CN213027471U

CN213027471U - Battery management system of photovoltaic energy storage standby power supply of mobile base station

Info

Publication number: CN213027471U
Application number: CN202021276307.1U
Authority: CN
Inventors: 张晔; 张世桐; 咸立坤; 兰维机
Original assignee: Huizhou Sanhua Industrial Co ltd
Current assignee: Huizhou Sanhua Industrial Co ltd
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2021-04-20
Anticipated expiration: 2030-07-03

Abstract

The utility model discloses a battery management system of photovoltaic energy storage standby power supply of mobile base station, including group battery, BEMS host computer, load and charging device, the BEMS host computer with the total positive terminal of group battery and total negative terminal electricity are connected, and the BEMS host computer respectively with the load with charging device electricity is connected; the battery pack comprises a plurality of battery units which are sequentially connected in series, wherein in one of the battery units, each battery unit comprises a sampling plate and two single batteries which are connected in series, the sampling plate is in communication connection with the BEMS host, the sampling plate comprises an equalizing circuit and a switch circuit, the equalizing circuit is respectively electrically connected with the two single batteries, and the switch circuit is respectively electrically connected with the BEMS host and the battery units. The utility model relates to a mobile base station photovoltaic energy storage stand-by power supply's battery management system through setting up group battery and BEMS host computer, can constitute new stand-by power supply system with the old battery that eliminates, realizes cyclic utilization.

Description

Battery management system of photovoltaic energy storage standby power supply of mobile base station

Technical Field

The utility model relates to a battery management system field especially relates to a mobile base station photovoltaic energy storage stand-by power supply's battery management system.

Background

At present, a mobile base station and an energy storage type solar power supply both use new batteries, particularly lead-acid batteries, and a plurality of single batteries are connected in series to form a battery pack, and then the battery pack is directly connected to equipment to serve as a standby power supply for uninterrupted power supply of the equipment. The new battery is too expensive to use, and the existing BMS power supply needs to be used for management, so that the maintenance cost and the use cost are higher, and therefore, how to use the obsolete battery on the electric vehicle as the standby power supply is a problem to be considered by those skilled in the art.

However, if the used battery is used in the mobile base station, the consistency is poor due to the obsolete used battery, and the internal parameters of the battery are inconsistent, and if one of the batteries is abnormal, the device may not achieve the purpose of uninterrupted power supply. Moreover, most of the existing BMSs only manage the whole battery pack, only collect single batteries and do not control the single batteries, so that the requirement on the consistency of the batteries is very high, and the consistency difference of the eliminated old batteries cannot meet the requirement of a communication base station or photovoltaic energy storage.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the weak point among the prior art, provide a mobile base station photovoltaic energy storage stand-by power supply's battery management system that the uniformity is good, can realize the control to single battery.

The purpose of the utility model is realized through the following technical scheme:

a battery management system of a photovoltaic energy storage standby power supply of a mobile base station comprises:

the system comprises a battery pack, a BEMS main machine, a load and a charging device, wherein the BEMS main machine is electrically connected with a total positive end and a total negative end of the battery pack, and the BEMS main machine is respectively electrically connected with the load and the charging device;

the battery pack comprises a plurality of battery units which are sequentially connected in series, wherein in one of the battery units, each battery unit comprises a sampling plate and two single batteries which are connected in series, the sampling plate is in communication connection with the BEMS host, the sampling plate comprises an equalizing circuit and a switch circuit, the equalizing circuit is respectively electrically connected with the two single batteries, and the switch circuit is respectively electrically connected with the BEMS host and the battery units.

In one embodiment, the charging device comprises a new energy charger and a base station charger, and the new energy charger and the base station charger are electrically connected with the BEMS host and the load respectively.

In one embodiment, the switch circuit includes a first switch and a second switch, one end of the first switch is electrically connected to the overall positive terminal of the battery unit, the other end of the first switch is electrically connected to one end of the second switch, the other end of the second switch is electrically connected to the overall negative terminal of the battery unit, and the other end of the second switch is further used for electrically connecting the second switch of another battery unit.

In one embodiment, the first switch comprises a resistor R101, a resistor R102 and a MOS transistor Q101, the D pole of the MOS transistor Q101 is connected to the overall positive terminal of the battery unit, the S pole of the MOS transistor Q101 is electrically connected to the second switch, and the G pole of the MOS transistor Q101 is used for electrically connecting to the sampling plate.

