CN114614114A - Mobile unattended lithium secondary battery pack storage and maintenance system and method - Google Patents
Mobile unattended lithium secondary battery pack storage and maintenance system and method Download PDFInfo
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- CN114614114A CN114614114A CN202011447587.2A CN202011447587A CN114614114A CN 114614114 A CN114614114 A CN 114614114A CN 202011447587 A CN202011447587 A CN 202011447587A CN 114614114 A CN114614114 A CN 114614114A
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- secondary battery
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- 238000012423 maintenance Methods 0.000 title claims abstract description 290
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 139
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 139
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000007600 charging Methods 0.000 claims abstract description 55
- 238000007599 discharging Methods 0.000 claims abstract description 53
- 238000012544 monitoring process Methods 0.000 claims abstract description 27
- 238000004146 energy storage Methods 0.000 claims abstract description 18
- 230000003993 interaction Effects 0.000 claims abstract description 7
- 238000004891 communication Methods 0.000 claims description 24
- 238000004378 air conditioning Methods 0.000 claims description 12
- 230000007613 environmental effect Effects 0.000 claims description 11
- 239000000178 monomer Substances 0.000 claims description 6
- 238000009825 accumulation Methods 0.000 claims description 2
- 230000010354 integration Effects 0.000 claims description 2
- 230000007774 longterm Effects 0.000 abstract description 7
- 230000000737 periodic effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012983 electrochemical energy storage Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000036449 good health Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- UKACHOXRXFQJFN-UHFFFAOYSA-N heptafluoropropane Chemical compound FC(F)C(F)(F)C(F)(F)F UKACHOXRXFQJFN-UHFFFAOYSA-N 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a mobile unattended lithium secondary battery pack storage and maintenance system and a method, belonging to the technical field of lithium secondary battery pack energy storage, and comprising an energy storage shelter, a shelter maintenance terminal, a balance maintenance platform and a charging and discharging maintenance platform, wherein the shelter maintenance terminal, the balance maintenance platform and the charging and discharging maintenance platform are arranged in the energy storage shelter; the balance maintenance platform is used for carrying out electric quantity balance control on the lithium secondary battery pack; the charging and discharging maintenance platform is used for controlling charging and discharging of the lithium secondary battery pack; the shelter maintenance terminal is used for communicating with a battery management system of the lithium secondary battery pack, reading state information in the battery pack and finishing storage monitoring of the lithium secondary battery pack; and the balance maintenance and the charge and discharge maintenance management are realized through data interaction with the balance maintenance platform and the charge and discharge maintenance platform respectively. The invention monitors and controls the cabin environment condition, can carry out automatic function management on the balance maintenance platform and the charge-discharge maintenance platform, and completes the long-term storage and the regular maintenance work of the lithium secondary battery pack under the unattended condition.
Description
Technical Field
The invention discloses a mobile unattended lithium secondary battery pack storage and maintenance method, belongs to the field of secondary batteries, and particularly relates to an electrochemical energy storage system shelter of lithium secondary battery packs comprising lithium iron phosphate, ternary lithium and the like and a lithium secondary battery pack maintenance technology.
Background
The application field of the lithium secondary battery pack relates to land transportation, underwater robots, aerospace, energy storage application and the like. In the application scenario of a lithium secondary battery, the battery may be stored for a long period of time and used only at a high density for a certain period of time. In the field of military industry, underwater robots, aerospace and other equipment, the lithium secondary battery pack is used, and the use work of the lithium secondary battery pack is carried out around the mission of the equipment. After the mission is completed, the lithium secondary battery pack is in a standby state. In such an application environment, it is necessary to consider the problems of long-term storage and periodic maintenance of the lithium secondary battery.
