European standard and national standard compatible alternating current charging method and system

Abstract

The invention discloses an European standard and national standard compatible alternating current charging method and system, and relates to the technical field of electric vehicle charging, and the method comprises the steps that a battery BMS determines to enter an European standard alternating current charging process or a national standard alternating current charging process based on a received first external signal; wherein the first external signal is an alternating current charging signal provided by an electric vehicle charging communication controller EVCC, a PP signal provided by a European standard alternating current charging pile or a gun insertion signal provided by a vehicle-mounted charger OBC; and / or the OBC determines to enter the European standard alternating current charging process or the national standard alternating current charging process based on the received signal provided by the national standard or European standard alternating current charging pile. No matter the European-standard AC charging pile or the national-standard AC charging pile is adopted, the type of the charging pile can be identified, and a corresponding charging process is entered, so that European-standard and national-standard compatible AC charging is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle charging, and in particular to an alternating current charging method and system compatible with European and national standards. Background Art

[0002] At present, some battery BMS and on-board charger OBC on the market meet the national standard requirements, while some battery BMS and on-board charger OBC meet the European standard requirements. The two are not compatible. For example, when the national standard version of OBC interacts with the European standard AC charging pile, it cannot be recognized due to the lack of CC and CP signals, so it cannot charge. In this way, for owners of national standard electric vehicles or European standard electric vehicles, they still need to spend time looking for an AC charging pile that suits them, which delays their travel. Manufacturers also hope that the batteries and on-board charger OBCs they develop can meet both national standard charging and European standard charging. Therefore, the market is in urgent need of an AC charging method that is compatible with both national and European standards. Summary of the invention

[0003] In view of the above problems and technical requirements, the inventors have proposed an AC charging method and system compatible with European and national standards. The technical solution of the present invention is as follows:

[0004] In a first aspect, the present application provides a European standard and national standard compatible AC charging method, comprising the following steps:

[0005] The battery BMS determines to enter the European standard AC charging process or the national standard AC charging process based on the received first external signal;

[0006] The first external signal is an AC charging signal provided by an electric vehicle charging communication controller EVCC, a PP signal provided by a European standard AC charging pile, or a plug-in signal provided by an on-board charger OBC;

[0007] and / or,

[0008] The on-board charger OBC determines whether to enter the European standard AC charging process or the national standard AC charging process based on the signal provided by the national standard or European standard AC charging pile.

[0009] A further technical solution is that the battery BMS determines to enter the European standard AC charging process or the national standard AC charging process based on the received first external signal, including:

[0010] When the BMS receives the AC charging signal provided by the EVCC or the PP signal provided by the European standard AC charging pile, it enters the European standard AC charging process;

[0011] When BMS receives the gun plug signal provided by OBC, it enters the national standard AC charging process.

[0012] A further technical solution is that the on-board charger OBC determines whether to enter the European standard AC charging process or the national standard AC charging process based on the received signal provided by the national standard or European standard AC charging pile, including:

[0013] When OBC only receives the AC voltage signal provided by the European standard AC charging pile, it enters the European standard AC charging process;

[0014] When OBC receives the CC signal provided by the national standard AC charging pile, it enters the national standard AC charging process.

[0015] A further technical solution is that the method for EVCC to provide an AC charging signal includes:

[0016] When the EVCC detects the CP signal provided by the European standard AC charging pile, it is awakened and sends an AC charging signal to the BMS.

[0017] A further technical solution is that the method for OBC to provide a gun insertion signal includes:

[0018] When OBC detects the CC signal provided by the national standard AC charging pile, it sends a plug-in signal to the BMS. The plug-in signal includes the CC signal, CP signal and AC voltage signal provided by the national standard AC charging pile.

[0019] Its further technical solution is that the European standard AC charging process includes:

[0020] The BMS sends a request to the EVCC to close the charging gun electronic lock and the AC output switch S2 of the European standard charging pile;

[0021] Based on the AC charging signal provided by the EVCC and the AC voltage provided by the OBC, the BMS generates a charging request signal to the OBC, thereby performing European standard AC charging;

[0022] When charging is completed or abnormal, the BMS disconnects the positive pole of the fast charging relay and sends a request to the EVCC to disconnect the electronic lock of the charging gun and the AC output switch S2 of the European standard charging pile.

[0023] Its further technical solution is that the European standard AC charging process also includes:

[0024] OBC enters standby mode and sends AC voltage to BMS;

[0025] When OBC receives the charging request signal from BMS, it performs European standard AC charging.

[0026] A further technical solution is that the method for the BMS to generate a charging request signal includes:

[0027] The AC charging signal provided by EVCC contains AC current, and the charging power is obtained based on the AC current and AC voltage;

[0028] Obtaining a DC charging current based on the charging power and the required DC charging voltage;

[0029] The DC charging voltage and the DC charging current are combined to obtain a charging request signal.

[0030] Its further technical solution is that the national standard AC charging process includes:

[0031] BMS sends a charging request signal to OBC, thereby performing national standard AC charging;

[0032] When charging is completed or abnormal, the BMS disconnects the positive pole of the fast charging relay and sends a charging end signal to the OBC.

