CN114675191B - Device and method for testing capacity of storage battery pack without off-line - Google Patents
Device and method for testing capacity of storage battery pack without off-line Download PDFInfo
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- CN114675191B CN114675191B CN202210176312.2A CN202210176312A CN114675191B CN 114675191 B CN114675191 B CN 114675191B CN 202210176312 A CN202210176312 A CN 202210176312A CN 114675191 B CN114675191 B CN 114675191B
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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]
- G01R31/371—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with remote indication, e.g. on external chargers
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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
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention provides a device and a method for testing the capacity of a storage battery pack without off-line. The device comprises a power supply control module, a timing module, a voltage acquisition module, a load module and an operation module. The operation module is used for: the timing module is instructed to record the test duration, and the test duration is obtained from the timing module; instructing a power supply control module to disconnect a line between a tested storage battery pack and a charging power supply for charging the tested storage battery pack so as to enable the tested storage battery pack to be in a discharging state; sending a voltage acquisition command to a voltage acquisition module; judging whether a test stopping condition is met or not according to the test duration and the voltage value of the tested storage battery pack; and determining the capacity of the tested storage battery pack according to the test duration and the rated discharge current value.
Description
Technical Field
The invention relates to the field of power supply systems, in particular to a device and a method for testing the capacity of a storage battery pack without off-line.
Background
With the continuous development of economy and the increasing influence of electric energy on life of people, the reliability of power supply is particularly important for urban areas with higher power load density. By establishing a distribution network mainly comprising a ring network structure, the reliability and the continuity of power supply can be effectively improved, and the distribution network is used as an important device in a ring network operation mode, namely a ring network cabinet, and is increasingly widely applied to distribution network transformation. The storage battery of the ring main unit is used as an emergency backup power supply when the power supply of the ring main unit fails, and a good working state is required to be kept at any time. Therefore, it is necessary to periodically perform a checkup discharge test on the ring main unit battery to test the capacity of the ring main unit battery. However, the battery check discharge test needs to be manually performed at present, so that a long time is required for completing one test, a large number of requirements of operation and maintenance of the ring main unit battery are met, and a large amount of human resources are inevitably occupied. Therefore, how to save the human resources required for the battery checkup discharge test is a technical problem to be solved.
Disclosure of Invention
The embodiment of the invention provides a device for testing the capacity of a storage battery pack without off-line, which aims to overcome the defect that a large amount of manpower resources are needed for manually carrying out a storage battery checkup discharge test in the prior art.
The embodiment of the invention provides a device for testing the capacity of a storage battery pack without off-line. The operation module is used for: the timing module is instructed to record testing duration, and the testing duration is obtained from the timing module, wherein the testing duration is the duration used for testing the capacity of the tested storage battery; instructing the power control module to disconnect a line between a battery under test and a charging power source that charges the battery under test so that the battery under test is in a discharged state; wherein the tested storage battery pack discharges at a rated discharge current value; sending a voltage acquisition command to a voltage acquisition module, and acquiring a voltage value of the tested storage battery pack under the condition that a circuit between the tested storage battery pack and a charging power supply for charging the tested storage battery pack is in a disconnected state from the voltage acquisition module; judging whether a test stopping condition is met or not according to the test duration or the voltage value of the tested storage battery pack; wherein the test stopping conditions are: the voltage value of the tested storage battery pack reaches a preset voltage threshold value or the test duration reaches a preset duration threshold value; if yes, then: instructing the power control module to switch on a line between the battery under test and a charging power supply for charging the battery under test; instructing the timing module to stop recording the test duration; determining the capacity of the tested storage battery pack according to the test duration and the rated discharge current value; the timing module is used for recording the test duration according to the indication of the operation module; the power supply control module is used for switching off or switching on a circuit between the tested storage battery pack and a charging power supply for charging the tested storage battery pack according to the instruction of the operation module; and the voltage acquisition module is used for acquiring the voltage value of the tested storage battery pack according to the voltage acquisition command of the operation module.
In some embodiments, the apparatus further comprises a discharge current testing module and a load module; the discharging current testing module is used for testing the current discharging current value of the tested storage battery pack according to the indication of the operation module; the load module is connected with the tested storage battery pack and is used for adjusting the current discharge current value of the tested storage battery pack according to the indication of the operation module; the operation module instructs the load module to adjust a present discharge current value of the battery pack under test so that the battery pack under test discharges at the rated discharge current value by: the operation module obtains the current discharge current value of the tested storage battery pack from the discharge current testing module; the operation module calculates a difference value between the rated discharge current value and the current discharge current value of the tested storage battery pack, and instructs the load module to increase or decrease the current discharge current value of the tested storage battery pack based on the difference value until the current discharge current value of the tested storage battery pack reaches the rated discharge current value.
In some embodiments, the determining the capacity of the battery pack under test according to the test duration and the rated discharge current value includes: calculating the product of the test duration and the rated discharge current value to obtain the discharge capacity of the tested storage battery, wherein the discharge capacity of the tested storage battery is the capacity consumed by the tested storage battery when the test stopping condition is met; determining the capacity of the tested storage battery pack according to the discharge capacity of the tested storage battery pack and a preset capacity coefficient; wherein the predetermined capacity coefficient corresponds to the predetermined voltage threshold.
In some embodiments, the determining the capacity of the battery pack under test from the discharge capacity of the battery pack under test and a predetermined capacity coefficient comprises: and calculating the ratio of the discharge capacity of the tested storage battery to a preset capacity coefficient, and taking the ratio as the capacity of the tested storage battery.
