CN109901082A - Portable electric energy system and its measurement method - Google Patents
Portable electric energy system and its measurement method Download PDFInfo
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- CN109901082A CN109901082A CN201811453918.6A CN201811453918A CN109901082A CN 109901082 A CN109901082 A CN 109901082A CN 201811453918 A CN201811453918 A CN 201811453918A CN 109901082 A CN109901082 A CN 109901082A
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- battery pack
- battery
- remaining capacity
- electric energy
- energy system
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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 kind of portable electric energy system and its measurement methods, and this method comprises the following steps: obtaining the total capacity and initial quantity of electricity percentage of each battery pack；Detect discharge current and the discharge time of each battery pack；Calculate the discharge electricity amount of each battery pack；The remaining capacity of current each battery pack is calculated, the remaining capacity of battery pack is equal to the total capacity of battery pack and the product of initial quantity of electricity percentage subtracts discharge electricity amount；Calculate the real time electrical quantity percentage of current each battery pack；Obtain the real-time internal resistance of battery core unit in the open-circuit voltage and battery pack of battery pack；The remaining capacity for calculating current each battery pack calculates the remaining capacity of portable electric energy system, and the remaining capacity of portable electric energy system is equal to the sum of the remaining capacity of battery pack of access power supply device.This method can reduce the calculating error of remaining capacity, improve the utilization rate of battery.
Description
Technical field
The present invention relates to a kind of portable electric energy systems, and in particular to a kind of portable electric energy system that can export alternating current
And its measurement method of remaining capacity.
Background technique
With the development of battery technology, electric tool is gradually replacing engine tool.It is similar to engine work to realize
The working effect of work and cruise duration, the rated power and capacity of battery pack are also increasing.
It is worked and is traveled outdoors, AC power source is generally required to use electric tool or facility power to be some；Tradition
Portable power supply, often powered by its internal battery core group, can not if the power consumption of the battery core group of the power supply is complete
Alternating current is persistently provided.
Summary of the invention
In order to achieve the above objectives, the present invention adopts the following technical scheme that:
A kind of measurement method for portable electric energy system, portable electric energy system include power supply device and power supply device
The multiple battery packs being detachably connected, measurement method include the following steps: the total capacity and initial quantity of electricity that obtain each battery pack
Percentage；Detect discharge current and the discharge time of each battery pack；Calculate the discharge electricity amount of each battery pack, wherein battery
The discharge electricity amount of packet is equal to the discharge current and the integral of discharge time of battery pack；Calculate the initial residual of current each battery pack
Electricity, the initial residual electricity of battery pack is equal to the total capacity of battery pack and the product of initial quantity of electricity percentage subtracts discharge electricity amount；
The real time electrical quantity percentage of current each battery pack is calculated, real time electrical quantity percentage is equal to the remaining capacity of battery pack divided by battery
The total capacity of packet；Obtain the real-time internal resistance of battery core unit in the open-circuit voltage and battery pack of battery pack；Calculate current each battery
The remaining capacity of packet, remaining capacity are equal in the difference of the discharge cut-off voltage of open-circuit voltage and battery pack and the real-time of battery core unit
The ratio between resistance；The remaining capacity of portable electric energy system is calculated, the remaining capacity of portable electric energy system is equal to access power supply device
The sum of the remaining capacity of battery pack.
Further, the open-circuit voltage of battery pack is calculated according to the electricity percentage curve of battery pack.
Further, the real-time internal resistance of battery core unit is calculated according to the battery core internal resistance meter of battery pack.
Further, measurement method is further comprising the steps of: reading the id information of the battery pack of access；Judge the ID of battery pack
Whether information stores to power supply device；If the id information of battery pack is stored to power supply device, the total capacity of battery pack is read.Root
According to the measurement method of claim 1, which is characterized in that
Measurement method further include: calculate the socking out time of portable electric energy system, the residue of portable electric energy system is put
The electric time is equal to the remaining capacity of portable electric energy system divided by the discharge current of portable electric energy system, wherein portable electric
The discharge current of energy system is equal to the sum of each battery pack discharge current.
Further, further include following steps: judging whether the battery pack of access is in charged state；If the battery pack of access
In charged state, then: reading the voltage of the minimum single-unit battery core of battery pack；The voltage of minimum single-unit battery core according to battery pack
The initial quantity of electricity percentage of calibration battery packet.
Further, the voltage with electricity percentage curve calibration battery packet of the minimum single-unit battery core of foundation battery pack is initial
Electricity percentage.
