CN113253134A - Portable electric energy system and measuring method thereof - Google Patents
Portable electric energy system and measuring method thereof Download PDFInfo
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- CN113253134A CN113253134A CN202110386527.2A CN202110386527A CN113253134A CN 113253134 A CN113253134 A CN 113253134A CN 202110386527 A CN202110386527 A CN 202110386527A CN 113253134 A CN113253134 A CN 113253134A
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000000691 measurement method Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 description 19
- 238000001514 detection method Methods 0.000 description 16
- 230000001276 controlling effect Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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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
-
- 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
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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
- H02J7/0013—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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
- H02J7/007186—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage obtained with the battery disconnected from the charge or discharge circuit
-
- 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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a portable electric energy system and a measuring method thereof, wherein the method comprises the following steps: acquiring the total capacity and the initial electric quantity percentage of each battery pack; detecting discharge current and discharge time of each battery pack; calculating the discharge electric quantity of each battery pack; calculating the residual electric quantity of each current battery pack, wherein the residual electric quantity of each battery pack is equal to the product of the total capacity of each battery pack and the percentage of the initial electric quantity minus the discharge electric quantity; calculating the real-time electric quantity percentage of each current battery pack; acquiring the open-circuit voltage of a battery pack and the real-time internal resistance of a battery cell unit in the battery pack; and calculating the residual electric quantity of each current battery pack to calculate the residual electric quantity of the portable electric energy system, wherein the residual electric quantity of the portable electric energy system is equal to the sum of the residual electric quantities of the battery packs connected to the power supply device. The method can reduce the calculation error of the residual electric quantity and improve the utilization rate of the battery.
Description
Technical Field
The invention relates to a portable electric energy system, in particular to a portable electric energy system capable of outputting alternating current and a method for measuring residual electric quantity thereof.
Background
With the development of battery technology, electric tools are gradually replacing engine tools. In order to achieve an operational effect and a cruising time similar to the engine operation, the rated power and the capacity of the battery pack are also increased more and more.
When the outdoor electric vehicle is used for work and travel, an alternating current power supply is often needed to supply power to some electric tools or facilities; the conventional portable power source is usually powered by the core pack therein, and once the power of the core pack of the power source is consumed, the power source cannot continuously supply alternating current.
Disclosure of Invention
In order to achieve the above object, the present invention adopts the following technical solutions:
a measurement method for a portable power system including a plurality of battery packs detachably connected to a power supply device, the measurement method comprising the steps of: acquiring the total capacity and the initial electric quantity percentage of each battery pack; detecting discharge current and discharge time of each battery pack; calculating the discharge electric quantity of each battery pack, wherein the discharge electric quantity of each battery pack is equal to the integral of the discharge current and the discharge time of each battery pack; calculating the initial residual electric quantity of each current battery pack, wherein the initial residual electric quantity of each battery pack is equal to the product of the total capacity of each battery pack and the percentage of the initial electric quantity minus the discharge electric quantity; calculating the real-time electric quantity percentage of each current battery pack, wherein the real-time electric quantity percentage is equal to the remaining electric quantity of the battery pack divided by the total capacity of the battery pack; acquiring the open-circuit voltage of a battery pack and the real-time internal resistance of a battery cell unit in the battery pack; calculating the residual electric quantity of each current battery pack, wherein the residual electric quantity is equal to the ratio of the difference between the open-circuit voltage and the discharge cut-off voltage of the battery pack to the real-time internal resistance of the battery cell unit; and calculating the residual capacity of the portable electric energy system, wherein the residual capacity of the portable electric energy system is equal to the sum of the residual capacities of the battery packs connected to the power supply device.
Further, the open-circuit voltage of the battery pack is calculated according to the electric quantity percentage curve of the battery pack.
And further, calculating the real-time internal resistance of the cell unit according to the cell internal resistance table of the battery pack.
Further, the measuring method further comprises the following steps: reading ID information of an accessed battery pack; judging whether the ID information of the battery pack is stored in the power supply device; if the ID information of the battery pack is stored in the power supply device, the total capacity of the battery pack is read. The measuring method according to claim 1,
the measuring method further comprises the following steps: and calculating the residual discharge time of the portable electric energy system, wherein the residual discharge time of the portable electric energy system is equal to the residual electric quantity of the portable electric energy system divided by the discharge current of the portable electric energy system, and the discharge current of the portable electric energy system is equal to the sum of the discharge currents of the battery packs.
Further, the method also comprises the following steps: judging whether the accessed battery pack is in a charging state; if the accessed battery pack is in a charging state, the following steps are carried out: reading the voltage of the lowest single-section battery cell of the battery pack; and calibrating the initial electric quantity percentage of the battery pack according to the voltage of the lowest single battery cell of the battery pack.
Further, calibrating the initial electric quantity percentage of the battery pack according to the voltage and electric quantity percentage curve of the lowest single-section battery cell of the battery pack.