When the lithium secondary battery pack is stored for a long time, firstly, the safety of the lithium secondary battery pack is ensured, and then, the storage environment condition is controlled, so that the natural aging process of the lithium secondary battery pack is delayed as much as possible. The storage environment of the lithium secondary battery pack generally requires a temperature of 5 ℃ to 30 ℃, a relative humidity of 40% to 70%, and an atmospheric pressure of 86 kPa to 106 kPa. The aging and self-discharge of the lithium secondary battery pack during the storage period can be effectively controlled by controlling the temperature and the humidity, and partial paper data show that the storage performance of the lithium secondary battery pack at the temperature range of 15-25 ℃ is kept better.
And secondly, the periodic maintenance of the lithium secondary battery pack needs to be considered. The time interval of maintenance work is generally 3 to 6 months, and the maintenance work can be basically operated as charging-discharging-charging operation by taking a single battery, a battery module or a battery pack as a unit. The lithium secondary battery is charged to full charge; then emptying the electric quantity of the lithium secondary battery; and finally, charging the lithium secondary battery to the target electric quantity for continuous storage. The current for charging and discharging maintenance is generally below 0.2C to ensure that the lithium secondary battery can reach a full-charge state.
The maintenance work of the lithium secondary battery pack also comprises balanced maintenance, and the problem of inconsistent monomer electric quantity of the lithium secondary battery pack after long-term use or storage is caused by different internal resistance and self-discharge rate of the lithium secondary battery pack. At this time, it is necessary to uniformly perform the balance maintenance on the entire lithium secondary battery pack. The balance maintenance generally takes the single battery as a unit, and all the single batteries are uniformly charged and discharged, the current is generally below 0.1C, and the single batteries are uniformly charged and discharged to the same voltage or the same electric quantity.
Disclosure of Invention
The method of the invention is a mobile unattended lithium secondary battery storage and maintenance method aiming at a lithium secondary battery which is in a storage state for a long time or has low use frequency.
The invention aims to avoid the defects of the prior art, provide a movable unattended automatic storage and maintenance condition of a lithium secondary battery pack, ensure that the lithium secondary battery pack can ensure good health state even in the unused state, and can monitor all state information in the battery pack within 24 hours
The purpose of the invention is realized by the following technical scheme: a mobile unattended lithium secondary battery pack storage and maintenance system comprises an energy storage square cabin, a square cabin maintenance terminal, a balance maintenance platform and a charging and discharging maintenance platform, wherein the square cabin maintenance terminal, the balance maintenance platform and the charging and discharging maintenance platform are arranged in the energy storage square cabin;
the balance maintenance platform is used for carrying out electric quantity balance control on the lithium secondary battery pack;
the charging and discharging maintenance platform is used for controlling charging and discharging of the lithium secondary battery pack;
the shelter maintenance terminal is used for communicating with a battery management system of the lithium secondary battery pack, reading state information in the battery pack and finishing storage monitoring of the lithium secondary battery pack; and the balance maintenance and the charge and discharge maintenance management are realized through data interaction with the balance maintenance platform and the charge and discharge maintenance platform respectively.
And a shelter matching unit comprising a power distribution unit, a fire protection unit, an air conditioning unit, a fresh air unit, a video monitoring unit and a grounding lightning protection unit is arranged in the energy storage shelter.
The balance maintenance platform comprises: the device comprises a control unit and M battery module balance maintenance instruments connected with the control unit, wherein M is more than or equal to the number of single battery modules in a battery cluster;
and the balance control unit is used for controlling the balance maintenance work of the lithium secondary battery pack as a whole or less than M battery modules according to the balance maintenance parameters and the start-stop command of the shelter maintenance terminal.
The charge and discharge maintenance platform comprises a charge and discharge control unit and a charge and discharge maintenance power supply connected with the charge and discharge control unit, and is used for performing charge and discharge maintenance within a set current range on the whole lithium secondary battery pack according to charge and discharge maintenance parameters and start and stop commands of the shelter maintenance terminal; wherein, discharge adopts the feedback electric wire netting mode to reduce the heat accumulation in the shelter.
The system also comprises a remote system management platform which is used for being remotely connected with at least one shelter maintenance terminal in a wired or wireless communication mode to monitor and control so as to complete the integration and analysis of the lithium secondary battery pack data.
