CN211150714U

CN211150714U - Floating charge-free storage battery grouping system

Info

Publication number: CN211150714U
Application number: CN201922428711.XU
Authority: CN
Inventors: 梅成林; 刘军; 梁小兵; 张俊峰; 安然然; 刘水; 温云龙
Original assignee: Electric Power Research Institute of Guangdong Power Grid Co Ltd
Current assignee: Electric Power Research Institute of Guangdong Power Grid Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-07-31
Anticipated expiration: 2029-12-27

Abstract

The utility model discloses a floating charge-free storage battery grouping system, which comprises a diode, an IGBT power device, a battery pack and a control module, wherein the diode is connected with the IGBT power device in parallel, the IGBT device is connected with the control module, and the anode of the battery pack is connected with the intersection point of the IGBT power device and the diode; the diode, the IGBT power device, the battery pack and the control module form a storage battery grouping unit, and the system comprises a plurality of groups of storage battery grouping units. The utility model controls the IGBT power device to be switched on, so that the direct current bus charges the battery, and controls the IGBT power device to be switched off after the charging is finished, thereby avoiding the floating charging of the battery pack; compared with the traditional battery pack, the utility model discloses a long-time floating charge need not be carried out to the group battery, has avoided floating charge to the harm of group battery, has improved the life-span of group battery greatly. And moreover, by arranging the diodes, circulation currents cannot be generated among the groups after the multiple groups of storage batteries are grouped.

Description

Floating charge-free storage battery grouping system

Technical Field

The utility model relates to a battery technical field especially relates to a exempt from to float and fill battery system in groups.

Background

The direct current system is an important component of the transformer substation, and a storage battery pack in the direct current system provides safe, stable and reliable power guarantee for a secondary system load in the power system, so that normal operation of control, protection and communication equipment of the transformer substation is ensured. The stability of the battery and the actual capacity that can be supplied to the load during discharge are of great importance to ensure safe operation of the power plant.

The present grouping mode of storage batteries of a power system transformer substation and a power plant is in series connection, when a certain battery fails, the whole battery pack fails, the present battery pack always runs in a mode of being uninterruptedly and directly connected with a bus for floating charging for 24 hours, and the long-term uninterrupted floating charging damages the storage batteries, so that the service life of the storage batteries is shortened, and therefore, the present grouping mode of most storage batteries of the power system has a great problem.

In summary, in the prior art, the grouping manner of most of the storage batteries of the power system has a great problem, which results in the reduction of the service life of the storage battery pack.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model discloses exempt from to float and fill battery system in groups has solved prior art, and there is the technical problem that great problem leads to storage battery's life to reduce in the mode in groups of most electric power system batteries.

The embodiment of the utility model provides a exempt from to float and fill battery system in groups, including diode, IGBT power device, group battery and control module, the diode is connected in parallel with IGBT power device, IGBT device is connected with control module, the positive pole of group battery is connected in the crossing point that IGBT power device and diode are connected; the diode, the IGBT power device, the battery pack and the control module form a storage battery grouping unit, and the system comprises a plurality of groups of storage battery grouping units.

Preferably, in each battery grouping unit, the anode of the diode is connected with the emitter of the IGBT power device, the cathode of the diode is connected with the collector of the IGBT power device, the base of the IGBT power device is connected with the control module, and the anode of the battery pack is connected with the anode of the diode and the emitter of the IGBT power device.

Preferably, the storage battery grouping unit further comprises a voltage and current acquisition module, an output end of the voltage and current acquisition module is connected with the control module, and an acquisition end of the voltage and current acquisition module is connected with the battery pack.

Preferably, the battery pack is formed by connecting a plurality of batteries in series.

Preferably, the control module comprises a processor and a PWM driving circuit, an input end of the PWM driving circuit is connected to an output end of the control module, and an output end of the PWM driving circuit is connected to a base of the IGBT power device.

Preferably, the system further comprises a storage module, and the storage module is connected with the voltage and current acquisition module.

Preferably, the storage module adopts a TF card.

Preferably, the system further comprises a display module, and the display module is connected with the voltage and current acquisition module.

Preferably, the display module is an L CD display.

Preferably, the voltage and current acquisition module is a voltage sensor and a current sensor.

According to the technical solution provided by the utility model, the embodiment of the utility model has the following advantage:

the embodiment of the utility model provides a through the electric capacity that detects the group battery, when the electric quantity of group battery is not enough, control IGBT power device and switch on, direct current bus charges the battery, after the completion of charging, control IGBT power device and turn off, avoided the float charge of group battery; compare with traditional group battery, the embodiment of the utility model provides an in the group battery need not float for a long time and fills, avoided floating to fill the harm to the group battery, improved the life-span of group battery greatly.