In some embodiments, the power control module comprises an electromagnetic relay, a first contact of one contact pair of the electromagnetic relay is connected with the positive electrode of the charging power supply, and a second contact of the contact pair is connected with the positive electrode of the tested storage battery pack; the power control module disconnects a line between the tested storage battery and a charging power supply for charging the tested storage battery according to the instruction of the operation module, and the power control module comprises: the electromagnetic relay opens a connection line between the first contact and the second contact in response to an instruction of the operation module.
In some embodiments, the power control module, according to the instruction of the operation module, turns on a line between the battery under test and a charging power source for charging the battery under test, includes: the electromagnetic relay is used for closing a connecting line between the first contact and the second contact in response to the instruction of the operation module.
In some embodiments, the power control module includes a relay switch control unit, a voltage comparison unit, and an electromagnetic relay unit; wherein: the relay switch control unit is used for indicating the electromagnetic relay unit to open or close a line between the tested storage battery pack and a charging power supply for charging the tested storage battery pack; the relay switch control unit comprises a first instruction input interface, a second instruction input interface and a relay switch signal output interface; the voltage comparison unit is used for comparing the voltage value of the tested storage battery with the preset voltage threshold value; the voltage comparison unit comprises a first voltage input interface, a second voltage input interface and a voltage comparison result output interface; wherein: the first voltage input interface is connected with the positive terminal of the tested storage battery pack; the second voltage input interface is connected with a reference voltage source, and the voltage value of the reference voltage source is equal to the preset voltage threshold value; the voltage comparison result output interface is connected with the first instruction input interface of the relay switch control unit and is used for outputting a voltage comparison result between the voltage value of the first voltage input interface and the voltage value of the second voltage input interface; the voltage comparison result is high level when the voltage value of the tested storage battery is smaller than the preset voltage threshold value, and is low level when the voltage value of the tested storage battery is larger than or equal to the preset voltage threshold value; the electromagnetic relay unit includes an electromagnetic relay; wherein: the electromagnetic relay comprises a contact pair, wherein a first contact of the contact pair is connected with the positive electrode of the charging power supply, and a second contact of the contact pair is connected with the positive electrode of the tested storage battery pack; the operation module comprises a charging power supply switch signal output interface which is connected with a second instruction input interface of the relay switch control unit; the power control module connects the circuit between the tested storage battery and the charging power supply for charging the tested storage battery according to the instruction of the operation module, and the circuit comprises: when the voltage comparison result output by the voltage comparison unit is a low level: the relay switch control unit responds to a charging power supply connection signal output by a charging power supply switch signal output interface of the operation module, and outputs a relay closing signal from the relay switch signal output interface; the electromagnetic relay unit closes a connection line between the first contact and the second contact in response to the relay closing signal.
In some embodiments, the power control module disconnecting a line between the battery under test and a charging power source charging the battery under test according to an instruction of the operation module includes: when the voltage comparison result output by the voltage comparison unit is a low level: the relay switch control unit responds to a charging power supply disconnection signal output by a charging power supply switch signal output interface of the operation module, and outputs a relay disconnection signal from the relay switch signal output interface; the electromagnetic relay unit opens a connection line between the first contact and the second contact in response to a relay-off signal output from the relay switch control unit.
In some embodiments, the operation module further includes a low-voltage alarm interface, where the low-voltage alarm interface is connected to the voltage comparison result output interface of the voltage comparison unit, and is configured to trigger a low-voltage alarm interrupt of the operation module when the voltage comparison result changes from low level to high level; the operation module is also used for: and when the low-power warning interrupt is triggered, the timing module is instructed to stop recording the test duration, and the capacity of the tested storage battery pack is determined according to the test duration and the rated discharge current value.
The embodiment of the invention provides a method for testing the capacity of a storage battery pack without off-line, which comprises the following steps: disconnecting a line between a tested storage battery and a charging power supply for charging the tested storage battery so as to enable the tested storage battery to be in a discharging state; acquiring a voltage value of the tested storage battery pack under the condition that a circuit between the tested storage battery pack and a charging power supply for charging the tested storage battery pack is in an off state; acquiring a test duration, wherein the test duration is the duration used for testing the capacity of the tested storage battery pack; judging whether a test stopping condition is met or not according to the test duration or the voltage value of the tested storage battery pack; wherein the test stopping conditions are: the voltage value of the tested storage battery pack reaches a preset voltage threshold value or the test duration reaches a preset duration threshold value; if yes, then: connecting a circuit between the tested storage battery pack and a charging power supply for charging the tested storage battery pack; and determining the capacity of the tested storage battery pack according to the test duration and the rated discharge current value.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a diagram of an application scenario of an apparatus for testing battery pack capacity without off-line in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic structural view of an apparatus for testing battery capacity without off-line according to a preferred embodiment of the present invention;
FIG. 3 is a flow chart of a method of testing battery pack capacity without off-line in accordance with a preferred embodiment of the present invention;
FIG. 4 is a schematic diagram of a power control module according to a preferred embodiment of the present invention;
fig. 5 is a schematic structural view of a further power control module according to a preferred embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. 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.
Fig. 1 is a view showing an application scenario of an apparatus for testing battery capacity without off-line according to a preferred embodiment of the present invention.
A charging power supply 110, a tested storage battery 120 and a work load 130 are arranged in the ring main unit shown in fig. 1. The ring main unit is a metal or nonmetal insulating cabinet body arranged on a distribution branch of the annular distribution network, and a group of power transmission and distribution electrical equipment is installed in the ring main unit.