A mobile unattended lithium secondary battery pack storage and maintenance method is characterized in that a shelter maintenance terminal interacts with discrete signals and data of a power distribution unit, a fire protection unit, an air conditioning unit and a fresh air unit in an energy storage shelter according to the actual working condition of a system in three modes of a storage mode, a charge-discharge maintenance mode and a balanced maintenance mode to complete system safety monitoring and environmental condition control.
A mobile unattended lithium secondary battery pack storage and maintenance method includes the following steps:
during storage of the lithium secondary battery, the system is in storage mode: the shelter maintenance terminal is used for powering on and powering off a battery management system in the lithium secondary battery pack at regular time, and reading the state information of the lithium secondary battery pack through communication with the battery management system; meanwhile, the shelter maintenance terminal keeps continuous communication with the remote system management platform, and uploads environmental information and lithium secondary battery pack state information acquired by a shelter matching unit in the system in real time; when the shelter maintenance terminal judges that the storage time of the lithium secondary battery pack meets the requirement of the charging and discharging maintenance time interval, the system automatically exits the storage mode and enters the charging and discharging maintenance mode.
When the system enters a charge-discharge maintenance mode, the shelter maintenance terminal controls the battery management system to be powered on and the charge-discharge maintenance platform to be powered on, reads the state information of the lithium secondary battery pack, loads and configures a charge-discharge maintenance curve according to the state information of the current lithium secondary battery pack, and controls the charge-discharge maintenance platform to execute; and after the charging and discharging maintenance work is finished, the shelter maintenance terminal controls the battery management system and the charging and discharging maintenance power supply to be powered off and automatically enters a storage mode.
During the storage period or the charging and discharging maintenance period of the lithium secondary battery pack, the shelter maintenance terminal sets a threshold value according to the voltage of the monomers in the lithium secondary battery pack, and compares the maximum pressure difference between the monomers with the set threshold value; when the maximum pressure difference between the single batteries is larger than a threshold value, the lithium secondary battery pack has the problem of unbalanced electric quantity, and the system automatically enters a balance maintenance mode;
after the system enters a balance maintenance mode, the shelter maintenance terminal firstly controls the balance maintenance platform to be powered on, and determines the number of balance maintenance instruments in the platform, the number of on-line battery modules and the state information of the on-line battery modules through data interaction with the balance maintenance platform;
the shelter maintenance terminal configures the balance maintenance parameters according to the information and executes balance maintenance work; and when the balance maintenance work is finished, the shelter maintenance terminal controls the balance maintenance platform to be powered off and automatically enters a storage mode.
The remote system management platform completes remote communication with at least one shelter maintenance terminal in a wired or wireless communication mode; remotely completing the work of storage monitoring, charging and discharging maintenance and balanced maintenance of the lithium secondary battery pack, and recording the data of the lithium secondary battery pack in all energy storage cabins in a period of time during maintenance and storage; and monitoring the state information of the lithium secondary battery pack through a remote system management platform, and directly controlling the charging and discharging maintenance and the balance maintenance operation of the lithium secondary battery pack in the energy storage shelter.
The invention has the following beneficial effects and advantages:
1. the energy storage square cabin is movable in position, flexible and convenient to use and low in economic cost;
2. the system runs unattended for 24 hours, monitors the state information of the lithium secondary battery pack, and performs early warning on faults in advance, thereby saving manpower and material resources;
3. the system automatically completes the charge-discharge maintenance and the balanced maintenance of the lithium secondary battery pack, thereby reducing potential safety hazards and casualties caused by manual operation errors; the system can be operated remotely, and the problem of region and personnel allocation is solved.
4. The shelter maintenance terminal can monitor and control the shelter environmental conditions, can perform automatic function management on the balance maintenance platform and the charge-discharge maintenance platform, and complete the long-term storage and regular maintenance work of the lithium secondary battery pack under the unattended condition; the remote system management platform can be remotely connected with the shelter maintenance terminal to complete the remote monitoring and control work of the system. Therefore, the storage and maintenance work of the lithium secondary battery pack is finished by the method, potential safety hazards and casualties caused by manual operation errors are reduced, and manpower and material resources are greatly saved.