[0033] In the second aspect, the present application also provides an AC charging system compatible with European and national standards, including a battery BMS, an electric vehicle charging communication controller EVCC and an on-board charger OBC connected to the BMS;

[0034] When BMS interacts with EVCC and OBC, the steps of the European and national standards compatible AC charging method as described in the first aspect are implemented.

[0035] The beneficial technical effects of the present invention are:

[0036] By adopting the European and national standard compatible AC charging method and system provided in this application, whether using a European standard AC charging pile or a national standard AC charging pile, the system can identify the type of charging pile and enter the corresponding charging process, thereby realizing European and national standard compatible AC charging, facilitating product normalization, platformization, and scale, greatly reducing costs and improving resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the European and national standard compatible AC charging method provided by this application.

[0038] Figure 2 This is a schematic diagram of the European standard AC charging process provided by this application.

[0039] Figure 3 This is a schematic diagram of the national standard AC charging process provided by this application. DETAILED DESCRIPTION

[0040] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0041] In one embodiment, the present application provides a European standard and national standard compatible AC charging method, please refer to Figure 1As shown, when the method is based on the battery BMS as the main body, it includes: the battery BMS determines to enter the European standard AC charging process or the national standard AC charging process based on the received first external signal. Among them, the first external signal is the AC charging signal provided by the electric vehicle charging communication controller EVCC, the PP signal provided by the European standard AC charging pile, or the plug-in signal provided by the on-board charger OBC. When the method is based on the on-board charger OBC as the main body, it includes: the on-board charger OBC determines to enter the European standard AC charging process or the national standard AC charging process based on the received signal provided by the national standard or European standard AC charging pile. When the method interacts with BMS and OBC, it also includes the method steps executed by the above two main bodies.

[0042] Combination Figure 2 As shown, when the BMS receives the AC charging signal provided by the EVCC or the PP signal provided by the European standard AC charging pile, it enters the European standard AC charging process. Specifically, when using the European standard AC charging pile to plug in the gun, the European standard AC charging pile will provide a CP signal, a PP signal, and an AC voltage signal, wherein the CP signal interacts with the EVCC, the PP signal interacts with the BMS, and the AC voltage signal interacts with the OBC. The OBC interacts with the BMS through CAN communication, and the EVCC interacts with the BMS through CAN communication. Therefore, when the EVCC detects the CP signal provided by the European standard AC charging pile, it is awakened and sends an AC charging signal to the BMS, which contains an AC current. In the European standard AC charging process, the BMS sends a request to the EVCC to close the charging gun electronic lock and the AC output switch S2 of the European standard charging pile. The BMS generates a charging request signal to the OBC based on the AC charging signal provided by the EVCC and the AC voltage provided by the OBC, thereby performing European standard AC charging. When charging is completed or abnormal, the BMS disconnects the positive pole of the fast charging relay and sends a request to the EVCC to disconnect the charging gun electronic lock and the AC output switch S2 of the European standard charging pile. Abnormal conditions may include loss of AC charging signal or OBC failure.

[0043] The BMS generates a charging request signal according to the AC charging signal provided by the EVCC and the AC voltage provided by the OBC, specifically including: the BMS multiplies the AC current provided by the EVCC and the AC voltage provided by the OBC to obtain the charging power, divides the charging power by the required DC charging voltage to obtain the DC charging current, and combines the DC charging voltage and the DC charging current to obtain the charging request signal.

[0044] Combination Figure 3As shown, when BMS receives the gun plug signal provided by OBC, it enters the national standard AC charging process. Specifically, when using the national standard AC charging pile to plug the gun, the national standard AC charging pile will provide CC signal, CP signal, and AC voltage signal. These three signals interact with OBC, and OBC interacts with BMS through CAN communication. Therefore, when OBC detects the CC signal provided by the national standard AC charging pile, it sends a gun plug signal to BMS. The gun plug signal contains the CC signal, CP signal and AC voltage signal provided by the national standard AC charging pile. In the national standard AC charging process, BMS sends a charging request signal to OBC, so as to perform national standard AC charging. When charging is completed or abnormal, BMS disconnects the positive pole of the fast charging relay and sends a charging end signal to OBC. Abnormal conditions may include the loss of the gun plug signal or OBC failure.

[0045] Combination Figure 2 As shown, when the OBC only receives the AC voltage signal provided by the European standard AC charging pile, it enters the European standard AC charging process. Specifically, when using the European standard AC charging pile plug, the OBC detects that the AC voltage signal provided by the European standard AC charging pile is awakened when the vehicle is not powered on, or after the vehicle is powered on and the OBC wakes up, it detects the AC voltage signal provided by the European standard AC charging pile and there is no CC signal, then it enters the European standard AC charging process. In the European standard AC charging process, the OBC enters the standby state and sends the AC voltage to the BMS. When the OBC receives the charging request signal provided by the BMS, it performs European standard AC charging according to the DC charging current and voltage values ​​in the charging request signal.

