CN113702847A - Current parameter acquisition method suitable for energy storage battery pack - Google Patents
Current parameter acquisition method suitable for energy storage battery pack Download PDFInfo
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- CN113702847A CN113702847A CN202110976576.1A CN202110976576A CN113702847A CN 113702847 A CN113702847 A CN 113702847A CN 202110976576 A CN202110976576 A CN 202110976576A CN 113702847 A CN113702847 A CN 113702847A
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- current
- energy storage
- main control
- control unit
- discharge
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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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- 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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
Abstract
The invention discloses a current parameter acquisition method suitable for an energy storage battery pack, belongs to the technical field of storage battery detection, and aims to solve the problem that trickle charge current of a storage battery pack cannot be accurately measured in the prior art. It includes: the electronic switch of the discharge excitation unit is turned on, the energy storage element discharges, and the current generates voltage drop on the connecting bar; the main control unit acquires and acquires a discharging current value; the connecting bar voltage measuring circuit acquires voltage drops at two ends of the connecting bar, and the main control unit calculates and obtains the resistance of the connecting bar according to the discharging current value and the discharging voltage drop information; the electronic switch of the discharge excitation unit is closed; in the real-time detection process, the connecting bar voltage measuring circuit acquires real-time voltage drop at two ends of the connecting bar in real time and outputs the acquired real-time voltage drop information to the main control unit; and the main control unit calculates and obtains a real-time current value according to the real-time voltage drop information and the resistance of the connecting strip and the ohm law. The trickle charge current detection device is used for detecting the trickle charge current of the storage battery pack in real time.
Description
Technical Field
The invention relates to a current parameter acquisition method suitable for an energy storage battery pack, and belongs to the technical field of storage battery detection.
Background
With the development of big data, more and more power utilization places such as data centers for storing and processing data are used, and the following problems are that the requirements on power supply are higher after the places such as the data centers are officially operated, and the operating system must be ensured not to be powered off. This requires that a data center or the like is equipped with a backup power safeguard system such as a UPS (uninterruptible power supply) power supply system and a diesel generator system. The UPS is an important device for connecting a commercial power and a diesel generator set.
In a UPS power supply system, battery monitoring is particularly important, which requires a battery monitoring system, and for the battery monitoring system, it is particularly important for daily maintenance of the battery to constantly monitor the current state of the battery pack. The traditional battery pack current monitoring generally adopts a Hall type current sensor, the measuring range of the Hall current sensor is limited currently, the maximum resolution is usually only about 200mA, and the trickle charge current of the UPS battery pack usually falls in the range, so that the trickle charge current of the battery pack cannot be accurately measured under the common condition.
Disclosure of Invention
The invention aims to solve the problem that trickle charge current of a storage battery pack cannot be accurately measured in the prior art, and provides a current parameter acquisition method suitable for an energy storage battery pack.
The invention relates to a current parameter acquisition method suitable for an energy storage battery pack, which comprises the following steps:
during installation and debugging, energy is stored in an energy storage element in the discharge excitation unit;
the main control unit controls an electronic switch of the discharge excitation unit to be turned on, an energy storage element of the discharge excitation unit discharges, and current generates voltage drop on the connecting strip; meanwhile, the main control unit acquires and acquires the current value of the discharge;
the main control unit controls the connecting strip voltage measuring circuit to collect voltage drops at two ends of the connecting strip and outputs the obtained discharging voltage drop information to the main control unit;
the main control unit calculates and obtains the resistance of the connecting bar according to the ohm law according to the discharge current value and the discharge voltage drop information;
the main control unit controls the electronic switch of the discharge excitation unit to be closed, the energy storage unit of the discharge excitation unit stops discharging, and the energy storage element stores energy;
in the real-time detection process, the main control unit controls the connecting strip voltage measuring circuit to acquire real-time voltage drop at two ends of the connecting strip in real time and outputs the acquired real-time voltage drop information to the main control unit;
and the main control unit calculates and obtains a real-time current value according to the real-time voltage drop information and the resistance of the connecting strip and the ohm law.
Preferably, the connecting strip is arranged at the connecting position of any two batteries and is used for connecting and conducting the batteries.
Preferably, the connecting bar is a copper bar or a bus bar which can be replaced at will.
Preferably, two connecting lines are respectively arranged at two ends of the connecting strip;
the first connecting line at the left end and the first connecting line at the right end are connected with the discharge excitation unit to form a discharge loop;
the left second connecting line and the right second connecting line are connected with the connecting bar voltage measuring circuit, the voltage difference between the two ends of the connecting bar is measured, and the measuring result is sent to the main control unit.
