CN111766525A - Method for measuring charge capacity of lithium iron phosphate battery and charging method - Google Patents
Method for measuring charge capacity of lithium iron phosphate battery and charging method Download PDFInfo
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- CN111766525A CN111766525A CN202010487582.6A CN202010487582A CN111766525A CN 111766525 A CN111766525 A CN 111766525A CN 202010487582 A CN202010487582 A CN 202010487582A CN 111766525 A CN111766525 A CN 111766525A
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- iron phosphate
- lithium iron
- phosphate battery
- charging
- charge capacity
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
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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]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
Abstract
The invention discloses a method for measuring the charge capacity of a lithium iron phosphate battery and a charging method, wherein the method for measuring the charge capacity comprises the following steps: the energy storage converter enters a standby state; starting a management system and the monitoring system; the monitoring system detects whether the battery system management unit receives the alarm signal, and if not, the state is reset and the detection is carried out again; and the management system completes the capacity check and charge capacity measurement of the lithium iron phosphate battery, the whole charging and discharging process is finished, and the charging and discharging efficiency of the management system is counted. The invention has the beneficial effects that: the invention automatically performs capacity measurement and charge capacity measurement of the battery system by matching with the monitoring system and the energy storage converter, improves the safety and reliability of the lithium iron phosphate battery, effectively prolongs the service life of the lithium iron phosphate battery, greatly improves the measurement precision of the charge capacity of the lithium iron phosphate battery, improves the energy storage service efficiency of the lithium iron phosphate battery, and ensures the use safety of the lithium iron phosphate battery in a large-scale energy storage power station.
Description
Technical Field
The invention relates to the technical field of iron lithium batteries, in particular to a method for measuring the charge capacity of a lithium iron phosphate battery and a charging method.
Background
With the continuous expansion of the development scale of distributed energy and new energy, the intelligent storage and transmission of electric power are realized through a smart grid, which is the optimization trend of an energy system. The requirements of the energy storage system on the performance of the battery are high capacity, long service life, quick response and trickle charging, and the lithium iron phosphate battery has high energy density ratio and power density ratio, good charging and discharging efficiency and flexible grouping mode, can meet the requirements of large-scale energy storage at present, and has become the key point of energy storage research. However, the lithium iron phosphate battery has obvious non-linearity, inconsistency and time-varying characteristics, so that the discreteness among the batteries in a group is increased easily due to the influences of the charge acceptance, the self-discharge rate, the capacity decay rate and the like among the single batteries in the long-term charge and discharge process, the performance decay is intensified, and serious conditions even have serious safety threat consequences. If the lithium iron phosphate battery is not effectively managed, the performance of the battery pack can be quickly attenuated, and finally the service life of the large-scale battery pack is not guaranteed.
At present, due to the characteristics of large number of lithium iron phosphate batteries and complex series-parallel connection form, a management system capable of effectively managing the safe and controllable operation of the lithium iron phosphate batteries is not available, the existing charge capacity measuring method for the batteries generally adopts an ampere-hour integration method, but the traditional charge capacity measuring method is insufficient in precision, so that an accurate numerical value cannot be obtained when the charge capacity of the batteries is estimated, and the judgment on the safety of the lithium iron phosphate batteries is influenced.
With the continuous expansion of the development scale of distributed energy and new energy, the application of the lithium iron phosphate battery in an energy storage system is gradually widened.
With the rapid development of lithium ion storage batteries, after single batteries with performance meeting the use requirements are connected in series to form a group, due to the lack of effective management, the safety of a battery pack is greatly reduced, the service life is greatly shortened, and even serious accidents such as battery combustion and explosion occur, so that people are prompted to deeply explore and research the charging management method of the lithium ion battery pack, and in order to ensure the management of the whole life cycle of a lithium iron phosphate battery, the activity of the battery is increased, and the occurrence of large impact in the charging process is avoided, in the process of the whole life cycle, the selection of a proper charging mode is very important.