[0046] Combination Figure 3 As shown, when OBC receives the CC signal provided by the national standard AC charging pile, it enters the national standard AC charging process. Specifically, when using the national standard AC charging pile to plug in the gun, the OBC detects the CC signal provided by the national standard AC charging pile when the vehicle is not powered on, or after the vehicle is powered on and the OBC wakes up, it detects the CC signal provided by the national standard AC charging pile. At this time, regardless of whether there is an AC voltage signal provided by the charging pile, the national standard AC charging process is entered. In the national standard AC charging process, the OBC sends a gun plug signal to the BMS after self-checking. When the OBC receives the charging request signal provided by the BMS, national standard AC charging is performed.

[0047] Based on the same inventive concept, in another embodiment, the present application also provides a European standard and national standard compatible AC charging system, which includes a battery BMS and an electric vehicle charging communication controller EVCC and an on-board charger OBC connected to the BMS. When the BMS interacts with the EVCC and the OBC, the steps of the above-mentioned European standard and national standard compatible AC charging method are implemented. Since the implementation solution provided by the system to solve the problem is similar to the implementation solution recorded in the above-mentioned method, the specific limitations of the European standard and national standard compatible AC charging system can be found in the above-mentioned limitations on the European standard and national standard compatible AC charging method, which will not be repeated here.

[0048] The above is only a preferred embodiment of the present application, and the present invention is not limited to the above embodiments. It is understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included in the protection scope of the present invention.

Claims

1. A European standard and national standard compatible AC charging method, characterized in that: The method comprises: The battery BMS determines to enter the European standard AC charging process or the national standard AC charging process based on the received first external signal; The first external signal is an AC charging signal provided by an electric vehicle charging communication controller EVCC, a PP signal provided by a European standard AC charging pile, or a plug-in signal provided by an on-board charger OBC; and / or, The on-board charger OBC determines whether to enter the European standard AC charging process or the national standard AC charging process based on the signal provided by the national standard or European standard AC charging pile.

2. The European and national standards compatible AC charging method according to claim 1, characterized in that: The battery BMS determines to enter the European standard AC charging process or the national standard AC charging process based on the received first external signal, including: When the BMS receives the AC charging signal provided by the EVCC or the PP signal provided by the European standard AC charging pile, it enters the European standard AC charging process; When the BMS receives the plug-in signal provided by the OBC, it enters the national standard AC charging process.

3. The European and national standards compatible AC charging method according to claim 1, characterized in that: The on-board charger OBC determines to enter the European standard AC charging process or the national standard AC charging process based on the received signal provided by the national standard or European standard AC charging pile, including: When the OBC receives only the AC voltage signal provided by the European standard AC charging pile, it enters the European standard AC charging process; When the OBC receives the CC signal provided by the national standard AC charging pile, it enters the national standard AC charging process.

4. The European and national standards compatible AC charging method according to claim 2, characterized in that: The methods by which EVCC provides AC charging signals include: When the EVCC detects the CP signal provided by the European standard AC charging pile, it is awakened and sends an AC charging signal to the BMS.

5. The European and national standards compatible AC charging method according to claim 2, characterized in that: The methods by which OBC provides a gun insertion signal include: When the OBC detects the CC signal provided by the national standard AC charging pile, it sends a gun plug signal to the BMS, where the gun plug signal includes the CC signal, CP signal and AC voltage signal provided by the national standard AC charging pile.

6. The European and national standards compatible AC charging method according to claim 2, characterized in that: The European standard AC charging process includes: The BMS sends a request to the EVCC to close the charging gun electronic lock and the AC output switch S2 of the European standard charging pile; The BMS generates a charging request signal to the OBC according to the AC charging signal provided by the EVCC and the AC voltage provided by the OBC, thereby performing European standard AC charging; When charging is completed or abnormal, the BMS disconnects the positive pole of the fast charging relay and sends a request to the EVCC to disconnect the electronic lock of the charging gun and the AC output switch S2 of the European standard charging pile.

7. The European and national standards compatible AC charging method according to claim 3, characterized in that: The European standard AC charging process also includes: The OBC enters a standby state and sends an AC voltage to the BMS; When the OBC receives the charging request signal provided by the BMS, it performs European standard AC charging.

8. The European and national standards compatible AC charging method according to claim 6, characterized in that: The method for BMS to generate a charging request signal includes: The AC charging signal provided by the EVCC includes an AC current, and the charging power is obtained based on the AC current and the AC voltage; Obtaining a DC charging current based on the charging power and the required DC charging voltage; The DC charging voltage and the DC charging current are combined to obtain a charging request signal.

9. The European and national standards compatible AC charging method according to claim 2, characterized in that: The national standard AC charging process includes: The BMS sends a charging request signal to the OBC, thereby performing national standard AC charging; When charging is completed or abnormal, the BMS disconnects the positive pole of the fast charging relay and sends a charging end signal to the OBC.

10. An AC charging system compatible with European and national standards, characterized in that: It includes a battery BMS and an electric vehicle charging communication controller EVCC and an on-board charger OBC connected to the BMS; When the BMS interacts with the EVCC and the OBC, the steps of the European and national standard compatible AC charging method as described in any one of claims 1 to 9 are implemented.

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