CN108964173A - Active equalization system for battery pack - Google Patents
Active equalization system for battery pack Download PDFInfo
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- CN108964173A CN108964173A CN201810586921.9A CN201810586921A CN108964173A CN 108964173 A CN108964173 A CN 108964173A CN 201810586921 A CN201810586921 A CN 201810586921A CN 108964173 A CN108964173 A CN 108964173A
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- 238000000034 method Methods 0.000 description 13
- 239000000178 monomer Substances 0.000 description 12
- 238000001514 detection method Methods 0.000 description 11
- 230000005611 electricity Effects 0.000 description 10
- 238000011897 real-time detection Methods 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 238000007726 management method Methods 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- 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)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The present invention provides a kind of active equalization system for battery pack, belongs to field of batteries.Active equalization system includes: voltage sensor, the voltage of each section single battery for detecting battery pack；Switching Power Supply；Controller is used for: control switch power supply carries out first time charging to each section single battery respectively with the first current value；The first voltage of each section single battery is obtained by voltage sensor；Control switch power supply carries out second to each section single battery respectively with the second current value and charges；The second voltage of each section single battery is obtained by voltage sensor；Calculate the real voltage of each single battery；The real voltage of each section single battery is compared, determines the difference between the maximum value and minimum value of the real voltage of single battery；Judge whether difference is greater than the starting voltage threshold for needing to open active equalization；In the case where judging that difference is greater than starting voltage threshold, active equalization operation is executed.
Description
Technical field
The present invention relates to field of batteries, more particularly to a kind of active equalization system for battery pack.
Background technique
Due to parameter differences of the lithium battery group in production, partial volume, the consistency of lithium battery group is had differences, and because
The difference of further battery group practical service environment, with the increase of battery cyclic number, cause battery with two side terminals difference by
It is cumulative to add, influence battery life.The consistency of battery pack can be improved by equilibrium.
Current equalization technology can be divided into passive balanced and active equalization.For passive equilibrium, when judging a few batteries
When monomer voltage is apparently higher than other batteries, then equalizing circuit is opened to it, discharge it, improves its consistency；For
Active equalization then opens equalizing circuit when judging the monomer voltage of a few batteries significantly lower than other batteries to it, right
It charges, and improves its consistency.From the above it can be seen that no matter which kind of balanced way, pass through the monomer of battery electricity mostly
Pressure, to judge whether the batteries need to open equilibrium, therefore the accuracy of monomer voltage detection directly affects balanced unlatching
Accuracy, however since monomer voltage detection line is often longer, the presence of line resistance causes the error of voltage detecting larger, especially
It is when equilibrium is opened, the presence of euqalizing current causes to have differences between the measured value of battery cell voltage and true value, shadow
Ring battery balanced accuracy.The condition currently opened often through the cell voltage value before balanced open as equilibrium, influences
The validity and accuracy that equilibrium is opened.
Summary of the invention
The object of the present invention is to provide a kind of active equalization system for battery pack, which can make
The consistency of the voltage of single battery after active equalization is higher.
To achieve the goals above, the present invention provides a kind of active equalization system, which includes:
Voltage sensor, the voltage of each section single battery for detecting the battery pack；
Switching Power Supply；
Controller connect with the voltage sensor, the Switching Power Supply respectively, is used for:
It controls the Switching Power Supply and first time charging is carried out to each section single battery respectively with the first current value；
The first voltage of each section single battery is obtained by the voltage sensor；
It controls the Switching Power Supply and second of charging is carried out to each section single battery respectively with the second current value；
The second voltage of each section single battery is obtained by the voltage sensor；
The real voltage V of each section single battery is calculated according to equation (1)T,
Wherein, VC1For the first voltage, VC2For the second voltage, R1To be connected to institute in the active equalization system
State the resistance value of the route of one end of single battery, R2For the other end for being connected to the single battery in the active equalization system
Route resistance value, VTFor the real voltage of the single battery；
The real voltage of single battery described in each section is compared, determines the true of the single battery of the battery pack
Difference between the maximum value and minimum value of voltage；
Judge whether the difference is greater than the starting voltage threshold for needing to open the active equalization；
In the case where judging that the difference is greater than the starting voltage threshold, active equalization operation is executed.