In one embodiment, the second switch comprises a resistor R104, a resistor R103 and a MOS transistor Q102, the D pole of the MOS transistor Q102 is electrically connected to the first switch, the S pole of the MOS transistor Q102 is connected to the overall negative terminal of the battery unit, and the G pole of the MOS transistor Q102 is used for electrically connecting to the sampling plate.

In one embodiment, the equalization circuit includes an inductor L101, a MOS transistor Q103, and a MOS transistor Q104, a D pole of the MOS transistor Q103 is connected to the overall positive terminal of the battery unit, S poles of the MOS transistor Q103 are respectively connected to one end of the inductor L101 and the D pole of the MOS transistor Q104, the other end of the inductor L101 is electrically connected to a connection node of two series-connected single batteries, S pole of the MOS transistor Q104 is connected to the overall negative terminal of the battery unit, and G poles of the MOS transistor Q103 and the MOS transistor Q104 are respectively electrically connected to the sampling plate.

In one embodiment, the battery pack is provided in plurality, the BEMS host is provided in plurality, and each BEMS host is electrically connected with one battery pack in a one-to-one correspondence manner.

In one embodiment, the battery management system further includes a balancing controller, the balancing controller is electrically connected to each battery pack and the BEMS host, and the balancing controller is further in communication connection with the BEMS host.

In one embodiment, two adjacent sampling plates are in communication connection with each other.

In one embodiment, the battery management system further comprises a wireless communication module electrically connected to the BEMS host.

The utility model discloses compare in prior art's advantage and beneficial effect as follows:

the utility model relates to a mobile base station photovoltaic energy storage stand-by power supply's battery management system through setting up group battery and BEMS host computer, can constitute new stand-by power supply system with the old battery that eliminates, realizes cyclic utilization. And through setting up equalizer circuit and switch circuit, can carry out the equilibrium to the battery for battery internal parameter uniformity is high, thereby can realize more efficient power supply. In addition, the battery management system is additionally provided with a new energy power supply mode for management, and power supply is not performed by singly relying on commercial power any more, so that new clean energy is used for supplying power, the utilization rate of the battery is improved, the use number of the battery is reduced, and the purposes of energy conservation and environmental protection are achieved. In addition, the battery management system is more beneficial to the maintenance of the battery, and is more beneficial to the upgrading and reconstruction of the existing standby power supply system, so that the purpose of reducing the cost is achieved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required 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 diagram of a photovoltaic energy storage standby power supply of a mobile base station according to an embodiment of the present invention;

FIG. 2 is a functional block diagram of a switching circuit of the battery management system shown in FIG. 1;

FIG. 3 is a circuit diagram of the switching circuit shown in FIG. 2;

FIG. 4 is a circuit diagram of the equalization circuit shown in FIG. 1;

FIG. 5 is a functional block diagram of another embodiment of the battery management system shown in FIG. 1;

fig. 6 is a circuit diagram of the BEMS host of the battery management system shown in fig. 1.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It can be understood that the current mobile base station and the energy storage type solar power supply use new batteries, particularly lead-acid batteries, and a plurality of single batteries are connected in series to form a battery pack, and then the battery pack is directly connected to equipment to serve as a standby power supply for uninterrupted power supply of the equipment, and the problems of high management and maintenance cost, short service life, environmental pollution and the like of the current BMS power supply are solved.

Referring to fig. 1, a battery management system of a photovoltaic energy storage backup power source of a mobile base station includes: the battery pack 100, the BEMS main unit 200, the load 300, and the charging device 400, the BEMS main unit being electrically connected to a total positive terminal and a total negative terminal of the battery pack, and the BEMS main unit being electrically connected to the load and the charging device, respectively. It should be noted that the battery pack 100 is an old battery, and is used for supplying power to the outside; the BEMS host 200 is configured to implement balance control on the battery pack, so that consistency of each battery unit in the battery pack is high, and the BEMS host is not only configured to implement the balance control function on the battery pack, but also has a voltage boosting and reducing function, that is, voltage reduction is performed when the battery pack is charged, and voltage boosting is performed when a base station load is discharged (the voltage boosting reaches a voltage required by the base station); the load 300 is used for connecting with a BEMS host; the charging device 400 is used for charging the battery pack after voltage conversion is performed through the BEMS host.