Therefore, in order to solve the above problems, it is necessary to provide a method for measuring the charge capacity of a lithium iron phosphate battery and a method for charging the lithium iron phosphate battery.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a method for measuring the charge capacity of a lithium iron phosphate battery and a charging method, and solves the problems.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the method for measuring the charge capacity of the lithium iron phosphate battery comprises the following steps: (1) the energy storage converter enters a standby state; (2) starting the management system and the monitoring system; (3) the monitoring system detects whether the battery system management unit receives an alarm signal, and if not, the state is reset and the detection is carried out again; if yes, entering the step (4); (4) the management system is used for measuring the lower limit capacity and the charge capacity of the lithium iron phosphate battery to be 0%; (5) the management system is used for measuring the upper limit capacity and the charge capacity of the lithium iron phosphate battery to be 100%; (6) and (5) repeating the step (4) once, finishing the capacity check and the charge capacity measurement of the lithium iron phosphate battery by the management system, finishing the whole charging and discharging process, and counting the charging and discharging efficiency of the management system.
Preferably, the specific process of step (4) in the determination method is as follows: issuing commands of full discharge of the management system and grid-connected discharge of the energy storage converter; the management system receives the command and then carries out full discharge; the energy storage converter receives the command and then performs grid-connected discharge until the lithium iron phosphate battery finishes discharging, namely the lithium iron phosphate battery is emptied, and the energy storage converter enters a standby state again; and the management system is used for measuring the lower limit capacity and the charge capacity of the lithium iron phosphate battery to be 0%.
Preferably, the specific process of step (5) in the charge capacity measuring method is as follows: issuing a command of full charging of the management system and grid-connected charging of the energy storage converter; the management system receives the command and then fully charges; the energy storage converter receives the command and then is subjected to grid-connected charging until the lithium iron phosphate battery is charged, namely the lithium iron phosphate battery is full, and the energy storage converter enters a standby state again; and the management system is used for measuring the upper limit capacity and the charge capacity of the lithium iron phosphate battery to be 100%.
The charging method comprises a pre-charging stage, a constant-current charging stage, a first constant-voltage charging stage, an equalizing charging stage and a second constant-voltage charging stage, wherein in the pre-charging stage, the state of each single battery in the lithium iron phosphate battery is detected, if the voltage of at least one single battery in the lithium iron phosphate battery is lower than a pre-charging voltage threshold value, the lithium iron phosphate battery is pre-charged by a charger until all the single batteries lower than the pre-charging voltage threshold value are charged to be higher than the pre-charging voltage threshold value; in the constant current charging stage, a charging machine is used for charging the lithium iron phosphate battery at a constant current until the lithium iron phosphate battery is charged to a set constant voltage value; in a first constant voltage charging stage, charging the lithium iron phosphate battery at a first constant voltage by using a charger until the lithium iron phosphate battery is charged to a set first constant voltage value; in the equalizing charge stage, judging whether the difference value between the highest voltage and the lowest voltage of the single batteries in the lithium iron phosphate batteries exceeds an equalizing pressure difference threshold value, and if so, carrying out energy transfer type equalizing charge until the voltage difference of each single battery is controlled within the equalizing pressure difference threshold value range; and in the second constant voltage charging stage, the charging machine is used for charging the lithium iron phosphate battery at a second constant voltage until the set second constant voltage value is reached.
Preferably, during the constant current charging phase, the method further comprises: when the voltage of the single battery exceeds the protection upper limit value, the charging machine stops constant-current charging, skips over the first constant-voltage charging stage and enters an equalizing charging stage in advance.
The lithium iron phosphate battery charging method also comprises a capacity expansion method, wherein the capacity expansion method is used for acquiring the charging or discharging current of the first lithium iron phosphate battery pack; the first lithium iron phosphate battery pack and the second lithium iron phosphate battery pack are connected in parallel, and the internal resistance of the first lithium iron phosphate battery pack is smaller than that of the second lithium iron phosphate battery pack; triggering the first switching device to be switched on or switched off according to the current so as to adjust the resistance value of the variable resistance unit; the resistance-variable unit is connected with the first lithium iron phosphate battery pack in series and is provided with a first switching device and a first resistor which are connected in parallel.
