CN113258654A - Echelon battery device, echelon battery system and echelon battery system control method - Google Patents
Echelon battery device, echelon battery system and echelon battery system control method Download PDFInfo
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- CN113258654A CN113258654A CN202110713778.7A CN202110713778A CN113258654A CN 113258654 A CN113258654 A CN 113258654A CN 202110713778 A CN202110713778 A CN 202110713778A CN 113258654 A CN113258654 A CN 113258654A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
Abstract
The invention discloses a echelon battery device, a system and a echelon battery system control method, wherein the echelon battery device comprises a bus and a first power supply module, the first power supply module comprises a monitoring module and a plurality of bidirectional DC-DC modules, one end of each bidirectional DC-DC module is electrically connected with the bus, the other end of each bidirectional DC-DC module is electrically connected with a corresponding first battery module, and each bidirectional DC-DC module is used for acquiring battery parameter information of the corresponding first battery module and actively charging/discharging the first battery module; the monitoring module is in communication connection with all the bidirectional DC-DC modules to acquire battery parameter information of all the first battery modules, and adjusts the charging/discharging parameters of all the bidirectional DC-DC modules according to the battery parameter information of all the first battery modules; the invention can adjust the charging/discharging parameters of each battery module so as to utilize the battery modules with different voltage grades, avoid the mutual charging among the battery modules caused by different voltage grades of the battery modules and effectively avoid the electric energy loss.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a echelon battery device, a echelon battery system and a echelon battery system control method.
Background
With the continuous increase of the load in the machine room station of the high-capacity lead-acid battery stock, the system cannot stably run due to insufficient power supply of the machine room, and if the cost is too high after reconstruction. If a simple battery switching manager is utilized, the defects that the batteries in the echelons are charged mutually and energy is wasted exist by switching through a thyristor or a contactor, and the batteries in the echelons are uneven and cannot be utilized by batteries in different voltage grades. Therefore, the echelon battery system can be used for expanding the capacity of the machine room, so that the transformation cost is reduced, echelon batteries with different voltage grades can be fully utilized, mutual charging among the batteries is avoided, the batteries can be controlled to be charged at the peak value discharging valley value of the power grid, and the effect of saving the electric charge is achieved. In the application of the base station, the system can operate with the direct-current power supply equipment of the old base station without communication, so that the construction difficulty of transforming the old base station is simplified.
Disclosure of Invention
The invention aims to provide a echelon battery device, a echelon battery system and a echelon battery system control method, which can independently adjust the charging/discharging parameters of each battery module so as to fully utilize the battery modules with different voltage grades, avoid the mutual charging among the battery modules caused by the different voltage grades of the battery modules and effectively avoid the electric energy loss.
In order to achieve the purpose, the invention discloses a echelon battery device which comprises a bus and a first power supply module, wherein the first power supply module comprises a monitoring module and a plurality of bidirectional DC-DC modules, one end of each bidirectional DC-DC module is electrically connected with the bus, the other end of each bidirectional DC-DC module is electrically connected with a corresponding first battery module, all the bidirectional DC-DC modules are arranged in parallel through the bus, and the bidirectional DC-DC modules are used for acquiring battery parameter information of the corresponding first battery modules and actively charging/discharging the first battery modules; the monitoring module is in communication connection with all the bidirectional DC-DC modules to acquire the battery parameter information of all the first battery modules, and adjusts the charging/discharging parameters of all the bidirectional DC-DC modules according to the battery parameter information of all the first battery modules.
Preferably, the first battery module is a lithium battery pack, the lithium battery pack comprises a lithium battery unit and a BMS unit in communication connection with the lithium battery unit, and the BMS unit can acquire battery parameter information of the lithium battery unit.