As shown in fig. 1, the battery pack 120 under test is located in the ring main unit and is a ring main unit battery. The ring main unit storage battery is a storage battery for providing power for electrical equipment in the ring main unit. In a normal operating state, the charging power supply 110 is connected to the battery pack 120 to be tested, and charges the battery pack 120 to be tested. When testing the capacity of the battery pack under test 120 using the apparatus 140 that does not test the capacity of the battery pack off-line, it is necessary to disconnect the line of the charging power source 110 for charging the battery pack under test 120 so that the battery pack under test 120 is in a discharged state. When the test is stopped or completed, the charging power supply 110 needs to be turned on to charge the tested storage battery 120, and the tested storage battery 120 is continuously charged.
As shown in fig. 1, the workload 130 is connected to the battery pack under test 120, and the battery pack under test 120 supplies power to the workload 130. The workload 130 may be a power transmission and distribution electrical device within a ring main unit. When testing the capacity of the battery under test 120 using the device 140 that does not test the battery capacity offline, the operating current provided by the battery under test 120 to the workload 130 is part of the discharge current of the battery under test 120 during the test.
As shown in fig. 1, a device 140 for testing the capacity of the storage battery pack not offline is arranged in the ring main unit, and the storage battery pack 120 to be tested is automatically tested periodically to determine the capacity thereof. The test period may be 6 months or 1 year, etc. depending on the maintenance requirements of the battery pack 130 under test, and is not limited by the expression of the present specification.
Fig. 2 is a schematic structural view of an apparatus for testing battery capacity without off-line according to a preferred embodiment of the present invention.
As shown in fig. 2, the apparatus for testing the capacity of the battery pack without off-line includes: the device comprises an operation module 210, a timing module 220, a voltage acquisition module 230, a power supply control module 240, a load module 250 and a discharge current test module 260.
The operation module 210 is constructed based on a processing system on chip (e.g., raspberry pie), and the processing chip of the operation module 210 completes a checkup discharge test procedure by executing a program solidified in the operation module 210 to test the capacity of the battery pack under test. In some embodiments, the battery pack under test is a ring main unit battery pack.
After the storage battery pack is used for a period of time, the actual capacity of the battery pack is gradually reduced due to the reasons of falling off of active substances in the battery, deterioration, reduction of electrolyte, corrosion or vulcanization of a positive grid and the like. In order to master the capacity of the battery pack and ensure the power supply time, the battery pack in use should be periodically subjected to a discharge test to test the capacity of the battery pack. The checkup discharge test is one of the commonly used battery discharge tests. The checkup discharge test is to perform a discharge test with an actual load at a certain period. Wherein, the check discharge test which is not off-line (namely the storage battery pack is in a normal working state) is as follows: discharging 50% or 70% of rated capacity of the storage battery by rated load current, immediately charging after discharging, and repeatedly discharging for 2-3 times. And finally, calculating according to the rated discharge current value and the discharge time to obtain the capacity of the storage battery.
In order to test the capacity of the battery under test after a period of use, the operation module 210 starts a checkup discharge test to test the capacity of the battery under test after determining that the test start condition is satisfied. Test initiation conditions include, but are not limited to: reaching a predetermined test time, operator initiated operation, etc.
In some embodiments, the computing module 210 may initiate a test procedure at predetermined test time intervals. The test time interval may be 1 month, half year, or other time interval, for example, 1 year, not limited by the expression of the present specification. The computing module 210 may acquire a standard time (e.g., beijing time) from another module or the server through wireless communication, and use the standard time as a system time of the computing module 210, and perform timing according to the system time, so as to start testing accurately according to a predetermined test time interval.
In some embodiments, the device that does not test the capacity of the battery pack offline may also initiate the test in other manners, for example, the operator may input the time for initiating the test through the man-machine interface, and the operation module 210 initiates the test according to the time for initiating the test, which is not limited by the description herein.
After the test starts, the operation module 210 is configured to:
1. Instruct the timing module 220 to record the test duration and obtain the test duration from the timing module 220.
The test duration may be the duration used to test the capacity of the battery under test.
2. The power control module 240 is instructed to disconnect the line between the battery pack under test and the charging power source that charges the battery pack under test so that the battery pack under test is in a discharged state.
The tested storage battery is connected with the charging power supply in a normal working state. When the capacity of the battery pack to be tested is started, the battery pack to be tested needs to be in a discharging state, so that a circuit between the battery pack to be tested and a charging power supply needs to be disconnected.
And when the tested storage battery pack is in a discharging state, continuously providing working current for the working load of the tested storage battery pack. The working load of the tested storage battery pack is the load connected when the tested storage battery pack works normally, such as power transmission and distribution electrical equipment in the ring main unit.
The battery under test needs to be discharged at a rated discharge current value, while the current consumed by the operating load of the battery under test is typically lower than the rated discharge current value. Thus, the apparatus for testing battery pack capacity without off-line further includes a load module 250. The load module 250 is connected with the battery pack to be tested, and the load module 250 can adjust the discharge current of the battery pack to be tested by changing the equivalent resistance of the load module. The load module 250 may be an intelligent load module, the load current of which is continuously adjustable. In some embodiments, the current value output by the load module 250 may be set according to a difference between the rated discharge current value and the current consumed by the work load of the battery pack under test, such that the battery pack under test is discharged at the rated discharge current value.
In some embodiments, there may be fluctuations in the current consumed by the workload of the battery pack being tested. Thus, the apparatus that does not test the battery pack capacity offline further includes a discharge current test module 260.