Optionally, the starting voltage threshold is 20 to 60 millivolts.
Optionally, the execution active equalization, which operates, includes:
The minimum at least section single battery of real voltage is filtered out from the battery pack carries out active equalization；
Obtain the voltage of the single battery by active equalization in real time by the voltage sensor；
Judge whether the voltage of the single battery by active equalization is less than the true electricity of the remaining single battery
Pressure；
It is not less than the true electricity of the remaining single battery in the voltage for judging the single battery by active equalization
In the case where at least one of pressure, restart the operation for executing the controller.
Optionally, the charging time of the first time charging is 0.1 second to 1 second.
Optionally, the voltage sensor includes battery management system BMS.
Optionally, the charging time of second of charging is 0.1 second to 1 second.
Optionally, the controller is microcontroller.
Through the above technical solutions, the active equalization system provided by the present invention for battery pack passes through change single battery
The size of charging current carry out the line resistance of counting circuit so that more accurate to the detection of the real voltage of single battery,
To the consistency of the voltage of single battery of the raising after active equalization.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
The drawings are intended to provide a further understanding of the invention, and constitutes part of specification, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the flow chart of the active equalization method for battery pack according to embodiment of the present invention；
Fig. 2 is the structural block diagram of the active equalization system for battery pack according to embodiment of the present invention；With
And
Fig. 3 is the schematic diagram of the line resistance of the circuit for battery pack according to embodiment of the present invention.
Specific embodiment
Below in conjunction with attached drawing, detailed description of the preferred embodiments.It should be understood that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
It is the process of the active equalization method for battery pack according to embodiment of the present invention as shown in Figure 1
Figure.In Fig. 1, which may include:
In step S01, first time charging is carried out to each section single battery in battery pack respectively with the first current value.
In the embodiment of the invention, the value range of first current value can be such as 1 milliampere (mA) to 100mA.The step
Rapid 01 can be each section single battery progress for example by controller control switch power supply with the first current value to battery pack
Charging is to execute, it is contemplated that the design of route needs, which can be passed through terminal A as shown in Figure 3 and end
Point B accesses the both ends of the single battery (by taking a single battery as an example) of battery pack.In an example of the invention, in order to keep away
When exempting to impact the voltage of the single battery since the charging time is too long, while considering the reaction of voltage detection device
Between, the charging time of first time charging can be, for example, 0.1 second (s) to 1s.
In step S02, the first voltage of each section single battery is detected respectively.In the embodiment of the invention,
Step S02 can be for example to pass through voltage sensor and be used to execute the circuit of the active equalization method and (such as show in Fig. 3
Terminal A and terminal B) route access the positive and negative anodes of each section single battery to detect the first voltage of the single battery.This
Outside, it is contemplated that the cost of actual circuit design can also directly pass through battery management system (Battery Management
System, BMS) detect the first voltage.
In step S03, second is carried out to each section single battery respectively with the second current value and is charged.Of the invention
In the embodiment, the value range of second current value can be such as 1 milliampere (mA) to 100mA.The step 03 can be
Such as charged by controller control switch power supply with each section single battery of second current value to battery pack to execute,
In view of the design of route needs, which can be accessed into battery by terminal A as shown in Figure 3 and terminal B
The both ends of the single battery (by taking a single battery as an example) of group.In an example of the invention, in order to avoid due to charging
Overlong time and the voltage of the single battery is impacted, while consider voltage detection device reaction time, this second
The charging time of secondary charging can be, for example, 0.1 second (s) to 1s.
In step S04, the second voltage of each section single battery is detected respectively.In the embodiment of the invention,
Step S04 can be for example by voltmeter pass through be used to execute the active equalization method circuit (such as shown in Fig. 3 hold
Point A and terminal B) route access the positive and negative anodes of each section single battery to detect the second voltage of the single battery.In addition, examining
The cost for considering actual circuit design, can also directly detect the second voltage by BMS.
In step S05, the real voltage V of each section single battery is calculated according to equation (1)T,
Wherein, VC1For first voltage, VC2For second voltage, I1For the first current value, I2For the second current value, R1For for
Execute the active equalization method is electrically connected to single battery (such as single battery B shown in Fig. 31) one end route
Resistance value (as shown in Figure 3), R2For be connected in the circuit single battery the other end route resistance value (as shown in Figure 3), VT
For the real voltage of single battery.In the embodiment of the invention, the equation (1) can be for example fixed by kirchhoff
What rule obtained.By solving equation (1) it can be concluded that formula (1),
It is obtained by bringing above-mentioned first voltage, second voltage, the first current value and the second current value in formula (1) into
The real voltage of the single battery.