A kind of portable electric energy system, comprising: battery pack can at least power for electric tool；Power supply device, for making electricity
Chi Bao exports electric energy or inputing power to battery pack；Power supply device includes: battery packet interface, for accessing battery pack；BMS control
Module is configured as: obtaining the total capacity and initial quantity of electricity percentage of each battery pack；Detect the discharge current of each battery pack
And discharge time；Calculate the discharge electricity amount of each battery pack, wherein the discharge electricity amount of battery pack is equal to the discharge current of battery pack
With the integral of discharge time；The remaining capacity of current each battery pack is calculated, the remaining capacity of battery pack is equal to the total of battery pack
The product of capacity and initial quantity of electricity percentage subtracts discharge electricity amount；The real time electrical quantity percentage of current each battery pack is calculated, in real time
Electricity percentage is equal to the remaining capacity of battery pack divided by the total capacity of battery pack；Obtain the open-circuit voltage and battery pack of battery pack
The real-time internal resistance of middle battery core unit；The remaining capacity of current each battery pack is calculated, remaining capacity is equal to open-circuit voltage and battery
The difference of the discharge cut-off voltage of packet and the ratio between the real-time internal resistance of battery core unit；The remaining capacity of portable electric energy system is calculated, just
The remaining capacity for taking formula electrical energy system is equal to the sum of the remaining capacity of battery pack of access power supply device.
Further, BMS control module is configured as: the open circuit of battery pack is calculated according to the electricity percentage curve of battery pack
Voltage.
Further, BMS control module is configured as: the battery core internal resistance meter according to battery pack calculates the real-time interior of battery core unit
Resistance.
Detailed description of the invention
Fig. 1 is the three-dimensional structure diagram of the portable electric energy system as one embodiment；
Fig. 2 is the structure chart of battery pack and power supply device separation in the portable electric energy system of Fig. 1；
Fig. 3 is the internal structure chart of power supply device in portable electric energy system shown in FIG. 1；
Fig. 4 is the circuit block diagram of the portable electric energy system of Fig. 1；
Fig. 5 is the circuit diagram of charhing unit in Fig. 4；
Fig. 6 is the charging flow figure to charge in the portable electric energy system as one embodiment to battery pack；
Fig. 7 is the circuit diagram of the discharge cell as one of embodiment；
Fig. 8 is the flow chart of the remaining capacity for calculating portable electric energy system battery packet as one of embodiment；
Fig. 9 is the relation curve of electricity percentage and battery pack open-circuit voltage in battery pack；
Figure 10 is the flow chart for calibration battery packet total capacity as one of embodiment；
Figure 11 is the circuit block diagram of the power supply device comprising power detection module of one embodiment；
Figure 12 is the circuit block diagram of the power supply device comprising power detection module of another embodiment；
Figure 13 is the method flow diagram for fan speed-regulating in power supply device as one embodiment；
Figure 14 is the complete machine discharging efficiency curve graph of power supply device；
Figure 15 is the method flow diagram for fan speed-regulating in power supply device as another embodiment；
Figure 16 is the method flow diagram for fan speed-regulating in power supply device as another embodiment.
Specific embodiment
Specific introduce is made to the present invention below in conjunction with the drawings and specific embodiments.
Referring to figs. 1 to portable power source system 100 shown in Fig. 4, including battery pack 110, charger 120 and power supply device
130.Wherein, power supply device 130 (power device) includes battery pack port 132 (battery port) and shell 131
(housing).Battery pack port 132 is arranged on the shell 131 of power supply device 130, for receiving (receving) battery pack
110.Specifically, the shell 131 of power supply device 130 is equipped with multiple battery pack ports 132.(in some in some embodiments
Embodiments), the number of battery pack port 132 is four (as shown in Figure 1), in further embodiments, battery pack port
132 number is two or more.The application is not specifically limited this.
In certain embodiments, battery pack port 132 includes positive terminal BAT+, negative terminal BAT-, signal end
Sub- D and temperature terminal T, as shown in Figure 4.In other specific embodiments, battery pack port 132 include positive terminal BAT+,
Negative terminal BAT- and signal terminal D.
Power supply device 130 can be used for for the battery pack 110 of different type (different types) charging and/or
Make that there is different types of battery pack to discharge.For example, battery pack 110 can for lithium battery pack, lithium-base battery packet, solid state battery packet or
Graphene battery packet.In some embodiments, power supply device 130 can receive simultaneously (is operable to receive and
Charge and/or discharge) it is with different voltages, different capabilities, different structure (configuration), difference
The battery pack of shape and size charges and/or these battery packs is made to discharge.For example, power supply device 130 can make voltage rating
18V, 20V, 24V, 28V, 30V, 56V, the battery pack charge or discharge greater than 56V etc..Alternatively, power supply device 130 can make it is specified
Battery pack charge or discharge of the voltage in above-mentioned voltage range.Cell apparatus can also make battery capacity 1.2Ah, 1.3Ah,
The battery pack charge or discharge of 1.4Ah, 2.0Ah, 2.4Ah, 2.6Ah, 3.0Ah.