A portable electrical energy system comprising: a battery pack capable of at least powering the power tool; the power supply device is used for enabling the battery pack to output electric energy or input the electric energy to the battery pack; the power supply device includes: the battery pack interface is used for accessing a battery pack; a BMS control module configured to: acquiring the total capacity and the initial electric quantity percentage of each battery pack; detecting discharge current and discharge time of each battery pack; calculating the discharge electric quantity of each battery pack, wherein the discharge electric quantity of each battery pack is equal to the integral of the discharge current and the discharge time of each battery pack; calculating the residual electric quantity of each current battery pack, wherein the residual electric quantity of each battery pack is equal to the product of the total capacity of each battery pack and the percentage of the initial electric quantity minus the discharge electric quantity; calculating the real-time electric quantity percentage of each current battery pack, wherein the real-time electric quantity percentage is equal to the remaining electric quantity of the battery pack divided by the total capacity of the battery pack; acquiring the open-circuit voltage of a battery pack and the real-time internal resistance of a battery cell unit in the battery pack; calculating the residual electric quantity of each current battery pack, wherein the residual electric quantity is equal to the ratio of the difference between the open-circuit voltage and the discharge cut-off voltage of the battery pack to the real-time internal resistance of the battery cell unit; and calculating the residual capacity of the portable electric energy system, wherein the residual capacity of the portable electric energy system is equal to the sum of the residual capacities of the battery packs connected to the power supply device.
Further, the BMS control module is configured to: and calculating the open-circuit voltage of the battery pack according to the electric quantity percentage curve of the battery pack.
Further, the BMS control module is configured to: and calculating the real-time internal resistance of the cell unit according to the cell internal resistance table of the battery pack.
Drawings
Fig. 1 is a perspective structural view of a portable electric energy system as one embodiment;
fig. 2 is a block diagram of the portable power system of fig. 1 with the battery pack and the power supply unit separated;
fig. 3 is an internal structural view of a power supply apparatus in the portable electric power system shown in fig. 1;
fig. 4 is a circuit block diagram of the portable power system of fig. 1;
FIG. 5 is a circuit diagram of the charging unit of FIG. 4;
fig. 6 is a charging flow chart for charging a battery pack in the portable electric energy system as one embodiment;
fig. 7 is a circuit diagram of a discharge cell as one of the embodiments;
FIG. 8 is a flow chart for calculating a remaining charge of a portable power system battery pack, as one embodiment;
FIG. 9 is a graph of percentage of charge in a battery pack versus open circuit voltage of the battery pack;
FIG. 10 is a flow chart for calibrating a total capacity of a battery pack, as one embodiment;
FIG. 11 is a circuit block diagram of a power supply apparatus including a power detection module of one embodiment;
FIG. 12 is a circuit block diagram of a power supply apparatus including a power detection module of another embodiment;
FIG. 13 is a flowchart of a method for fan throttling in a power supply unit, according to an embodiment;
FIG. 14 is a graph of the overall discharge efficiency of the power supply apparatus;
fig. 15 is a flowchart of a method for regulating fan speed in a power supply apparatus according to another embodiment;
fig. 16 is a flowchart of a method for regulating the speed of a fan in a power supply apparatus as another embodiment.
Detailed Description
The invention is described in detail below with reference to the figures and the embodiments.
Referring to fig. 1 to 4, the portable power supply system 100 includes a battery pack 110, a charger 120, and a power supply device 130. The power supply device 130(power device) includes a battery pack port 132(battery port) and a housing 131 (housing). A battery pack port 132 is provided on the housing 131 of the power supply device 130 for receiving (retrieving) the battery pack 110. Specifically, the housing 131 of the power supply device 130 is provided with a plurality of battery pack ports 132. In some embodiments (in the same entities), the number of the battery pack ports 132 is four (as shown in fig. 1), and in other embodiments, the number of the battery pack ports 132 is two or more. This is not particularly limited by the present application.
In some embodiments, the battery pack port 132 includes a positive terminal BAT +, a negative terminal BAT-, a signal terminal D, and a temperature terminal T, as shown in fig. 4. In other embodiments, the battery pack port 132 includes a positive terminal BAT +, a negative terminal BAT-, and a signal terminal D.
The power supply device 130 may be used to charge and/or discharge battery packs 110 having different types (differential types). For example, the battery pack 110 may be a lithium battery pack, a lithium-based battery pack, a solid-state battery pack, or a graphene battery pack. In some embodiments, the power supply device 130 can receive and/or discharge (is operable to receive and/or discharge) battery packs having different voltages, different capacities, different configurations (configurations), different shapes and sizes. For example, the power supply device 130 may charge or discharge a battery pack rated at 18V, 20V, 24V, 28V, 30V, 56V, greater than 56V, or the like. Alternatively, the power supply device 130 may charge or discharge a battery pack having a rated voltage in the above-described voltage range. The battery device can also charge or discharge a battery pack having a battery capacity of 1.2Ah, 1.3Ah, 1.4Ah, 2.0Ah, 2.4Ah, 2.6Ah, 3.0 Ah.