Preferably, triggering the first switching device to turn on or off according to the current to adjust the resistance value of the variable resistance unit includes: judging whether the current is greater than or equal to a preset current value; and when the current is greater than or equal to the preset current value, triggering the first switch to be switched off so as to increase the resistance of the variable resistance unit.
The invention has the beneficial effects that: the invention relates to a charge capacity measuring method, which is used for automatically measuring the capacity and the charge capacity of a battery system by matching with a monitoring system and an energy storage converter. The safety and the reliability of the lithium iron phosphate battery are improved, the service life of the lithium iron phosphate battery is effectively prolonged, the measurement precision of the charge capacity of the lithium iron phosphate battery is greatly improved, the energy storage service efficiency of the lithium iron phosphate battery is improved, the use safety of the lithium iron phosphate battery in a large-scale energy storage power station is ensured, the short plate effect and the process difference of the lithium iron phosphate battery when the lithium iron phosphate battery is used in a group series connection mode can be overcome, the service life of the lithium iron phosphate battery is effectively prolonged, and the lithium iron.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
Fig. 1 is a flow chart of a method for measuring the charge capacity of a lithium iron phosphate battery according to the present invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
As shown in fig. 1, a method for measuring the charge capacity of a lithium iron phosphate battery comprises the following steps: (1) the energy storage converter enters a standby state; (2) starting the management system and the monitoring system; (3) the monitoring system detects whether the battery system management unit receives an alarm signal, and if not, the state is reset and the detection is carried out again; if yes, entering the step (4); (4) the management system is used for measuring the lower limit capacity and the charge capacity of the lithium iron phosphate battery to be 0%; (5) the management system is used for measuring the upper limit capacity and the charge capacity of the lithium iron phosphate battery to be 100%; (6) and (5) repeating the step (4) once, finishing the capacity check and the charge capacity measurement of the lithium iron phosphate battery by the management system, finishing the whole charging and discharging process, and counting the charging and discharging efficiency of the management system.
Further, the specific process of step (4) in the determination method is as follows: issuing commands of full discharge of the management system and grid-connected discharge of the energy storage converter; the management system receives the command and then carries out full discharge; the energy storage converter receives the command and then performs grid-connected discharge until the lithium iron phosphate battery finishes discharging, namely the lithium iron phosphate battery is emptied, and the energy storage converter enters a standby state again; and the management system is used for measuring the lower limit capacity and the charge capacity of the lithium iron phosphate battery to be 0%.
Further, the specific process of step (5) in the charge capacity measuring method is as follows: issuing a command of full charging of the management system and grid-connected charging of the energy storage converter; the management system receives the command and then fully charges; the energy storage converter receives the command and then is subjected to grid-connected charging until the lithium iron phosphate battery is charged, namely the lithium iron phosphate battery is full, and the energy storage converter enters a standby state again; and the management system is used for measuring the upper limit capacity and the charge capacity of the lithium iron phosphate battery to be 100%.
The charging method comprises a pre-charging stage, a constant-current charging stage, a first constant-voltage charging stage, an equalizing charging stage and a second constant-voltage charging stage, wherein in the pre-charging stage, the state of each single battery in the lithium iron phosphate battery is detected, if the voltage of at least one single battery in the lithium iron phosphate battery is lower than a pre-charging voltage threshold value, the lithium iron phosphate battery is pre-charged by a charger until all the single batteries lower than the pre-charging voltage threshold value are charged to be higher than the pre-charging voltage threshold value; in the constant current charging stage, a charging machine is used for charging the lithium iron phosphate battery at a constant current until the lithium iron phosphate battery is charged to a set constant voltage value; in a first constant voltage charging stage, charging the lithium iron phosphate battery at a first constant voltage by using a charger until the lithium iron phosphate battery is charged to a set first constant voltage value; in the equalizing charge stage, judging whether the difference value between the highest voltage and the lowest voltage of the single batteries in the lithium iron phosphate batteries exceeds an equalizing pressure difference threshold value, and if so, carrying out energy transfer type equalizing charge until the voltage difference of each single battery is controlled within the equalizing pressure difference threshold value range; and in the second constant voltage charging stage, the charging machine is used for charging the lithium iron phosphate battery at a second constant voltage until the set second constant voltage value is reached.