Charger 120 includes exchange electrical interface 121, charger output interface 122 and AC-DC conversion circuit 123, alternating current
The access electric main of interface 121, such as 110V or 220V.The electric main conversion that AC-DC conversion circuit 123 is used to access
For direct current, charger output interface 122 exports the direct current converted through AC-DC conversion circuit 123.In some embodiments
In, charger output interface 122 is electrically connected by the charging port 133 of External cable and power supply device 130.In other realities
It applies in example, charger output interface 122 is directly electrically connected with the charging port 133 of power supply device 130, for example, to plug shape
Formula is electrically connected.In further embodiments, charger 120 is built in power supply device 130, at this time charger output interface 122
It is respectively positioned on inside power supply device 130 with charging port 133, passes through inside between charger output interface 122 and charging port 133
Conducting wire is electrically connected.In some embodiments, charger 120 includes two charger output interfaces 122, in charger 120
AC-DC conversion circuit 123 is used to convert alternating current to the direct current of such as+5V or+12V, in two charger output interfaces
One for exporting the direct current of+5V or+12V, the charging end of another in charger output interface with power supply device 130
133 direct or indirect connections of mouth.
With reference to power supply device 130 shown in Fig. 2, further include BMS module 140 in the shell 131, power module 150,
Control module 160, fan 170, reduction voltage circuit 180, booster circuit 190 and inverter circuit 191.
BMS module 140 includes software and hardware, for controlling power supply device 130, provides protection (example for power supply device 130
Such as over-voltage over-current protection), control related letter of the charging current of power supply device 130 to charging voltage, reception from battery pack 110
Breath, temperature of monitoring battery pack 110 etc..In some embodiments, BMS module 140 includes circuit board, is provided on circuit board more
It is a that the electronic component of control and the protection operation of charger 120 is provided.In some embodiments, circuit board includes control and processing
Unit such as microprocessor, microcontroller or other similar devices.In some embodiments, control module 160 includes that processing is single
Member, storage unit and bus.Processing unit and storage unit in bus link control module 160.Wherein, storage unit can be with
It is ROM or RAM.Control module 160 also includes input and input system, is used for transmission the information of each unit in control module 160
Information between control module 160 and the other modules of charger 120.Software includes the control that microprocessor and microcontroller is written
Processing procedure sequence.
Specifically, BMS module 140 and battery pack port 132 are electrically connected, for realizing the charge and discharge fulgurite of battery pack 110
Reason.Specifically, BMS module 140 includes charhing unit 141, discharge cell 142 and BMS control unit 143.
Power module 162 and charging port 133 are electrically connected, and the electric energy for inputting charged port is converted to difference
Power supply electric energy be respectively in BMS module 140, control module 160 and charger display module power supply.
Reduction voltage circuit 163 and charging port 133 are electrically connected, for by charged port input with high voltage
The direct current electricity output with lower voltage, such as+5V or+12V DC electricity are converted to after direct current decompression.In some embodiments
In, it is exported through the direct current with lower voltage that reduction voltage circuit 163 is depressured through USB interface, so that power supply device can
For the power supply of USB interface device.
Booster circuit 164 and charging port 133 are electrically connected, and the dc voltage boost for inputting charged port is extremely
After DC voltage with high voltage again via 165 inversion of inverter circuit be alternating current, it is defeated through alternating current output port 172
Out, so that power supply device can be exchange power device power supply.
With reference to charhing unit 141 shown in fig. 5, including charging port 133, electronic switch 144 and output port 145, fill
Electric port 133 is electrically connected with charger output interface 122 to access the charging current from charger 120.In some implementations
In example, output port 145 is battery pack port 132；In further embodiments, output port 145 and battery pack port 132
It is electrically connected.Electronic switch 144 includes two tip sides a, b and an enable end c, and two tip sides are connected on charging port
Between 133 and output port 145.Enable end and BMS control unit 143 are used to receive the control from BMS control unit 143 and believe
Number to control the turn-on and turn-off of electronic switch 144.In some embodiments, electronic switch 144 is relay；In other realities
It applies in example, electronic switch 144 is power switch tube.
When electronic switch 144 is connected, charging port 133 and output port 145 are established and are electrically connected so that charhing unit 141
It charges for the battery pack 110 of access；When electronic switch 144 disconnects, the electrical property between charging port 133 and output port 145 connects
It connects and is disconnected, charhing unit 141 can not charge at this time for the battery pack 110 of access.
Illustrate the recharge logic that charhing unit 141 charges to battery pack 110 below in conjunction with Fig. 6.For convenience of narration, here with
Power supply device 130 is illustrated for accessing 4 battery packs 110.