The charger 120 includes an AC power interface 121, a charger output interface 122, and an AC-DC conversion circuit 123, where the AC power interface 121 is connected to AC mains power, for example, 110V or 220V. The AC-DC conversion circuit 123 is configured to convert the accessed AC mains into DC power, and the charger output interface 122 outputs the DC power converted by the AC-DC conversion circuit 123. In some embodiments, the charger output interface 122 is electrically connected to the charging port 133 of the power supply device 130 through an external cable. In other embodiments, the charger output interface 122 is directly electrically connected to the charging port 133 of the power device 130, for example, electrically connected in a plug-in manner. In other embodiments, the charger 120 is disposed in the power device 130, and both the charger output interface 122 and the charging port 133 are disposed in the power device 130, and the charger output interface 122 and the charging port 133 are electrically connected through an internal wire. In some embodiments, the charger 120 includes two charger output interfaces 122, an AC-DC conversion circuit 123 in the charger 120 is used to convert AC power to DC power of, for example, +5V or +12V, one of the two charger output interfaces is used to output DC power of +5V or +12V, and the other of the charger output interfaces is connected directly or indirectly to a charging port 133 of the power supply apparatus 130.
Referring to the power supply apparatus 130 shown in fig. 2, the BMS module 140, the power supply module 150, the control module 160, the fan 170, the voltage dropping circuit 180, the voltage boosting circuit 190, and the inverter circuit 191 are further included in the housing 131.
The BMS module 140 includes software and hardware for controlling the power supply device 130, providing protection (e.g., over-voltage over-current protection) to the power supply device 130, controlling the charging current and charging voltage of the power supply device 130, receiving relevant information from the battery pack 110, monitoring the temperature of the battery pack 110, and the like. In some embodiments, the BMS module 140 includes a circuit board on which a plurality of electronic components that provide control and protection of the operation of the charger 120 are disposed. In some embodiments, the circuit board includes a control and processing unit such as a microprocessor, microcontroller, or other similar device. In some embodiments, the control module 160 includes a processing unit, a memory unit, and a bus. The bus connects the processing unit and the memory unit in the control module 160. Wherein the storage unit may be a ROM or a RAM. The control module 160 also includes input and output systems for communicating information from the various units in the control module 160 and between the control module 160 and other modules of the charger 120. The software includes control programs written to the microprocessor and microcontroller.
Specifically, the BMS module 140 is electrically connected to the battery pack port 132 for performing charge and discharge management of the battery pack 110. Specifically, the BMS module 140 includes a charging unit 141, a discharging unit 142, and a BMS control unit 143.
The power module 162 is electrically connected to the charging port 133, and is configured to convert the power input through the charging port into different power supply powers to supply power to the BMS module 140, the control module 160, and the display module in the charger, respectively.
The voltage dropping circuit 163 is electrically connected to the charging port 133, and is configured to drop the dc power with higher voltage input through the charging port, and then convert the dc power into dc power with lower voltage, such as +5V or +12V dc power. In some embodiments, the direct current having the lower voltage stepped down by the step-down circuit 163 is output through the USB interface, thereby enabling the power supply device to supply power to the USB interface device.
The boosting circuit 164 is electrically connected to the charging port 133, and is configured to boost the dc voltage input from the charging port to a dc voltage having a higher voltage, invert the dc voltage into an ac power through the inverter circuit 165, and output the ac power through the ac power output port 172, so that the power supply apparatus can supply power to the ac power device.
Referring to fig. 5, the charging unit 141 includes a charging port 133, an electronic switch 144, and an output port 145, wherein the charging port 133 is electrically connected to the charger output interface 122 for receiving a charging current from the charger 120. In some embodiments, the output port 145 is the battery pack port 132; in other embodiments, the output port 145 is electrically connected to the battery pack port 132. The electronic switch 144 includes two contact terminals a, b connected in series between the charging port 133 and the output port 145, and an enable terminal c. The enable terminal and BMS control unit 143 serves to receive a control signal from the BMS control unit 143 to control the on and off of the electronic switch 144. In some embodiments, the electronic switch 144 is a relay; in other embodiments, the electronic switch 144 is a power switch tube.
When the electronic switch 144 is turned on, the charging port 133 and the output port 145 are electrically connected to charge the charging unit 141 for the accessed battery pack 110; when the electronic switch 144 is turned off, the electrical connection between the charging port 133 and the output port 145 is disconnected, and the charging unit 141 cannot charge the accessed battery pack 110.
The charging logic of the charging unit 141 for charging the battery pack 110 is described below with reference to fig. 6. For convenience of description, the power supply device 130 is connected to 4 battery packs 110 as an example.
The four battery packs 110 are respectively inserted into the battery pack ports 132 of the power supply device 130, the BMS controlling unit 143 reads the remaining voltage of each battery pack 110, and sends a control signal to the battery pack 110 having the lowest voltage among the four battery packs 110 to charge the battery pack 110 to a preset voltage; the BMS controlling unit 143 further transmits a control signal to the battery pack 110 having the next lower voltage among the four battery packs 110 to charge the battery pack 110 to a preset voltage; the BMS controlling unit 143 simultaneously transmits a control signal to the four battery packs 110 to simultaneously charge the four battery packs 110 until the four battery packs 110 are fully charged and then are powered off.
Referring to fig. 6, a flow chart of a charging method for charging a plurality of battery packs is shown, the charging method includes the following steps, and for convenience of description, four battery packs are still exemplified here:
s601, detecting the voltage of each battery pack 110;
in some embodiments, the SOC chip detects the voltage of each battery pack accessed.