The discharging current testing module 260 is used for testing the present discharging current value of the tested storage battery pack according to the instruction of the operation module 210. The discharge current test module 260 may be constructed in a variety of ways. For example, the discharge current test module 260 is constructed using a hall sensor. For another example, a circuit having a current test function may be built as the discharge current test module 260.
In some embodiments, the load module 250 adjusts the present discharge current of the battery pack under test according to the direction of the operation module 210.
The operation module 210 may instruct the load module 250 to adjust the present discharge current of the battery pack under test to discharge the battery pack under test at the rated discharge current value by: the operation module 210 obtains the present discharge current value of the battery pack under test from the discharge current test module 260, and the operation module 210 calculates a difference between the rated discharge current value and the present discharge current value of the battery pack under test and instructs the load module 250 to increase or decrease the present discharge current value of the battery pack under test based on the difference until the present discharge current value of the battery pack under test reaches the rated discharge current value. For example, the rated discharge current value is 2.0 amps and the current discharge current value of the battery under test is 1.5 amps, the operation module 210 instructs the load module 250 to increase the current discharge current of the battery under test until the current discharge current value of the battery under test reaches 2.0 amps.
3. A voltage acquisition command is transmitted to the voltage acquisition module 230, and a voltage value of the battery pack under test in a condition that a line between the battery pack under test and a charging power source charging the battery pack under test is in a disconnected state is acquired from the voltage acquisition module 230.
In the testing process, the tested storage battery pack is used as a power supply of the working load, so that the voltage of the tested storage battery pack in the testing process cannot be lower than the rated working voltage, and the working load can be ensured to work normally. In order to avoid that the voltage of the battery pack under test is too low during the testing of the capacity of the battery pack under test, the voltage of the battery pack under test needs to be monitored.
4. Judging whether a test stopping condition is met or not according to the test duration or the voltage value of the tested storage battery; wherein, the test stopping conditions are: the voltage value of the tested storage battery pack reaches a preset voltage threshold value or the testing duration reaches a preset duration threshold value; if so, the power control module 240 is instructed to switch on the line between the battery under test and the charging power source that charges the battery under test, and the timing module is instructed to stop recording the test duration.
The predetermined duration threshold may be 5 hours or other values, and is not limited by the description of the present specification. The predetermined voltage threshold may be set according to a rated operating voltage of the battery pack under test, and may be greater than or equal to the rated operating voltage. For example, the rated operating voltage is 24V, the predetermined voltage threshold may be set to 24.1V, or the predetermined voltage threshold may be set to 24V or other values, which are not limited by the expression of the present specification.
If the test duration reaches the preset duration threshold value, the current test on the capacity of the tested storage battery pack can be stopped. In some embodiments, the next test may be continued after the battery under test is charged, and if the number of discharges reaches two or a predetermined other number, the checkup discharge test is completed.
If the test duration does not reach the preset duration threshold, the voltage of the tested storage battery is reduced to the preset voltage threshold, the test of the capacity of the tested storage battery can be stopped at this time, and related personnel can determine that the capacity of the tested storage battery is too low according to the test result so as to be required to be overhauled or replaced in order to enable the work load to work normally.
After the test is stopped, the operation module 210 determines the capacity of the tested storage battery pack according to the test duration and the rated discharge current value. In some embodiments, the operation module 210 calculates a product of the test duration and the rated discharge current value to obtain a discharge capacity of the tested battery pack, where the discharge capacity of the tested battery pack is a capacity consumed by the tested battery pack when the test stop condition is satisfied. Then, the operation module 210 determines the capacity of the tested battery pack according to the discharge capacity of the tested battery pack and the predetermined capacity coefficient. In some embodiments, the computing module 210 may use a ratio of the discharge capacity of the battery pack under test to a predetermined capacity coefficient as the capacity of the battery pack under test.
The predetermined capacity coefficient corresponds to a predetermined voltage threshold, and may reflect a ratio of a discharge capacity of the battery under test to a capacity of the battery under test. Different predetermined voltage thresholds correspond to different predetermined capacity coefficients. For example, the rated voltage of the battery pack under test is 24V, the predetermined voltage threshold is set to 24.2V, the corresponding predetermined capacity coefficient is 0.5, which can reflect that the discharge capacity of the battery pack under test is 50% of the rated capacity of the battery pack under test, and if the discharge capacity is 10 ampere hours (Ah), the capacity of the battery pack under test can be calculated to be 20 ampere hours. For example, the rated voltage of the battery pack to be tested is 24V, the predetermined voltage threshold is set to 24V, the corresponding predetermined capacity coefficient is 0.7, and it can be reflected that the discharge capacity of the battery pack to be tested is 70% of the rated capacity of the battery pack to be tested, and if the discharge capacity is 10 ampere hours (Ah), the capacity of the battery pack to be tested can be calculated to be about 14.2 ampere hours.
The timing module 220 is configured to record the test duration according to the instruction of the operation module 210.
The timing module 220 may be a module having a timing function, for example, a module implemented on a raspberry scale.
The power control module 240 is configured to disconnect or connect a line between the tested battery pack and a charging power source for charging the tested battery pack according to an instruction of the operation module 210.
In some embodiments, the power control module 240 may include an electromagnetic relay, as shown in fig. 4, with a first contact of one contact pair of the electromagnetic relay connected to the positive pole of the charging power source and a second contact of the contact pair connected to the positive pole of the battery under test.
When the power control module 240 disconnects the line between the battery under test and the charging power source for charging the battery under test according to the instruction of the operation module 210, the electromagnetic relay disconnects the connection line between the first contact and the second contact under the driving of the operation module 210, thereby disconnecting the line between the battery under test and the charging power source.