Drawings
Fig. 1 is a schematic view of an external interface of a battery module according to an embodiment of the invention.
FIG. 2 is a schematic diagram of a system of an embodiment of the present invention.
Figure 3 is a schematic representation of the operation of the method of the present invention.
FIG. 4 is a schematic workflow diagram of the storage mode of the method of the present invention.
FIG. 5 is a schematic view of the operation flow of the charge/discharge maintenance mode of the method of the present invention.
Fig. 6 is a schematic diagram of the operation flow of the equalization maintenance mode of the method of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
A mobile unattended lithium secondary battery pack storage and maintenance method mainly comprises a mobile electrochemical energy storage system shelter and a remote system management platform. The shelter is provided with a power distribution unit, a fire fighting unit, an air conditioning unit, a fresh air unit, a video monitoring unit and a grounding lightning protection unit, so that potential safety hazards of a lithium secondary battery pack placed in the shelter can be avoided, a storage environment with appropriate temperature and humidity and fresh air is provided for the lithium secondary battery pack, and the health state of the lithium secondary battery pack stored for a long time is ensured. The video monitoring unit can record video images during storage and maintenance of the lithium secondary battery pack, and is convenient for shelter remote monitoring and fault positioning work after battery faults occur.
The charging and discharging maintenance platform, the balance maintenance platform and the shelter maintenance terminal are arranged in the shelter. The charging and discharging maintenance platform can provide periodic charging and discharging maintenance conditions for the whole battery pack (high voltage or low voltage), and meets the periodic (3-6 months) full charging and discharging requirements of the battery pack maintenance requirements; the balance maintenance platform can provide the conditions of low current, charging and discharging for the whole lithium secondary battery pack by taking the battery module as a unit. When the lithium secondary battery pack is unbalanced due to long-time use or misoperation, the battery pack and the battery module can be quickly and uniformly maintained to reach the state of consistent electric quantity.
A mobile unattended lithium secondary battery storage and maintenance system comprises three operation modes: the system comprises a storage mode, a charging and discharging maintenance mode and a balance maintenance mode, wherein a shelter maintenance terminal in the three modes interacts with discrete signals and data of a power distribution unit, a fire-fighting unit, an air conditioning unit and a fresh air unit in an energy storage shelter according to the actual working conditions of the system to complete system safety monitoring and environmental condition control. As shown in fig. 3 to 6.
During normal storage of the lithium secondary battery pack, the system is in a storage mode. At this time, the shelter maintenance terminal is timed to power on and power off the battery management system in the lithium secondary battery pack, and reads the state information of the lithium secondary battery pack through communication with the battery management system. Meanwhile, the shelter maintenance terminal keeps continuous communication with the remote system management platform and uploads the environmental information in the system and the information of the lithium secondary battery pack in real time. When the shelter maintenance terminal judges that the storage time length of the lithium secondary battery pack meets the requirement of the charging and discharging maintenance time interval, the system automatically exits the storage mode and enters the charging and discharging maintenance mode.
And after the system enters a charge-discharge maintenance mode, the shelter maintenance terminal controls the battery management system to be powered on and the charge-discharge maintenance power supply to be powered on, reads the state information of the lithium secondary battery pack, and loads and configures a charge-discharge maintenance curve and parameters according to the current state information of the lithium secondary battery pack. And after the charging and discharging maintenance work is finished, the shelter maintenance terminal controls the battery management system and the charging and discharging maintenance power supply to be powered off and automatically enters a storage mode.
And when the lithium secondary battery pack is stored or after the charging and discharging maintenance is finished, the shelter maintenance terminal judges according to the integral level of the voltage of the single body and the pressure difference between the single bodies, and if the problem that the electric quantity of the lithium secondary battery pack is unbalanced is identified, the system automatically enters an equilibrium maintenance mode.