S602, comparing the voltage of each battery pack 110;
in some embodiments, the BMS control unit 143 is electrically connected to the SOC chip, receives the voltage of each battery pack 110 detected by the SOC chip, and compares the voltage of each battery pack 110 according to the voltage of each battery pack 110.
S603, charging the battery pack with the lowest voltage in the battery packs 110 to a first preset voltage; the value range of the first preset voltage is less than or equal to the voltage of the battery pack with the next lower voltage in each battery pack.
In some embodiments, the BMS controlling unit 143 outputs a single control signal to the battery pack having the lowest voltage among the battery packs to charge the battery pack having the lowest voltage among the battery packs to a first preset voltage, wherein the first preset voltage is the voltage of the battery pack having the next lowest voltage among the respective battery packs. Thus, after step S603 is completed, the voltage of the battery pack having the lowest voltage among the respective battery packs is equal to the voltage of the battery pack having the next lowest voltage among the battery packs.
S604, simultaneously charging the battery pack with the lowest voltage in the battery packs and the battery pack with the next lowest voltage in the battery packs to a third preset voltage; the value range of the third preset voltage is less than or equal to the voltage of the battery pack with the next highest voltage in each battery pack.
In some embodiments, the BMS controlling unit 143 outputs a control signal to the battery pack having the lowest voltage among the battery packs and the battery pack having the next lowest voltage among the battery packs such that the battery pack having the lowest voltage among the battery packs and the battery pack having the next lowest voltage among the battery packs are simultaneously charged to a third preset voltage, wherein the third preset voltage is the voltage of the battery pack having the next highest voltage among the respective battery packs. Thus, after step S604 is completed, the voltages of the two battery packs having the lowest voltage and the next lowest voltage among the respective battery packs are equal to the voltage of the battery pack having the next highest voltage among the battery packs. The third preset voltage is greater than the first preset voltage.
And S605, simultaneously charging each battery pack to a second preset voltage. The value range of the second preset voltage is larger than the third preset voltage and smaller than or equal to the full-charge voltage of the battery pack.
In some embodiments, the BMS controlling unit 143 outputs a control signal to the respective battery packs such that the respective battery packs are simultaneously charged to a second preset voltage, wherein the second preset voltage is a voltage of a battery pack having a minimum full charge voltage among the four battery packs.
The advantage of charging the battery packs connected to the power supply device 130 by using the above charging method is that it can be ensured that the charging voltage deviation of each battery pack connected is small, so that when the battery packs are required to be discharged to provide energy for the power consumption device, the power supply device can discharge rapidly after the battery packs are inserted into the power supply device, thereby improving the working efficiency of the power supply device.
Referring to fig. 7, the discharging unit 142 serves to cause the battery pack 110 to output power. The input end 146 of the discharging unit 142 is electrically connected to the battery pack port 132, and the output end 147 of the discharging unit 142 is electrically connected to the BMS control unit 143. The discharging unit 142 includes an SOC chip 148 that reads ID information of the battery pack 110 when the battery pack 110 is accessed to the battery pack port 132. The ID information of the battery pack includes information such as the total capacity of the battery pack, the type of the battery pack, the single cell voltage of the battery pack, the number of charge and discharge cycles, the percentage of the initial charge of the battery pack, the temperature of the battery pack, and the discharge cut-off voltage of the battery pack.
In some embodiments, the input terminal of the discharging unit 142 is the battery pack port 132 to electrically connect the battery pack terminal and the discharging unit 142. In other embodiments, the input terminal of the discharging unit 142 is electrically connected to the battery pack port 132 so as to electrically connect the terminal of the battery pack 110 to the discharging unit 142.
In some embodiments, since the voltages of the battery packs 110 connected to the respective battery pack ports 132 are different, the discharging unit 142 reads the voltages of the connected battery packs 110, and the BMS controlling unit 143 sends a control signal to the battery pack 110 having the highest voltage among the battery packs 110 to discharge it first until the voltages of the connected battery packs 110 are substantially the same, and then sends a control signal to the connected battery packs 110 to discharge the battery packs 110 in parallel.
The measurement method for the portable power system is illustrated with reference to fig. 8, wherein the portable power system includes a power supply device 130 and a plurality of battery packs 110 detachably connected to the power supply device 130. The measuring method comprises the following steps:
s801, acquiring the total capacity Qt and the initial electric quantity percentage SOC0 of each battery.
In some embodiments, the battery pack is connected to a battery pack interface of the power supply device, and the discharging unit reads ID information of each battery pack. Specifically, the SOC chip reads the total capacity and the initial charge percentage of each battery pack.
S802, detecting the discharge current If and the discharge time tf of each battery pack 110.
In some embodiments, the discharge unit 142 reads the discharge current and discharge time of each battery pack. Specifically, the discharge unit 142 includes a current detection circuit, such as a detection resistor or a current sensor, which is capable of detecting a discharge current of the battery pack. In some embodiments, the discharge unit 142 includes a timer for recording the discharge time of each battery pack. It is obvious that the timer can also be located in the power supply device as a separate clock module.