Correspondingly, the invention also discloses a echelon battery system which comprises a echelon battery device and a second power supply module, wherein the echelon battery device is as described above, the second power supply module comprises a switch module and an acquisition module, one end of the switch module is electrically connected with the bus, the other end of the switch module is used for electrically connecting a second battery module, the switch module selectively electrically connects the second battery module with the bus and charges/discharges the second battery module, and the acquisition module is used for acquiring battery parameter information of the second battery module.
Preferably, the echelon battery system further includes a master control module, the master control module is in communication connection with the monitoring module, the switch module and the acquisition module, the DC-DC module is further configured to monitor a real-time voltage value of the bus, and the master control module can receive battery parameter information of all the first battery modules, battery parameter information of the second battery module and the real-time voltage value of the bus, and assist in adjusting a charging/discharging parameter of each bidirectional DC-DC module, on/off of the switch module and a charging/discharging action of the switch module on the second battery module, so as to stabilize a current of the bus at a preset current threshold.
Preferably, the switching module may adjust a charge/discharge current of the second battery module.
Preferably, the echelon battery system further comprises an AC-DC module and a communication equipment load module, the AC-DC module and the communication equipment load module are respectively electrically connected with the bus, and the AC-DC module is used for an external electric equipment to electrically connect with the bus.
Preferably, the second battery module is a lead-acid battery pack.
Correspondingly, the invention also discloses a echelon battery system control method, which is applied to the echelon battery system and comprises the following steps:
s1, each bidirectional DC-DC module acquires battery parameter information of a corresponding first battery module and acquires a real-time voltage value of a bus, and the acquisition module acquires battery parameter information of a second battery module;
s2, the monitoring module adjusts the charging/discharging parameters of all bidirectional DC-DC modules according to the battery parameter information of all first battery modules;
s3, the master control module obtains battery parameter information of all the first battery modules, battery parameter information of the second battery modules and real-time voltage values of the buses, and assists in adjusting charging/discharging parameters of each bidirectional DC-DC module, on/off of the switch module and charging/discharging actions of the switch module on the second battery modules, so that currents of the buses are stabilized at preset current thresholds.
Preferably, the battery parameter information includes a battery health degree, and the step S2 specifically includes:
s21, the monitoring module sorts all the first battery modules according to the battery health degrees to obtain a battery health degree sorting table;
and S22, the monitoring module adjusts the charging/discharging current of the bidirectional DC-DC modules to the corresponding first battery modules according to the battery health degree sorting table, so that all the first battery modules are charged/discharged in a differentiated manner.
Preferably, the bidirectional DC-DC module has a charge/discharge coefficient, and the monitoring module adjusts the charge/discharge current of the bidirectional DC-DC module by adjusting the charge/discharge coefficient of the bidirectional DC-DC module.
Compared with the prior art, the invention can independently adjust the charging/discharging parameters of each battery module so as to fully utilize the battery modules with different voltage grades, avoid the mutual charging among the battery modules caused by the different voltage grades of the battery modules and effectively avoid the electric energy loss.
Drawings
FIG. 1 is a schematic structural view of a stepped battery system of the present invention;
FIG. 2 is a schematic diagram of the control loop of the echelon battery system of the present invention;
FIG. 3 is a schematic view of yet another configuration of the stepped battery system of the present invention;
fig. 4 is a flow chart diagram of a echelon battery system control method of the present invention.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1 and fig. 3, the echelon battery system of the present embodiment includes a echelon battery device 10 and a second power supply module 20, where the second power supply module 20 is a base station. The echelon battery device 10 comprises a bus 11 and a first power supply module 12, the first power supply module 12 comprises a monitoring module 122 and a plurality of bidirectional DC-DC modules 121, one end of each bidirectional DC-DC module 121 is electrically connected with the bus 11, the other end of each bidirectional DC-DC module 121 is electrically connected with the corresponding first battery module 1, all the bidirectional DC-DC modules 121 are arranged in parallel through the bus 11, and the bidirectional DC-DC modules 121 are used for acquiring battery parameter information of the corresponding first battery modules 1 and actively charging/discharging the first battery modules 1.
