CN116759664B - Online capacity checking device and method for storage battery pack - Google Patents
Online capacity checking device and method for storage battery pack Download PDFInfo
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- CN116759664B CN116759664B CN202310663045.6A CN202310663045A CN116759664B CN 116759664 B CN116759664 B CN 116759664B CN 202310663045 A CN202310663045 A CN 202310663045A CN 116759664 B CN116759664 B CN 116759664B
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000007599 discharging Methods 0.000 claims description 42
- 238000012544 monitoring process Methods 0.000 claims description 39
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 35
- 230000005856 abnormality Effects 0.000 claims description 3
- 238000012795 verification Methods 0.000 claims description 2
- 239000004594 Masterbatch (MB) Substances 0.000 claims 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
Classifications
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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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
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
-
- 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
- H01M10/4285—Testing apparatus
-
- 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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
-
- 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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- 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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
-
- 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
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to the technical field of online detection of capacity of storage batteries, in particular to an online capacity checking device and method of a storage battery, which are applied to a direct-current charging system. Compared with the traditional method, the method has better safety, convenience and reliability and lower hardware cost, and according to the method, operation and maintenance personnel of the transformer substation can conveniently and regularly perform online capacity checking and timely find the fault hidden trouble of the storage battery pack to be tested, so that serious power grid accidents are avoided, powerful guarantee is provided for safe operation of the power grid, and good social benefit and economic benefit are achieved.
Description
Technical Field
The invention relates to the technical field of online detection of capacity of a storage battery pack, in particular to an online capacity checking device and method of the storage battery pack.
Background
The direct current power supply system is an important component of a power plant and a transformer substation, provides working voltage for direct current electric equipment in the power plant and the transformer substation, and the storage battery pack serving as a backup power supply of the direct current power supply system is one of the most core components of the direct current power supply system, so that the judgment of the quality of the storage battery is very important.
The traditional storage battery pack nuclear capacity needs to be connected with a group of standby storage batteries into a direct current system, then the storage battery pack to be tested is withdrawn, a charge and discharge test is manually carried out, and the whole test process is accompanied by repeated storage battery pack connection and withdrawal operations and a certain operation risk.
The patent publication number is: the patent document CN112763924a discloses an online capacity checking device and method for a storage battery pack, which comprises the storage battery pack, and a first fuse and a second fuse connected with positive and negative output ends of the storage battery pack, wherein a standby battery is not required to replace an operating battery during capacity checking, so that the cost of purchasing and maintaining the standby battery is saved, the preparation work required before the capacity checking test is reduced, and the working efficiency is improved.
In combination with the above-mentioned technical scheme, the current on-line nuclear capacity field, the method mainly reflects in the battery discharge test link, one is to connect a pure resistor in series as dummy load R for the storage battery to provide the discharge channel, most adopt and disconnect the charger to the middle charging channel of the storage battery in the discharge test, but adopt this kind of method nuclear capacity can produce a large amount of problems that generate heat in the discharge process, in long-time discharge, the sustained heating can bring certain potential safety hazard, if adopt the resistance of big resistance to reduce heating, then the storage battery discharge current can not be ensured, the discharge test time will greatly increase, another is to connect the storage battery into the inverter device, make it invert to the alternating current system supply and accomplish discharging, but this method structure is comparatively more complicated, and the inverter brings the hardware cost relatively higher, therefore, a more energy-saving and environment-friendly, the security is higher, the nuclear capacity cost is also correspondingly lower scheme is also needed in order to solve the above-mentioned problems.
Disclosure of Invention
In order to overcome the technical problems, the invention aims to provide an online capacity checking device and method for a storage battery pack, which solve the problems of potential safety hazard, longer capacity checking time and higher capacity checking cost in the online capacity checking process of the current storage battery pack.
The aim of the invention can be achieved by the following technical scheme:
the utility model provides a storage battery pack is to hold device on line, is applied to direct current charging system, including direct current charging machine, the storage battery pack that awaits measuring, step down silicon chain, close female and accuse female, be provided with charging contactor and diode in series between direct current charging machine and the storage battery pack that awaits measuring, charging contactor with connect in parallel between the diode, be provided with the discharge contactor in series between storage battery pack that awaits measuring and the accuse female, during normal operating the output of direct current charging machine is through close female, step down silicon chain is transmitted to in proper order accuse female, at this moment the charging contactor with the mode of floating charge with the storage battery pack that awaits measuring is connected;
the device also comprises an intermediate relay, wherein a signal input contact of the intermediate relay is connected to the control monitoring unit, a movable contact of the intermediate relay is connected to a coil contact of the discharging contactor, and a movable breaking contact of the intermediate relay is connected to a control unit of the step-down silicon chain.