S803, calculating the discharging electric quantity Qf of each battery pack 110, wherein the discharging electric quantity of each battery pack 110 is equal to the integral of the discharging current and the discharging time of the battery pack 110, i.e. the integral
S804, calculating an initial remaining capacity Q0 of each battery pack 110, where the initial remaining capacity of the battery pack 110 is equal to the discharge capacity Qf subtracted by the product of the total capacity Qt of the battery pack 110 and the initial capacity percentage SOC0, i.e., Q0 is Qt · SOC 0-Qf.
In some embodiments, the discharging unit 142 includes a calculating subunit that calculates the discharging power amount and the remaining power amount of each battery pack 110. In other embodiments, the discharging unit 142 includes an SOC chip having a calculating unit for calculating the discharging capacity and the remaining capacity of each battery pack. In other embodiments, the BMS control unit 143 includes a calculation subunit that calculates the discharged power amount and the remaining power amount of each battery pack.
And S805, calculating the real-time electric quantity percentage SOC1 of each current battery pack, wherein the real-time electric quantity percentage is equal to the initial residual electric quantity Q0 of the battery pack divided by the total capacity Qt of the battery pack, namely the SOC1 is equal to Q0/Qt.
And S806, acquiring the open-circuit voltage Vk of each battery pack and the real-time internal resistance Rr of the battery cell unit in the battery pack.
In some embodiments, the open circuit voltage Vk of the battery pack 110 is calculated from a percentage of charge curve of the battery pack.
Referring to fig. 9, a graph of percentage of charge in a battery pack versus open circuit voltage of the battery pack is shown. The abscissa of the graph represents percentage of charge and the ordinate represents open circuit voltage of the battery pack. The open-circuit voltage of the battery pack is the voltage of the single cell with the lowest voltage in the battery pack. At the time of shipment of the battery pack, the open circuit voltage and the percentage charge curve of the battery pack 110 have been substantially determined.
In some embodiments, the power supply device 130 further comprises a storage module for storing a curve relating the percentage of charge in the battery pack to the open circuit voltage of the battery pack. Specifically, the storage module stores a data table in which the power percentage in the battery pack 110 corresponds to the open-circuit voltage of the battery pack 110, and after the real-time power percentage SOC1 of the battery pack is calculated in step S405, the BMS controlling unit 143 calls a relationship curve or relationship table in the storage module, which stores the power percentage in the battery pack and the open-circuit voltage of the battery pack, and searches the open-circuit voltage Vk of the corresponding battery pack according to the calculated real-time power percentage SOC1 of the battery pack to obtain the open-circuit voltage Vk of the battery pack. Therefore, the accurate open-circuit voltage Vk of the battery pack can be obtained according to the calculated real-time electric quantity percentage SOC1, and the measurement error of the open-circuit voltage Vk of the battery pack is reduced.
In some embodiments, the real-time internal resistance Rr of the cell unit is calculated according to the internal cell resistance table of the battery pack.
Referring to table 1 below, an exemplary cell internal resistance table of a battery pack is shown. The rows in the table represent temperature and the columns represent open circuit voltage of the battery pack. Specifically, the storage module further stores a battery core internal resistance meter of the battery pack. In some specific embodiments, the battery pack 110 includes a temperature detection circuit, which is configured to detect a temperature of the battery pack, and specifically, the temperature detection circuit detects a temperature of a battery cell in the battery pack 110. When the battery pack is inserted into the battery pack port 132, the temperature information of the battery pack is transmitted to the BMS control unit 143 through the terminal of the battery pack port 132, the BMS control unit 143 receives the temperature data of the battery pack and the open circuit voltage data corresponding to the battery pack, and the internal resistance table of the cell is searched according to the temperature data of the battery pack and the corresponding open circuit voltage data, so that the real-time internal resistance Rr of the cell unit is obtained.
TABLE 1
| T＝-20℃ | -16 | -12 | -8 | -4 | 0 | 4 | 8 | 12 | 16 | 20 | 24 | 28 | 32 | 36 | 40 | |
| VOC≤2.85V | 248 | 248 | 238 | 228 | 218 | 208 | 198 | 185 | 117 | 114 | 113 | 111 | 109 | 106 | 103 | 100 |
| 2.85V<VOC≤3V | 207 | 207 | 197 | 187 | 177 | 167 | 157 | 144 | 95 | 92 | 91 | 90 | 87 | 84 | 82 | 79 |
| 3V<VOC≤3.15 |
172 | 172 | 162 | 152 | 142 | 132 | 122 | 110 | 77 | 74 | 73 | 71 | 69 | 66 | 63 | 61 |
| 3.15V<VOC≤3.3 |
144 | 144 | 134 | 124 | 114 | 104 | 94 | 82 | 62 | 59 | 58 | 56 | 54 | 51 | 48 | 45 |
| 3.3V<VOC≤3.45 |
123 | 123 | 113 | 103 | 93 | 83 | 73 | 60 | 50 | 47 | 46 | 44 | 42 | 39 | 36 | 33 |
| 3.45V<VOC≤3.6V | 107 | 107 | 97 | 87 | 77 | 68 | 58 | 45 | 41 | 38 | 37 | 36 | 33 | 30 | 28 | 25 |
| 3.6V<VOC≤3.75V | 99 | 99 | 89 | 79 | 67 | 59 | 49 | 36 | 36 | 33 | 32 | 30 | 27 | 25 | 22 | 19 |
| 3.75V<VOC≤3.9V | 96 | 96 | 86 | 76 | 66 | 56 | 46 | 34 | 33 | 31 | 29 | 28 | 25 | 23 | 20 | 17 |
| 3.9V<VOC≤4.05 |
100 | 100 | 90 | 80 | 70 | 60 | 51 | 38 | 34 | 32 | 30 | 29 | 26 | 23 | 21 | 18 |
And S807, calculating the residual electric quantity Qs of each battery pack, wherein the residual electric quantity Qs is equal to the ratio of the difference between the open-circuit voltage Vk of the battery pack and the discharge cut-off voltage Vc of the battery pack to the real-time internal resistance Rr of the cell unit, and is (Vk-Vc)/Rr.