The first Battery module 1 is a lithium Battery pack 101, the lithium Battery pack 101 includes a lithium Battery unit and a BMS (Battery Management System) unit communicatively connected to the lithium Battery unit, and the BMS unit 102 may collect Battery parameter information of the lithium Battery unit. Since battery parameters such as battery health, percentage of remaining battery charge, etc. of different lithium battery packs 101 are often inconsistent, a voltage gradient exists between the lithium battery packs 101. The bidirectional DC-DC module 121 of this embodiment is configured to collect battery parameter information of corresponding first battery modules 1, and actively charge/discharge the first battery modules 1, and is capable of independently adjusting charge/discharge parameters according to the battery parameter information of each first battery module 1.
It can be understood that the bidirectional DC-DC module 121 of this embodiment is an intelligent DC-DC module with charging and discharging functions, and a control chip is disposed inside the module, so that the charging/discharging parameters can be dynamically adjusted according to the real-time battery parameter information of the first battery module 1, and mutual charging between different first battery modules 1 is avoided. The bidirectional DC-DC module 121 is provided with a first communication port 1211, and the bidirectional DC-DC module 121 is communicatively connected to the BMS unit 102 of the corresponding first battery module 1 through the first communication port 1211 to read the battery parameter information of the first battery module 1.
The monitoring module 122 is communicatively connected to all the bidirectional DC-DC modules 121 to obtain the battery parameter information of all the first battery modules 1, and adjust the charging/discharging parameters of all the bidirectional DC-DC modules 121 according to the battery parameter information of all the first battery modules 1. Specifically, the bidirectional DC-DC module 121 is further provided with a second communication port 1212, the monitoring module 122 is provided with a third communication port 1221, the bidirectional DC-DC module 121 is communicatively connected to the monitoring module 122 through the second communication port 1212 and the third communication port 1221 to send the battery parameter information of the first battery module 1 to the monitoring module 122, and the monitoring module 122 adjusts the charging/discharging parameters of all the bidirectional DC-DC modules 121 according to the received battery parameter information of all the first battery modules 1 to adjust the working mode of the echelon battery device 10.
Referring to fig. 1, a second power supply module 20 of this embodiment includes a switch module 21 and an acquisition module 22, one end of the switch module 21 is electrically connected to a bus 11, and the other end is used for electrically connecting to a second battery module 2, the second battery module 2 of this embodiment is a lead-acid battery pack, and may be a large number of lead-acid battery packs in a stock room in a base station, and the total battery capacity of a echelon battery system is increased by sharing a large number of lead-acid battery packs in the stock room, so that transformation-free of a large-capacity lead-acid battery in the stock room station can be achieved. The switch module 21 selectively electrically connects the second battery module 2 to the bus bar 11 and charges/discharges the second battery module 2, and preferably, the switch module 21 of the present embodiment may adjust the charge/discharge current of the second battery module 2. The collecting module 22 is used for collecting the battery parameter information of the second battery module 2.
Preferably, the echelon battery system further includes a master control module 23, the monitoring module 122 further includes a fourth communication port 1222, the DC-DC module 121 is further configured to monitor a real-time voltage value of the bus 11, the master control module 23 includes a fifth communication port 231, the master control module 23 is communicatively connected to the monitoring module 122 through the fourth communication port 1222 and the fifth communication port 231, the master control module 23 can receive all the battery parameter information of the first battery module 1, the battery parameter information of the second battery module 2, and the real-time voltage value of the bus 11, and assist in adjusting the charging/discharging parameter of each bidirectional DC-DC module 121, the on/off of the switch module 21, and the charging/discharging action of the switch module 21 on the second battery module 2, so as to stabilize the current of the bus 11 at the preset current threshold. At this time, the general control module 23 may further plan the charging/discharging parameters of all the first battery modules 1 and the second battery modules 2 in combination with the battery parameter information of the second battery module 2 and the real-time voltage value of the bus 11 on the basis of the monitoring module 122, so as to ensure that the current of the bus 11 is constant.