The charging contactor is characterized in that an input main contact of the charging contactor is connected to an output end of the direct-current charger, an output main contact of the charging contactor is connected to the storage battery pack to be tested, and a coil contact of the charging contactor is connected with a normally closed auxiliary contact of the discharging contactor.
The input main contact of the discharging contactor is connected to the storage battery pack to be tested, the output main contact of the discharging contactor is connected to the control master, the coil contact of the discharging contactor is connected to the moving contact of the intermediate relay, and the normally closed auxiliary contact of the discharging contactor is connected to the coil contact of the charging contactor.
The positive electrode of the diode is connected to the storage battery pack to be tested, and the negative electrode of the diode is connected to the output end of the direct current charger.
Further characterized in that the control and monitoring unit comprises the following modules:
the operation control module is used for starting and stopping the online capacity checking process of the storage battery pack to be tested;
the parameter setting module is used for setting parameters of the charge and discharge constant value of the online nuclear capacity;
and the alarm module is used for alarming when detecting the abnormality of the device and the storage battery pack to be tested.
The on-line capacity checking method of the storage battery pack is applied to an on-line capacity checking device, the on-line capacity checking device comprises a direct-current charger, a storage battery pack to be tested, a voltage-reducing silicon chain, a combining bus and a control bus, a charging contactor and a diode are connected in series between the direct-current charger and the storage battery pack to be tested, the charging contactor and the diode are connected in parallel, a discharging contactor is connected in series between the storage battery pack to be tested and the control bus, and during normal operation, the output of the direct-current charger is sequentially transmitted to the control bus through the combining bus and the voltage-reducing silicon chain, and at the moment, the charging contactor is connected with the storage battery pack to be tested in a floating charging mode;
the on-line nuclear capacity device also comprises an intermediate relay, a signal input contact of the intermediate relay is connected to the control monitoring unit, a movable contact of the intermediate relay is connected to a coil contact of the discharge contactor, and a movable break contact of the intermediate relay is connected to a control unit of the step-down silicon chain.
Further, in a normal working condition, the direct current charger outputs to the combining mother, the combining mother outputs to the control mother through the step-down silicon chain, at the moment, the charging contactor is closed, floating charging is carried out on the storage battery to be tested, the discharging contactor is opened, and the gear of the step-down silicon chain is unchanged;
when the online nuclear capacity is carried out, the control monitoring unit sends out an electrifying signal, after the coil of the intermediate relay is electrified, the normally closed auxiliary contact of the intermediate relay is opened to enable the gear of the step-down silicon chain to be adjusted to be the maximum, the normally open auxiliary contact of the intermediate relay is closed to enable the coil of the discharge contactor to be electrified, the discharge contactor is closed, a discharge channel between the storage battery pack to be tested and the control bus is opened, meanwhile, the normally closed auxiliary contact of the storage battery pack to be tested is opened, at the moment, the coil of the charging contactor is powered off, and the channel from the direct-current charger to be output to the storage battery pack to be tested is opened;
after the online capacity checking is finished, setting a discharging reset condition and a uniform charging reset condition of the online capacity checking device, when the discharging reset condition is reached, sending a power-off signal by the control monitoring unit, wherein a coil of the intermediate relay is powered off, a normally closed auxiliary contact is closed to reset the gear of the step-down silicon chain to a normal working condition state, a normally open auxiliary contact is opened to enable the coil of the discharging contactor to be powered off, a discharging contactor is opened, a discharging channel between the storage battery to be tested and the control bus is opened, meanwhile, a normally closed auxiliary contact of the storage battery to be tested is closed, a coil of the charging contactor is powered on, a channel output to the storage battery to be tested is opened, uniform charging verification is carried out on the storage battery to be tested, after the uniform charging reset condition is reached, the storage battery to be tested is converted into a floating charging state, and the online capacity checking device is restored to the normal working condition running state at the moment.