In some embodiments, the discharge cutoff voltage of the battery pack stored in the battery pack is transferred into the power supply device 130 through the signal terminal of the battery pack port 132 to be called by the BMS control module 160. In other embodiments, the power supply device 130 includes a storage module for storing ID information of the battery pack and a discharge cutoff voltage of the corresponding battery pack.
The residual electric quantity Qs of the battery pack is calculated through the calibrated open-circuit voltage Vk of the battery pack and the real-time internal resistance Rr of the battery cell unit, the measurement error of the residual electric quantity of the battery pack is reduced, and the accuracy of the residual electric quantity of the battery pack is improved.
And S808, calculating the residual electric quantity QS of the portable electric energy system, wherein the residual electric quantity QS of the portable electric energy system is equal to the sum of the residual electric quantities QS of all battery packs connected to the power supply device 130.
And S809, calculating the residual discharge time ts of the portable electric energy system, wherein the residual discharge time ts of the portable electric energy system is equal to the residual capacity QS of the portable electric energy system divided by the discharge current I of the portable electric energy system, namely ts is Qs/I. The discharge current I of the portable electric energy system is equal to the sum of the discharge currents If of the battery packs connected to the battery pack ports 132.
Therefore, the residual discharge time of the portable electric energy system is obtained, the error of the residual discharge time of the portable electric energy system is reduced, and the utilization efficiency of the electric energy of the battery pack can be improved.
In some embodiments, the BMS control module 160 calculates a remaining discharge time ts of the portable power system according to the remaining capacity QS and the discharge current I of the portable power system. In other embodiments, the power supply device further includes a display module for displaying the remaining power QS and the remaining discharge time ts of the portable power system for a user to read conveniently. Specifically, the display module is a display screen. In other embodiments, the power supply device of the portable power system includes a wireless communication module 161, which can communicate with a mobile terminal such as a mobile phone, and wirelessly transmit the remaining power QS and the remaining discharge time ts to a terminal interface for display.
When the battery pack 110 is accessed to the battery pack port 132, the BMS control module 160 is configured to determine whether the accessed battery pack 110 is in a charged state or a discharged state.
Referring to a flow chart of a measuring method for a portable electric energy system shown in fig. 10, the measuring method further includes the steps of:
and S101, respectively reading the voltage Vl of the lowest single-cell battery cell of the accessed battery pack.
S102, calibrating the initial electric quantity percentage SOC0 of the battery pack according to the voltage of the lowest single battery cell of the battery pack.
S103, judging whether the accessed battery pack is in a charging state; if the accessed battery pack is in a charging state, the step S104 is carried out; otherwise, go to step S801.
In some embodiments, whether the battery pack is in the charging state is determined by detecting whether a charging current is input. Specifically, the current of the charging port 133 is detected, and if the current flows into the charging port 133, it indicates that the battery pack is in a charging state.
S104, detecting the charging current Ic of each battery pack;
s105, judging whether the charging current is less than 0.1C or not, wherein C represents the nominal total capacity of the battery pack; if not, returning to the step S104; if yes, go to step S106.
S106, calculating the electric quantity delta Q charged into the battery pack, wherein the electric quantity delta Q charged into the battery pack is equal to the integral of the charging current Ic and the charging time t, namely
S107, judging whether the electric quantity charged into the battery pack is greater than or equal to 0.3 time of the total capacity Qt of the battery pack; if not, returning to step S106, if yes, executing step S108.
And S108, reading the lowest single-cell voltage of the battery pack.
And S109, calibrating the charged electric quantity percentage SOC1 by using the lowest single-cell voltage.
And S110, calibrating the total capacity Qt of the battery pack, wherein the Qt is delta Q/(SOC1-SOC 0).
In some embodiments, substituting the calibrated total capacity of the battery pack into step S401 may further improve the measurement accuracy of the remaining capacity of the portable power system.
The above steps may be performed by a software program written in the BMS control module 160.
Referring to fig. 11 and 12, the power supply device 130 further includes an electronic component, a fan 170, and a power detection module 171. The electronic components are located in the housing 131, and generate heat when the power supply device 130 operates. Specifically, the electronic component includes a circuit board located in the housing 131 and electronic components constituting each circuit.
