CN216216054U

CN216216054U - Vehicle-mounted standby power supply system

Info

Publication number: CN216216054U
Application number: CN202122385116.XU
Authority: CN
Inventors: 马世伟; 石运泰; 张洋清; 任强
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2021-09-29
Filing date: 2021-09-29
Publication date: 2022-04-05
Anticipated expiration: 2031-09-29

Abstract

The utility model provides a vehicle-mounted standby power supply system, wherein the system comprises: the system comprises a discharge positive electrode port, a discharge relay, a charge relay, a lithium battery pack, a charge and discharge negative electrode port, a battery management system, an antenna, a self-locking relay, a first switch, a second switch, a first diode and a second diode; wherein the cathode of the first diode is connected with the cathode of the second diode. This application adopts charge relay, discharge relay and first diode, second diode protection circuit, compares in only a relay, when the battery is full of electricity, the disconnection of charge relay, if when this moment need supply power to the consumer, the electric current that the lithium cell group provided can directly supply power to the consumer through first diode, discharge relay, avoids needing the artifical problem that can just supply power to the consumer of restarting the reserve power supply system of whole car.

Description

Vehicle-mounted standby power supply system

Technical Field

The utility model relates to the technical field of power supply, in particular to a vehicle-mounted standby power supply system.

Background

With the continuous development of economic level, automobiles as main vehicles rapidly enter people's lives. The automobile generator is a main power supply of an automobile and has the function of supplying power to all electric equipment (except a starter) in the automobile when an engine runs normally. When the automobile stops running (i.e. the automobile stops in a flameout state), the engine stops supplying power to the electric equipment in the automobile, and at the moment, the standby power supply in the automobile needs to be used for supplying power to the electric equipment of the whole automobile.

Among the prior art, when using the lithium cell to supply power to the consumer of whole car, use a relay to protect the circuit usually, when charging and being full of the electricity to the lithium cell promptly, the relay disconnection in the circuit to the protection lithium cell prevents overcharge. At this moment, if the lithium battery is needed to discharge, namely, when the power supply is carried out on the electric equipment, the whole-vehicle standby power supply system needs to be restarted manually.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present invention is to provide a vehicle-mounted standby power supply system, so as to avoid the problem that when a battery is fully charged and a relay is disconnected, the whole vehicle standby power supply system needs to be manually restarted to supply power to a power consumption device.

In a first aspect, an embodiment of the present invention provides a vehicle-mounted standby power supply system, including: the system comprises a charge-discharge positive electrode port, a discharge relay, a charge relay, a lithium battery pack, a charge-discharge negative electrode port, a battery management system, an antenna, a self-locking relay, a first switch, a second switch, a first diode and a second diode; wherein the cathode of the first diode is connected with the cathode of the second diode;

the charging and discharging positive electrode port is electrically connected with the charging equipment positive electrode port and the electric equipment positive electrode port; the charging and discharging negative electrode port is electrically connected with the charging equipment negative electrode port and the electric equipment negative electrode port;

the charge and discharge positive electrode port, the discharge relay, the charge relay, the lithium battery pack and the charge and discharge negative electrode port are connected in series;

the anode of the first diode is connected between the lithium battery pack and the charging relay, the cathodes of the first diode and the second diode are connected between the charging relay and the discharging relay, and the anode of the second diode is connected between the discharging relay and the charging and discharging anode port;

the lithium battery pack, the first diode, the first switch, the second switch and the battery management system are connected in series; wherein the first switch connects the cathodes of the first and second diodes;

the lithium battery pack, the first diode, the first switch, the latching relay and the battery management system are connected in series;

the battery management system is respectively connected with the lithium battery pack, the charge and discharge negative electrode port, the antenna, the self-locking relay, the charge relay and the discharge relay; a first negative power supply port of the battery management system is connected with the charge and discharge negative port; the antenna is used for sending the information detected by the battery management system to a cloud platform.

With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the method further includes: a connector;

the connector is connected between the first switch and the cathodes of the first diode and the second diode; the connector is connected between the second switch and the battery management system; the connectors are connected between the first switch, the second switch and the self-locking relay.