Four battery packs 110 are inserted into the battery pack port 132 of power supply device 130 respectively, and BMS control unit 143 is read respectively
The residual voltage of a battery pack 110, issue control signal into four battery packs 110 the minimum battery pack 110 of voltage so that should
Battery pack 110 charges to a predeterminated voltage；BMS control unit 143 issues control signal voltage into four battery packs 110 again
Secondary low battery pack 110 is so that the battery pack 110 charges to predeterminated voltage；BMS control unit 143 is simultaneously emitted by control signal again
It charges to four battery packs 110 to four battery packs 110, is powered off after four battery packs 110 reach and completely fill simultaneously.
With reference to the charging method flow chart shown in fig. 6 to charge for multiple battery packs, which includes following step
Suddenly, it for convenience of description, is still illustrated by taking four battery packs as an example here:
S601. the voltage of each battery pack 110 is detected；
In some embodiments, the voltage of each battery pack of SOC chip detection access.
S602. the voltage swing of more each battery pack 110；
In some embodiments, BMS control unit 143 and SOC chip are electrically connected, what reception was detected from SOC chip
The voltage of each battery pack 110, and the voltage swing of more each battery pack 110 of voltage according to each battery pack 110.
S603. the battery pack that voltage is minimum in battery pack 110 is made to charge to the first predeterminated voltage；Wherein, the first default electricity
The value range of pressure is the voltage of the battery pack low less than or equal to voltage in each battery pack time.
In some embodiments, BMS control unit 143 exports the minimum battery of single control signal voltage into battery pack
Packet is so that the minimum battery pack of voltage charges to the first predeterminated voltage in battery pack, wherein the first predeterminated voltage is each battery
The voltage of the low battery pack of voltage time in packet.In this way, after the completion of step S603, the minimum battery pack of voltage in each battery pack
Voltage be equal to the voltage of the battery pack that voltage is time low in battery pack.
S604. the battery pack that makes voltage in the battery pack and battery pack that voltage is minimum in battery pack time low while the is charged to
Three predeterminated voltages；Wherein, the value range of third predeterminated voltage is the battery pack high less than or equal to voltage in each battery pack time
Voltage.
In some embodiments, BMS control unit 143 outputs control signals to the minimum electricity of voltage in battery pack
The low battery pack of voltage time is so that voltage time is low in voltage minimum battery pack and battery pack in battery pack in Chi Bao and battery pack
Battery pack charge to third predeterminated voltage simultaneously, wherein third predeterminated voltage is the battery that voltage time is high in each battery pack
The voltage of packet.In this way, the electricity for two battery packs that voltage is minimum after the completion of step S604, in each battery pack and voltage time is low
Pressure is equal to the voltage for the battery pack that voltage time is high in battery pack.Third predeterminated voltage is greater than the first predeterminated voltage.
S605. the second predeterminated voltage is charged to simultaneously to each battery pack.Wherein, the value range of the second predeterminated voltage is
Greater than the full charge pressure that third predeterminated voltage is less than or equal to battery pack.
In some embodiments, BMS control unit 143 outputs control signals to each battery pack so that each battery pack
The second predeterminated voltage is charged to simultaneously, wherein the second predeterminated voltage is the electricity that full charge presses the smallest battery pack in four battery packs
Pressure.
It is using the advantage that above-mentioned charging method charges to the battery pack of access power supply device 130, it is ensured that access
Each battery pack charging voltage deviation it is smaller, in this way, when needing battery pack to discharge to provide energy for power device, electricity
Chi Bao be inserted into power supply device after, power supply device can repid discharge, to improve the working efficiency of power supply device.
Refering to what is shown in Fig. 7, discharge cell 142 is for making battery pack 110 export electric energy.The input terminal 146 of discharge cell 142
It is electrically connected with battery pack port 132, the output end 147 and BMS control unit 143 of discharge cell 142 are electrically connected.Electric discharge is single
Member 142 includes SOC chip 148, and the id information of battery pack 110 is read when battery pack 110 accesses battery pack port 132.Here
The id information of battery pack includes battery pack total capacity, the model of battery pack, battery pack single-unit battery core voltage, charge and discharge cycles number
With the information such as battery pack initial quantity of electricity percentage, battery pack temperature and battery pack discharge cut-off voltage.
In some specific embodiments, the input terminal of discharge cell 142 is battery pack port 132 so that battery pack end
Son is electrically connected with discharge cell 142.In other specific embodiments, the input terminal of discharge cell 142 and battery pack end
Mouth 132 is electrically connected so that 110 terminal of battery pack and discharge cell 142 are electrically connected.
In some embodiments, since the voltage for accessing the battery pack 110 of each battery pack port 132 is different, electric discharge
Unit 142 reads the voltage of each battery pack 110 of access, and BMS control unit 143 issues control signal into battery pack 110
The maximum battery pack 110 of voltage makes it first discharge, until when 110 voltage of each battery pack of access is essentially identical, then issue control
Signal processed is to each battery pack 110 accessed so that 110 parallel discharge of battery pack.