Referring to fig. 1 and 2, the battery pack includes a plurality of battery units sequentially connected in series, in one of the battery units, the battery unit includes a sampling board 110 and two single batteries 120 connected in series, the sampling board is in communication connection with the BEMS host, the sampling board includes an equalizing circuit and a switching circuit, the equalizing circuit is electrically connected to the two single batteries, and the switching circuit is electrically connected to the BEMS host and the battery unit. It should be noted that the sampling board 110 mainly samples the voltages of the two batteries corresponding to the sampling board, calculates the electric quantity, performs the input and cut-off processing on the batteries, and sends the sampling information to the BEMS host for processing. Further, two adjacent sampling plates are in communication connection with each other.

Therefore, by arranging the battery pack and the BEMS host, the eliminated old batteries can form a new standby power supply system, and cyclic utilization is realized. And through setting up equalizer circuit and switch circuit, can carry out the equilibrium to the battery for battery internal parameter uniformity is high, thereby can realize more efficient power supply. In addition, the battery management system is additionally provided with a new energy power supply mode for management, and power supply is not performed by singly relying on commercial power any more, so that new clean energy is used for supplying power, the utilization rate of the battery is improved, the use number of the battery is reduced, and the purposes of energy conservation and environmental protection are achieved. In addition, the battery management system is more beneficial to the maintenance of the battery, and is more beneficial to the upgrading and reconstruction of the existing standby power supply system, so that the purpose of reducing the cost is achieved.

It should be noted that the charging device 400 includes a new energy charger 410 and a base station charger 420, and the new energy charger and the base station charger are electrically connected to the BEMS host and the load, respectively. The new energy charger 410 and the base station charger 420 are charged for the battery pack after voltage conversion by the BEMS host.

Referring to fig. 2, the switch circuit includes a first switch and a second switch, one end of the first switch is electrically connected to the overall positive terminal of the battery unit, the other end of the first switch is electrically connected to one end of the second switch, the other end of the second switch is electrically connected to the overall negative terminal of the battery unit, and the other end of the second switch is further used for electrically connecting to the second switch of another battery unit. The first switch is used for controlling the connection or disconnection of a single battery unit, the second switch is used for realizing the electric connection between the battery unit where the switch is located and another battery unit, and namely the first switch and the second switch are used for controlling the input and the cut-off of the battery units.

Referring to fig. 3, the first switch includes a resistor R101, a resistor R102, and a MOS transistor Q101, a D pole of the MOS transistor Q101 is connected to the total positive terminal of the battery unit, an S pole of the MOS transistor Q101 is electrically connected to the second switch, and a G pole of the MOS transistor Q101 is used for electrically connecting to the sampling plate.

Referring to fig. 3, the second switch includes a resistor R104, a resistor R103, and a MOS transistor Q102, a D pole of the MOS transistor Q102 is electrically connected to the first switch, an S pole of the MOS transistor Q102 is connected to the total negative terminal of the battery unit, and a G pole of the MOS transistor Q102 is electrically connected to the sampling plate.

It should be noted that the MOS transistors Q101 and Q102 mainly control the input and the removal of the battery. The MOS tube Q101 and the MOS tube Q102 are driving complementary switches, and when the MOS tube Q101 is in a conducting state and the MOS tube Q102 is in a disconnecting state, the two batteries corresponding to the sampling plate are connected into the system; when the MOS tube Q101 is switched off and the MOS tube Q102 is switched on, the two batteries corresponding to the sampling plate are disconnected and are not connected into the system.

Referring to fig. 4, the equalizing circuit includes an inductor L101, an MOS transistor Q103, and an MOS transistor Q104, a D pole of the MOS transistor Q103 is connected to the total positive terminal of the battery unit, an S pole of the MOS transistor Q103 is respectively connected to one end of the inductor L101 and the D pole of the MOS transistor Q104, the other end of the inductor L101 is electrically connected to a connection node of two serially connected single batteries, the S pole of the MOS transistor Q104 is connected to the total negative terminal of the battery unit, and G poles of the MOS transistor Q103 and the MOS transistor Q104 are respectively electrically connected to the sampling plate.

In the sampling plate, the MOS transistor Q103 and the MOS transistor Q104 are complementary switches for driving, and the MOS transistor Q103 and the MOS transistor Q104 are mainly used for current balancing between two batteries corresponding to the sampling plate. When the voltages of the batteries are inconsistent, the circuit can balance the two batteries, the balancing circuit is controlled by the IC, the current flows from the battery with high voltage to the battery with low voltage, and the current is controllable.

In this embodiment, the battery management system further includes a wireless communication module, and the wireless communication module is electrically connected to the BEMS host. The wireless communication module is used for realizing wireless communication with the outside.

