Uninterrupted alternating current charging control method for pure electric vehicle and electric vehicle

A technology of AC charging and control methods, applied in electric vehicles, electric vehicle charging technology, battery/fuel cell control devices, etc.

Active Publication Date: 2019-04-26

氢驰动力科技山西有限公司

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AI-Extracted Technical Summary

Problems solved by technology

[0009] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a method for uninterrupted AC charging control for pure electric ...

Abstract

The invention discloses an uninterrupted alternating current charging control method for a pure electric vehicle and the electric vehicle. The uninterrupted alternating current charging control methodfor the pure electric vehicle comprises the following steps: an on-board charger (OBC) simultaneously wakes-up battery management systems (BMS) in multiple battery packs which are connected in parallel on a bus; a vehicle control unit (VCU) reads state information of each of the battery packs from the bus and judges whether each of the battery packs meets a charging condition or not according tothe state information of each of the battery packs; and the battery packs are sequentially charged according to the preset charging sequence of the battery packs. According to the uninterrupted alternating current charging control method for the pure electric vehicle and the electric vehicle, the alternating current charging technology is applied to the pure electric vehicle with multiple power sources; in the charging process, in order to satisfy the user experience, the multiple power battery packs are sequentially subjected to alternating current charging without plugging and unplugging a charging gun again through signal interaction among the OBC, the VCU and the BMS of each of the battery packs.

Application Domain

Charging stationsElectric vehicle charging technology +2

Technology Topic

Electrical batteryPower battery +10

Image

Examples

Experimental program(1)

Example Embodiment

[0031] The following describes the implementation of the present invention through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and the features in the embodiments can be combined with each other if there is no conflict.

[0032] It should be noted that the illustrations provided in the following embodiments only illustrate the basic idea of the present invention in a schematic way. The figures only show the components related to the present invention instead of the number, shape and actual implementation of the components. For size drawing, the type, quantity, and proportion of each component can be changed at will during actual implementation, and the component layout type may also be more complicated.

[0033] This embodiment provides an uninterrupted AC charging control method for pure electric vehicles and electric vehicles, which are used to solve the problem of frequent plugging and unplugging of charging guns when charging multiple power battery packs in the prior art.

[0034] The following will describe in detail an uninterrupted AC charging control method for pure electric vehicles of the present invention and the principle and implementation of electric vehicles, so that those skilled in the art can understand the present invention for pure electric vehicles without creative work. Uninterrupted AC charging control method and electric vehicle.

[0035] Such as figure 1 As shown, the uninterrupted AC charging control method for pure electric vehicles provided in this embodiment includes:

[0036] Step S110, the on-board charger simultaneously wakes up the battery management systems in multiple battery packs connected in parallel on the bus;

[0037] Step S120: The vehicle controller reads the state information of each battery pack from the bus, and judges whether each battery pack meets the charging condition according to the state information of each battery pack;

[0038] In step S130, each battery pack is sequentially charged according to the preset charging sequence of each battery pack.

[0039] Such as figure 2 As shown, in this embodiment, it is shown as an example of a connection relationship between each battery pack and an onboard charger (OBC, On BoardCharger) and a vehicle controller (VCU, Vehicle Control Unit).

[0040] Wherein, the battery packs are connected in parallel on the bus, and each battery pack has a corresponding Battery Management System (BMS), and the on-board charger and the vehicle controller are also connected to the bus. Wherein, the on-board charger is respectively connected to each battery pack, and the battery management system (BMS) in each battery pack is simultaneously awakened through the on-board charger (OBC) hard-wire wake-up signal.

[0041] Wherein, the bus is preferably a CAN bus.

[0042] The vehicle controller (VCU) judges whether one or more battery packs meet the charging requirements according to the status information of each battery pack on the bus. According to the control strategy, for example, according to the agreed charging sequence, first give A package, then B package and finally C The battery pack is charged. If a battery pack does not meet the charging conditions, it will be automatically skipped and charged in the order described above. During the charging process, in order to meet the user experience, through the signal interaction of the on-board charger (OBC), the vehicle controller (VCU), and each battery management system (BMS), it is possible to continuously charge the battery without re-plugging the charging gun. Three battery packs are charged.

[0043] The following is a detailed description of the uninterrupted AC charging control method for pure electric vehicles in this embodiment.