When the system enters the balance maintenance mode, the shelter maintenance terminal firstly controls the balance maintenance platform to be powered on, and determines the number of the balance maintenance instruments in the platform, the number of the on-line battery modules and the state information of the on-line battery modules through data interaction between the shelter maintenance terminal and the balance maintenance platform. And the shelter maintenance terminal configures the balance maintenance parameters according to the information and executes balance maintenance work. And when the balance maintenance work is finished, the shelter maintenance terminal controls the balance maintenance platform to be powered off and automatically enters a storage mode.
A mobile unattended lithium secondary battery storage and maintenance system comprises a remote system management platform of a monitoring center located at a remote end besides a shelter. The remote system management platform completes the remote communication function with at least one shelter maintenance terminal in a wired or wireless communication mode. The remote system management platform is provided with a control interface with all functions of the shelter maintenance terminal, can remotely complete the work of storage monitoring, charging and discharging maintenance, balanced maintenance and the like of the lithium secondary battery pack, and can record data of all the shelter lithium secondary battery pack maintenance and storage periods within a period of time. The working personnel can know the important information and the health state of the lithium secondary battery pack through the remote system management platform and can directly control the charging and discharging maintenance and the balance maintenance operation of the lithium secondary battery pack in the opposite cabin.
Example 1: a power supply of the underwater emergency rescue robot is a lithium secondary battery pack. The battery pack is formed by connecting 96 lithium iron phosphate battery monomers with the capacity of 60Ah and the rated voltage of 3.2V in series, wherein the total voltage range is 260V-345V, and the total capacity is 60 Ah. Because the underwater emergency rescue robot is low in use frequency and is in a storage state for a long time, in the past, workers need to regularly charge and discharge the lithium secondary battery pack in the underwater emergency rescue robot for maintenance, and the method described in the patent is adopted for storing and maintaining the lithium secondary battery pack.
The lithium secondary battery pack is formed by connecting 12 battery modules of 8 strings in series. The battery module is internally provided with a Battery Management System (BMS) which can finish the acquisition of the voltage and the temperature of the single body. Referring to fig. 1, the external interface of the battery module includes a positive electrode of the battery module, a negative electrode of the battery module, a communication power supply interface, and a maintenance interface. The battery modules complete cascade work through the positive electrodes of the battery modules and the negative electrodes of the battery modules; the BMS arranged in the battery module completes power supply of the BMS and external CAN communication through the communication power supply interface; the maintenance interface is connected with the single battery cell through a wire inside the battery module, and the current carrying capacity of the wire is 5A, so that the maintenance work of the single battery inside the battery module is completed.
The electrochemical energy storage system square cabin used in the embodiment is produced according to T/CEC 175-. 8 sets of lithium secondary battery packs of the underwater emergency rescue robot are stored in the square cabin and fixed through a mechanical support.
As shown in fig. 2, the shelter, besides the main structure, comprises a power distribution unit, a fire-fighting unit, an air conditioning unit, a fresh air unit, a video monitoring unit and a grounding lightning protection unit, and can provide a movable safe and suitable environment for long-term storage of the lithium secondary battery pack. The power distribution unit mainly comprises an integrated power distribution cabinet, the input of the power distribution unit has undervoltage, overvoltage, overcurrent, electric leakage and lightning protection, the output of the power distribution unit has overcurrent and electric leakage protection, and all input and output channels are provided with current and voltage monitoring modules. The fire-fighting unit consists of a 40L heptafluoropropane automatic fire extinguishing device, and the device consists of a standby battery, a fire-fighting controller, a smoke sensor, a temperature sensor, an audible and visual alarm, 35Kg of fire-fighting agent, a fire-fighting steel cylinder, a pressure release valve and the like. The air conditioning unit consists of a 3.5kW industrial air conditioner, and the air conditioner has the functions of refrigeration, heating and dehumidification. The new trend unit comprises new fan and exhaust fan, and the fan is equipped with air filter, can accomplish the take a breath and the air purification function in the shelter. The video monitoring unit comprises a camera and a hard disk video recorder of Haikangwei video, 2 cameras are arranged in each shelter and distributed on the oblique opposite angles at the top, and the hard disk video recorder is located in a remote monitoring center and completes image recording through remote data connection. The grounding lightning protection unit adopts a shelter integral grounding mode, and finally the shelter grounding resistance is less than 2 omega.