With reference to the first possible implementation manner of the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where the latching relay includes a first power-on port, a second power-on port, a first enable port, and a second enable port;

a first pin of the connector is connected with the cathodes of the first diode and the second diode; a second pin of the connector is connected with a first end of the first switch; the first pin is communicated with the second pin;

a third pin of the connector is respectively connected with the first power-on port and a first positive power supply port of the battery management system; a fourth pin of the connector is connected with a fourth end of the second switch; the third pin is communicated with the fourth pin; the second end of the first switch is connected with the third end of the second switch;

a fifth pin of the connector is connected with the second power-on port; a sixth pin of the connector is respectively connected with the second end of the first switch and the third end of the second switch; wherein the fifth pin is communicated with the sixth pin;

the first electrifying port is respectively connected with the first positive power supply port and the third pin;

the first enabling port is connected with a first control port of the battery management system; the second enabling port is connected with a second control port of the battery management system; the battery management system is used for outputting a level signal for controlling the self-locking relay to be opened or closed to the self-locking relay.

With reference to the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, where the charging relay includes a third power-on port, a fourth power-on port, a third enable port, and a fourth enable port; the discharging relay comprises a fifth electrifying port, a sixth electrifying port, a fifth enabling port and a sixth enabling port;

the third electrifying port is respectively connected with the anode of the lithium battery pack and the anode of the first diode; the fourth current-carrying port is respectively connected with the fifth current-carrying port and the cathodes of the first diode and the second diode;

the third enabling port is connected with a third control port of the battery management system, and the fourth enabling port is connected with a fourth control port of the battery management system; the battery management system is used for outputting a level signal for controlling the charging relay to be opened or closed to the charging relay;

the fifth electrifying port is respectively connected with the fourth electrifying port and the cathodes of the first diode and the second diode; the sixth power-on port is respectively connected with the anode of the second diode and the charge-discharge anode port;

the fifth enabling port is connected with a fifth control port of the battery management system, and the sixth enabling port is connected with a sixth control port of the battery management system; the battery management system is used for outputting a level signal for controlling the opening or closing of the discharging relay to the discharging relay.

With reference to the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where the method further includes: the heating device comprises a heating film, a temperature sensing probe and a heating relay;

the charging and discharging anode port, the heating relay, the heating film and the charging and discharging cathode port are connected in series;

the heating relay and the heating film are connected with the charging relay, the discharging relay and the lithium battery pack in parallel; the heating relay and the heating film are connected in parallel with the first diode and the second diode; wherein the heating film is used for heating the lithium battery pack;

the battery management system is respectively connected with the temperature sensing probe and the heating relay; the temperature sensing probe is used for detecting the temperature of the lithium battery pack.

With reference to the fourth possible implementation manner of the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, wherein the heating relay includes a seventh power-on port, an eighth power-on port, a seventh enable port, and an eighth enable port;

the seventh electrifying port is connected with the heating film; the eighth electrifying port is respectively connected with the charge-discharge anode port, the anode of the second diode and the discharge relay;

the seventh enabling port is connected with a seventh control port of the battery management system, and the eighth enabling port is connected with an eighth control port of the battery management system; the battery management system is used for outputting a level signal for controlling the heating relay to be opened or closed to the heating relay.

With reference to the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, where the method further includes: a flow divider;

the shunt is connected between the lithium battery pack and the charge-discharge negative electrode port; the shunt is connected with the battery management system; the current divider is used for detecting the current value output by the lithium battery pack; and the battery management system is used for determining the residual electric quantity of the lithium battery pack according to the current value.

With reference to the first possible implementation manner of the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, where the battery management system further includes a display screen positive power supply port, a display screen negative power supply port, a first communication port, a second communication port, a third communication port, and a fourth communication port; the connector further includes: the display device comprises a first display screen anode power supply pin, a second display screen anode power supply pin, a first display screen cathode power supply pin, a second display screen cathode power supply pin, a first communication pin, a second communication pin, a third communication pin, a fourth communication pin, a fifth communication pin, a sixth communication pin, a seventh communication pin and an eighth communication pin; the first display screen positive power supply pin is communicated with the second display screen positive power supply pin; the first display screen cathode power supply pin is communicated with the second display screen cathode power supply pin; the first communication pin is communicated with the fifth communication pin; the second communication pin is communicated with the sixth communication pin; the third communication pin is communicated with the seventh communication pin; the fourth communication pin is communicated with the eighth communication pin;