[0044] Specifically, in this embodiment, when the charging gun is inserted into the on-board charger, the on-board charger simultaneously wakes up the battery management system in multiple battery packs connected in parallel on the bus.

[0045] In this embodiment, such as image 3 As shown, the uninterrupted AC charging control method for pure electric vehicles further includes:

[0046] Step S111: After the battery management system in the battery pack is awakened, the battery management system detects and acquires the state information corresponding to the battery pack, and sends the state information of the battery pack to the bus for the Read by the vehicle controller.

[0047] Step S112, the battery management system in each battery pack receives a charging permission instruction from the vehicle controller, and upon receiving the charging permission instruction, sends a power-on request to the vehicle controller;

[0048] Step S113: The battery management system in each battery pack sends a charging request current and a charging request voltage to the on-board charger according to the maximum allowable charging current and voltage sent by the on-board charger.

[0049] Such as Figure 5 As shown, suppose there are three battery packs, A battery pack, B battery pack and C battery pack. When charging is inserted, the battery management systems BMSA, BMSB and BMSC corresponding to battery pack A, battery pack B and battery pack C are awakened. Then, the battery management systems BMSA, BMSB and BMSC perform self-checks. If the self-checks are successful, they continue to check to obtain the state information corresponding to the battery pack and check whether the battery pack is allowed to charge information, and compare the state information of the battery pack and whether it is allowed The charging information is sent to the bus for the vehicle controller to read.

[0050] After that, like Image 6 As shown, the vehicle controller (VCU) obtains the status information of the three battery packs, and sends a charging enable command according to the battery pack status, and the battery management system in each battery pack waits for the vehicle controller (VCU) Receiving a charging permission instruction, and when receiving the charging permission instruction, continue to send a power-on request to the vehicle controller.

[0051] Wherein, before sending the power-on request to the vehicle controller, it also includes confirming whether the level state of the battery pack exists, that is, confirming CC (high level) and CP (low level), and confirming CC (high level). After leveling) and CP (low level), judge whether CC (high level) and CP (low level) are normal. When CC (high level) and CP (low level) are normal, then adjust The vehicle controller sends a power-on request, that is, sends a high-voltage request command to the vehicle controller.

[0052] In this embodiment, the maximum allowable charging current and voltage sent by the on-board charger to each battery pack, and the battery management system in each battery pack, according to the maximum allowable charging current and voltage sent by the on-board charger, The on-board charger sends the charging request current and the charging request voltage, and then waits to receive the vehicle controller (VCU) feedback power-on command, that is, feeds back the high-voltage command, and determines whether to continue the subsequent charging process according to whether the high-voltage command is received. If the power-on instruction from the vehicle controller (VCU) is not received within the preset time, it is determined as a timeout, and the timeout fault is reported to the battery management system.

[0053] In this embodiment, such as Figure 4 As shown, the sequentially charging each of the battery packs according to the preset charging sequence of each of the battery packs includes:

[0054] In step S114, when the vehicle controller determines that the battery pack satisfies the charging condition according to the state information of the battery pack, it sends the charging permission instruction to the corresponding battery management system according to a preset charging sequence.

[0055] Wherein, in this embodiment, when the battery pack does not meet the charging condition, the charging permission instruction is sent to the corresponding battery management system according to the sequence after skipping the battery pack in the preset charging sequence.

[0056] For example, when battery pack A, battery pack B and battery pack C are all allowed to be charged, the order of charging is A-> B-> C. If there is a battery pack that cannot be charged or stopped due to a fault, skip and continue charging in the previous order.

[0057] Step S115: The battery management system that has received the charge permission instruction sends a charge request instruction to the on-board charger.

[0058] Among them, in the continuous charging stage, it is necessary to ensure that the on-board charger (OBC) continues to receive charging instructions to ensure that the on-board charger (OBC) is in a standby state.

[0059] In step S116, the battery management system starts precharging after receiving the power-on instruction fed back by the vehicle control.

[0060] In this embodiment, when one of the battery packs is fully charged, the vehicle controller will allow the next battery pack to meet the charging conditions only when it determines that the bus voltage tends to 0V and the main relay of the fully charged battery pack is disconnected. The battery management system of the battery pack sends the charge permission instruction.