Further, in the condition of discharge reset, any one of the online capacity checking devices in A or B can be automatically reset:
A. when the discharge coefficient is 0.1, the voltage value is smaller than the numerical value set by the control monitoring unit;
B. when the discharge coefficient is 3, the discharge time is equal to the value set by the control monitoring unit.
The online capacity checking method of the storage battery pack according to claim 7, further comprising the step of automatically resetting the online capacity checking device meeting any one of C or F under the condition of uniform charging resetting:
when the charging coefficient is 0.1, the voltage value is larger than the numerical value set by the control monitoring unit;
when the charging coefficient is 0.01, the current value is smaller than the value set by the control monitoring unit, and when the charging coefficient is 3, the delay is equal to the value set by the control monitoring unit;
when the charging coefficient is 0.01, the current value is larger than the value set by the control monitoring unit, and when the charging coefficient is 3, the delay is equal to the value set by the control monitoring unit;
and when the charging coefficient is 0.05, the uniform charging time is equal to the numerical value set by the control monitoring unit.
Further, when the control master is further configured with a chopper device to ensure that the voltage of the control master is maintained at 220V, the chopper device needs to be turned off to ensure that the on-line nuclear capacity is normally performed when the on-line nuclear capacity is performed.
The invention has the beneficial effects that:
according to the technical scheme, the on-line capacity of the storage battery to be tested under the direct-current charging system in the form of direct-current charger-combined bus-voltage reduction silicon chain-control bus is realized, the on-line capacity of the storage battery to be tested can be realized through controlling the intermediate relay, the discharging contactor, the charging contactor and the gear of the voltage reduction silicon chain, in the capacity process, if the system fails and the alternating current input is lost or the direct-current charger fails and has no output, the storage battery to be tested can still continue to supply power for the combined bus through the diode, and the direct-current system is ensured to be powered off.
Drawings
The invention is further described below with reference to the accompanying drawings.
Fig. 1 is a schematic circuit diagram of a battery pack nuclear capacity device to be tested in a conventional method;
FIG. 2 is a schematic circuit diagram of a battery pack core-capacitor device to be tested according to the present invention;
FIG. 3 is a structural frame diagram of a control and monitoring unit in the present invention;
fig. 4 is a logic diagram of the operation of the intermediate relay in the present invention.
In the figure: 1. a direct current charger; 2. a direct current load; 3. a storage battery pack to be tested; 4. a standby storage battery pack; 5. a step-down silicon chain; 6. a charging contactor; 7. a discharge contactor; 8. a diode; 9. an intermediate relay; 10. and controlling the monitoring unit.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 2, 3 and 4, the on-line capacity checking device of the storage battery pack is applied to a direct current charging system and comprises a direct current charger 1, a storage battery pack 3 to be tested, a step-down silicon chain 5, a combining mother and a control mother, wherein the combining mother is shown as +hm in the figure, and the control mother is shown as +km in the figure.
Under normal working conditions, the direct current charging system applied by the scheme converts alternating current input into direct current output of 240V, and the direct current output is supplied to a closing bus, namely a closing bus, and the closing bus is subjected to voltage reduction output of 220V through a voltage reduction silicon chain 5, namely a control bus, and meanwhile, a storage battery pack 3 to be tested is mounted on the closing bus and is in a floating charging state, and when the direct current charging system 1 fails and cannot perform direct current output, the storage battery pack 3 to be tested is used as a standby power supply to be output to the closing bus, and power is supplied to the control bus through the voltage reduction silicon chain 5.
As shown in fig. 1, in the conventional capacity checking process, a set of standby battery packs 4 needs to be prepared first and connected to a dc charging system in parallel, then fuses and signal fuses at two ends of the battery pack 3 to be tested are taken down, the battery pack 3 to be tested is separated from the dc charger 1 and the dc load 2, and the capacity checking is performed by using an external load.
The on-line nuclear capacity device is characterized in that a charging contactor 6 and a diode 8 are arranged in series between a direct-current charger 1 and a storage battery pack 3 to be tested, the charging contactor 6 and the diode 8 are connected in parallel, a discharging contactor 7 is arranged in series between the storage battery pack 3 to be tested and a control bus, the on-line nuclear capacity device further comprises an intermediate relay 9, a signal input contact of the intermediate relay 9 is connected to a control monitoring unit 10, a moving contact of the intermediate relay is connected to a coil contact of the discharging contactor 7, and a moving break contact of the intermediate relay is connected to a control unit of a step-down silicon chain 5.
The control monitoring unit 10 in this embodiment includes the following modules: the operation control module is used for starting and stopping the online capacity checking process of the storage battery pack 3 to be tested;
the parameter setting module is used for setting parameters of the charge and discharge constant value of the online nuclear capacity;
and the alarm module is used for alarming when the abnormality of the device and the storage battery pack 3 to be tested is detected.