When the power control module 240 turns on the line between the battery under test and the charging power source for charging the battery under test according to the instruction of the operation module 210, the electromagnetic relay closes the connection line between the first contact and the second contact under the driving of the operation module 210, thereby turning on the line between the battery under test and the charging power source.
An electromagnetic relay is a relay that generates a predetermined response by a relative movement of mechanical parts under the action of electromagnetic induction, and is generally used in an automatic control circuit. Electromagnetic relays have a control system (also known as an input loop) and a controlled system (also known as an output loop). The input loop is composed of a control coil, an iron core arranged in the control coil, a low-voltage power supply and the like, the output loop is composed of an armature, a contact spring and a high-voltage power supply and the like, and the input loop and the output loop are mutually insulated. Electromagnetic relays generally include three contacts: a normally open contact, a normally closed contact and a movable contact arranged at one end of the armature. When the coil of the electromagnetic relay is not connected to a power supply, the movable contact of the armature is closed with the normally closed contact and is disconnected with the normally open contact.
In some embodiments, the first contact is a normally open contact of the electromagnetic relay and the second contact is a moving contact of the armature. When rated voltage is applied to two ends of a coil of the electromagnetic relay, certain current is passed through the coil, so that an electromagnetic effect is generated, the armature is attracted to move towards the normally closed contact, and the movable contact of the armature is driven to be closed with the normally open contact, namely the first contact is closed with the second contact. When the coil is powered off, the attraction force exerted by the armature is also eliminated, and the armature returns to the original position, so that the first contact is disconnected from the second contact. The purpose of connecting and closing the circuit between the tested storage battery and the charging power supply for charging the tested storage battery is achieved through the sucking and releasing process.
As shown in fig. 4, the electromagnetic relay unit includes an electromagnetic relay, a tertiary pipe, and a diode. One output pin of the operation module 210 is connected with a base electrode of a triode, an emitter electrode of the triode is connected to one end of an electromagnetic relay coil, the other end of the electromagnetic relay coil is connected to a power supply VCC, and a diode connected in parallel with the electromagnetic relay coil is used for absorbing reverse electromotive force generated when the electromagnetic relay coil is powered off.
When the operation module 210 instructs the power control module 240 to disconnect the line between the battery under test and the charging power source for charging the battery under test, the operation module 210 outputs a low level through the output pin, the triode is turned off, no voltage difference exists between the two ends of the electromagnetic relay coil, the first contact is disconnected from the second contact, and the line between the battery under test and the charging power source for charging the battery under test is disconnected.
When the operation module 210 instructs the power control module 240 to close the line between the battery under test and the charging power source for charging the battery under test, the operation module 210 outputs a high level through the output pin, the triode is saturated and turned on, the power VCC is applied to both ends of the electromagnetic relay coil, the first contact and the second contact are closed, and the line between the battery under test and the charging power source for charging the battery under test is closed.
In some embodiments, in order to ensure the electrical safety of the workload during the non-offline test, the voltage value of the tested battery pack is prevented from falling below the predetermined voltage threshold, and the power control module 240 also has a low-power protection function. When the voltage value of the battery under test is too low, the power control module 240 may switch on a line between the battery under test and a charging power source charging the battery under test, so that the charging power source charges the battery under test, and the power control module 240 may report a low electric warning to the operation module 210.
To achieve the low-voltage protection function described above, in some embodiments, the power control module 240 includes a relay switch control unit, a voltage comparison unit, and an electromagnetic relay unit.
The relay switch control unit is used for indicating the electromagnetic relay unit to open or close a line between the tested storage battery and a charging power supply for charging the tested storage battery. The relay switch control unit comprises a first instruction input interface, a second instruction input interface and a relay switch signal output interface.
The relay switch control unit is a chip or a circuit which can realize OR logic operation. When any one of the first instruction input interface and the second instruction input interface is at a high level, the relay switch signal output interface outputs the high level; when the first instruction input interface and the second instruction input interface are both in low level, the relay switch signal output interface outputs low level.
In some embodiments, as shown in fig. 5, the electromagnetic relay unit includes an electromagnetic relay, a tertiary tube, and a diode. The relay switch signal output interface of the relay switch control unit is connected with the base electrode of the triode, the emitter electrode of the triode is connected to one end of the electromagnetic relay coil, and the other end of the electromagnetic relay coil is connected to the power supply VCC. An electromagnetic relay includes a pair of contacts: the first contact is a normally open contact of the electromagnetic relay, and the second contact is a movable contact of the armature. The first contact is connected with the positive electrode of the charging power supply, and the second contact in the contact pair is connected with the positive electrode of the storage battery pack to be tested.
The voltage comparison unit is used for comparing the voltage value of the tested storage battery with a preset voltage threshold value. The voltage comparison unit comprises a first voltage input interface, a second voltage input interface and a voltage comparison result output interface.
In some embodiments, the voltage comparing unit may be a chip having a voltage comparing function, and outputs a high level when a voltage of a non-inverting input terminal of the chip is higher than a voltage of an inverting input terminal. The first voltage input interface is an inverting input end of the chip, and the second voltage input interface is a non-inverting input end of the chip.
In some embodiments, as shown in fig. 5, the first voltage input interface is connected to the positive terminal of the battery under test. The second voltage input interface is connected with a reference voltage source, and the voltage value of the reference voltage source is equal to a preset voltage threshold value. The reference voltage source can be obtained by dividing the power supply of the device which does not test the capacity of the storage battery off line through two or more resistors.