With reference to the measurement method shown in Fig. 8 for portable electric energy system, wherein portable electric energy system includes power supply
Device 130 and the multiple battery packs 110 being detachably connected with power supply device 130.The measurement method includes the following steps:
S801. the total capacity Qt and initial quantity of electricity percentage SOC0 of each battery are obtained.
In some embodiments, the battery packet interface of battery pack access power supply device, discharge cell read each battery pack
Id information.Specifically, SOC chip reads the total capacity and initial quantity of electricity percentage of each battery pack.
S802. the discharge current And if discharge time tf of each battery pack 110 are detected.
In some embodiments, discharge cell 142 reads discharge current and the discharge time of each battery pack.Specifically,
Discharge cell 142 includes current detection circuit, such as detection resistance or current sensor etc. are able to detect battery pack discharge current
Circuit.In some embodiments, discharge cell 142 includes timer, for recording the discharge time of each battery pack.It is aobvious
So, timer also can be used as individual clock module and be located in power supply device.
S803. the discharge electricity amount Qf of each battery pack 110 is calculated, wherein the discharge electricity amount of each battery pack 110 is equal to electricity
The discharge current and the integral of discharge time of pond packet 110, i.e.,
S804. the initial residual electricity Q0 of each battery pack 110 is calculated, the initial residual electricity of battery pack 110 is equal to electricity
The product of the total capacity Qt and initial quantity of electricity percentage SOC0 of pond packet 110 subtract discharge electricity amount Qf, i.e. Q0=QtSOC0-Qf.
In some embodiments, discharge cell 142 includes the discharge electricity amount and remaining capacity for calculating each battery pack 110
Computation subunit.It in further embodiments, include SOC chip in discharge cell 142, SOC chip, which has, calculates each battery
The computing unit of packet discharge electricity amount and remaining capacity.In further embodiments, BMS control unit 143 includes calculating each electricity
The discharge electricity amount of Chi Bao and the computation subunit of remaining capacity.
S805. the real time electrical quantity percentage SOC1 of current each battery pack is calculated, wherein real time electrical quantity percentage is equal to electricity
The initial residual electricity Q0 of Chi Bao the total capacity Qt divided by battery pack, i.e. SOC1=Q0/Qt.
S806. the real-time internal resistance Rr of battery core unit in the open-circuit voltage Vk and battery pack of each battery pack is obtained.
In some embodiments, the open-circuit voltage Vk of battery pack 110 is calculated according to the electricity percentage curve of battery pack.
Refering to what is shown in Fig. 9, showing the relation curve of electricity percentage and battery pack open-circuit voltage in battery pack.Horizontal seat in figure
Mark indicates that electricity percentage, ordinate indicate battery pack open-circuit voltage.Battery pack open-circuit voltage be in battery pack voltage it is minimum
Single-unit battery core voltage.In battery pack factory, the open-circuit voltage and electricity percentage curve of battery pack 110 determine substantially.
In some embodiments, power supply device 130 further includes memory module, for electricity percentage in storage battery packet with
The relation curve of battery pack open-circuit voltage.Specifically, electricity percentage and battery pack 110 in memory module storage battery packet 110
The corresponding tables of data of open-circuit voltage, after the real time electrical quantity percentage SOC1 of battery pack is calculated in step S405, BMS control
Unit 143 calls the relation curve or relationship of electricity percentage and battery pack open-circuit voltage in storage battery packet in memory module
Table, the real time electrical quantity percentage SOC1 according to the battery pack being calculated search the open-circuit voltage Vk of corresponding battery pack to obtain
To the open-circuit voltage Vk of battery pack.In this way, accurate electricity can be obtained according to the real time electrical quantity percentage SOC1 being calculated
The open-circuit voltage Vk of Chi Bao reduces the open-circuit voltage Vk measurement error of battery pack.
In some embodiments, the real-time internal resistance Rr of battery core unit is calculated according to the battery core internal resistance meter of battery pack.
It is the battery core internal resistance table of an illustrative battery pack with reference to shown in the following table 1.Row indicates temperature, ordered series of numbers in table
Indicate the open-circuit voltage of battery pack.Specifically, the battery core internal resistance table of memory module also storage battery packet.In some specific implementations
In example, battery pack 110 includes temperature sensing circuit, for detecting the temperature of battery pack, specifically, temperature sensing circuit detection electricity
The temperature of battery core in pond packet 110.When battery pack is inserted into battery pack port 132, by the terminal of battery pack port 132 by battery
The temperature information of packet is transmitted in BMS control unit 143, and BMS control unit 143 receives the temperature data and battery pack of battery pack
Corresponding open-circuit voltage data, the temperature data and corresponding open-circuit voltage data search battery core internal resistance table of foundation battery pack, from
And obtain the real-time internal resistance Rr of battery core unit.