The fan 170 rotates to generate an airflow within the housing 131 to dissipate heat from the electronic components. In some embodiments, the fan 170 is electrically connected to the BMS module 140 and receives a control signal from the BMS module 140 to adjust the rotation speed of the fan 170. In another embodiment, the fan 170 is electrically connected to the control module 160, for example, a control chip independent of the BMS control board, and receives a control signal from the control module 160 to adjust the rotation speed of the fan 170.
The power detection module 171 is used for detecting the input or output power of the power supply device 130. In some embodiments, the power detection module 171 is electrically connected to the battery pack port 132 of the power supply device 130 for detecting the input power of the power supply device. In other embodiments, the power detection module 171 is electrically connected to an ac output interface 172 of the power supply device, for example, an output interface for outputting ac power, for detecting the output power of the power supply device 130. In other embodiments, the power detection module 171 is electrically connected to the battery pack port 132 of the power supply device 130 and the output interface of the power supply device 130, respectively, and is used for detecting the input power and the output power of the power supply device 130. In some embodiments, the power detection module 171 includes a power chip and peripheral circuits electrically connected thereto. In another particular embodiment, the power detection module 171 includes a power detection circuit.
A method for adjusting the rotation speed of the fan according to the input or output power of the power supply device in the power supply device is described in detail below with reference to fig. 13, and the method includes the following steps:
s201, detecting the output power of the power supply device.
In some embodiments, the power detection module detects an output power of the power supply device.
S202, storing data related to the efficiency curve of the power supply device.
In some embodiments, the power supply apparatus further comprises a storage module that stores data related to the efficiency curve of the power supply apparatus 130.
Referring to fig. 14, a graph of the efficiency of the power supply apparatus is shown. In the figure, the abscissa represents the output power of the power supply device, and the ordinate represents the efficiency. The storage module stores the output power of the power supply device and the corresponding efficiency data.
S203. calculating the power loss Δ P of the power supply device 130 according to the output power Po of the power supply device and the data related to the efficiency curve of the power supply device.
In some embodiments, the control module calls the output power of the power supply device and the efficiency data corresponding to the output power stored in the storage module, searches for the corresponding efficiency η according to the output power Po, and then calculates to obtain the power loss Δ P of the power supply device 130 as Po/η -Po.
S204, judging whether the power loss delta P is increased, if so, executing a step S205; otherwise, step S206 is executed.
In some embodiments, the increase or decrease in power loss is judged by comparing the change in power loss at the time before and after. In another embodiment, the increase or decrease in power loss is determined by calculating the slope of the power loss.
And S205, increasing the rotating speed of the fan.
Specifically, the control module outputs a control signal for increasing the rotation speed of the fan to the fan when the power loss increases so as to increase the rotation speed of the fan, thereby increasing the airflow in the power supply device to increase the heat dissipation speed.
S206, reducing the rotating speed of the fan.
Specifically, the control module outputs a control signal for reducing the rotation speed of the fan to the fan when the power loss is reduced so as to reduce the rotation speed of the fan, thereby reducing the loss of electric energy.
The above-described manner may be performed by a software program written in the control module.
The rotating speed of the fan is adjusted by using the change of the power loss of the power supply device, a temperature detection unit is not required to be additionally arranged in the power supply device, and the heat dissipation efficiency of the power supply device is increased while the cost is reduced.
Referring to fig. 15, another method for regulating the speed of the fan 170 in the power device 130 is shown, which comprises the following steps:
s501, detecting input power Pi of the power supply device.
S502, storing data related to the efficiency curve of the power supply device.
Specifically, the storage module stores the input power Pi of the power supply device and the corresponding efficiency data η.
S503, obtaining power loss Δ P of the power supply device according to the input power Pi of the power supply device and data related to the efficiency curve of the power supply device, wherein Δ P is Pi · η.
S504, judging whether the power loss delta P is increased or not, and if so, executing a step S505; otherwise, step S506 is executed.
And S505, increasing the rotating speed of the fan.
S506, reducing the rotating speed of the fan.
The above-mentioned method can be executed by a software program written in the control module, and the difference from the method shown in fig. 13 is that the input power of the power supply apparatus is detected in step S501, and detailed description is omitted here.
Referring to fig. 16, another method for regulating the speed of a fan of a power supply device includes the following steps:
s601, detecting the input power Pi and the output power Po of the power supply device.
S602, obtaining a power loss Δ P of the power supply device according to the input power Pi and the output power Po of the power supply device, where Δ P is Po-Pi.
S603, judging whether the power loss delta P is increased, if so, executing the step S604; otherwise, step S605 is executed.
And S604, increasing the rotating speed of the fan.
And S605, reducing the rotating speed of the fan.
The above-mentioned manner can be executed by a software program written in the control module, and the difference from the method shown in fig. 14 is that the input power and the output power of the power supply device are detected in step S801, and detailed description is omitted here.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.