the display screen positive power supply port is connected with the first display screen positive power supply pin, and the display screen negative power supply port is connected with the first display screen negative power supply pin; the second display screen positive power supply pin is connected with a second positive power supply port of the display screen, and the second display screen negative power supply pin is connected with a second negative power supply port of the display screen; the battery management system supplies power to the display screen through the connector;

the first communication port is connected with the first communication pin, and the second communication port is connected with the second communication pin; the fifth communication pin is connected with a fifth communication port of the display screen, and the sixth communication pin is connected with a sixth communication port of the display screen; the first communication port and the second communication port are used for sending information detected by the battery management system to the display screen;

the third communication port is connected with the third communication pin, and the fourth communication port is connected with the fourth communication pin; the seventh communication pin is connected with a seventh communication port of the charging equipment, and the eighth communication pin is connected with an eighth communication port of the charging equipment; the third communication port and the fourth communication port are used for outputting a level signal for controlling whether the charging equipment is charged or not to the charging equipment.

With reference to the first aspect, an embodiment of the present invention provides an eighth possible implementation manner of the first aspect, where the method further includes: a fuse;

the fuse is connected in series between the lithium battery pack and the charge-discharge negative electrode port; the fuse is used for fusing when the anode and the cathode of the lithium battery pack are in short circuit.

With reference to the first aspect, an embodiment of the present invention provides a ninth possible implementation manner of the first aspect, where the lithium battery pack includes a first lithium battery, a second lithium battery, a third lithium battery, and a fourth lithium battery; the first lithium battery, the second lithium battery, the third lithium battery and the fourth lithium battery are connected in series;

the output voltage values of the first lithium battery, the second lithium battery, the third lithium battery and the fourth lithium battery are all 3V; the output voltage value of the lithium battery pack is 12V;

the battery management system is respectively connected with the positive electrode and the negative electrode of the first lithium battery, the positive electrode and the negative electrode of the second lithium battery, the positive electrode and the negative electrode of the third lithium battery and the positive electrode and the negative electrode of the fourth lithium battery; the battery management system is used for detecting output voltage values of the first lithium battery, the second lithium battery, the third lithium battery and the fourth lithium battery.

According to the vehicle-mounted standby power supply system provided by the embodiment of the utility model, the charging relay, the discharging relay, the first diode and the second diode protection circuit are adopted, compared with the case that only one relay is adopted, when the battery is fully charged, the charging relay is disconnected, and if power needs to be supplied to electric equipment at the moment, the current provided by the lithium battery pack can directly supply power to the electric equipment through the first diode and the discharging relay, so that the problem that the electric equipment can be supplied with power only by manually restarting the whole vehicle standby power supply system is avoided. And because the one-way conductivity of first diode this moment, the direction circulation of electric current can only follow lithium cell group to consumer, and under the circumstances of charging relay disconnection, the electric current that charging equipment provided can not charge to lithium cell group through this first diode and charging relay, and then prevents that lithium cell group from overcharging. Further, under the less condition of the surplus electric quantity in the lithium cell group, the disconnection of discharge relay, charge relay is closed, the electric current that battery charging outfit provided passes through the second diode, charge relay charges lithium cell group, because the one-way electric conductivity of second diode this moment, the direction circulation that the electric current can only follow battery charging outfit to lithium cell group, under the condition of the disconnection of discharge relay, lithium cell group can not supply power to the consumer through discharge relay and second diode, and then prevent lithium cell group overdischarge. Through the vehicle-mounted standby power supply system provided by the application, the automatic switching of the charging and discharging states of the lithium battery pack in the charging and discharging states can be realized.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram illustrating an on-vehicle standby power supply system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a latching relay and connector provided by an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a charging relay and a discharging relay provided in an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a second vehicle-mounted standby power supply system provided by the embodiment of the utility model;

FIG. 5 is a schematic diagram of a flow diverter provided by an embodiment of the present invention;

FIG. 6 is a schematic diagram of a connector provided by an embodiment of the present invention;

fig. 7 shows a schematic structural diagram of a lithium battery pack provided by an embodiment of the utility model.