Referring to fig. 5, a plurality of battery packs are provided, a plurality of BEMS hosts are provided, and each BEMS host is electrically connected to one battery pack in a one-to-one correspondence manner. In this embodiment, there are two battery packs, and a parallel operation system can be implemented when there is a battery system composed of two battery packs, and the operating power of the parallel operation system is twice as high as that of a single-machine system. It should be noted that, when a plurality of BEMS masters are provided, one of the BEMS masters is set according to actual requirements, and the other BEMS slaves are set as BEMS slaves, and each BEMS slave is in communication connection with the BEMS master. When the BEMS parallel system works, one BEMS host is set to be in a host mode, the other BEMS hosts are set to be in a slave mode, the BEMS hosts are in communication connection with each other, and the BEMS host controls the operation of the BEMS slave.

Referring to fig. 5, in this embodiment, the battery management system further includes a balancing controller 500, the balancing controller is electrically connected to each battery pack and the BEMS host, and the balancing controller is further in communication connection with the BEMS host. The equalization controller 500 is used to equalize the voltage and the total charge between the two battery packs. When BEMS parallel operation is in operation, a balance controller circuit is added at the front end of the battery pack, and the battery pack is subjected to current balance through the balance controller circuit, so that the voltage and the total electric quantity of the battery pack between the two battery packs are more consistent, the efficiency is higher when the two host machines are parallel operation, the maximum output power can be reached, the electric quantities of the two battery packs are close to be used up simultaneously, and the service efficiency of the two battery packs is higher.

When the system works, the charging process is as follows: when the battery pack is charged, each battery sampling board acquires information such as voltage, current, temperature and the like of the battery, sends data to the BEMS host for periodic comparison, disconnects the first few batteries with more electric quantity of the battery, preferentially charges the batteries with less electric quantity in the rest access systems, compares the electric quantity of all the batteries when the next comparison period is reached, disconnects the first few batteries with more electric quantity, and charges the batteries with less electric quantity in the rest access systems in cycles. When the charging is nearly full, the fully charged batteries are cut off and are not switched on again until all the batteries are fully charged.

And (3) discharging: when the batteries are discharged, each battery sampling board collects information such as voltage, current and temperature of the batteries, sends data to the BEMS host for periodic comparison, disconnects the first few batteries with low battery power, preferentially discharges the batteries with high battery power in the rest access systems, compares all the battery power in the next comparison period, disconnects the first few batteries with low power, preferentially discharges the batteries with high battery power in the rest access systems, and repeats the process. When the battery is discharged to the capacity of the battery, the battery discharge is stopped, and the battery is not connected into the system again until all the battery capacity is discharged.

In the parallel machine discharging process, when the voltages of two battery packs are not consistent, namely one battery pack has strong discharging capability and the other battery pack has weak discharging capability, the battery pack with strong discharging capability is subjected to supplementary discharging through a battery pack balancing controller circuit, so that two groups of batteries reach the same voltage and have the same discharging capability, the voltage fluctuation of the front end of the BEMS host is smaller and relatively stable, the two BEMS host can reach the maximum power when outputting, and the whole BEMS system can also reach the maximum power output when working.

Each sampling plate controls two groups of batteries, and when the voltages of the two batteries are inconsistent, the equalizing circuit of the sampling plate is started, so that the electric quantity of the two batteries is consistent, the performances are consistent, and the batteries can be better discharged.

If in the charging and discharging process, the sampling plate MCU detects and judges that one battery is damaged, the battery is cut off, meanwhile, the battery is reversely repaired, and after multiple times of repair, the battery is judged to be damaged, and then information is sent to inform maintenance personnel to replace the battery.

The BEMS host is mainly responsible for charging and discharging the battery pack, protecting and controlling the battery pack, controlling external communication, and controlling switching between new energy power supply and mains supply.

In the charging and discharging process, the BEMS host controls and protects the charging and discharging current and voltage, prevents the battery pack from being overcharged and overdischarged, protects the charging and discharging of the battery to the maximum extent, and prolongs the service life of the battery. Meanwhile, the battery monitoring system is continuously communicated with the outside, monitors the state of the battery in real time, and enables maintenance personnel to comprehensively know the parameters of the battery, so that the battery can be maintained more conveniently.