The operation modes of the echelon battery device 10 of the present embodiment include a common charge and discharge mode, a priority charge and discharge mode, a peak clipping and valley filling mode, and a battery capacity mode:
in the common charge and discharge mode, the monitoring module 122 sets the charge/discharge parameters of each bidirectional DC-DC module 121 to be consistent, so that all the first battery modules 1 have the same charge/discharge current;
in the preferential charge-discharge mode, the monitoring module 122 first sorts all the first battery modules 1 according to the battery health degrees to obtain a battery health degree sorting table; the monitoring module 122 adjusts the charging/discharging current of all the bidirectional DC-DC modules 121 to the corresponding first battery modules 1 according to the battery health degree sorting table, so that all the first battery modules 1 are charged/discharged in a differentiated manner, and if the battery health degree is higher, the charging/discharging current of the first battery module 1 is higher, so that the charging/discharging current of all the first battery modules 1 is set in a gradient manner. This mode enables adjustment of the charge/discharge parameters of the bidirectional DC-DC module 121 according to the degree of aging of each first battery module 1, the first battery module 1 having the lower degree of aging being charged/discharged preferentially;
in the automatic charging and discharging mode, the monitoring module 122 adjusts the charging/discharging power of the corresponding bidirectional DC-DC module 121 according to the battery health degree of the first battery module 1, specifically, the charging/discharging power of the bidirectional DC-DC module 121 is the product of the total output power of the bidirectional DC-DC module 121, the percentage of the remaining battery capacity of the battery corresponding to the first battery module 1, the battery health degree of the corresponding first battery module 1, and the discharging capacity coefficient K of the corresponding first battery module 1, and the discharging capacity coefficient of all the first battery modules 1 is calculated to realize the synchronous discharging capacity of all the first battery modules 1;
in the peak clipping and valley filling mode, the monitoring module 122 presets the peak value and the valley time period of the electricity price, the monitoring module 122 controls all the first battery modules 1 to discharge in the peak value time period of the electricity price, and to charge in the valley time period, and the flat time period can be set as charging or non-discharging; when the base station is powered off, the monitoring module 122 automatically stops the peak clipping and valley filling mode, and when the utility power is restored, the monitoring module 122 controls all the first battery modules 1 to restore the peak clipping and valley filling mode after being fully charged. Specifically, the echelon battery device 10 monitors the real-time voltage value of the bus 11 in real time, when the commercial power is at a peak value, the master control module 23 automatically matches the power according to the real-time voltage value of the bus 11 to adjust the real-time voltage value of the bus 11 to the uniform charging voltage of the second battery module 2, and by collecting the current of the second battery module 2, the second battery module 2 is not charged under the premise of ensuring the load; when the commercial power is at a valley value, the main control module 23 automatically matches the power according to the real-time voltage value of the bus 11 to adjust the real-time voltage value of the bus 11 to the float charging voltage of the second battery module 2, and the first battery modules 1 are charged on the premise that the load and the second battery modules 2 are not charged, so that energy waste caused by mutual charging and discharging with the second battery modules 2 is prevented, and overcharging of the external second battery modules 2 is prevented;
in the battery capacity checking mode, the monitoring module 122 periodically performs discharge capacity checking on all the first battery modules 1, and estimates the actual capacities of all the first battery modules 1 according to the battery types and capacities of all the first battery modules 1 and voltage and current data in historical discharge records to calculate the battery health degrees; all the first battery modules 1 regularly adjust the discharge current proportion of each first battery module 1 in the common discharge mode according to the actual capacity of the single battery of each first battery module 1, so that the battery health degrees of all the first battery modules 1 gradually tend to be consistent.
