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A charging control circuit for a dual-battery system electric vehicle and its control method

A battery system and charging control technology, applied in electric vehicle charging technology, battery/fuel cell control devices, electric vehicles, etc., can solve the problem that a single charging gun cannot charge each other in a dual-battery system, and reduce the number of indiscriminately inserted charging guns. Concerns about hidden dangers, the effect of enhancing safety

Active Publication Date: 2022-02-01
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a charging control circuit and a control method for a dual-battery system electric vehicle, by controlling the opening and closing sequences of different contactors in the first battery system controller and the second battery system controller to realize various charging control circuits. The charging method solves the defect that the single charging gun cannot charge each other between the dual battery systems, so that the user can charge the battery of the dual system only by inserting a charging gun, which improves the convenience and convenience of electric vehicle charging. Charging efficiency enhances user experience

Method used

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  • A charging control circuit for a dual-battery system electric vehicle and its control method
  • A charging control circuit for a dual-battery system electric vehicle and its control method
  • A charging control circuit for a dual-battery system electric vehicle and its control method

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Effect test

Embodiment 1

[0048] Embodiment 1: Charging the first battery system through the first charging port

[0049] see figure 2 , to charge the first battery system 4 through the first charging port 20, when the first charging port 20 is plugged with a charging gun, the first battery system BMS will send a power-on command after receiving the charging signal, forming the contactor of this charging circuit must be closed one by one. First close the main positive contactor 7 of the first battery system, and then close the negative charging contactor 3 of the first battery system and the positive charging contactor 2 of the first battery system in sequence. When the first battery system BMS receives the signal that the charging of the first battery 1 is completed or the charging signal disappears, it will issue a power-off command. In order to ensure the safety of the circuit, the contactor will be opened in the reverse order of closing. Therefore, the power-off procedure is as follows: the posi...

Embodiment 2

[0050] Embodiment 2: Charging the second battery system 19 through the first charging port 20

[0051] see image 3 , Figure 4. When the charging of the first battery 1 is completed and the charging gun is not pulled out, the first battery system BMS will send a signal that the charging of the first battery 1 is completed to the second battery system BMS. After the second battery system BMS communicates with the charger normally, The BMS of the second battery system will send a power-on command when detecting the charging signal, and the charging gun will charge the second battery 12 through the first charging port 20, and the contactors forming this charging circuit must be closed one by one, because the bridge circuit needs a second The pre-charging can only be completed when the battery 12 is supplied with electricity, so the main circuit contactor of the second battery system must be closed before the second battery 12 can supply electricity to the front end of the brid...

Embodiment 3

[0054] Embodiment 3: Charging the second battery system through the second charging port

[0055] see Figure 5 , when the charging gun is plugged into the second charging port, the BMS of the second battery system will issue a power-on command after receiving the charging signal, and the contactors forming the charging circuit must be closed one by one. The power-on process is as follows Figure 5 The sequence shown is: the main negative contactor 15 of the second battery system is closed, the charging negative contactor 17 of the second battery system is closed, and the positive charging contactor 16 of the second battery system is closed; when the second battery system BMS receives the second battery 12 When the signal of charging is completed or the charging signal disappears, a power-off command will be issued. The power-off process is as follows: Figure 5 The sequence shown is: the positive charging contactor 16 of the second battery system is disconnected, the negati...

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Abstract

A charging control circuit and control method for an electric vehicle with a dual-battery system, the circuit is to set a bridge contactor between the first battery system and the second battery system, and make the charging positive and negative contactors of the charging port respectively located in the battery system The two ends of the main positive contactor and the main negative contactor, so that when the first charging port charges the second battery or the second charging port charges the first battery, it is not necessary to close the main positive contactor and the main negative contactor of the battery system at the same time , to avoid the situation that the positive poles of the first battery and the second battery are connected to the positive poles, and the negative poles are connected to the negative poles, so as to avoid the mutual influence of the voltage difference between the first battery and the second battery. Through the control of the BMS, the first charging port or the second charging port can charge the second battery or the first battery after charging the battery to which it belongs. It reduces the user's worries about the hidden danger of plugging the charging gun indiscriminately, and enhances the safety of electric vehicle charging technology and the user's experience.

Description

technical field [0001] The invention relates to the technical field of pure electric vehicles, in particular to a charging control circuit and a control method for electric vehicles with a dual-battery system. Background technique [0002] In recent years, with the aggravation of environmental pollution and in response to the country's call, the number of electric vehicles has also increased. At present, most electric vehicles only use a set of independent battery systems. The number of electric vehicles equipped with dual-battery systems is still relatively rare, so the development of charging control technology for electric vehicles with dual-battery systems is still in its infancy. [0003] Compared with an independent single-battery system, a dual-battery system has many advantages. But at the same time, the corresponding charging control method will be much more complicated. At present, many large-scale electric commercial vehicles need to implement many functional mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L58/18B60L53/14
CPCB60L58/18B60L53/14Y02T10/70Y02T10/7072Y02T90/14
Inventor 贺林芮鹏程石琴
Owner HEFEI UNIV OF TECH