In this embodiment, the input main contact of the charging contactor 6 is connected to the output end of the dc charger 1, the output main contact thereof is connected to the battery pack 3 to be tested, and the coil contact thereof is connected to the normally closed auxiliary contact of the discharging contactor 7.
In this embodiment, the input main contact of the discharging contactor 7 is connected to the battery pack 3 to be tested, the output main contact thereof is connected to the control master, the coil contact thereof is connected to the moving contact of the intermediate relay 9, and the normally closed auxiliary contact thereof is connected to the coil contact of the charging contactor 6.
In this embodiment, the anode of the diode 8 is connected to the battery pack 3 to be tested, and the cathode thereof is connected to the output terminal of the dc charger 1.
When the online capacity checking device is used, a storage battery pack online capacity checking method is needed, and online capacity checking is carried out on the storage battery pack 3 to be tested according to the method;
when the online nuclear capacity device is in a normal working condition:
the direct current charger 1 outputs to a combining mother, the combining mother outputs to a control mother through the step-down silicon chain 5, at the moment, the charging contactor 6 is closed, floating charging is carried out on the storage battery 3 to be tested, the discharging contactor 7 is opened, and the gear of the step-down silicon chain 5 is kept unchanged normally;
when online nuclear capacity is carried out:
after the coil of the intermediate relay 9 is electrified, the normally closed auxiliary contact of the intermediate relay 9 is opened to enable the gear of the buck silicon chain 5 to be adjusted to the maximum, the normally open auxiliary contact of the intermediate relay 9 is closed to enable the coil of the discharging contactor 7 to be electrified, the discharging contactor 7 is closed, a discharging channel between the storage battery pack 3 to be tested and the control bus is opened, meanwhile, the normally closed auxiliary contact of the storage battery pack 3 to be tested is opened, the coil of the charging contactor 6 is powered off at the moment, the channel of the direct current charger 1 output to the storage battery pack 3 to be tested is disconnected, 35V buck is generated between the switching bus and the control bus due to the fact that the buck silicon chain 5 works at the maximum gear, the voltage of the switching bus to the control bus after the buck silicon chain 5 is stepped down is 205V, the voltage lower than the voltage 240V output to the control bus of the storage battery pack 3 to be tested, and the load on the control bus is discharged by the storage battery pack 3 to be tested at the moment;
according to the single-phase conductivity of the diode 8, in the process of carrying out the nuclear capacity of the storage battery pack 3 to be tested, although the voltage of the combined bus is higher than the voltage of the storage battery pack 3 to be tested, the combined bus cannot charge the storage battery pack 3 to be tested, and when the direct current charger 1 fails and loses power, the storage battery pack 3 to be tested can continue to supply power for the combined bus through the diode 8, so that the safety and stability of the operation of the direct current charging system when the storage battery pack 3 to be tested is in the nuclear capacity are ensured.
After the online nuclear capacity is completed:
setting a discharging reset condition and a uniform charging reset condition of the online capacity checking device, when the discharging reset condition is reached, controlling the monitoring unit 10 to send a power-off signal, enabling a coil of the intermediate relay 9 to lose electricity, closing a normally closed auxiliary contact of the intermediate relay to reset a gear of the buck silicon chain 5 to a normal working condition state, opening a normally open auxiliary contact of the intermediate relay to enable the coil of the discharging contactor 7 to lose electricity, opening a discharging channel between the storage battery 3 to be tested and a control bus, closing the normally closed auxiliary contact of the storage battery 3 to be tested, enabling a coil of the charging contactor 6 to obtain electricity, opening a channel of the direct current charger 1 output to the storage battery 3 to be tested, performing uniform charging check on the storage battery 3 to be tested, and converting the storage battery 3 to be tested into a floating charging state after the uniform charging reset condition is reached, wherein the online capacity checking device is restored to the normal working condition running state.
As shown in table 1, in the discharge resetting condition, any one of the online capacity checking devices satisfying a or B can be automatically reset:
A. when the discharge coefficient is 0.1, the voltage value is smaller than the value set by the control monitoring unit 10;
B. when the discharge coefficient is 3, the discharge time is equal to the value set by the control monitoring unit 10.
TABLE 1
As shown in table 2, in the condition of homogeneous charge reset, any one of C or F can be automatically reset by the online check-capacity device:
when the charging coefficient is 0.1, the voltage value is larger than the value set by the control monitoring unit 10;
when the charging coefficient is 0.01, the current value is smaller than the value set by the control monitoring unit 10, and when the charging coefficient is 3, the delay is equal to the value set by the control monitoring unit 10;
when the charging coefficient is 0.01, the current value is larger than the value set by the control monitoring unit 10, and when the charging coefficient is 3, the delay is equal to the value set by the control monitoring unit 10;
when the charging coefficient is 0.05, the charging time is equal to the value set by the control monitoring unit 10.