A balance maintenance platform, a charge-discharge maintenance platform and a shelter maintenance terminal are arranged in the shelter.
The balance maintenance platform consists of 12 balance maintenance instruments, and the balance maintenance instruments are uniformly controlled by the shelter maintenance terminal through CAN communication. The single balance maintenance instrument comprises 8 independent balance maintenance channels, and each channel can be used for charging and discharging maintenance of 2.5A current. When the lithium secondary battery pack is in balanced maintenance, the battery modules correspond to the balanced maintenance instrument one to one and are connected through the maintenance wiring harness.
The charge and discharge maintenance platform consists of 8 charge and discharge maintenance power supplies, each charge and discharge maintenance power supply comprises a group of charge and discharge maintenance interfaces, and the charge and discharge maintenance interfaces are uniformly controlled by the shelter maintenance terminal through CAN communication. The voltage range of the charging and discharging maintenance power supply is 192V-355V, the current range is 0A-12A, and the charging and discharging maintenance work of the lithium secondary battery pack of 0.2C or below can be completed.
The shelter maintenance terminal is maintenance software configured for a single set of shelter, and completes the shelter number identification function by configuring the ID of the shelter maintenance terminal. The shelter maintenance terminal is communicated with the fire-fighting unit, the air-conditioning unit, the fresh air unit and the power distribution unit to complete the monitoring and control of the shelter environmental conditions; the shelter maintenance terminal is communicated with a BMS (battery management system) arranged in the lithium secondary battery pack to read state information of the lithium secondary battery pack, such as single cell voltage, single cell temperature, total voltage, total current, SOC (system on chip) and the like; the shelter maintenance terminal automatically performs the balance maintenance and the regular charging and discharging maintenance work of the lithium secondary battery pack through the communication control function of the balance maintenance platform and the charging and discharging maintenance platform, and realizes the long-term storage and the regular maintenance function of the lithium secondary battery pack under the unattended condition.
The remote system management platform is located in a remote monitoring center and realizes remote communication with the shelter maintenance terminal in a wireless network bridge communication mode. The remote system management platform has all functions of a shelter maintenance terminal, and can remotely complete the work of storage monitoring, charging and discharging maintenance, balanced maintenance and the like of the lithium secondary battery pack. In addition, data of the maintenance and storage periods of all the lithium secondary battery packs in the cabins in six months and video image data of all the cabins in three months can be recorded. The remote system management platform is also provided with a 4G remote monitoring website, and the real-time state of the lithium secondary battery pack can be monitored anytime and anywhere through a login server.
Introduction of working state:
(1) storage state
And during the storage period of the lithium secondary battery pack, the shelter maintenance terminal operates for 24 hours, the BMS in the lithium secondary battery pack is controlled to be electrified every half hour, the current state of the lithium secondary battery pack is read through communication, and the current state is recorded and uploaded to a remote system management platform. During the storage period, the power distribution unit, the fire fighting unit and the video monitoring unit in the shelter run automatically, and the shelter maintenance terminal monitors the state information of the power distribution unit and the fire fighting unit, records and uploads the state information to the remote system management platform. The shelter maintenance terminal completes automatic control of environmental conditions in the shelter by controlling the running states and running parameters of the air conditioning unit and the fresh air unit.