Fig. 2 is a schematic diagram of a control loop of the echelon battery system of the present embodiment, wherein the first-stage control loop controls the current of the second battery module 2 to prevent the second battery module 2 of the old base station from being overcharged and prevent the second battery module 2 and the first battery module 1 from being charged and discharged mutually; the second-level control loop realizes peak-load shifting power utilization by controlling the level of the voltage of the bus 11, so that the power-off of the original base station is not influenced, and the stability of the voltage of the bus 11 during the charging/discharging of the first battery module 1 can be met; the different charge/discharge power settings of different first battery modules 1 are met by adjusting the magnitude of the charge/discharge coefficient K of each bi-directional DC-DC module 121 to adjust the charge/discharge power of each first battery module 1. Wherein, the voltage average value of the bus 11 is in an outer ring, and the voltage ring is calculated once only by the current-sharing ring for 10 times.
Preferably, the echelon battery system also includes an AC-DC module 24 and a communications equipment load module 25, where the communications equipment load module 25 is specifically the total load of all the electrical equipment in the base station. The AC-DC module 24 and the communication equipment load module 25 are electrically connected with the bus 11 respectively, and the AC-DC module 24 is used for electrically connecting the bus 11 with external electric equipment.
It should be noted that fig. 1 shows that the second power supply module 20 of this embodiment is connected to the second battery module 2, and is suitable for a storage room station with a large-capacity lead-acid battery, and the total battery capacity of the system is increased by sharing the batteries of the first battery module 1 and the second battery module 2, so that the transformation-free of the large-capacity lead-acid battery of the storage room station can be realized.
In other preferred manners, the switch module 21, the second battery module 2, and the collection module 22 may not access the bus 11 as shown in fig. 3, at this time, the echelon battery system of this embodiment is suitable for a newly-built station and an outdoor cabinet base station, and different first battery modules 1 access the bus 11 through the bidirectional DC-DC module 121, so as to implement the mixed use of the first battery modules 1 with different voltage echelons.
Referring to fig. 4, correspondingly, the present invention further discloses a echelon battery system control method, which is applied to the echelon battery system, and the echelon battery system control method includes the following steps:
s1, each bidirectional DC-DC module 121 acquires battery parameter information of the corresponding first battery module 1 and acquires a real-time voltage value of the bus, and the acquisition module 22 acquires battery parameter information of the second battery module 2;
s2, the monitoring module 122 adjusts the charging/discharging parameters of all bidirectional DC-DC modules 121 according to the battery parameter information of all first battery modules 1;
s3 and the general control module 23 obtain the battery parameter information of all the first battery modules 1, the battery parameter information of the second battery modules 2, and the real-time voltage value of the bus, and assist in adjusting the charging/discharging parameters of each bidirectional DC-DC module 121, the on/off of the switch module 21, and the charging/discharging operation of the switch module 21 on the second battery modules 2, so as to stabilize the current of the bus 11 at the preset current threshold.
Preferably, the battery parameter information includes a battery health degree, and the step S2 specifically includes:
s21, the monitoring module 122 sorts all the first battery modules 1 according to the battery health degrees to obtain a battery health degree sorting table;
s22, the monitoring module 122 adjusts the charging/discharging current of the bidirectional DC-DC module 121 to the corresponding first battery module 1 according to the battery health degree sorting table, so that all the first battery modules 1 are charged/discharged differently.
Preferably, the bidirectional DC-DC module 121 has a charge/discharge coefficient K, and the monitoring module adjusts the charge/discharge current of the bidirectional DC-DC module 121 by adjusting the charge/discharge coefficient K of the bidirectional DC-DC module 121.
With reference to fig. 1-4, the present invention can independently adjust the charging/discharging parameters of each battery module, so as to fully utilize the battery modules with different voltage levels, avoid the mutual charging between the battery modules due to the different voltage levels of the battery modules, and effectively avoid the power loss.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.