Reference numerals: charging and discharging the anode port 1; a discharge relay 2; a charging relay 3; a lithium battery pack 4; a charge and discharge negative electrode port 5; a battery management system 6; an antenna 7; a latching relay 8; a first switch 9; a second switch 10; a first diode 11; a second diode 12; a charging device 13; the electric equipment 14; a connector 15; heating the film 16; a temperature-sensitive probe 17; a heating relay 18; a flow divider 19; a display screen 20; a fifth power port 201; a sixth power-on port 202; a fifth enable port 203; a sixth enable port 204; a third energizing port 301; a fourth electrical port 302; a third enable port 303; a fourth enable port 304; a first lithium battery 401; a second lithium battery 402; a third lithium battery 403; a fourth lithium battery 404; a first positive power supply port 601; a first negative power supply port 602; a first control port 603; a second control port 604; a third control port 605; a fourth control port 606; a fifth control port 607; a sixth control port 608; a shunt positive port 609; a shunt negative port 610; a display screen positive power supply port 611; a display screen cathode power supply port 612; a first communication port 613; a second communication port 614; a third communication port 615; a fourth communication port 616; a seventh control port 617; an eighth control port 618; a first power-on port 801; a second power-on port 802; a first enable port 803; a second enable port 804; a first pin 1501; a second pin 1502; a third pin 1503; a fourth pin 1504; a fifth pin 1505; a sixth pin 1506; a first display screen positive power supply pin 1507; a second display screen positive supply pin 1508; a first display screen cathode power supply pin 1509; a second display screen negative supply pin 1510; a first communication pin 1511; a second communication pin 1512; a third communication pin 1513; a fourth communication pin 1514; a fifth communication pin 1515; a sixth communication pin 1516; a seventh communication pin 1517; an eighth communication pin 1518; a seventh power-on port 1801; an eighth power-on port 1802; a seventh enable port 1803; an eighth enable port 1804; a first detection port 1901; a second detection port 1902; a first transfer port 1903; a second transmission port 1904; a second positive power supply port 2001; a second negative supply port 2002; a fifth communication port 2003; a sixth communication port 2004; a seventh communication port 2005; an eighth communication port 2006.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

At present, most lithium batteries used in automobiles adopt a protection plate form, and because the MOS tube on the protection plate is easy to generate heat and cause explosion when passing large current, the current passed by the protection plate is generally low (generally maintained at 150A), and the actual current using requirement (300A) of the vehicle cannot be met. In addition, a relay is generally used in a power supply system in an automobile at present, when a lithium battery is fully charged, the relay is disconnected, and at the moment, if the lithium battery is required to discharge, namely, power is supplied to electric equipment, the standby power supply system of the whole automobile needs to be manually restarted.

The problem that the lithium battery pack in the standby power supply system in the prior art is fully charged, when the relay is disconnected, the standby power supply system of the whole vehicle needs to be manually restarted to supply power to the electric equipment is solved, and the problem that the circulating current is small when a protection board is adopted is solved. Based on this, this application embodiment provides a vehicle-mounted reserve power supply system to avoid when the battery is full of electricity, when the relay disconnection, need the artifical problem that restarts the reserve power supply system of full car could just carry out the power supply to consumer, and improve the size of the electric current when lithium cell group charges and discharges. The following is described by way of example.

For the convenience of understanding the present embodiment, a detailed description will be given first of all to a vehicle-mounted backup power supply system disclosed in the embodiments of the present application. Fig. 1 shows a schematic structural diagram of an on-vehicle backup power supply system provided in an embodiment of the present application, the on-vehicle backup power supply system is used for supplying power to a vehicle when a generator of the vehicle stops supplying power or when the generator cannot meet a power demand of the vehicle, and as shown in fig. 1, the on-vehicle backup power supply system includes: the charging and discharging system comprises a charging and discharging positive electrode port 1, a discharging relay 2, a charging relay 3, a lithium battery pack 4, a charging and discharging negative electrode port 5, a battery management system 6, an antenna 7, a self-locking relay 8, a first switch 9, a second switch 10, a first diode 11 and a second diode 12; wherein, the cathode of the first diode 11 is connected with the cathode of the second diode 12;

the charging and discharging positive electrode port 1 is electrically connected with a positive electrode port of the charging equipment 13 and a positive electrode port of the electric equipment 14; the charging and discharging negative electrode port 5 is electrically connected with a negative electrode port of the charging equipment 13 and a negative electrode port of the electric equipment 14;