TABLE 2
In other contemplated embodiments, when the control bus is further configured with a chopper device to ensure that the voltage of the control bus is maintained at 220V, the chopper device needs to be turned off when the online capacity is performed, so that a sufficient potential difference exists between the control bus and the battery pack 3 to be tested to ensure that the online capacity is performed normally.
According to the scheme, through controlling the intermediate relay 9, the discharging contactor 7, the charging contactor 6 and the gear of the step-down silicon chain 5, the online capacity of the storage battery pack 3 to be tested under the direct-current charging system in a mode of combining the master and the step-down silicon chain 5-control is realized, in the capacity checking process, if the system fails and loses alternating-current input or the direct-current charging machine 1 fails and does not output, the storage battery pack 3 to be tested can still continuously supply power for the combining master through the diode 8, and the direct-current system is ensured to be powered off, compared with the traditional method, the method abandons the mode of offline capacity checking of the storage battery pack 3 to be tested in the past, reduces labor cost, time cost and material cost, avoids operation risks brought in the process of switching in and switching out of the storage battery pack in and out of the traditional mode, realizes a more concise, efficient and safe storage battery capacity checking mode, has better safety, convenience and reliability and lower hardware cost; according to the invention, substation operation and maintenance personnel can conveniently and regularly perform online capacity checking, and can timely find the fault hidden trouble of the storage battery pack 3 to be tested, thereby avoiding major grid accidents, providing powerful guarantee for the safe operation of the power grid, and having good social benefit and economic benefit.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative and explanatory of the invention, as various modifications and additions may be made to the particular embodiments described, or in a similar manner, by those skilled in the art, without departing from the scope of the invention or exceeding the scope of the invention as defined in the claims.
Claims (5)
1. The utility model provides a storage battery pack online nuclear capacity device, is applied to direct current charging system, including direct current charging machine (1), await measuring storage battery pack (3), step down silicon chain (5), close female and accuse female, characterized by, be provided with between direct current charging machine (1) and await measuring storage battery pack (3) in series and charge contactor (6) and diode (8), connect in parallel between charging contactor (6) and diode (8), be provided with in series between await measuring storage battery pack (3) and accuse female discharge contactor (7), during normal operation the output of direct current charging machine (1) is through close female, step down silicon chain (5) are transmitted to accuse female in proper order, at this moment charge contactor (6) with the mode of floating charge with await measuring storage battery pack (3);
the device also comprises an intermediate relay (9), wherein a signal input contact of the intermediate relay (9) is connected to a control monitoring unit (10), a moving contact of the intermediate relay is connected to a coil contact of the discharging contactor (7), and a moving break contact of the intermediate relay is connected to a control unit of the step-down silicon chain (5);
the input main contact of the charging contactor (6) is connected to the output end of the direct current charger (1), the output main contact of the charging contactor is connected to the storage battery pack (3) to be tested, and the coil contact of the charging contactor is connected with the normally closed auxiliary contact of the discharging contactor (7);
an input main contact of the discharging contactor (7) is connected to the storage battery pack (3) to be tested, an output main contact of the discharging contactor is connected to the control master, a coil contact of the discharging contactor is connected to a moving contact of the intermediate relay (9), and a normally closed auxiliary contact of the discharging contactor is connected to a coil contact of the charging contactor (6);
the anode of the diode (8) is connected to the storage battery pack (3) to be tested, and the cathode of the diode is connected to the output end of the direct current charger (1);
the control monitoring unit (10) comprises the following modules:
the operation control module is used for starting and stopping the online capacity checking process of the storage battery pack (3) to be tested;
the parameter setting module is used for setting parameters of the charge and discharge constant value of the online nuclear capacity;
and the alarm module is used for alarming when detecting the abnormality of the device and the storage battery pack (3) to be tested.
