the pre-charging and the self-checking of the power battery can be independently carried out, the pre-charging time can be flexibly adjusted, and the starting efficiency of the power battery is improved.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a block diagram illustrating a pre-charging apparatus for a power battery according to an exemplary embodiment;
FIG. 2 is a schematic diagram of a pre-charging device for a power battery according to an exemplary embodiment during pre-charging;
fig. 3 is a flow chart of power battery power up according to an exemplary embodiment.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
As described above, the protection scheme for pure electric and plug-in hybrid vehicles is to add a pre-charging loop in the loop and perform pre-charging in a manner of limiting current by using a resistor. In this case, the time for precharging is fixed, and the risk of burning the precharging resistor is also higher. The inventor thinks that the pre-charging process of the power battery can be completed by additionally connecting a transformer in parallel in the main loop of the power battery, and converting low voltage (for example, 12V, 24V and 48V) in the low-voltage storage battery into high voltage close to the total voltage (for example, 310V) of the power battery through the transformer. Therefore, the conventional pre-charging resistor is not required to be utilized, the risk of burning the pre-charging resistor is avoided, the pre-charging and the self-checking of the power battery can be independently carried out, the pre-charging time can be flexibly adjusted, and the starting efficiency of the power battery is improved.
Fig. 1 is a block diagram illustrating a structure of a pre-charging device for a power battery according to an exemplary embodiment. As shown in fig. 1, the pre-charging device may include a transformer and a low-voltage battery, an input terminal of the transformer is connected to the low-voltage battery, an anode output terminal of the transformer is connected to an anode of the power battery through a main anode relay, and a cathode output terminal of the transformer is connected to a cathode of the power battery through a main cathode relay. The transformer is used for boosting the voltage of the low-voltage storage battery and then outputting the boosted voltage.
The voltage output of the low-voltage storage battery is direct current, and the main loop of the power battery is also direct current. Thus, the transformer may be a DCDC (direct current to direct current) converter or a DCDC bi-directional converter. In the solution of the present disclosure, the main role of the transformer is to transform the low voltage of the low voltage accumulator into a high voltage close to the total voltage of the power cells. Thus, the transformer may be a step-up transformer.
The transformer comprises a positive input end, a negative input end and a positive output end. The positive and negative input ends can be respectively connected with the positive and negative ends of a low-voltage storage battery in the vehicle. When the main loop of the power battery needs to be precharged, the transformer can be controlled to boost the voltage of the low-voltage storage battery and then output the boosted voltage, so that the input voltage of each functional module connected in parallel in the main loop of the power battery is close to the total voltage of the power battery, and the precharging is completed.
Any transformer capable of converting an input several tens of volts of dc voltage into several hundreds of volts of dc voltage is included in the scope of the present disclosure, and its specific type is easily selected by those skilled in the art and is not listed here. The transformer can be arranged independently or integrated with the existing DCDC module of the vehicle.
Through the technical scheme, the transformer is connected in parallel in the main loop of the power battery, and is connected with the low-voltage storage battery. During the process of pre-charging the power battery loop, the transformer can convert the low voltage of the low-voltage storage battery into a high voltage which is close to the total voltage of the power battery. On the one hand, the pre-charging resistor does not need to be connected in parallel to the main positive relay, the risk of burning the pre-charging resistor is avoided, on the other hand, the pre-charging and the self-checking of the power battery can be independently carried out, the pre-charging time can be flexibly adjusted, and the starting efficiency of the power battery is improved.
In yet another embodiment, the pre-charging device may further include a voltage collector and a controller.
One end of the voltage collector is connected between the positive output end of the transformer and the main positive relay, the other end of the voltage collector is connected between the negative output end of the transformer and the main negative relay, and the voltage collector is used for collecting voltage in the power battery loop.
The controller is respectively connected with the voltage collector and the control end of the transformer and is used for controlling the transformer to stop running when the voltage collected by the voltage collector is within a preset threshold range.
The transformer comprises a positive input end, a negative input end, a positive output end and a negative output end, and further comprises a control end. The control end is connected with external equipment and used for receiving a control signal so as to control the operation or stop of the transformer.
The controller may be integrated into a vehicle controller of the vehicle, which sends out control signals according to a control strategy therein. The voltage harvester may be integrated in a battery management system of the vehicle.
The predetermined threshold range may be obtained empirically or experimentally. For example, the predetermined threshold range may be a voltage value around the total voltage U of the power battery (e.g., U × 95%).
Fig. 2 is a schematic diagram of a pre-charging device for a power battery according to an exemplary embodiment during pre-charging. As shown in fig. 2, the main circuit of the power battery is connected in parallel with several functional modules, namely a DCDC module, a micro control unit MCU module, a vehicle-mounted charger OBC module, and an air conditioning module, and each functional module has an equivalent capacitor connected to an input voltage. When the voltage output by the transformer is loaded into the functional modules, the voltage of the functional modules is close to the total voltage of the power battery, and the power battery is electrified after the pre-charging is finished.
A first voltage sampling point A is arranged between the positive output end of the transformer and the main positive relay, and a second voltage sampling point B is arranged between the negative output end of the transformer and the main negative relay. The first voltage sampling point A and the second voltage sampling point B are both connected with a battery management system BMS, and a voltage collector integrated in the BMS collects voltage. When the BMS judges that the collected voltage is in a preset threshold range (for example, reaches Ux 95 percent), a signal is sent to a VCU of the whole vehicle controller, the VCU controls the transformer to stop running, and the pre-charging is finished.
Fig. 3 is a flow chart of power battery power up according to an exemplary embodiment. As shown in fig. 3, when the power battery is ready to be powered on, the VCU sends a signal to the BMS, the BMS controls the power battery to perform low-voltage self-test, and after the self-test is completed, the total voltage U of the power battery is fed back to the VCU. At this time, the VCU can control the transformer to start working, and convert the 24V voltage output by the low-voltage battery into 0.95U voltage.
And then, closing a low-voltage main negative relay of the power battery, performing high-voltage self-inspection on the power battery, judging whether the pre-charging is finished by the BMS after the self-inspection is finished, and controlling the high-voltage main positive relay of the power battery to be closed if the pre-charging is finished.
Then, the VCU can control the DCDC module to realize high voltage to low voltage (from U to 24V), and when the VCU determines that the pre-charging is completed, the VCU controls the transformer to stop working and then starts driving.
In the embodiment of fig. 3, the pre-charging is started after the low-voltage self-test of the power battery, and in other embodiments, the pre-charging can be started at other times, for example, at the time of the high-voltage self-test and after the low-voltage main negative relay is closed. Therefore, the self-checking of the pre-charging and the power battery can be independently carried out, the pre-charging time can be flexibly adjusted, and the starting efficiency of the power battery is improved.
The present disclosure also provides a vehicle including the above-mentioned pre-charging device provided by the present disclosure.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (8)