Preferably, the discharge excitation unit adopts an electrolytic capacitor C2 as an energy storage unit to store energy required by discharge;
a fuse FU1 is adopted as a safety of a discharge loop;
the electronic switch HSM3107 is adopted to control the on-off of the discharge loop;
the resistor R10 is used as a current-limiting resistor, so that the maximum current in the discharging process is not beyond the safety limit;
the resistor RS1 is used as a collecting resistor of the discharge current, and the collection is carried out in a differential mode.
Preferably, the discharge excitation unit discharges the battery connecting bar in a manner that: and D, discharging the direct current.
Preferably, the connecting bar voltage measuring circuit adopts a programmable gain instrument amplifier AD8231 to realize accurate measurement of small current.
The invention has the advantages that: the invention relates to a current parameter acquisition method suitable for an energy storage battery pack. Then, in the detection process, the main control unit acquires the voltage drop at two ends of the connecting bar in real time, and then obtains a real-time current value according to the obtained resistance of the connecting bar and the ohm law. Because the internal resistance of the connecting bar is a value which does not change along with the change of time, the accurate measurement of the whole range can be realized.
Drawings
FIG. 1 is a schematic circuit diagram of a discharge driving unit according to the present invention;
FIG. 2 is a schematic diagram of the circuit configuration of the tie bar voltage measurement circuit of the present invention;
fig. 3 is a schematic diagram of a circuit structure of a single chip microcomputer STM8L051F3P6 adopted by the main control unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
The first embodiment is as follows: the following describes the present embodiment with reference to fig. 1 to fig. 3, where the present embodiment describes a current parameter collecting method suitable for an energy storage battery pack, and the method includes:
during installation and debugging, energy is stored in an energy storage element in the discharge excitation unit;
the main control unit controls an electronic switch of the discharge excitation unit to be turned on, an energy storage element of the discharge excitation unit discharges, and current generates voltage drop on the connecting strip; meanwhile, the main control unit acquires and acquires the current value of the discharge;
the main control unit controls the connecting strip voltage measuring circuit to collect voltage drops at two ends of the connecting strip and outputs the obtained discharging voltage drop information to the main control unit;
the main control unit calculates and obtains the resistance of the connecting bar according to the ohm law according to the discharge current value and the discharge voltage drop information;
the main control unit controls the electronic switch of the discharge excitation unit to be closed, the energy storage unit of the discharge excitation unit stops discharging, and the energy storage element stores energy;
in the real-time detection process, the main control unit controls the connecting strip voltage measuring circuit to acquire real-time voltage drop at two ends of the connecting strip in real time and outputs the acquired real-time voltage drop information to the main control unit;
and the main control unit calculates and obtains a real-time current value according to the real-time voltage drop information and the resistance of the connecting strip and the ohm law.
Furthermore, the connecting strip is arranged at the connecting position of any two batteries and used for connecting and conducting the batteries.
Still further, the connecting bar is a copper bar or a busbar which can be replaced at will.
Furthermore, two connecting lines are respectively arranged at two ends of the connecting strip;
the first connecting line at the left end and the first connecting line at the right end are connected with the discharge excitation unit to form a discharge loop;
the left second connecting line and the right second connecting line are connected with the connecting bar voltage measuring circuit, the voltage difference between the two ends of the connecting bar is measured, and the measuring result is sent to the main control unit.
The second embodiment is as follows: in the following description of the present embodiment with reference to fig. 1, the present embodiment further describes the first embodiment, in which the discharge excitation unit uses an electrolytic capacitor C2 as an energy storage unit to store energy required for discharge;
a fuse FU1 is adopted as a safety of a discharge loop;
the electronic switch HSM3107 is adopted to control the on-off of the discharge loop;
the resistor R10 is used as a current-limiting resistor, so that the maximum current in the discharging process is not beyond the safety limit;
the resistor RS1 is used as a collecting resistor of the discharge current, and the collection is carried out in a differential mode.
Further, the discharge excitation unit discharges the battery connecting bar in the following manner: and D, discharging the direct current.
