CN-118219923-B - Charging protection system, rail vehicle and charging system

CN118219923BCN 118219923 BCN118219923 BCN 118219923BCN-118219923-B

Abstract

A charging protection system, a railway vehicle and a charging system comprise a whole vehicle control unit, a first battery management controller, a second battery management controller and a first battery management controller, wherein the whole vehicle control unit is used for sending a charging command, the first battery management controller is used for receiving, forwarding and responding to the charging command to control the suction of a charging positive electrode contactor and a charging negative electrode contactor, the second battery management controller is used for receiving and responding to the charging command forwarded by the first battery management controller to control the suction of the battery contactors, the first battery management controller is further used for controlling the disconnection of the charging positive electrode contactor and the charging negative electrode contactor after determining that a battery reaches a full condition, and/or the second battery management controller is further used for controlling the disconnection of the battery contactors after determining that the battery reaches the full condition. The system avoids the problem that the battery is overcharged due to the fact that a single battery management controller or a contactor fails and cannot be disconnected, and improves the safety redundancy of the system.

Inventors

LI TAO
TAN ZHICHENG
ZHANG XIN
GUO MINGYANG
SU DAN

Assignees

比亚迪股份有限公司

Dates

Publication Date: 20260505
Application Date: 20230831

Claims (11)

1. A charge protection system, the system comprising: The whole vehicle control unit is used for sending a charging command; The first battery management controller is used for receiving, forwarding and responding to the charging command so as to control the suction of a charging positive electrode contactor and a charging negative electrode contactor, and the charging positive electrode contactor and the charging negative electrode contactor are arranged in a high-voltage distribution box; The second battery management controller is used for receiving and responding to the charging command forwarded by the first battery management controller so as to control the suction of a battery contactor, and the battery contactor is arranged in a maintenance switch; The first battery management controller is also used for controlling the disconnection of the charging positive electrode contactor and the charging negative electrode contactor after the battery full information is determined to be collected; Wherein, the first battery management controller controls the disconnection of the charging positive electrode contactor and the charging negative electrode contactor and the second battery management controller controls the disconnection of the battery contactor to be independent operations.
2. The charge protection system of claim 1, wherein the vehicle control unit is further configured to determine whether a charge request is received and send a prepare-to-charge command to the first battery management controller based on the charge request; The first battery management controller is further used for determining whether a charging preparation command sent by the whole vehicle control unit is received or not, receiving battery electric quantity information sent by the second battery management controller and sending the battery electric quantity information to the whole vehicle control unit based on the charging preparation command, and determining whether the battery electric quantity information sent by the first battery management controller is received or not and sending the charging command to the first battery management controller based on the battery electric quantity information.
3. The charge protection system of claim 1, wherein the first battery management controller is further configured to: And sending a charging instruction to a direct-current charger based on the charging command, determining whether first charging readiness information sent by the direct-current charger is received, and controlling the suction of the charging negative electrode contactor and the charging positive electrode contactor based on the first charging readiness information.
4. The charge protection system of claim 3, wherein the first battery management controller is further configured to: And determining whether second charging readiness information sent by the second battery management controller is received or not, and controlling the suction of the charging negative electrode contactor and the suction of the charging positive electrode contactor based on the second charging readiness information.
5. The charge protection system of claim 3, wherein the first battery management controller is further configured to: And after the charging positive electrode contactor and the charging negative electrode contactor are controlled to be disconnected, sending charging end information to the direct-current charger so that the direct-current charger stops outputting power to a charging loop based on the charging end information.
6. The charge protection system of claim 5, wherein the battery is configured to provide the battery with the power source, The first battery management controller is further configured to receive charger disconnection information from the direct current charger after transmitting charging end information to the direct current charger, and transmit the charger disconnection information to the second battery management controller; the second battery management controller is further configured to determine whether charging end information sent by the first battery management controller is received, and control the battery contactor to be disconnected based on the charging end information.
7. The charge protection system of claim 5, wherein the battery is configured to provide the battery with the power source, The first battery management controller is further configured to receive charger disconnection information from the direct current charger after sending charging end information to the direct current charger, and send the charger disconnection information to the whole vehicle control unit; The whole vehicle control unit is further used for determining whether charging end information sent by the first battery management controller is received or not, and sending the charging end information to the whole vehicle based on the charging end information.
8. The charge protection system of any of claims 1-7, wherein the battery full information includes a battery state of charge reaching a first preset threshold and/or a highest cell voltage reaching a second preset threshold.
9. The charge protection system of claim 8, wherein the first preset threshold is 100% and the second preset threshold is 3.6V.
10. A rail vehicle comprising a charge protection system according to any one of claims 1-9.
11. A charging system comprising a dc charger, a battery and the charge protection system of any one of claims 1-9, wherein: A first battery management controller in the charging protection system is connected with a charging positive electrode contactor, a charging negative electrode contactor and the direct current charger; A second battery management controller in the charging protection system is connected with the first battery management controller and a battery contactor; The direct current charger is connected to the positive electrode of the battery via the charging positive electrode contactor and the battery contactor, and the direct current charger is connected to the negative electrode of the battery via the charging negative electrode contactor.