In some embodiments, as shown in fig. 5, the voltage comparison result output interface is connected to the first command input interface of the relay switch control unit, and is configured to output a voltage comparison result between the voltage value of the first voltage input interface and the voltage value of the second voltage input interface. When the voltage value of the tested storage battery is smaller than the preset voltage threshold value, the voltage comparison result is high level, and when the voltage value of the tested storage battery is larger than or equal to the preset voltage threshold value, the voltage comparison result is low level.
In the process of off-line testing, when the voltage of the tested battery pack is too low due to a certain reason (for example, the power supply of the device for off-line testing the capacity of the battery pack fails, resulting in failure of the operation module 210 to monitor the voltage value of the tested battery pack through the voltage acquisition module 230, or the voltage of the tested battery pack is rapidly reduced due to a defect in the tested battery pack during discharging, etc.), the voltage of the tested battery pack is reduced too much and is smaller than a predetermined voltage threshold value, the voltage comparison result output interface outputs a high level to the first command input interface of the relay switch control unit, so that the relay switch signal output interface of the relay switch control unit outputs a high level, as shown in fig. 5, the triode of the electromagnetic relay switch control unit is saturated and turned on, the power supply VCC is applied to both ends of the electromagnetic relay coil, the first contact and the second contact are closed, and the charging power supply starts to charge the tested battery pack.
In some embodiments of the present application, the voltage value of the tested battery pack is monitored by the voltage comparing unit in the power control module 240, and when the voltage value of the tested battery pack is smaller than the predetermined voltage threshold value, the high level control relay switch control unit output by the voltage comparing unit closes the first contact and the second contact of the electromagnetic relay, so as to close the line between the tested battery pack and the charging power supply for charging the tested battery pack, so that the charging power supply can charge the tested battery pack, and the electricity safety of the workload in the offline testing process is effectively ensured.
In some embodiments, the operation module 210 includes a charging power switch signal output interface, as shown in fig. 5, connected with a second instruction input interface of the relay switch control unit.
When the voltage value of the tested storage battery pack is greater than or equal to the preset voltage threshold value, the voltage comparison result output by the voltage comparison unit is in a low level, and the output signal of the relay switch control unit is determined by the signal output by the charging power supply switch signal output interface of the operation module 210.
In some embodiments, when the charging power supply switching signal output interface of the operation module 210 outputs the charging power supply connection signal (high level), the relay switching control unit outputs the relay closing signal (high level) from the relay switching signal output interface in response to the charging power supply connection signal. The electromagnetic relay unit closes a connection line between the first contact and the second contact in response to a relay closing signal. Specifically, as shown in fig. 5, the transistor of the electromagnetic relay unit is saturated and turned on, a power source VCC is applied to both ends of the electromagnetic relay coil, the first contact and the second contact are closed, and a line between the battery under test and a charging power source for charging the battery under test is closed.
In some embodiments, when the charging power switch signal output interface of the operation module 210 outputs the charging power off signal (low level), the relay switch control unit outputs the relay off signal (low level) from the relay switch signal output interface in response to the charging power off signal. The electromagnetic relay unit opens a connection line between the first contact and the second contact in response to a relay open signal. Specifically, as shown in fig. 5, the triode of the electromagnetic relay unit is turned off, a voltage difference does not exist between two ends of the electromagnetic relay coil, the first contact is disconnected from the second contact, and the line between the battery under test and the charging power supply for charging the battery under test is disconnected.
In some embodiments, the operation module 210 further includes a low-voltage alarm interface, where the low-voltage alarm interface is connected to the voltage comparison result output interface of the voltage comparison unit, and is configured to trigger the low-voltage alarm interrupt of the operation module 210 when the voltage comparison result changes from low level to high level. The operation module 210 may register a low-electric-signal-interrupt service function in the initialization procedure, and when the low-electric-signal interface of the operation module 210 receives a low-to-high voltage pulse, the low-electric-signal-interrupt is triggered, and the low-electric-signal-interrupt service function is executed.
The operation module 210 may instruct the timing module to stop recording the test duration in the low-power alarm interrupt service function, and determine the capacity of the tested storage battery pack according to the test duration and the rated discharge current value. The operation module 210 can also determine the capacity of the tested battery pack more accurately under the condition that the voltage of the tested battery pack drops rapidly through low-voltage alarm interruption. The voltage acquisition module 230 is configured to acquire a voltage value of the tested battery pack according to the voltage acquisition command of the operation module 210.
The voltage acquisition module 230 may be a digital acquisition device that implements an analog-to-digital conversion function. The digital acquisition device may include: the device comprises a sensor, a signal filtering unit, a signal amplifier, an analog-to-digital converter, a filtering unit, a microprocessor and the like. The digital acquisition device can accurately acquire the voltage value of the tested storage battery.
According to some embodiments of the invention, the operation module starts the test at regular time, so that manual intervention is not needed for starting the test, the operation module controls the power control module to switch the charging/discharging mode of the tested storage battery, the test is automatically stopped according to the test requirement by the test duration recorded by the timing module, the automatic test of the storage battery capacity of the ring main unit is realized, and the operation module monitors the voltage value of the tested storage battery in the test process, so that the electricity safety of the work load of the tested storage battery is ensured, and therefore, the test of the storage battery capacity of the ring main unit is not needed to be manually performed, and a large amount of manpower resources are saved. And moreover, due to the realization of automatic test, the reading efficiency of the voltage value of the tested storage battery in the ring main unit storage battery capacity test process is effectively improved.