the charging and discharging positive electrode port 1, the discharging relay 2, the charging relay 3, the lithium battery pack 4 and the charging and discharging negative electrode port 5 are connected in series to form a closed loop;

an anode of a first diode 11 is connected between the lithium battery pack 4 and the charging relay 3, cathodes of the first diode 11 and a second diode 12 are connected between the charging relay 3 and the discharging relay 2, and an anode of the second diode 12 is connected between the discharging relay 2 and the charging and discharging anode port 1;

the lithium battery pack 4, the first diode 11, the first switch 9, the second switch 10 and the battery management system 6 are connected in series to form a closed loop; wherein, the first switch 9 is connected with the cathodes of the first diode 11 and the second diode 12;

the lithium battery pack 4, the first diode 11, the first switch 9, the self-locking relay 8 and the battery management system 6 are connected in series to form a closed loop;

the battery management system 6 is respectively connected with the lithium battery pack 4, the charge and discharge negative electrode port 5, the antenna 7, the self-locking relay 8, the charge relay 3 and the discharge relay 2; the first negative power supply port 602 of the battery management system 6 is connected with the charge/discharge negative port 5; the antenna 7 is used for sending information detected by the battery management system 6 to the cloud platform.

In the embodiment of the application, the start of the on-board standby power supply system is controlled by the first switch 9 and the second switch 10, for example, when the first switch 9 and the second switch 10 are closed, the current provided by the lithium battery pack 4 is input into the battery management system 6 through the first diode 11, the first switch 9 and the second switch 10, the battery management system 6 is used for controlling the latching relay 8 to be closed, the second switch 10 is opened, and the on-board standby power supply system is started.

In the embodiment of the present application, when the lithium battery pack 4 discharges, that is, when the electrical equipment 14 in the vehicle is powered, the battery management system 6 is configured to control the discharging relay 2 to be closed, and at this time, the lithium battery pack 4, the first diode 11, the discharging relay 2, the charging and discharging positive electrode port 1, the electrical equipment 14, and the charging and discharging negative electrode port 5 form a closed loop, so that the lithium battery pack 4 powers the electrical equipment 14.

When the lithium battery pack 4 needs to be charged, the battery management system 6 is used for controlling the discharging relay 2 to be disconnected and the charging relay 3 to be closed, and at the moment, a closed loop is formed by the lithium battery pack 4, the charging relay 3, the second diode 12, the charging and discharging anode port 1, the charging equipment 13 and the charging and discharging cathode port 5, so that the charging equipment 13 charges the lithium battery pack 4.

In the embodiment of the application, the charging relay 3 is used for disconnecting the circuit to protect the lithium battery pack 4 when the lithium battery pack 4 is fully charged, and the discharging relay 2 is used for disconnecting the circuit to protect the lithium battery pack 4 when the lithium battery pack 4 is discharged. The first diode 11 is used for under the circumstances that charging relay 3 breaks off (namely lithium cell group 4 is full of electricity), if when having the consumer 14 power consumption, can make lithium cell group 4 normally for the consumer 14 power supply, avoid the outage condition to take place. The second diode 12 is used for under the condition that the discharge relay 2 is disconnected (the lithium battery pack 4 is emptied of electric quantity), if there is the charging equipment 13 to charge for the lithium battery pack 4, the lithium battery pack 4 can normally receive the charging current provided by the charging equipment 13 through the second diode 12, and the condition that charging cannot be performed is avoided. The lithium battery pack 4 serves as a core component of the vehicle-mounted standby power supply system and is used for storing electric energy and supplying power to the electric equipment 14. The battery management system 6 is connected to the lithium battery pack 4 and is configured to detect an output voltage value of the lithium battery pack 4. The battery management system 6 is a BMS management system, and the electric devices 14 include all the electric devices 14 on the vehicle, and include at least one.

In a possible embodiment, the on-board backup power supply system further comprises: a connector 15;

a connector 15 is connected between the first switch 9 and the cathodes of the first diode 11 and the second diode 12; a connector 15 is connected between the second switch 10 and the battery management system 6; a connector 15 is connected between the first switch 9 and the second switch 10 and the latching relay 8.