Table 1
S807. the remaining capacity Qs of each battery pack is calculated, remaining capacity Qs is equal to the open-circuit voltage Vk and electricity of battery pack
The difference of the discharge cut-off voltage Vc of Chi Bao and the ratio between the real-time internal resistance Rr, i.e. Qs=(Vk-Vc)/Rr of battery core unit.
In some embodiments, letter of the discharge cut-off voltage of the battery pack stored in battery pack through battery pack port 132
Number terminal is transferred in power supply device 130 for the calling of BMS control module 160.In further embodiments, power supply device 130
Including memory module, for the id information of storage battery packet and the discharge cut-off voltage of corresponding battery pack.
The residue of battery pack is calculated by the open-circuit voltage Vk of calibrated battery pack and the real-time internal resistance Rr of battery core unit
Electricity Qs reduces the measurement error of battery pack remaining capacity, improves the accuracy of battery pack remaining capacity.
S808. the remaining capacity QS of portable electric energy system is calculated, the remaining capacity QS of portable electric energy system, which is equal to, to be connect
Enter the sum of the remaining capacity Qs of each battery pack of power supply device 130.
S809. the socking out time ts of portable electric energy system, the socking out time of portable electric energy system are calculated
Equal to discharge current I, namely namely ts=Qs/I of the remaining capacity QS divided by portable electric energy system of portable electric energy system.
Wherein, the discharge current I of portable electric energy system be equal to it is each access battery pack port 132 battery pack discharge current If it
With.
Thus the socking out time for obtaining portable electric energy system, when reducing the socking out of portable electric energy system
Between error, can be improved the utilization efficiency of battery pack electric energy.
In some embodiments, remaining capacity QS and discharge current I of the BMS control module 160 according to portable electrical energy system
The socking out time ts of portable electric energy system is calculated.In further embodiments, power supply device further includes display mould
Block, for showing the remaining capacity QS and socking out time ts of portable electric energy system to facilitate user to read.Specifically, aobvious
Show that module is display screen.In further embodiments, the power supply device of portable electric energy system includes wireless communication module 161,
Remaining capacity QS and socking out time ts can be wirelessly transmitted to terminal interface and shown with the mobile terminal communications such as mobile phone.
When battery pack 110 accesses battery pack port 132, BMS control module 160 is configured as the battery pack of judgement access
110 are in charged state or electric discharge device.
With reference to the measuring method flow chart shown in Fig. 10 for portable electric energy system, which further includes following
Step:
S101. the voltage Vl of the minimum single-unit battery core of the battery pack of access is read respectively.
S102. the initial quantity of electricity percentage SOC0 according to the voltage calibration battery pack of the minimum single-unit battery core of battery pack.
S103. judge whether the battery pack of access is in charged state；If the battery pack of access is in charged state, turn
To step S104；Otherwise step S801 is gone to.
In some embodiments, judge whether battery pack is in charging shape by having detected whether charging current input
State.Specifically, the electric current of detection charging port 133, shows that battery pack is in charging shape if charging port 133 has electric current inflow
State.
S104. the charging current Ic of each battery pack is detected；
S105. judge whether charging current is less than 0.1C, wherein C indicates the nominal total capacity of battery pack；If otherwise returning to step
Rapid S104；If executing step S106.
S106. the electricity Δ Q being filled with to battery pack is calculated, has been filled with to the electricity Δ Q of battery pack and has been equal to charging current
The integral of Ic and charging time t, i.e.,
S107. judge to be filled with to the electricity of battery pack the battery pack total capacity Qt for whether being more than or equal to 0.3 times；If otherwise
Return step S106, if so then execute step S108.
S108. the minimum single-unit battery core voltage of battery pack is read.
S109. the electricity percentage SOC1 after the charging of minimum single-unit battery core voltage calibration is utilized.
S110. calibration battery packet total capacity Qt, wherein Qt=Δ Q/ (SOC1-SOC0).
In some embodiments, will by calibration battery pack total capacity bring into step S401 can further improve it is portable
The measurement accuracy of the remaining capacity of formula electrical energy system.
Above-mentioned steps can be executed by the way that the software program of BMS control module 160 is written.
With reference to shown in Figure 11 and Figure 12, power supply device 130 further includes electronic building brick, fan 170 and power detection module
171.Wherein, electronic building brick is located in shell 131, and electronic building brick generates heat when power supply device 130 works.Specifically, electronics
Component includes the electronic component of the circuit board and each circuit of composition in shell 131.