In some embodiments, the apparatus that does not test battery pack capacity offline further includes a presentation module 270. The presentation module 270 may be a terminal having a man-machine interaction interface. In some embodiments, the power control module, the timing module, the voltage acquisition module, the load module, and the operation module are disposed within the ring main unit, and the display module is disposed outside the ring main unit. The display module 270 can display related data in the process of checking the tested storage battery pack through interfaces such as web pages, APP installed on a mobile phone and the like, and related personnel can conveniently acquire the test conditions of the ring main unit storage batteries at different places. In some embodiments, the presentation module 270 is to: the test duration and the voltage value of the battery under test are obtained from the operation module 210. The display module 270 obtains the test duration and the voltage value of the tested storage battery from the operation module 210 in a wireless communication manner.
The device for testing the capacity of the storage battery pack not in an off-line mode further comprises a device power supply module, wherein the device power supply module converts a power supply (for example, 110V power supply) of the ring main unit into a direct current power supply, for example, a direct current 5V power supply, for supplying power to the device for testing the capacity of the storage battery pack not in an off-line mode.
Fig. 3 is a flow chart of a method of testing battery pack capacity without off-line in accordance with a preferred embodiment of the present invention.
As shown in fig. 3, the method of testing the capacity of the battery pack without off-line may include the steps of:
step 310, disconnect the line between the battery pack under test and the charging power source that charges the battery pack under test, so that the battery pack under test is in a discharged state.
Step 320, obtaining a voltage value of the tested battery pack under a condition that a line between the tested battery pack and a charging power source for charging the tested battery pack is in an off state.
Step 330, a test duration is obtained. The test duration is the duration taken to test the capacity of the battery pack.
Step 340, judging whether the test stopping condition is met according to the voltage value of the tested storage battery pack in the test duration; if so, connecting a circuit between the tested storage battery pack and a charging power supply for charging the tested storage battery pack.
Wherein, the test stopping conditions are: the voltage value of the tested storage battery pack reaches a preset voltage threshold value or the testing duration reaches a preset duration threshold value;
And 350, determining the capacity of the tested storage battery pack according to the test duration and the discharge current value.
In some embodiments, the test duration and the voltage value of the battery under test are displayed through a human-computer interaction interface.
Details of steps 310-350 are referred to in the relevant content of fig. 2, and are not described here.
The foregoing is merely illustrative embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present invention, and the invention should be covered. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. The device for testing the capacity of the storage battery pack without off-line is characterized by comprising a power supply control module, a timing module, a voltage acquisition module and an operation module:
the operation module is used for:
the timing module is instructed to record testing duration, and the testing duration is obtained from the timing module, wherein the testing duration is the duration used for testing the capacity of the tested storage battery;
Instructing the power control module to disconnect a line between a battery under test and a charging power source that charges the battery under test so that the battery under test is in a discharged state; wherein the tested storage battery pack discharges at a rated discharge current value;
sending a voltage acquisition command to a voltage acquisition module, and acquiring a voltage value of the tested storage battery pack under the condition that a circuit between the tested storage battery pack and a charging power supply for charging the tested storage battery pack is in a disconnected state from the voltage acquisition module;
Judging whether a test stopping condition is met or not according to the test duration or the voltage value of the tested storage battery pack; wherein the test stopping conditions are: the voltage value of the tested storage battery pack reaches a preset voltage threshold value or the test duration reaches a preset duration threshold value;
if yes, then:
Instructing the power control module to switch on a line between the battery under test and a charging power supply for charging the battery under test;
Instructing the timing module to stop recording the test duration;
Determining the capacity of the tested storage battery pack according to the test duration and the rated discharge current value;
the timing module is used for recording the test duration according to the indication of the operation module;
The power supply control module is used for switching off or switching on a circuit between the tested storage battery pack and a charging power supply for charging the tested storage battery pack according to the instruction of the operation module;
And the voltage acquisition module is used for acquiring the voltage value of the tested storage battery pack according to the voltage acquisition command of the operation module.
2. The apparatus of claim 1, further comprising a discharge current testing module and a load module;
the discharging current testing module is used for testing the current discharging current value of the tested storage battery pack according to the indication of the operation module;
The load module is connected with the tested storage battery pack and is used for adjusting the current discharge current value of the tested storage battery pack according to the indication of the operation module;
the operation module instructs the load module to adjust a present discharge current value of the battery pack under test so that the battery pack under test discharges at the rated discharge current value by:
The operation module obtains the current discharge current value of the tested storage battery pack from the discharge current testing module;
The operation module calculates a difference value between the rated discharge current value and the current discharge current value of the tested storage battery pack, and instructs the load module to increase or decrease the current discharge current value of the tested storage battery pack based on the difference value until the current discharge current value of the tested storage battery pack reaches the rated discharge current value.
3. The apparatus of claim 1, wherein said determining the capacity of the battery under test based on the test duration and the rated discharge current value comprises:
calculating the product of the test duration and the rated discharge current value to obtain the discharge capacity of the tested storage battery, wherein the discharge capacity of the tested storage battery is the capacity consumed by the tested storage battery when the test stopping condition is met;
Determining the capacity of the tested storage battery pack according to the discharge capacity of the tested storage battery pack and a preset capacity coefficient; wherein the predetermined capacity coefficient corresponds to the predetermined voltage threshold.
4. The apparatus of claim 3, wherein said determining the capacity of said battery under test based on the discharge capacity of said battery under test and a predetermined capacity coefficient comprises:
and calculating the ratio of the discharge capacity of the tested storage battery to a preset capacity coefficient, and taking the ratio as the capacity of the tested storage battery.