2. The on-line capacity checking method of the storage battery pack is characterized by being applied to an on-line capacity checking device, wherein the on-line capacity checking device comprises a direct-current charger (1), a storage battery pack (3) to be tested, a voltage-reducing silicon chain (5), a combining bus and a control bus, a charging contactor (6) and a diode (8) are connected in series between the direct-current charger (1) and the storage battery pack (3) to be tested, the charging contactor (6) is connected in parallel with the diode (8), a discharging contactor (7) is connected in series between the storage battery pack (3) to be tested and the control bus, and during normal operation, the output of the direct-current charger (1) is sequentially transmitted to the control bus through the combining bus and the voltage-reducing silicon chain (5), and at the moment, the charging contactor (6) is connected with the storage battery pack (3) to be tested in a floating charging mode;
the on-line nuclear capacity device also comprises an intermediate relay (9), wherein a signal input contact of the intermediate relay (9) is connected to a control monitoring unit (10), a movable contact of the intermediate relay is connected to a coil contact of the discharging contactor (7), and a movable breaking contact of the intermediate relay is connected to a control unit of the step-down silicon chain (5);
during normal working conditions, the direct current charger (1) outputs to the master batch, the master batch outputs to the control master batch through the step-down silicon chain (5), at the moment, the charging contactor (6) is closed, floating charging is carried out on the storage battery pack (3) to be tested, the discharging contactor (7) is disconnected, and the gear of the step-down silicon chain (5) is unchanged;
when the online nuclear capacity is carried out, the control monitoring unit (10) sends an electrifying signal, after the coil of the intermediate relay (9) is electrified, a normally closed auxiliary contact of the intermediate relay is opened to enable the gear of the buck silicon chain (5) to be increased to the maximum, a normally open auxiliary contact of the intermediate relay (9) is closed to enable the coil of the discharge contactor (7) to be electrified, the discharge contactor (7) is closed, a discharge channel between the storage battery pack (3) to be tested and the control bus is opened, meanwhile, the normally closed auxiliary contact of the storage battery pack (3) to be tested is opened, at the moment, the coil of the charging contactor (6) is powered off, and a channel outputted to the storage battery pack (3) to be tested by the direct current charger (1) is disconnected;
after the online capacity checking is finished, setting a discharging reset condition and a uniform charging reset condition of the online capacity checking device, when the discharging reset condition is achieved, the control monitoring unit (10) sends a power-off signal, a coil of the intermediate relay (9) is powered off, a normally closed auxiliary contact of the intermediate relay is closed to enable a gear of the step-down silicon chain (5) to reset to a normal working condition state, a normally open auxiliary contact of the intermediate relay is opened to enable the coil of the discharging contactor (7) to be powered off, the discharging contactor (7) is opened, a discharging channel between the storage battery pack (3) to be tested and the control bus is disconnected, meanwhile, the normally closed auxiliary contact of the storage battery pack (3) to be tested is closed, a coil of the charging contactor (6) is powered on, a channel of the direct-current charger (1) is output to the storage battery pack (3) to be tested is opened, uniform charging verification is carried out on the storage battery pack (3) to be tested, and after the uniform charging reset condition is achieved, the storage battery pack (3) to be tested is converted into a floating charging state, and the online capacity checking device is restored to the normal working condition.
3. The online capacity checking method of the storage battery pack according to claim 2, wherein in the condition of discharge resetting, any one of the online capacity checking devices satisfying a or B can automatically reset:
A. when the discharge coefficient is 0.1, the voltage value is smaller than the value set by the control monitoring unit (10);
B. when the discharge coefficient is 3, the discharge time is equal to the value set by the control monitoring unit (10).
4. The online capacity checking method of the storage battery pack according to claim 2, wherein in the condition of all charging and resetting, any one of the online capacity checking devices meeting the condition of C or F can automatically reset:
when the charging coefficient is 0.1, the voltage value is larger than the value set by the control monitoring unit (10);
when the charging coefficient is 0.01, the current value is smaller than the value set by the control monitoring unit (10), and when the charging coefficient is 3, the delay is equal to the value set by the control monitoring unit (10);
when the charging coefficient is 0.01, the current value is larger than the value set by the control monitoring unit (10), and when the charging coefficient is 3, the delay is equal to the value set by the control monitoring unit (10);
when the charging coefficient is 0.05, the homogeneous charging time is equal to the value set by the control monitoring unit (10).
5. The method for online capacity checking of a storage battery pack according to claim 2, wherein when the control master is further configured with a chopper device to ensure that the voltage of the control master is maintained at 220V, the chopper device needs to be turned off to ensure that the online capacity checking is performed normally.
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