Fan 170 rotates so that generating air-flow in shell 131 as electronic building brick heat dissipation.In some embodiments, fan
170 are electrically connected with BMS module 140, receive the control signal from BMS module 140 to adjust 170 revolving speed of fan.Another
In embodiment, fan 170 and control module 160, such as be electrically connected independently of the control chip of BMS control panel, reception comes from
The control signal of control module 160 is to adjust 170 revolving speed of fan.
Power detection module 171 is used to detect input or the output power of power supply device 130.In some embodiments, function
The battery pack port 132 of rate detection module 171 and power supply device 130 is electrically connected, for detecting the input power of power supply device.
In further embodiments, the alternating current output interface 172 of power detection module 171 and power supply device, such as handed over for exporting
The output interface of galvanic electricity is electrically connected, for detecting the output power of power supply device 130.In further embodiments, power is examined
It surveys module 171 to be electrically connected with the output interface of the battery pack port 132 of power supply device 130 and power supply device 130 respectively, be used for
Detect the input power and output power of power supply device 130.In some specific embodiments, power detection module 171 includes
Power chip and the peripheral circuit being electrically connected therewith.In another specific embodiment, power detection module 171 includes power
Detection circuit.
It is described in detail in power supply device below in conjunction with Figure 13 and adjusts fan turn according to the input of power supply device or output power
The method of speed, this method comprises the following steps:
S201. the output power of power supply device is detected.
In some embodiments, the output power of power detection module detection power supply device.
S202. data related with power supply device efficiency curve are stored.
In some embodiments, power supply device further includes memory module, and memory module storage and 130 efficiency of power supply device are bent
The related data of line.
It is the efficiency curve diagram of power supply device with reference to shown in Figure 14.Abscissa indicates the output power of power supply device in figure,
Ordinate indicates efficiency.The output power of storage power supply device and its corresponding efficiency data in memory module.
S203. power supply dress is calculated according to the output power Po of power supply device and data related with power supply device efficiency curve
Set 130 power loss Δ P.
In some embodiments, control module call the output power of power supply device stored in memory module and with output
The corresponding efficiency data of power, and corresponding efficiency eta is searched according to output power Po, then the function of power supply device 130 is calculated
Δ P=Po/ η-Po is lost in rate.
S204. judge whether power loss Δ P increases, if so then execute step S205；It is no to then follow the steps S206.
In some embodiments, judge that the increasing of power loss adds deduct by comparing the power loss variations of surrounding time
It is small.In another embodiment, increaseing or decreasing for power loss is judged by calculating the slope of power loss.
S205. increase the revolving speed of fan.
Specifically, control module power loss increase when output make the increased control signal of revolving speed of fan to fan with
Increase rotation speed of the fan, so that the air-flow increased in power supply device is flowed to increase radiating rate.
S206. reduce the revolving speed of fan.
Specifically, control module power loss reduce when output reduce the revolving speed of fan control signal to fan with
Reduce rotation speed of the fan, to reduce the loss of electric energy.
Aforesaid way can be executed by the way that the software program of control module is written.
Rotation speed of the fan is adjusted using the variation of the power loss of power supply device, without additionally increasing temperature in power supply device
Detection unit is spent, increases the radiating efficiency of power supply device while cost is reduced.
With reference to shown in Figure 15, for another method adjusted the speed for fan 170 in power supply device 130, this method includes such as
Lower step:
S501. the input power Pi of power supply device is detected.
S502. data related with power supply device efficiency curve are stored.
Specifically, storing the input power Pi and its corresponding efficiency data η of power supply device in memory module.
S503. power supply dress is obtained according to the input power Pi of power supply device and data related with power supply device efficiency curve
The power loss Δ P set, wherein Δ P=Pi η.
S504. judge whether power loss Δ P increases, then follow the steps S505 if increasing；It is no to then follow the steps S506.
S505. increase the revolving speed of fan.
S506. making the revolving speed of fan reduces.
Aforesaid way can by be written control module software program execute, with method shown in Figure 13 the difference is that
The input power of power supply device is detected in step S501, which is not described herein again for specific implementation.
With reference to shown in Figure 16, for the speed regulating method of another fan for power supply device, this method comprises the following steps:
S601. the input power Pi and output power Po of power supply device are detected.
S602. the power loss Δ P of power supply device is obtained according to the input power Pi and output power Po of power supply device,
In, Δ P=Po-Pi.
S603. judge whether power loss Δ P increases, then follow the steps S604 if increasing；It is no to then follow the steps S605.
S604. increase the revolving speed of fan.
S605. making the revolving speed of fan reduces.
Aforesaid way can by be written control module software program execute, with method shown in Figure 14 the difference is that
The input power and output power of power supply device are detected in step S801, which is not described herein again for specific implementation.