In a possible implementation manner, fig. 2 shows a structural schematic diagram of the latching relay and the connector provided in the embodiment of the present application, as shown in fig. 2, the latching relay 8 includes a first power-on port 801, a second power-on port 802, a first enable port 803, and a second enable port 804, and a first pin 1501 of the connector 15 is connected to cathodes of the first diode 11 and the second diode 12; the second pin 1502 of the connector 15 is connected to a first terminal of the first switch 9; the first pin 1501 is communicated with the second pin 1502;

the third pin 1503 of the connector 15 is connected to the first energization port 801 and the first positive power supply port 601 of the battery management system 6, respectively; the fourth pin 1504 of the connector 15 is connected to the fourth terminal of the second switch 10; the third pin 1503 is communicated with the fourth pin 1504; the second end of the first switch 9 is connected with the third end of the second switch 10;

the fifth pin 1505 of the connector 15 is connected to the second power port 802; a sixth pin 1506 of the connector 15 is respectively connected to the second terminal of the first switch 9 and the third terminal of the second switch 10; wherein the fifth pin 1505 is in communication with the sixth pin 1506;

the first energization port 801 is connected with the first positive power supply port 601 and the third pin 1503 respectively;

the first enabling port 803 is connected with a first control port 603 of the battery management system 6; the second enabling port 804 is connected with the second control port 604 of the battery management system 6; the battery management system 6 is used for outputting a level signal for controlling the opening or closing of the latching relay 8 to the latching relay 8.

In the embodiment of the application, the self-locking relay 8 is used for automatically disconnecting when the electric quantity of the lithium battery pack 4 is discharged or is low, so that the vehicle-mounted standby power supply system stops working, and the lithium battery pack 4 is prevented from being over-discharged.

In a possible implementation manner, fig. 3 illustrates a structural schematic diagram of a charging relay and a discharging relay provided in an embodiment of the present application, and as shown in fig. 3, the charging relay 3 includes a third power-on port 301, a fourth power-on port 302, a third enable port 303, and a fourth enable port 304; the discharge relay 2 includes a fifth energization port 201, a sixth energization port 202, a fifth enable port 203, and a sixth enable port 204;

the third power-on port 301 is respectively connected with the anode of the lithium battery pack 4 and the anode of the first diode 11; the fourth energization port 302 is connected to the fifth energization port 201 and the cathodes of the first diode 11 and the second diode 12, respectively;

the third enabling port 303 is connected with a third control port 605 of the battery management system 6, and the fourth enabling port 304 is connected with a fourth control port 606 of the battery management system 6; the battery management system 6 is used for outputting a level signal for controlling the charging relay 3 to be opened or closed to the charging relay 3;

the fifth energization port 201 is connected to the fourth energization port 302 and the cathodes of the first diode 11 and the second diode 12, respectively; the sixth electrifying port 202 is respectively connected with the anode of the second diode 12 and the charge-discharge anode port 1;

the fifth enabling port 203 is connected with a fifth control port 607 of the battery management system 6, and the sixth enabling port 204 is connected with a sixth control port 608 of the battery management system 6; the battery management system 6 is configured to output a level signal for controlling the opening or closing of the discharge relay 2 to the discharge relay 2.

In a possible implementation, fig. 4 shows a schematic structural diagram of a second vehicle-mounted standby power supply system provided in the embodiment of the present application, which further includes a heating film 16, a temperature-sensing probe 17, and a heating relay 18; as shown in fig. 4, the heating relay 18 and the heating film 16 are connected in parallel with the charging relay 3, the discharging relay 2, and the lithium battery pack 4; the heating relay 18 and the heating film 16 are connected in parallel with the first diode 11 and the second diode 12; wherein the heating film 16 is used for heating the lithium battery pack 4;

the battery management system 6 is respectively connected with the temperature sensing probe 17 and the heating relay 18; the temperature-sensitive probe 17 is used for detecting the temperature of the lithium battery pack 4.

In the embodiment of the present application, when the heating relay 18 is used for heating the lithium battery pack 4, the heating relay 18 is closed, so that the lithium battery pack 4 is heated by the heating film 16, and the heating relay 18 is opened when the heating is completed, so that the heating is completed.