The embodiment of the utility model provides a still have following another advantage:

the floating charge-free storage battery grouping system provided by the embodiment of the utility model has the advantages of good convenience and high reliability, when any battery pack fails, other battery packs are not affected, and the failed battery pack can be maintained on line; and when any group of battery pack fails, other battery packs can supply power to the load, so that the reliability of the battery pack is greatly improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a system structure diagram of a floating charge-free battery grouping system and a charging method according to an embodiment of the present invention.

Fig. 2 is an internal structure diagram of a control module of a floating charge-free battery grouping system and a charging method according to an embodiment of the present invention.

Detailed Description

The embodiment of the utility model provides a exempt from to float and fill battery system in groups has solved prior art, and there is the technical problem that great problem leads to storage battery's life to reduce in the mode in groups of most electric power system batteries.

For the condition that the direct current system with double batteries has the circulating current risk caused by the short-time parallel connection of the storage battery packs in the operation and maintenance process of the storage battery, taking the transformer substation direct current system with the double batteries as an example, the direct current system is traditionally configured in such a way that a direct current screen 1# is connected with the storage battery pack 1#, a direct current screen 2# is connected with the storage battery pack 2#, the direct current buses are controlled by a switch, and the direct current buses are mutually used as backup power supplies in the abnormal or maintenance process. When the second direct current system is switched to the first direct current system for standby, in order to avoid the voltage difference between the discharged storage battery pack 1# and a direct current screen 1# or a storage battery pack 2# loop to cause the damage of large current to the direct current system, the bus needs to be controlled to be switched on, the direct current screen 1# is withdrawn, the storage battery pack 1# is withdrawn, and the direct current screen 2# plays a role in supplying power to a standby power supply of the first direct current system. After discharging, manually adjusting the direct current screen 1# to reduce charging voltage, gradually increasing the output voltage of the direct current screen, charging the storage battery pack 1# and re-connecting the direct current screen 1# and the storage battery pack 1# into the system after full charging, controlling the disconnection of the bus and the power bus and recovering the connection of the original system before discharging.

The condition that the storage batteries are directly connected in parallel occurs during standby access and standby exit, and the operation personnel can only connect in parallel for a short time by ensuring that the differential pressure of the direct current system is less than 2V. When voltage difference exists between the two groups of battery terminal voltages which are directly connected in parallel, the high-voltage battery pack discharges to the low-voltage battery pack, and a circulation current is generated. The larger the difference of the internal resistances of the storage battery packs is, the larger the voltage difference is, and the larger the circulating current is. Even a short circulation process can seriously affect the service life of the battery, and even can cause damage to the battery.

Referring to fig. 1, an embodiment of a floating charge-free battery grouping system provided in an embodiment of the present invention includes:

as shown in fig. 1, a floating charge-free battery grouping system comprises a diode 2, an IGBT power device 1, a battery pack 4 and a control module 3, wherein the diode 2 is connected in parallel with the IGBT power device 1, the IGBT device is connected with the control module 3, and the anode of the battery pack 4 is connected to the intersection point of the IGBT power device 1 and the diode 2; the diode 2, the IGBT power device 1, the battery pack 4 and the control module 3 form a storage battery grouping unit, and the system comprises a plurality of groups of storage battery grouping units.

When the system is used, the anode of the direct current bus 6 is connected with the diode 2 and the IGBT power device 1, the cathode of the direct current bus 6 is connected with the cathode of the battery pack 4, a worker controls the on and off of the IGBT power device 1 through the control module 3, when the IGBT power device 1 is switched on, the battery pack 4 starts to charge, when the IGBT power device 1 is switched off, the battery pack 4 stops charging, the charging process of the battery pack 4 is realized by controlling the IGBT power device 1, at the moment, the battery pack 4 is in a full charge and self-discharge condition, after the IGBT is switched off, due to the characteristics of the battery, the electromotive force value of the battery is lower than the voltage value output by the direct current bus 6, the battery pack is in a self-discharge and non-floating charge mode, in the system, each battery pack 4 can independently monitor and control voltage and current, and the charging and discharging between each battery pack 4 are not influenced, and no circulation current is generated between the plurality of sets of battery cells due to the characteristics of the diodes 2.

In each battery grouping unit, the anode of the diode 2 is connected with the emitter of the IGBT power device 1, the cathode of the diode 2 is connected with the collector of the IGBT power device 1, the base of the IGBT power device 1 is connected with the control module 3, and the anode of the battery pack 4 is connected with the anode of the diode 2 and the emitter of the IGBT power device 1.