In addition, the BEMS system also continuously monitors the charging of new energy, the voltage, the current and the like of a mains supply, when the new energy supplies power, the switch SWD is switched on, the switch SWE is switched off, and the new energy is preferentially used for supplying power to the equipment and charging the battery pack; when the new energy is insufficient in power supply, the switch SWD and the switch SWE are simultaneously conducted, and the new energy and the commercial power supply power the equipment battery together; when no new energy is supplied, the switch SWD is turned off, the switch SWE is turned on, and the commercial power supplies power to the equipment; when no commercial power is available, the switch SWD is switched on, the switch SWE is switched off, and the new energy and the standby power supply power to the equipment; when the new energy and the commercial power are unavailable, the switch SWD and the switch SWE are turned off; the equipment is powered by the standby power supply.

Referring to fig. 6, the BEMS host 200 includes a main control MCU, a voltage boosting circuit and a voltage dropping circuit, and the voltage boosting circuit and the voltage dropping circuit are respectively electrically connected to the main control MCU.

It should be noted that, when there is commercial power, the BEMS system is in a charging state, the charger performs voltage conversion through the BEMS host and then charges the battery pack, the current direction flows from the charger end to the battery pack end, the main control MCU sends a PWM signal, the step-down circuit operates, the step-up circuit does not operate, and at this time, the circuit is a step-down circuit. When no commercial power is available, the BEMS system is in a discharging state, the battery pack discharges for the load, the current direction flows from the battery pack end to the load end, the main control MCU sends out a PWM signal, the boosting circuit works, and the circuit which does not work when the voltage reduction voltage is the boosting circuit.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A battery management system of a photovoltaic energy storage standby power supply of a mobile base station is characterized by comprising:

2. The system of claim 1, wherein the charging device comprises a new energy charger and a base station charger, and the new energy charger and the base station charger are electrically connected to the BEMS host and the load, respectively.

3. The battery management system of the photovoltaic energy storage backup power supply of the mobile base station as claimed in claim 1, characterized in that the switch circuit comprises a first switch and a second switch, one end of the first switch is electrically connected with the overall positive end of the battery unit, the other end of the first switch is electrically connected with one end of the second switch, the other end of the second switch is electrically connected with the overall negative end of the battery unit, and the other end of the second switch is also used for electrically connecting with the second switch of another battery unit.

4. The battery management system of the photovoltaic energy storage backup power supply of the mobile base station as claimed in claim 3, wherein the first switch comprises a resistor R101, a resistor R102 and a MOS transistor Q101, the D pole of the MOS transistor Q101 is connected with the overall positive terminal of the battery unit, the S pole of the MOS transistor Q101 is electrically connected with the second switch, and the G pole of the MOS transistor Q101 is used for electrically connecting with the sampling plate.

5. The battery management system of the photovoltaic energy storage standby power supply of the mobile base station as claimed in claim 3, wherein the second switch comprises a resistor R103, a resistor R104 and a MOS transistor Q102, the D pole of the MOS transistor Q102 is electrically connected with the first switch, the S pole of the MOS transistor Q102 is connected with the overall negative end of the battery unit, and the G pole of the MOS transistor Q102 is used for electrically connecting with the sampling plate.

6. The battery management system of the photovoltaic energy storage standby power supply of the mobile base station as claimed in claim 1, wherein the equalizing circuit comprises an inductor L101, a MOS transistor Q103 and a MOS transistor Q104, a D pole of the MOS transistor Q103 is connected to the overall positive terminal of the battery unit, an S pole of the MOS transistor Q103 is respectively connected to one end of the inductor L101 and a D pole of the MOS transistor Q104, the other end of the inductor L101 is electrically connected to a connection node of two series-connected single batteries, an S pole of the MOS transistor Q104 is connected to the overall negative terminal of the battery unit, and G poles of the MOS transistor Q103 and the MOS transistor Q104 are respectively electrically connected to the sampling board.

7. The battery management system of the photovoltaic energy storage standby power supply of the mobile base station as claimed in claim 1, wherein the battery pack is provided in plurality, the BEMS host is provided in plurality, and each BEMS host is electrically connected with one battery pack in a one-to-one correspondence manner.

8. The battery management system of the photovoltaic energy storage standby power supply of the mobile base station as claimed in claim 7, further comprising a balancing controller, wherein the balancing controller is electrically connected to each battery pack and the BEMS host respectively, and the balancing controller is further connected to the BEMS host in a communication manner.

9. The battery management system of the photovoltaic energy storage standby power supply of the mobile base station as claimed in claim 1, wherein adjacent two sampling boards are in communication connection with each other.

10. The battery management system of the photovoltaic energy storage backup power supply of the mobile base station as claimed in claim 1, further comprising a wireless communication module electrically connected with the BEMS host.