5. The apparatus of claim 1, wherein the power control module comprises an electromagnetic relay, a first contact of one contact pair of the electromagnetic relay being connected to a positive pole of the charging power source, a second contact of the contact pair being connected to a positive pole of the battery under test;
the power control module disconnects a line between the tested storage battery and a charging power supply for charging the tested storage battery according to the instruction of the operation module, and the power control module comprises:
the electromagnetic relay opens a connection line between the first contact and the second contact in response to an instruction of the operation module.
6. The apparatus of claim 5, wherein the power control module switching on a line between the battery under test and a charging power source charging the battery under test according to an instruction of the operation module comprises:
The electromagnetic relay is used for closing a connecting line between the first contact and the second contact in response to the instruction of the operation module.
7. The apparatus of claim 1, wherein the power control module comprises a relay switch control unit, a voltage comparison unit, and an electromagnetic relay unit; wherein:
The relay switch control unit is used for indicating the electromagnetic relay unit to open or close a line between the tested storage battery pack and a charging power supply for charging the tested storage battery pack; the relay switch control unit comprises a first instruction input interface, a second instruction input interface and a relay switch signal output interface;
The voltage comparison unit is used for comparing the voltage value of the tested storage battery with the preset voltage threshold value; the voltage comparison unit comprises a first voltage input interface, a second voltage input interface and a voltage comparison result output interface; wherein:
the first voltage input interface is connected with the positive terminal of the tested storage battery pack;
the second voltage input interface is connected with a reference voltage source, and the voltage value of the reference voltage source is equal to the preset voltage threshold value;
The voltage comparison result output interface is connected with the first instruction input interface of the relay switch control unit and is used for outputting a voltage comparison result between the voltage value of the first voltage input interface and the voltage value of the second voltage input interface; the voltage comparison result is high level when the voltage value of the tested storage battery is smaller than the preset voltage threshold value, and is low level when the voltage value of the tested storage battery is larger than or equal to the preset voltage threshold value;
The electromagnetic relay unit includes an electromagnetic relay; wherein:
the electromagnetic relay comprises a contact pair, wherein a first contact of the contact pair is connected with the positive electrode of the charging power supply, and a second contact of the contact pair is connected with the positive electrode of the tested storage battery pack;
the operation module comprises a charging power supply switch signal output interface which is connected with a second instruction input interface of the relay switch control unit;
The power control module connects the circuit between the tested storage battery and the charging power supply for charging the tested storage battery according to the instruction of the operation module, and the circuit comprises:
When the voltage comparison result output by the voltage comparison unit is a low level:
the relay switch control unit responds to a charging power supply connection signal output by a charging power supply switch signal output interface of the operation module, and outputs a relay closing signal from the relay switch signal output interface;
The electromagnetic relay unit closes a connection line between the first contact and the second contact in response to the relay closing signal.
8. The apparatus of claim 7, wherein the power control module disconnecting a line between the battery under test and a charging power source charging the battery under test according to an instruction of the operation module comprises:
When the voltage comparison result output by the voltage comparison unit is a low level:
The relay switch control unit responds to a charging power supply disconnection signal output by a charging power supply switch signal output interface of the operation module, and outputs a relay disconnection signal from the relay switch signal output interface;
the electromagnetic relay unit opens a connection line between the first contact and the second contact in response to a relay-off signal output from the relay switch control unit.
9. The apparatus of claim 7, wherein the operation module further comprises a low-electric warning interface connected to a voltage comparison result output interface of the voltage comparison unit for triggering a low-electric warning interrupt of the operation module when the voltage comparison result is changed from a low level to a high level;
The operation module is also used for: and when the low-power warning interrupt is triggered, the timing module is instructed to stop recording the test duration, and the capacity of the tested storage battery pack is determined according to the test duration and the rated discharge current value.
10. A method of testing battery pack capacity without off-line, comprising:
disconnecting a line between a tested storage battery and a charging power supply for charging the tested storage battery so as to enable the tested storage battery to be in a discharging state;
Acquiring a voltage value of the tested storage battery pack under the condition that a circuit between the tested storage battery pack and a charging power supply for charging the tested storage battery pack is in an off state;
acquiring a test duration, wherein the test duration is the duration used for testing the capacity of the tested storage battery pack;
Judging whether a test stopping condition is met or not according to the test duration or the voltage value of the tested storage battery pack; wherein the test stopping conditions are: the voltage value of the tested storage battery pack reaches a preset voltage threshold value or the test duration reaches a preset duration threshold value;
if yes, then:
connecting a circuit between the tested storage battery pack and a charging power supply for charging the tested storage battery pack;
And determining the capacity of the tested storage battery pack according to the test duration and the rated discharge current value.
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| CN101764426A (en) * | 2010-02-05 | 2010-06-30 | 四川电力试验研究院 | Protective device for on-line discharge capacity test of storage battery and testing method thereof |
| CN110297188A (en) * | 2019-07-24 | 2019-10-01 | 国网河北省电力有限公司邢台供电分公司 | Monitored System of Industrial Storage Cell |
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| US9098390B2 (en) * | 2010-11-15 | 2015-08-04 | Lifesafety Power, Inc. | Apparatus and method for a networked power management system with one-click remote battery discharge testing |
| CN105103404A (en) * | 2013-04-03 | 2015-11-25 | 株式会社自动网络技术研究所 | Control device, power supply control device, charging control method, charging control device, and vehicle power supply device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101764426A (en) * | 2010-02-05 | 2010-06-30 | 四川电力试验研究院 | Protective device for on-line discharge capacity test of storage battery and testing method thereof |
| CN110297188A (en) * | 2019-07-24 | 2019-10-01 | 国网河北省电力有限公司邢台供电分公司 | Monitored System of Industrial Storage Cell |
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