Further, in the constant current charging stage, the method further includes: when the voltage of the single battery exceeds the protection upper limit value, the charging machine stops constant-current charging, skips over the first constant-voltage charging stage and enters an equalizing charging stage in advance.
The lithium iron phosphate battery charging method also comprises a capacity expansion method, wherein the capacity expansion method is used for acquiring the charging or discharging current of the first lithium iron phosphate battery pack; the first lithium iron phosphate battery pack and the second lithium iron phosphate battery pack are connected in parallel, and the internal resistance of the first lithium iron phosphate battery pack is smaller than that of the second lithium iron phosphate battery pack; triggering the first switching device to be switched on or switched off according to the current so as to adjust the resistance value of the variable resistance unit; the resistance-variable unit is connected with the first lithium iron phosphate battery pack in series and is provided with a first switching device and a first resistor which are connected in parallel.
Further, triggering the first switching device to turn on or off according to the current to adjust the resistance of the varistor unit, including: judging whether the current is greater than or equal to a preset current value; and when the current is greater than or equal to the preset current value, triggering the first switch to be switched off so as to increase the resistance of the variable resistance unit.
The invention has the beneficial effects that: the invention relates to a charge capacity measuring method, which is used for automatically measuring the capacity and the charge capacity of a battery system by matching with a monitoring system and an energy storage converter. The safety and the reliability of the lithium iron phosphate battery are improved, the service life of the lithium iron phosphate battery is effectively prolonged, the measurement precision of the charge capacity of the lithium iron phosphate battery is greatly improved, the energy storage service efficiency of the lithium iron phosphate battery is improved, the use safety of the lithium iron phosphate battery in a large-scale energy storage power station is ensured, the short plate effect and the process difference of the lithium iron phosphate battery when the lithium iron phosphate battery is used in a group series connection mode can be overcome, the service life of the lithium iron phosphate battery is effectively prolonged, and the lithium iron.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (7)
1. The method for measuring the charge capacity of the lithium iron phosphate battery is characterized by comprising the following steps: the charge capacity measuring method comprises the following steps:
(1) the energy storage converter enters a standby state;
(2) starting a management system and a monitoring system;
(3) the monitoring system detects whether the battery system management unit receives the alarm signal, and if not, the state is reset and the detection is carried out again; if yes, entering the step (4);
(4) the management system completes the measurement of 0% of the lower limit capacity and the charge capacity of the lithium iron phosphate battery;
(5) the management system completes the measurement of 100% of the upper limit capacity and the charge capacity of the lithium iron phosphate battery;
(6) and (5) repeating the step (4) once, finishing the capacity check and the charge capacity measurement of the lithium iron phosphate battery by the management system, finishing the whole charging and discharging process, and counting the charging and discharging efficiency of the management system.
2. The method for measuring the charge capacity of a lithium iron phosphate battery according to claim 1, wherein: the specific process of the step (4) in the determination method is as follows: issuing commands of full discharge of the management system and grid-connected discharge of the energy storage converter; the management system receives the command and then carries out full discharge; the energy storage converter receives the command and then performs grid-connected discharge until the lithium iron phosphate battery finishes discharging, namely the lithium iron phosphate battery is emptied, and the energy storage converter enters a standby state again; and the management system is used for measuring the lower limit capacity and the charge capacity of the lithium iron phosphate battery to be 0%.
3. The method for measuring the charge capacity of a lithium iron phosphate battery according to claim 1, wherein: the specific process of the step (5) in the charge capacity measuring method is as follows: issuing a command of full charging of the management system and grid-connected charging of the energy storage converter; the management system receives the command and then fully charges; the energy storage converter receives the command and then is subjected to grid-connected charging until the lithium iron phosphate battery is charged, namely the lithium iron phosphate battery is full, and the energy storage converter enters a standby state again; and the management system is used for measuring the upper limit capacity and the charge capacity of the lithium iron phosphate battery to be 100%.