Claims (10)
1. A measurement method for a portable power system including a plurality of battery packs to which a power supply device is detachably connected, the measurement method comprising the steps of:
acquiring the total capacity and the initial electric quantity percentage of each battery pack;
detecting discharge current and discharge time of each battery pack;
calculating the discharge electric quantity of each battery pack, wherein the discharge electric quantity of each battery pack is equal to the integral of the discharge current and the discharge time of each battery pack;
calculating the initial residual capacity of each current battery pack, wherein the initial residual capacity of each current battery pack is equal to the product of the total capacity of each current battery pack and the percentage of the initial capacity of each current battery pack;
calculating the real-time electric quantity percentage of each current battery pack, wherein the real-time electric quantity percentage is equal to the remaining electric quantity of the battery pack divided by the total capacity of the battery pack;
acquiring the open-circuit voltage of the battery pack and the real-time internal resistance of a battery cell unit in the battery pack;
calculating the residual electric quantity of each current battery pack;
and calculating the residual capacity of the portable electric energy system, wherein the residual capacity of the portable electric energy system is equal to the sum of the residual capacities of the battery packs connected to the power supply device.
2. The measuring method according to claim 1,
and calculating the open-circuit voltage of the battery pack according to the electric quantity percentage curve of the battery pack.
3. The measuring method according to claim 1,
and calculating the real-time internal resistance of the battery cell unit according to the battery cell internal resistance table of the battery pack.
4. The measuring method according to claim 1,
the measuring method further comprises the following steps:
reading the ID information of the accessed battery pack;
judging whether the ID information of the battery pack is stored in the power supply device;
and if the ID information of the battery pack is stored in the power supply device, reading the total capacity of the battery pack.
5. The measuring method according to claim 1,
the measurement method further comprises:
and calculating the remaining discharge time of the portable electric energy system, wherein the remaining discharge time of the portable electric energy system is equal to the remaining capacity of the portable electric energy system divided by the discharge current of the portable electric energy system, and the discharge current of the portable electric energy system is equal to the sum of the discharge currents of the battery packs.
6. The measuring method according to claim 1,
also comprises the following steps:
judging whether the accessed battery pack is in a charging state or not;
if the accessed battery pack is in a charging state, the method comprises the following steps:
reading the voltage of the lowest single cell of the battery pack;
and calibrating the initial electric quantity percentage of the battery pack according to the voltage of the lowest single battery cell of the battery pack.
7. The measurement method according to claim 6,
and calibrating the initial electric quantity percentage of the battery pack according to the voltage and electric quantity percentage curve of the lowest single-section battery cell of the battery pack.
8. A portable electrical energy system comprising:
a battery pack capable of at least powering the power tool;
the power supply device is used for enabling the battery pack to output electric energy or input electric energy to the battery pack;
the power supply device includes:
a battery pack interface for accessing the battery pack;
a BMS control module configured to:
acquiring the total capacity and the initial electric quantity percentage of each battery pack;
detecting discharge current and discharge time of each battery pack;
calculating the discharge electric quantity of each battery pack, wherein the discharge electric quantity of each battery pack is equal to the integral of the discharge current and the discharge time of each battery pack;
calculating the remaining capacity of each current battery pack, wherein the remaining capacity of each current battery pack is equal to the product of the total capacity of each current battery pack and the initial capacity percentage;
calculating the real-time electric quantity percentage of each current battery pack, wherein the real-time electric quantity percentage is equal to the remaining electric quantity of the battery pack divided by the total capacity of the battery pack;
acquiring the open-circuit voltage of the battery pack and the real-time internal resistance of a battery cell unit in the battery pack;
calculating the residual electric quantity of each current battery pack;
and calculating the residual capacity of the portable electric energy system, wherein the residual capacity of the portable electric energy system is equal to the sum of the residual capacities of the battery packs connected to the power supply device.
9. The portable electrical energy system of claim 8,
the BMS control module is configured to:
and calculating the open-circuit voltage of the battery pack according to the electric quantity percentage curve of the battery pack.
10. The portable electrical energy system of claim 8,
the BMS control module is configured to:
and calculating the real-time internal resistance of the battery cell unit according to the battery cell internal resistance table of the battery pack.
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| CN202110386527.2A Pending CN113253134A (en) | 2017-12-08 | 2018-11-30 | Portable electric energy system and measuring method thereof |
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| KR102607997B1 (en) * | 2020-02-28 | 2023-12-01 | 동관 엠프렉스 테크놀로지 리미티드 | Battery pack management system, battery pack, vehicle and management method |
| CN111216593B (en) * | 2020-02-29 | 2021-09-24 | 张凯 | New energy vehicle, power supply control method and storage medium |
| CN111709003A (en) * | 2020-06-17 | 2020-09-25 | 深圳市绿谷能源科技有限公司 | Power cabinet management method and system of metal fuel electric pile and storage medium |
| CN113933717A (en) * | 2020-07-14 | 2022-01-14 | 北京小米移动软件有限公司 | Method and device for acquiring electric quantity of battery, battery and electronic equipment |
| CN111896878A (en) * | 2020-08-10 | 2020-11-06 | 陈永强 | On-line discrimination method for open-circuit batteries in battery pack |
| CN112964998B (en) * | 2021-02-02 | 2022-12-06 | 上海深湾能源科技有限公司 | Electric quantity display method, battery system and computer readable storage medium |
| WO2024174837A1 (en) * | 2023-02-24 | 2024-08-29 | 南京泉峰科技有限公司 | Silicon-carbon battery, battery pack, energy storage device, electric tool, and battery pack charger |
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