As a preferred embodiment, the storage battery grouping unit further includes a voltage and current acquisition module 5, an output end of the voltage and current acquisition module 5 is connected with the control module 3, an acquisition end of the voltage and current acquisition module 5 is connected with the battery pack 4, voltage and current data of the battery pack 4 are acquired through the voltage and current acquisition module 5, and a worker judges whether the battery pack 4 is fully charged according to the voltage and current data, so as to control the IGBT power device 1 to realize a charging process of the battery pack 4.

As a preferred embodiment, the battery pack 4 is formed by connecting a plurality of batteries in series, the number of the batteries connected in series is related to the voltage level output by the dc bus 6, and generally 52 to 54 lead-acid batteries (a dc power system with a nominal voltage of 110V) or 104 to 108 lead-acid batteries (a dc power system with a nominal voltage of 220V) are required, different battery packs 4 may be different types of batteries, for example, a first battery pack is a lead-acid battery, and a second battery pack is a lithium iron phosphate battery;

as a preferred embodiment, as shown in fig. 2, the control module 3 includes a processor 7 and a PWM driving circuit 8, an input terminal of the PWM driving circuit 8 is connected to an output terminal of the processor 7, and an output terminal of the PWM driving circuit 8 is connected to the base of the IGBT power device 1. The worker controls the output level of the PWM output circuit 8 through the processor 7, when the PWM drive circuit 8 outputs a high level, the IGBT power device 1 is turned on, and when the PWM drive circuit 8 outputs a low level, the IGBT power device 1 is turned off, so that the IGBT power device 1 is controlled to be turned on and off through the PWM drive circuit 8.

As a preferred embodiment, the system further comprises a storage module 9, and the storage module 9 is connected with the output end of the voltage and current collection module 5. The storage module 9 is used for storing the acquired data, so that later-stage workers can call the data conveniently.

As a preferred embodiment, the storage module 9 uses a TF card.

As a preferred embodiment, the system further includes a display module 10, the display module 10 is connected to the voltage and current collecting module 5, and the display module 10 displays data collected by the voltage and current collecting module 5 in the display module 10, so that a worker can observe the collected data conveniently.

As a preferred embodiment, the display module 10 is an L CD display.

As a preferred embodiment, the voltage and current collection module 5 is a voltage sensor and a current sensor, the voltage sensor is responsible for collecting voltage data, and the current sensor is responsible for collecting current data.

It is right above the utility model provides an exempt from to float and fill battery system in groups and introduced in detail, to the general technical personnel in this field, according to the utility model discloses the thought, all have the change part on concrete implementation and application scope, to sum up, this description content should not be understood as right the utility model discloses a restriction.

Claims

1. A floating charge-free storage battery grouping system is characterized by comprising a diode, an IGBT power device, a battery pack and a control module, wherein the diode is connected with the IGBT power device in parallel, the IGBT power device is connected with the control module, and the anode of the battery pack is connected with the intersection point of the IGBT power device and the diode; the diode, the IGBT power device, the battery pack and the control module form a storage battery grouping unit, and the system comprises a plurality of groups of storage battery grouping units.

2. The float-free battery grouping system as claimed in claim 1, wherein in each battery grouping unit, the anode of the diode is connected with the emitter of the IGBT power device, the cathode of the diode is connected with the collector of the IGBT power device, the base of the IGBT power device is connected with the control module, and the anode of the battery group is connected with the anode of the diode and the emitter of the IGBT power device.

3. The system of claim 2, wherein the battery grouping unit further comprises a voltage and current collecting module, an output end of the voltage and current collecting module is connected with the control module, and a collecting end of the voltage and current collecting module is connected with the battery pack.

4. The float-free battery grouping system of claim 3 wherein the battery pack is formed by a plurality of cells connected in series.

5. The float-free battery grouping system of claim 4 wherein the control module comprises a processor and a PWM drive circuit, wherein an input of the PWM drive circuit is connected to an output of the control module, and an output of the PWM drive circuit is connected to the base of the IGBT power device.

6. The float-free battery grouping system of claim 5, further comprising a storage module connected to the voltage and current acquisition module.

7. The float-free battery grouping system of claim 6 wherein the storage module is a TF card.

8. The system of claim 6, further comprising a display module, wherein the display module is connected to the voltage and current acquisition module.

9. The float-free battery grouping system of claim 8 wherein the display module is an L CD display.

10. The float-free battery grouping system of claim 4 wherein the voltage and current acquisition module is a voltage sensor and a current sensor.