The basic principles, main features and advantages of the invention have been shown and described above.The technical staff of the industry should
Understand, the above embodiments do not limit the invention in any form, all obtained by the way of equivalent substitution or equivalent transformation
Technical solution is fallen within the scope of protection of the present invention.
Claims (10)
1. a kind of measurement method for portable electric energy system, the portable electric energy system includes power supply device and the electricity
Multiple battery packs that source device is detachably connected, the measurement method include the following steps:
Obtain the total capacity and initial quantity of electricity percentage of each battery pack；
Detect discharge current and the discharge time of each battery pack；
Calculate the discharge electricity amount of each battery pack, wherein the discharge electricity amount of the battery pack is equal to putting for the battery pack
The integral of electric current and discharge time；
The initial residual electricity of current each battery pack is calculated, the initial residual electricity of the battery pack is equal to the battery
The total capacity of packet and the product of the initial quantity of electricity percentage subtract discharge electricity amount；
The real time electrical quantity percentage of current each battery pack is calculated, the real time electrical quantity percentage is equal to the battery pack
Remaining capacity divided by the battery pack total capacity；
Obtain the real-time internal resistance of battery core unit in the open-circuit voltage and the battery pack of the battery pack；
Calculate the remaining capacity of current each battery pack, the remaining capacity is equal to putting for the open-circuit voltage and battery pack
The ratio between the real-time internal resistance of the difference of electric blanking voltage and the battery core unit；
The remaining capacity of the portable electric energy system is calculated, the remaining capacity of the portable electric energy system is equal to described in access
The sum of remaining capacity of battery pack of power supply device.
2. measurement method according to claim 1, which is characterized in that
The open-circuit voltage of the battery pack is calculated according to the electricity percentage curve of the battery pack.
3. measurement method according to claim 1, which is characterized in that
The real-time internal resistance of the battery core unit is calculated according to the battery core internal resistance meter of the battery pack.
4. measurement method according to claim 1, which is characterized in that
The measurement method is further comprising the steps of:
Read the id information of the battery pack of access；
Judge whether the id information of the battery pack stores to the power supply device；
If the id information of the battery pack stores the total capacity for reading the battery pack to the power supply device.
5. measurement method according to claim 1, which is characterized in that
The measurement method further include:
The socking out time of the portable electric energy system is calculated, the socking out time of the portable electric energy system is equal to
The remaining capacity of the portable electric energy system divided by the portable electric energy system discharge current, wherein it is described portable
The discharge current of electrical energy system is equal to the sum of each described battery pack discharge current.
6. measurement method according to claim 1, which is characterized in that
Further include following steps:
Judge whether the battery pack of access is in charged state；
If the battery pack of the access is in charged state:
Read the voltage of the minimum single-unit battery core of the battery pack；
The initial quantity of electricity percentage of battery pack described in voltage calibration according to the minimum single-unit battery core of the battery pack.
7. measurement method according to claim 6, which is characterized in that
The voltage and electricity percentage curve of minimum single-unit battery core according to the battery pack calibrate the initial electricity of the battery pack
Measure percentage.
8. a kind of portable electric energy system, comprising:
Battery pack can at least power for electric tool；
Power supply device, for making the battery pack output electric energy or inputing power to the battery pack；
The power supply device includes:
Battery packet interface, for accessing the battery pack；
BMS control module, is configured as:
Obtain the total capacity and initial quantity of electricity percentage of each battery pack；
Detect discharge current and the discharge time of each battery pack；
Calculate the discharge electricity amount of each battery pack, wherein the discharge electricity amount of the battery pack is equal to putting for the battery pack
The integral of electric current and discharge time；
The remaining capacity of current each battery pack is calculated, the remaining capacity of the battery pack is equal to total appearance of the battery pack
Amount and the product of the initial quantity of electricity percentage subtract discharge electricity amount；
The real time electrical quantity percentage of current each battery pack is calculated, the real time electrical quantity percentage is equal to the battery pack
Remaining capacity divided by the battery pack total capacity；
Obtain the real-time internal resistance of battery core unit in the open-circuit voltage and the battery pack of the battery pack；
Calculate the remaining capacity of current each battery pack, the remaining capacity is equal to putting for the open-circuit voltage and battery pack
The ratio between the real-time internal resistance of the difference of electric blanking voltage and the battery core unit；
The remaining capacity of the portable electric energy system is calculated, the remaining capacity of the portable electric energy system is equal to described in access
The sum of remaining capacity of battery pack of power supply device.
9. portable electric energy system according to claim 8, which is characterized in that
The BMS control module is configured as:
The open-circuit voltage of the battery pack is calculated according to the electricity percentage curve of the battery pack.
10. portable electric energy system according to claim 8, which is characterized in that
The BMS control module is configured as:
The real-time internal resistance of the battery core unit is calculated according to the battery core internal resistance meter of the battery pack.
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| 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 |
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