4. The lithium iron phosphate battery charging method is characterized by comprising the following steps: the charging method comprises a pre-charging stage, a constant-current charging stage, a first constant-voltage charging stage, an equalizing charging stage and a second constant-voltage charging stage, wherein in the pre-charging stage, the state of each single battery in the lithium iron phosphate battery is detected, if the voltage of at least one single battery in the lithium iron phosphate battery is lower than a pre-charging voltage threshold value, the lithium iron phosphate battery is pre-charged by a charger until all the single batteries lower than the pre-charging voltage threshold value are charged to be higher than the pre-charging voltage threshold value; in the constant current charging stage, a charging machine is used for charging the lithium iron phosphate battery at a constant current until the lithium iron phosphate battery is charged to a set constant voltage value; in a first constant voltage charging stage, charging the lithium iron phosphate battery at a first constant voltage by using a charger until the lithium iron phosphate battery is charged to a set first constant voltage value; in the equalizing charge stage, judging whether the difference value between the highest voltage and the lowest voltage of the single batteries in the lithium iron phosphate batteries exceeds an equalizing pressure difference threshold value, and if so, carrying out energy transfer type equalizing charge until the voltage difference of each single battery is controlled within the equalizing pressure difference threshold value range; and in the second constant voltage charging stage, the charging machine is used for charging the lithium iron phosphate battery at a second constant voltage until the set second constant voltage value is reached.
5. The method for charging a lithium iron phosphate battery according to claim 4, wherein: in the constant current charging stage, the method further comprises the following steps: when the voltage of the single battery exceeds the protection upper limit value, the charging machine stops constant-current charging, skips over the first constant-voltage charging stage and enters an equalizing charging stage in advance.
6. The lithium iron phosphate battery charging method is characterized by comprising the following steps: the capacity expansion method is used for obtaining the charging or discharging current of the first lithium iron phosphate battery pack; the first lithium iron phosphate battery pack and the second lithium iron phosphate battery pack are connected in parallel, and the internal resistance of the first lithium iron phosphate battery pack is smaller than that of the second lithium iron phosphate battery pack; triggering the first switching device to be switched on or switched off according to the current so as to adjust the resistance value of the variable resistance unit; the resistance-variable unit is connected with the first lithium iron phosphate battery pack in series and is provided with a first switching device and a first resistor which are connected in parallel.
7. The method for charging a lithium iron phosphate battery according to claim 6, wherein: triggering the first switch device to be turned on or off according to the current so as to adjust the resistance value of the variable resistance unit, and the method comprises the following steps: judging whether the current is greater than or equal to a preset current value; and when the current is greater than or equal to the preset current value, triggering the first switch to be switched off so as to increase the resistance of the variable resistance unit.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112531863A (en) * | 2020-10-23 | 2021-03-19 | 国网浙江省电力有限公司丽水供电公司 | Direct current power supply method and device for high mountain communication station |
| CN113489082A (en) * | 2021-05-31 | 2021-10-08 | 上海航天电源技术有限责任公司 | Lithium battery pack charging method and system |
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| CN109586367A (en) * | 2018-12-03 | 2019-04-05 | 浙江大学昆山创新中心 | A kind of charging method for ferric phosphate lithium cell |
| CN109802189A (en) * | 2019-03-26 | 2019-05-24 | 成都众希新能源科技有限公司 | The capacity-enlarging system and expansion method of ferric phosphate lithium cell packet |
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2020
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105990857A (en) * | 2015-01-29 | 2016-10-05 | 国家电网公司 | Phosphoric acid iron lithium battery management system and system on chip (SOC) calibration method |
| CN109586367A (en) * | 2018-12-03 | 2019-04-05 | 浙江大学昆山创新中心 | A kind of charging method for ferric phosphate lithium cell |
| CN109802189A (en) * | 2019-03-26 | 2019-05-24 | 成都众希新能源科技有限公司 | The capacity-enlarging system and expansion method of ferric phosphate lithium cell packet |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112531863A (en) * | 2020-10-23 | 2021-03-19 | 国网浙江省电力有限公司丽水供电公司 | Direct current power supply method and device for high mountain communication station |
| CN113489082A (en) * | 2021-05-31 | 2021-10-08 | 上海航天电源技术有限责任公司 | Lithium battery pack charging method and system |
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Application publication date: 20201013 |