(2) Charge and discharge maintenance state
During the storage period of the lithium secondary battery pack, charge and discharge maintenance operations were performed every 6 months. During the charging and discharging maintenance operation, the shelter maintenance terminal controls the BMS inside the 8 lithium secondary battery packs and the charging and discharging maintenance platform to be powered on, and the lithium secondary battery packs and the charging and discharging maintenance power supply are automatically controlled through communication to complete the charging and discharging maintenance work. The charging and discharging maintenance work steps are divided into three steps: full charge- > discharge of electric quantity- > charge to 60%.
During charge and discharge maintenance, the power distribution unit, the fire fighting unit and the video monitoring unit in the shelter run automatically, and the shelter maintenance terminal monitors state information of the power distribution unit and the fire fighting unit, records and uploads the state information to the remote system management platform. And the shelter maintenance terminal controls the running states and running parameters of the air conditioning unit and the fresh air unit according to the heat productivity during the charge and discharge maintenance period, so as to complete the automatic control of the environmental conditions in the shelter.
And after the charging and discharging maintenance work is finished, the shelter maintenance terminal is automatically converted into a storage state.
(3) Equalizing maintenance states
Because the internal resistance and the self-discharge rate of the lithium secondary battery pack are different, the lithium secondary battery pack has the possibility of generating the problem of inconsistent electric quantity of the battery pack after long-term use or storage. If only the single battery modules are balanced, the electric quantity between the battery module and other battery modules is inconsistent, and therefore the whole lithium secondary battery pack needs to be uniformly balanced and maintained. The balance maintenance operation needs to manually connect the balance maintenance instrument of the balance maintenance platform with the battery modules in the unbalanced lithium secondary battery pack in a one-to-one correspondence manner through balance wiring harnesses. After the connection is finished, the shelter maintenance terminal enters a balance maintenance state through controlling the balance maintenance platform and automatically finishes the balance maintenance work.
During the balanced maintenance, the power distribution unit, the fire fighting unit and the video monitoring unit in the shelter run automatically, and the shelter maintenance terminal monitors the state information of the power distribution unit and the fire fighting unit, records and uploads the state information to the remote system management platform. And the shelter maintenance terminal controls the running states and running parameters of the air conditioning unit and the fresh air unit according to the heat productivity during the balanced maintenance, and finishes the automatic control of the environmental conditions in the shelter.
And after the balance maintenance work is finished, the balance wiring harness shelter maintenance terminal is disconnected and automatically switched to a storage state.
The foregoing is a preferred embodiment of the present invention, and it should be understood that without departing from the principle of the present invention, it is within the scope of the present invention to change the number and form of the shelter, or to change the manual operation part of each platform into software automatic control, or to add other functional units in the shelter, or to remove the balance maintenance platform.
Claims (8)
1. A mobile unattended lithium secondary battery pack storage and maintenance system is characterized by comprising an energy storage square cabin, a square cabin maintenance terminal, a balance maintenance platform and a charging and discharging maintenance platform, wherein the square cabin maintenance terminal, the balance maintenance platform and the charging and discharging maintenance platform are arranged in the energy storage square cabin;
the balance maintenance platform is used for carrying out electric quantity balance control on the lithium secondary battery pack;
the charging and discharging maintenance platform is used for controlling charging and discharging of the lithium secondary battery pack;
the shelter maintenance terminal is used for communicating with a battery management system of the lithium secondary battery pack, reading state information in the battery pack and finishing storage monitoring of the lithium secondary battery pack; and the balance maintenance and the charge and discharge maintenance management are realized through data interaction with the balance maintenance platform and the charge and discharge maintenance platform respectively.
2. The system of claim 1, wherein a shelter-mating unit comprising a power distribution unit, a fire protection unit, an air conditioning unit, a fresh air unit, a video monitoring unit, and a grounding lightning protection unit is disposed in the energy storage shelter.
3. The mobile unattended lithium secondary battery storage and maintenance system according to claim 1, wherein the equalization maintenance platform comprises: the device comprises a control unit and M battery module balance maintenance instruments connected with the control unit, wherein M is more than or equal to the number of single battery modules in a battery cluster;
and the balance control unit is used for controlling the balance maintenance work of the lithium secondary battery pack as a whole or less than M battery modules according to the balance maintenance parameters and the start-stop command of the shelter maintenance terminal.