In one possible embodiment, as shown in fig. 4, the heating relay 18 includes a seventh power-on port 1801, an eighth power-on port 1802, a seventh enable port 1803, and an eighth enable port 1804;

the seventh energization port 1801 is connected to the heating film 16; the eighth electrifying port 1802 is connected with the charge-discharge anode port 1, the anode of the second diode 12 and the discharge relay 2 respectively;

the seventh enable port 1803 is connected to the seventh control port 617 of the battery management system 6, and the eighth enable port 1804 is connected to the eighth control port 618 of the battery management system 6; the battery management system 6 is configured to output a level signal to the heating relay 18, which controls the heating relay 18 to open or close.

In a possible implementation manner, fig. 5 shows a schematic structural diagram of the current divider provided in the embodiment of the present application, and the on-board standby power supply system further includes a current divider 19, as shown in fig. 5, the current divider 19 is connected between the lithium battery pack 4 and the charge and discharge negative electrode port 5; the shunt 19 is connected with the battery management system 6; the current divider 19 is used for detecting the current value output by the lithium battery pack 4; the battery management system 6 is used for determining the residual capacity of the lithium battery pack 4 according to the current value.

Specifically, the shunt 19 is used to detect the current value output by the lithium battery pack 4, so that the battery management system 6 is used to calculate the remaining capacity of the lithium battery pack 4 according to the current value detected by the shunt 19. As shown in fig. 5, the shunt 19 includes a first detection port 1901, a second detection port 1902, a first transmission port 1903, and a second transmission port 1904, the first detection port 1901 is connected to the negative electrode of the lithium battery pack 4, the second detection port 1902 is connected to the charge/discharge negative electrode port 5, the first transmission port 1903 is connected to the shunt positive electrode port 609 of the battery management system 6, and the second transmission port 1904 is connected to the shunt negative electrode port 610 of the battery management system 6.

In the embodiment of the present application, when the battery management system 6 calculates the remaining capacity of the lithium battery pack 4, the capacity value may be transmitted to the cloud platform through the antenna 7, and the circuit may be transmitted to the display screen 20 through the connector 15.

In a possible implementation manner, fig. 6 shows a schematic structural diagram of the connector provided in the embodiment of the present application, and as shown in fig. 6, the battery management system 6 further includes a display positive power supply port 611, a display negative power supply port 612, a first communication port 613, a second communication port 614, a third communication port 615, and a fourth communication port 616; the connector 15 further includes: a first display screen positive power supply pin 1507, a second display screen positive power supply pin 1508, a first display screen negative power supply pin 1509, a second display screen negative power supply pin 1510, a first communication pin 1511, a second communication pin 1512, a third communication pin 1513, a fourth communication pin 1514, a fifth communication pin 1515, a sixth communication pin 1516, a seventh communication pin 1517 and an eighth communication pin 1518; the first display screen positive power supply pin 1507 is communicated with the second display screen positive power supply pin 1508; the first display screen negative power supply pin 1509 is communicated with the second display screen negative power supply pin 1510; the first communication pin 1511 is in communication with the fifth communication pin 1515; the second communication pin 1512 is in communication with the sixth communication pin 1516; the third communication pin 1513 is in communication with the seventh communication pin 1517; the fourth communication pin 1514 is in communication with an eighth communication pin 1518;

the display screen positive power supply port 611 is connected with a first display screen positive power supply pin 1507, and the display screen negative power supply port 612 is connected with a first display screen negative power supply pin 1509; the second positive power supply pin 1508 of the display screen is connected with the second positive power supply port 2001 of the display screen, and the second negative power supply pin 1510 of the display screen is connected with the second negative power supply port 2002 of the display screen; the battery management system 6 supplies power to the display screen 20 through the connector 15;

the first communication port 613 is connected with the first communication pin 1511, and the second communication port 614 is connected with the second communication pin 1512; the fifth communication pin 1515 is connected with the fifth communication port 2003 of the display screen 20, and the sixth communication pin 1516 is connected with the sixth communication port 2004 of the display screen 20; the first communication port 613 and the second communication port 614 are used for sending information detected by the battery management system 6 to the display screen 20;

the third communication port 615 is connected to a third communication pin 1513, and the fourth communication port 616 is connected to a fourth communication pin 1514; the seventh communication pin 1517 is connected to the seventh communication port 2005 of the charging device 13, and the eighth communication pin 1518 is connected to the eighth communication port 2006 of the charging device 13; the third communication port 615 and the fourth communication port 616 are used to output a level signal for controlling whether the charging device 13 performs charging to the charging device 13.