Description

Charging protection system, rail vehicle and charging system Technical Field The application relates to the technical field of rail transit, in particular to a charging protection system, a rail vehicle and a charging system. Background With the rapid development of electric vehicles, rail vehicles are increasingly being widely used as an environment-friendly and efficient vehicle. In order to meet the power demand of rail vehicles, battery packs are an important component of electric vehicles, which require periodic charging to ensure their proper operation. However, if the management and protection measures are not proper during the charging process, the problems of overcharge, overdischarge, abnormal temperature and the like of the battery may be caused, thereby affecting the service life of the battery and the safety of the vehicle. The existing charging protection system only has one battery management controller for protection, and when the controller fails, the battery charging protection function also fails, and the battery can be overcharged. Disclosure of Invention The present application has been made in order to solve at least one of the above problems. According to one aspect of the application, a charging protection system is provided, which comprises a whole vehicle control unit, a first battery management controller, a second battery management controller and a first battery management controller, wherein the whole vehicle control unit is used for sending a charging command, the first battery management controller is used for receiving, forwarding and responding to the charging command to control the suction of a charging positive electrode contactor and a charging negative electrode contactor, the second battery management controller is used for receiving and responding to the charging command forwarded by the first battery management controller to control the suction of the battery contactor, the first battery management controller is further used for controlling the disconnection of the charging positive electrode contactor and the charging negative electrode contactor after the collection of battery full information is determined, and/or the second battery management controller is further used for controlling the disconnection of the battery contactor after the collection of the battery full information is determined. The vehicle control unit is further used for determining whether a charging request is received and sending a charging preparation command to the first battery management controller based on the charging request, the first battery management controller is used for determining whether the charging preparation command sent by the vehicle control unit is received and receiving battery electric quantity information sent by the second battery management controller and sending the battery electric quantity information to the vehicle control unit based on the charging preparation command, and the vehicle control unit is further used for determining whether the battery electric quantity information sent by the first battery management controller is received and sending the charging command to the first battery management controller based on the battery electric quantity information. The first battery management controller is further configured to send a charging instruction to a direct current charger based on the charging command, determine whether first charging readiness information sent by the direct current charger is received, and control the charging negative contactor and the charging positive contactor to engage based on the first charging readiness information. The first battery management controller is also illustratively configured to determine whether second charge-ready information sent by the second battery management controller is received and to control actuation of the charge negative contactor and the charge positive contactor based on the second charge-ready information. The first battery management controller is also configured to send charge end information to the dc charger after controlling the charge positive contactor and the charge negative contactor to open, such that the dc charger stops outputting power to the charging circuit based on the charge end information. The first battery management controller is further configured to receive charger disconnect information from the dc charger after transmitting charge end information to the dc charger, and transmit the charger disconnect information to the second battery management controller; the second battery management controller is further configured to determine whether charging end information sent by the first battery management controller is received, and control the battery contactor to be disconnected based on the charging end information. The first battery management controller is further used for receiving charger disconnection information from the direct-current charger and sending the charger di