In this embodiment, as shown in fig. 2, the discharge excitation unit includes an electronic switch HSM3107, resistors R1, R2, R4, R5, R8, R9, R10, R15, R17, RS1, a fuse FU1, an electrolytic capacitor C2, a capacitor C4, and a transistor Q2;
no. 1 pin, No. 2 pin and No. 3 pin of the electronic switch HSM3107 are connected with one end of a resistor R5 and one end of a fuse FU1 at the same time, the other end of the fuse FU1 is connected with one end of a resistor R1, the anode of an electrolytic capacitor C2 and one end of a resistor R2 at the same time, the cathode of the electrolytic capacitor is connected with one end of a resistor R4 and a digital DGND at the same time, the other end of the resistor R2 and the other end of the resistor R4 are connected with a direct current power supply Vc at the same time, the other end of the resistor R1 is connected with a direct current power supply Vin,
the No. 4 pin of the electronic switch HSM3107 is simultaneously connected with the other end of the resistor R5 and the collector of the triode Q2, the emitter of the triode Q2 is simultaneously connected with one end of the resistor R9, one end of the capacitor C4 and digital DGND, the other end of the capacitor C4 is a DGND2 port, the base of the triode Q2 is simultaneously connected with the other end of the resistor R9 and one end of the resistor R8, the other end of the resistor R8 is a T1 terminal and is connected with the No. 20 pin of the single chip microcomputer STM8L051F3P6,
the No. 5 pin, the No. 6 pin, the No. 7 pin and the No. 8 pin of the electronic switch HSM3107 are simultaneously connected with one end of a resistor R10, the other end of the resistor R10 is connected with an IN +2 port of a bent pin socket J4 of the connecting bar voltage measuring circuit,
one end of a resistor RS1 is simultaneously connected with one end of a resistor R15 and digital DGND, the other end of the resistor RS1 is simultaneously connected with one end of a resistor R17 and a DGND2 port, the other end of the resistor R15 is used as a T3 terminal and is connected with a No. 12 pin of a single chip microcomputer STM8L051F3P6, the other end of the resistor R17 is used as a T4 terminal and is connected with a No. 13 pin of a single chip microcomputer STM8L051F3P 6;
the DGND2 port is connected with a second connecting line at the right end of the connecting strip;
and the IN +2 port is connected with a second connecting line at the left end of the connecting strip.
When a signal for turning on the electronic switch transmitted by the singlechip is received at the T1, the Q2 triode is driven to be turned on, and further the M1 is driven to be completely turned on to start discharging.
The third concrete implementation mode: the embodiment is described below with reference to fig. 2, and the embodiment further describes the first embodiment, in which the connecting bar voltage measurement circuit uses a programmable gain instrumentation amplifier AD8231 to realize accurate measurement of a small current.
4. In this embodiment, the connecting bar voltage measuring circuit includes a programmable gain instrumentation amplifier AD8231, a resistor R11, R13, R14, R16, R20, R22, R21, R24, a capacitor C6, C7, C8, C9, C11, C19, a CON4 pin J2, a CON4 pin J3, and a looper socket J4;
the No. 2 pin of the programmable gain instrument amplifier AD8231 is connected with one end of a resistor R21, one end of a capacitor C9 and one end of a capacitor C7, the other end of the capacitor C9 is connected with a digital DGND, and the other end of the resistor R21 is connected with a DGND0 port;
the No. 3 pin of the programmable gain instrument amplifier AD8231 is simultaneously connected with one end of a resistor R24, one end of a capacitor C19 and the other end of a capacitor C7, the other end of the resistor R24 is connected with an IN +1 port of a bent pin socket J4, and the other end of the capacitor C19 is connected with a digital DGND;
the pin 16 of the programmable gain instrumentation amplifier AD8231 is simultaneously connected with the pin 3 of the pin J2 of CON4 and one end of the resistor R14,
the other end of the resistor R11, the other end of the resistor R13 and the other end of the resistor R14 are simultaneously connected with a digital DGND, and the pin 1, the pin 2, the pin 3 and the pin 4 of the J3 of the CON4 are simultaneously connected with a 3.3V direct current power supply,
the 14 th pin of the programmable gain instrumentation amplifier AD8231 is connected with the 6 th pin of the singlechip STM8L051F3P6,
the No. 15 pin of the programmable gain instrumentation amplifier AD8231 is connected with the No. 10 pin of the singlechip STM8L051F3P6,
the 16 th pin of the programmable gain instrument amplifier AD8231 is connected with the 9 th pin of the singlechip STM8L051F3P6,
the No. 6 pin of the programmable gain instrument amplifier AD8231 is used as a T5 terminal and is connected with the No. 16 pin of the singlechip STM8L051F3P6,
the No. 8 pin of the programmable gain instrument amplifier AD8231 is used as a T2 terminal and is connected with the No. 15 pin of the singlechip STM8L051F3P6,
the No. 10 pin of the programmable gain instrument amplifier AD8231 serves as a T6 wiring terminal and is connected with the No. 17 pin of the single chip microcomputer STM8L051F3P 6;
the No. 1 pin of the bent pin socket J4 is an IN +2 port, the No. 3 pin is an IN +1 port, the No. 4 pin is a DGND2 port, and the No. 6 pin is a DGND0 port;
the DGND0 port is connected with a first connecting line at the right end of the connecting bar;
and the IN +1 port is connected with a first connecting line at the left end of the connecting strip.
The bent pin socket J4 is implemented using 5569-2 × 3P.
In this embodiment, the programmable gain instrumentation amplifier AD8231 can realize accurate measurement of small current and can meet the range requirement for large current. Because the magnification of this amplifier is able to programme, by singlechip control completely, when the singlechip detects the sampling voltage undersize, then can promote the magnification of this amplifier, and in the same way, the voltage that the singlechip was gathered is too big, then can reduce the magnification of this amplifier for the voltage that the singlechip sampling obtained is in reasonable scope all the time.