In a possible embodiment, the onboard backup power supply system further comprises a fuse;

a fuse is connected in series between the lithium battery pack 4 and the charge-discharge negative electrode port 5; the fuse is used for fusing when the positive negative pole of lithium cell group 4 short circuit to protection lithium cell group 4 does not receive the damage.

In a possible implementation manner, fig. 7 shows a schematic structural diagram of a lithium battery pack provided in an example of the present application, and as shown in fig. 7, the lithium battery pack 4 includes a first lithium battery 401, a second lithium battery 402, a third lithium battery 403, and a fourth lithium battery 404; a first lithium battery 401, a second lithium battery 402, a third lithium battery 403 and a fourth lithium battery 404 are connected in series;

the output voltage values of the first lithium battery 401, the second lithium battery 402, the third lithium battery 403 and the fourth lithium battery 404 are all 3V; the output voltage value of the lithium battery pack 4 is 12V;

the battery management system 6 is respectively connected with the positive and negative electrodes of the first lithium battery 401, the positive and negative electrodes of the second lithium battery 402, the positive and negative electrodes of the third lithium battery 403 and the positive and negative electrodes of the fourth lithium battery 404; the battery management system 6 is configured to detect output voltage values of the first lithium battery 401, the second lithium battery 402, the third lithium battery 403, and the fourth lithium battery 404.

In the embodiment of the present application, the negative electrode of the first lithium battery 401 is connected to the charging/discharging negative electrode port 5, the positive electrode of the first lithium battery 401 is connected to the negative electrode of the second lithium battery 402, the positive electrode of the second lithium battery 402 is connected to the negative electrode of the third lithium battery 403, the positive electrode of the third lithium battery 403 is connected to the negative electrode of the fourth lithium battery 404, and the positive electrode of the fourth lithium battery 404 is connected to the charging relay 3 and the first diode 11.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the description refers must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the present invention in its spirit and scope. Are intended to be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. An on-board backup power supply system, the system comprising: the system comprises a charge-discharge positive electrode port, a discharge relay, a charge relay, a lithium battery pack, a charge-discharge negative electrode port, a battery management system, an antenna, a self-locking relay, a first switch, a second switch, a first diode and a second diode; wherein the cathode of the first diode is connected with the cathode of the second diode;

2. The system of claim 1, further comprising: a connector;

3. The system of claim 2, wherein the latching relay comprises a first power-on port, a second power-on port, a first enable port, and a second enable port;

4. The system of claim 1, wherein the charging relay comprises a third power-on port, a fourth power-on port, a third enable port, and a fourth enable port; the discharging relay comprises a fifth electrifying port, a sixth electrifying port, a fifth enabling port and a sixth enabling port;

5. The system of claim 1, further comprising: the heating device comprises a heating film, a temperature sensing probe and a heating relay;

6. The system of claim 5, wherein the heating relay comprises a seventh energizing port, an eighth energizing port, a seventh enable port, and an eighth enable port;

7. The system of claim 1, further comprising: a flow divider;

8. The system of claim 2, wherein the battery management system further comprises a display screen positive power port, a display screen negative power port, a first communication port, a second communication port, a third communication port, and a fourth communication port; the connector further includes: the display device comprises a first display screen anode power supply pin, a second display screen anode power supply pin, a first display screen cathode power supply pin, a second display screen cathode power supply pin, a first communication pin, a second communication pin, a third communication pin, a fourth communication pin, a fifth communication pin, a sixth communication pin, a seventh communication pin and an eighth communication pin; the first display screen positive power supply pin is communicated with the second display screen positive power supply pin; the first display screen cathode power supply pin is communicated with the second display screen cathode power supply pin; the first communication pin is communicated with the fifth communication pin; the second communication pin is communicated with the sixth communication pin; the third communication pin is communicated with the seventh communication pin; the fourth communication pin is communicated with the eighth communication pin;

9. The system of claim 1, further comprising: a fuse;

10. The system of claim 1, wherein the lithium battery pack comprises a first lithium battery, a second lithium battery, a third lithium battery, and a fourth lithium battery; the first lithium battery, the second lithium battery, the third lithium battery and the fourth lithium battery are connected in series;