Claims (10)
1. A echelon battery device, comprising a bus bar and a first power module, the first power module comprising:
the bidirectional DC-DC modules are used for acquiring battery parameter information of the corresponding first battery module and actively charging/discharging the first battery module;
and the monitoring module is in communication connection with all the bidirectional DC-DC modules so as to acquire the battery parameter information of all the first battery modules, and adjusts the charging/discharging parameters of all the bidirectional DC-DC modules according to the battery parameter information of all the first battery modules.
2. The echelon battery device of claim 1, wherein the first battery module is a lithium battery pack, the lithium battery pack comprises lithium battery cells and a BMS unit communicatively coupled to the lithium battery cells, and the BMS unit is configured to collect battery parameter information of the lithium battery cells.
3. A echelon battery system, comprising a echelon battery device as set forth in any one of claims 1 to 2 and a second power supply module, wherein the second power supply module comprises a switch module and an acquisition module, one end of the switch module is electrically connected with the bus bar, the other end of the switch module is used for electrically connecting a second battery module, the switch module selectively electrically connects the second battery module with the bus bar and charges/discharges the second battery module, and the acquisition module is used for acquiring battery parameter information of the second battery module.
4. The echelon battery system of claim 3, further comprising a master control module, the master control module being communicatively connected to the monitoring module, the switch module and the acquisition module, the DC-DC module being further configured to monitor a real-time voltage value of the bus, the master control module being capable of receiving battery parameter information of all the first battery modules, battery parameter information of the second battery module and the real-time voltage value of the bus, and assisting in adjusting charging/discharging parameters of each bidirectional DC-DC module, on/off of the switch module and charging/discharging operations of the switch module on the second battery module, so as to stabilize the current of the bus at a preset current threshold.
5. The echelon battery system of claim 4, wherein the switch module may regulate a charge/discharge current of the second battery module.
6. The echelon battery system of claim 3, further comprising an AC-DC module and a communications equipment load module, the AC-DC module and the communications equipment load module being electrically connected to the bus, respectively, the AC-DC module being configured to provide electrical connection to the bus for external electrical equipment.
7. The echelon battery system of claim 3, wherein the second battery module is a lead acid battery pack.
8. A echelon battery system control method applied to the echelon battery system according to any one of claims 3 to 7, characterized by comprising the steps of:
each bidirectional DC-DC module acquires battery parameter information of a corresponding first battery module and a real-time voltage value of a bus, and the acquisition module acquires battery parameter information of a second battery module;
the monitoring module adjusts the charging/discharging parameters of all the bidirectional DC-DC modules according to the battery parameter information of all the first battery modules;
the master control module acquires battery parameter information of all the first battery modules, battery parameter information of the second battery modules and real-time voltage values of the buses, and assists in adjusting charging/discharging parameters of each bidirectional DC-DC module, on/off of the switch module and charging/discharging actions of the switch module on the second battery modules, so that currents of the buses are stabilized at preset current thresholds.
9. The echelon battery system control method of claim 8, wherein the battery parameter information includes battery health, and the monitoring module adjusts the charge/discharge parameters of all the bidirectional DC-DC modules according to the battery parameter information of all the first battery modules, specifically including:
the monitoring module sorts all the first battery modules according to the battery health degrees to obtain a battery health degree sorting table;
the monitoring module adjusts the charging/discharging current of all the bidirectional DC-DC modules to the corresponding first battery modules according to the battery health degree sorting table, so that all the first battery modules are charged/discharged in a differentiated mode.
10. The echelon battery system control of claim 8, wherein the bidirectional DC-DC module has a charge/discharge coefficient, and the monitoring module adjusts the charge/discharge current of the bidirectional DC-DC module by adjusting the charge/discharge coefficient of the bidirectional DC-DC module.
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Cited By (1)
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| CN114597991A (en) * | 2022-02-22 | 2022-06-07 | 双登集团股份有限公司 | Battery echelon utilization method for shared electric bicycle |
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| US20050180181A1 (en) * | 2004-02-18 | 2005-08-18 | Gaudreau Marcel P.J. | More compact and higher reliability power source system |
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