[0061] After the pre-charging starts, in this embodiment, as Figure 7 As shown, the uninterrupted AC charging control method for pure electric vehicles further includes:

[0062] Step S131: It is detected whether the pre-charging is successful.

[0063] Step S132, when the pre-charging is successful, the battery management system controls the relay of the corresponding battery pack to pull in;

[0064] Step S133: The battery management system sends a charging request current and a charging request voltage to the on-board charger according to the battery pack status, sends a power-on request to the vehicle controller, and continuously sends a charging request instruction to the on-board charger After receiving the power-on permission instruction of the vehicle control feedback, continue to receive the supply current from the on-board charger to charge the battery pack.

[0065] Such as Figure 8 As shown, when detecting whether the pre-charging is successful, if the current battery pack fails to pre-charge, the fault is reported, and the subsequent charging steps of the single-pack battery pack are suspended, and the charging process of the next battery pack is continued, that is, the above-mentioned pre-charging process is repeated. During the charging process, when the pre-charging is successful, the main relay that controls the battery pack is switched on.

[0066] Then, according to the state of the battery pack, it sends a request current to the on-board charger, and continuously checks whether the battery pack is full, and whether there is a charging abort fault light.

[0067] If the current battery pack is fully charged, send a high voltage request instruction to stop charging to the vehicle controller, and then wait for the vehicle controller to feed back the high voltage instruction.

[0068] Among them, before receiving the power-off instruction issued by the vehicle controller feedback, continue to send charging instructions to the on-board charger, that is, as described above, it is necessary to ensure that the on-board charger (OBC) continues to receive during the continuous charging phase. To the charging command, ensure that the on-board charger (OBC) is in standby.

[0069] In this embodiment, when the power-off instruction issued by the vehicle controller is not received for more than a preset time, the waiting timeout expires, the relay that controls the battery pack is turned off, and the charging of the battery pack is stopped.

[0070] In this embodiment, when the power-off instruction issued by the vehicle controller is received within the preset time, the relay that controls the battery pack is turned off, stops charging the battery pack, and repeats the above During the process, continue to charge the next battery pack, so that multiple battery packs can be continuously charged without re-plugging the charging gun.

[0071] An embodiment of the present invention also provides an electric vehicle, which is charged by applying the above-mentioned uninterrupted AC charging control method for a pure electric vehicle. The above-mentioned uninterrupted AC charging control method for pure electric vehicles has been described in detail, and will not be repeated here.

[0072] Wherein, the electric vehicle is a pure electric vehicle, such as figure 2 As shown, the display is an example of a connection relationship between each battery pack in the electric vehicle, an on-board charger (OBC, On Board Charger), and a vehicle controller (VCU, Vehicle Control Unit).

[0073] Wherein, the battery packs are connected in parallel on the bus, and each battery pack has a corresponding Battery Management System (BMS), and the on-board charger and the vehicle controller are also connected to the bus. Wherein, the on-board charger is respectively connected to each battery pack, and the battery management system (BMS) in each battery pack is simultaneously awakened through the on-board charger (OBC) hard-wire wake-up signal.

[0074] Wherein, the bus is preferably a CAN bus.

[0075] The vehicle controller (VCU) judges whether one or more battery packs meet the charging requirements according to the status information of each battery pack on the bus. According to the control strategy, for example, according to the agreed charging sequence, first give A package, then B package and finally C The battery pack is charged. If a battery pack does not meet the charging conditions, it will be automatically skipped and charged in the order described above. During the charging process, in order to meet the user experience, through the signal interaction of the on-board charger (OBC), the vehicle controller (VCU), and each battery management system (BMS), it is possible to continuously charge the battery without re-plugging the charging gun. Three battery packs are charged.

[0076] In summary, the present invention applies AC charging technology to pure electric vehicles with multiple power sources. During the charging process, in order to satisfy the user experience, through OBC (on-board charger), VCU (complete vehicle controller) and the battery pack The signal interaction of BMS (Battery Management System) realizes AC charging of multiple power battery packs in sequence without re-plugging the charging gun. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial value.

[0077] The above-mentioned embodiments only exemplarily illustrate the principles and effects of the present invention, but are not used to limit the present invention. Anyone familiar with this technology can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the present invention should still be covered by the claims of the present invention.

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