The operation of the present invention will be described with reference to fig. 1 to 3, in which the cells are connected to each other by the connection bars, and a voltage drop is generated while current flows through the connection bars. The main control unit outputs current and controls the discharge excitation unit to discharge. The energy storage element is arranged in the discharge excitation unit, the energy of the energy storage element is supplemented by a power supply, the energy storage element returns to the current sampling resistor in the device through the protective tube, the electronic switch, the current limiting resistor, the discharge lead and the connecting bar and then returns to the energy storage element, and therefore when the electronic switch is turned on, the energy storage element can generate current on the connecting bar through the loop and can generate voltage drop. At the moment, the voltage drop at the two ends of the connecting bar is collected by adopting a connecting bar voltage measuring circuit, and the resistance of the connecting bar is obtained by the main control unit according to the current and the voltage drop and the ohm law. And then, the main control unit acquires the voltage drop at the two ends of the connecting bar in real time, and then acquires a real-time current value according to the ohm law and the acquired resistance of the connecting bar.
In fig. 3, the single chip microcomputer adopts STM8L051F3P6, J1 is a program debugging and downloading port of the single chip microcomputer, and D4 and D5 are status indicator lamps.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (7)
1. A current parameter acquisition method suitable for an energy storage battery pack is characterized by comprising the following steps:
during installation and debugging, energy is stored in an energy storage element in the discharge excitation unit;
the main control unit controls an electronic switch of the discharge excitation unit to be turned on, an energy storage element of the discharge excitation unit discharges, and current generates voltage drop on the connecting strip; meanwhile, the main control unit acquires and acquires the current value of the discharge;
the main control unit controls the connecting strip voltage measuring circuit to collect voltage drops at two ends of the connecting strip and outputs the obtained discharging voltage drop information to the main control unit;
the main control unit calculates and obtains the resistance of the connecting bar according to the ohm law according to the discharge current value and the discharge voltage drop information;
the main control unit controls the electronic switch of the discharge excitation unit to be closed, the energy storage unit of the discharge excitation unit stops discharging, and the energy storage element stores energy;
in the real-time detection process, the main control unit controls the connecting strip voltage measuring circuit to acquire real-time voltage drop at two ends of the connecting strip in real time and outputs the acquired real-time voltage drop information to the main control unit;
and the main control unit calculates and obtains a real-time current value according to the real-time voltage drop information and the resistance of the connecting strip and the ohm law.
2. The method for collecting the current parameters of the energy storage battery pack according to claim 1, wherein the connecting strip is installed at the connection position of any two batteries and used for connecting and conducting the batteries.
3. The method for collecting current parameters of an energy storage battery pack according to claim 2, wherein the connecting bar is a copper bar or a bus bar that can be replaced at will.
4. The current parameter acquisition method suitable for the energy storage battery pack according to claim 2, wherein two connecting lines are respectively installed at two ends of the connecting bar;
the first connecting line at the left end and the first connecting line at the right end are connected with the discharge excitation unit to form a discharge loop;
the left second connecting line and the right second connecting line are connected with the connecting bar voltage measuring circuit, the voltage difference between the two ends of the connecting bar is measured, and the measuring result is sent to the main control unit.
5. The current parameter acquisition method suitable for the energy storage battery pack as claimed in claim 1, wherein the discharge excitation unit adopts an electrolytic capacitor C2 as an energy storage unit to store energy required by discharge;
a fuse FU1 is adopted as a safety of a discharge loop;
the electronic switch HSM3107 is adopted to control the on-off of the discharge loop;
the resistor R10 is used as a current-limiting resistor, so that the maximum current in the discharging process is not beyond the safety limit;
the resistor RS1 is used as a collecting resistor of the discharge current, and the collection is carried out in a differential mode.
6. The method for collecting current parameters of an energy storage battery pack according to claim 5, wherein the discharge excitation unit discharges the battery connecting strips in a manner that: and D, discharging the direct current.
7. The method for collecting the current parameters of the energy storage battery pack according to claim 1, wherein the connecting bar voltage measuring circuit adopts a programmable gain instrument amplifier AD8231 to realize the accurate measurement of the small current.
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| CN202110976576.1A CN113702847A (en) | 2021-08-24 | 2021-08-24 | Current parameter acquisition method suitable for energy storage battery pack |
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| CN202110976576.1A CN113702847A (en) | 2021-08-24 | 2021-08-24 | Current parameter acquisition method suitable for energy storage battery pack |
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2021
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| US20050021254A1 (en) * | 2003-07-25 | 2005-01-27 | James G. Biddle Co. | Method and apparatus for determining the complex impedance of an electrical component |
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Application publication date: 20211126 |