4. The system of claim 1, wherein the charge/discharge maintenance platform comprises a charge/discharge control unit and a charge/discharge maintenance power supply connected thereto, and is configured to perform charge/discharge maintenance on the entire lithium secondary battery within a predetermined current range according to charge/discharge maintenance parameters and start/stop commands of the shelter maintenance terminal; wherein, discharge adopts the feedback electric wire netting mode to reduce the heat accumulation in the shelter.
5. The system of claim 1, further comprising a remote system management platform for remotely connecting at least one shelter maintenance terminal in a wired or wireless communication manner for monitoring and controlling to complete the integration and analysis of the lithium secondary battery pack data.
6. A mobile unattended lithium secondary battery pack storage and maintenance method is characterized in that under three modes of a storage mode, a charging and discharging maintenance mode and a balance maintenance mode, a shelter maintenance terminal completes system safety monitoring and environmental condition control through discrete signal and data interaction with a power distribution unit, a fire-fighting unit, an air conditioning unit and a fresh air unit in an energy storage shelter according to the actual working conditions of the system.
7. The mobile unattended storage and maintenance method of a lithium secondary battery pack according to claim 6, comprising the steps of:
during storage of the lithium secondary battery, the system is in storage mode: the shelter maintenance terminal is used for powering on and powering off a battery management system in the lithium secondary battery pack at regular time, and reading the state information of the lithium secondary battery pack through communication with the battery management system; meanwhile, the shelter maintenance terminal keeps continuous communication with the remote system management platform, and uploads environmental information and lithium secondary battery pack state information acquired by a shelter matching unit in the system in real time; when the shelter maintenance terminal judges that the storage time length of the lithium secondary battery pack meets the requirement of the charging and discharging maintenance time interval, the system automatically exits the storage mode and enters the charging and discharging maintenance mode;
when the system enters a charge-discharge maintenance mode, the shelter maintenance terminal controls the battery management system to be powered on and the charge-discharge maintenance platform to be powered on, reads the state information of the lithium secondary battery pack, loads and configures a charge-discharge maintenance curve according to the state information of the current lithium secondary battery pack, and controls the charge-discharge maintenance platform to execute; after the charging and discharging maintenance work is finished, the shelter maintenance terminal controls the battery management system and the charging and discharging maintenance power supply to be powered off and automatically enters a storage mode;
during the storage period or the charging and discharging maintenance period of the lithium secondary battery pack, the shelter maintenance terminal sets a threshold value according to the voltage of the monomers in the lithium secondary battery pack, and compares the maximum pressure difference between the monomers with the set threshold value; when the maximum pressure difference between the single batteries is larger than a threshold value, the lithium secondary battery pack has the problem of unbalanced electric quantity, and the system automatically enters a balance maintenance mode;
after the system enters a balance maintenance mode, the shelter maintenance terminal firstly controls the balance maintenance platform to be powered on, and determines the number of balance maintenance instruments in the platform, the number of on-line battery modules and the state information of the on-line battery modules through data interaction with the balance maintenance platform;
the shelter maintenance terminal configures the balance maintenance parameters according to the information and executes balance maintenance work; and when the balance maintenance work is finished, the shelter maintenance terminal controls the balance maintenance platform to be powered off and automatically enters a storage mode.
8. The mobile unattended storage and maintenance method of the lithium secondary battery pack according to claim 6, wherein the remote system management platform performs remote communication with at least one shelter maintenance terminal in a wired or wireless communication manner; remotely completing the work of storage monitoring, charging and discharging maintenance and balanced maintenance of the lithium secondary battery pack, and recording the data of the lithium secondary battery pack in all energy storage cabins in a period of time during maintenance and storage; and monitoring the state information of the lithium secondary battery pack through a remote system management platform, and directly controlling the charging and discharging maintenance and the balance maintenance operation of the lithium secondary battery pack in the energy storage shelter.
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