1. The pre-charging device of the power battery is characterized by comprising a transformer and a low-voltage storage battery, wherein the input end of the transformer is connected with the low-voltage storage battery, the positive output end of the transformer is connected with the positive electrode of the power battery through a main positive relay, the negative output end of the transformer is connected with the negative electrode of the power battery through a main negative relay, and the transformer is used for boosting the voltage of the low-voltage storage battery and then outputting the boosted voltage.
2. The pre-charging apparatus according to claim 1, wherein the transformer is a DCDC converter.
3. The pre-charging apparatus according to claim 1, wherein the transformer is a DCDC bi-directional converter.
4. The pre-charging apparatus according to claim 1, wherein the transformer is a step-up transformer.
5. The pre-charging apparatus according to claim 1, further comprising:
one end of the voltage collector is connected between the positive output end of the transformer and the main positive relay, and the other end of the voltage collector is connected between the negative output end of the transformer and the main negative relay, and the voltage collector is used for collecting voltage in a power battery loop;
and the controller is respectively connected with the voltage collector and the control end of the transformer and is used for controlling the transformer to stop running when the voltage collected by the voltage collector is within a preset threshold range.
6. A pre-charging apparatus according to claim 5, wherein the controller is integrated in a vehicle controller of a vehicle.
7. A pre-charging apparatus according to claim 5, wherein the voltage collector is integrated in a battery management system of a vehicle.
8. A vehicle, characterized by comprising a pre-charging device according to any one of claims 1 to 7.
CN201921640160.7U 2019-09-27 2019-09-27 Pre-charging device of power battery and vehicle Active CN211493678U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921640160.7U CN211493678U (en) 2019-09-27 2019-09-27 Pre-charging device of power battery and vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921640160.7U CN211493678U (en) 2019-09-27 2019-09-27 Pre-charging device of power battery and vehicle

Publications (1)

Publication Number Publication Date
CN211493678U true CN211493678U (en) 2020-09-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201921640160.7U Active CN211493678U (en) 2019-09-27 2019-09-27 Pre-charging device of power battery and vehicle

Country Status (1)

Country Link
CN (1) CN211493678U (en)

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