In step S06, the real voltage of each section single battery is compared, determines the single battery of the battery pack
Real voltage maximum value and minimum value between difference.In an embodiment of the invention, it can be and for example control
The real voltage of each section single battery is compared device, so that it is determined that the maximum value of the real voltage of the single battery and most
Difference between small value.
In step S07, judge whether difference is greater than the starting voltage threshold for needing to open active equalization.Of the invention
In the embodiment, certain entry condition is needed due to opening active equalization, such as each single battery in battery pack
Voltage difference is greater than the starting voltage threshold for needing to open active equalization.At this point, each single battery in battery pack is inconsistent
Property can seriously affect the delivery efficiency of battery pack entirety, it is therefore desirable to open active equalization.So calculating difference in step S06
After value, the difference is compared with starting voltage threshold in step S07, judges whether the difference is greater than the starting voltage
Threshold value, to judge whether the battery pack needs to open active equalization.For the value of the starting voltage threshold, basis can be
The quantity of single battery in actual battery group and output voltage determine, in the embodiment of the invention, in the electricity
In the case that pond group is lithium battery group, which can be set as to 20 millivolts (mV) to 60mV.In other materials
Battery pack in the case where, which also can be set as other numerical value.In addition, being opened judging that the difference is not more than
In the case where dynamic voltage threshold, illustrate that the battery pack is unsatisfactory for the entry condition of the active equalization at this time, therefore can directly tie
Shu Benci active equalization.In view of needing the real voltage of detection trigger single battery before executing active equalization operation
Condition, it is possible to be for example artificially to start this for after executing the circuit of the active equalization method, which to pass through detection
Real voltage judges whether the battery pack meets entry condition, further judges whether in the case where meeting entry condition
Need to open active equalization operation.In another example of the invention, it is also possible to for example preset a time cycle,
The mechanism of the real voltage of the single battery is detected every a time cycle starting, and whether further judges the battery pack
Meet the condition of active equalization, which can be such as 1 hour, 2 hours or 24 hours.The above-mentioned numerical value enumerated is for example
" 1 hour " etc. is only limitted to explain the present invention, does not cause to limit to protection scope of the present invention.In same technology structure of the invention
Under think of, according to different use conditions (such as quantity, frequency of use of equipment of battery etc.), above-mentioned each numerical value can phase
It should change.
In the case where judging that difference is greater than starting voltage threshold, active equalization operation is executed.In the implementation of the invention
In mode, in the case where judging that the difference is greater than starting voltage threshold, illustrate that the battery needs to open active equalization at this time, because
This can open active equalization operation.In an example of the invention, active equalization operation can be such as step
S08, step S09 and step S10.
In step S08, it is actively equal that the minimum at least section single battery progress of real voltage is filtered out from battery pack
Weighing apparatus.In the embodiment of the invention, step S08 can be for example by at least section real voltage in the battery pack most
Low single battery carries out active equalization (such as being charged such that the voltage of the single battery increases to the single battery).
In step S09, real-time detection is by the voltage of the single battery of active equalization.In the embodiment of the invention
In, step S09 can be the voltage for example by the BMS real-time detection single battery by active equalization.
In step slo, judge whether the voltage by balanced single battery is less than all single batteries in battery pack
Real voltage.In this embodiment, the voltage of the BMS real-time detection single battery by active equalization, the single battery
Voltage due to that can be increased with the increase in charging time after active equalization (charging), when this is by balanced single battery
When voltage is not less than at least one of the real voltage of all single batteries in battery pack, illustrate that the single battery is not the electricity
The minimum single battery of voltage in the group of pond, therefore do not need again to carry out the single battery balanced.But already can not at this time
Judge whether the battery pack has been unsatisfactory for the condition of active equalization, so needing to detect each section monomer in the battery pack again
The real voltage of battery, therefore in judging the real voltage for being not less than all single batteries by balanced single battery at least
In the case where one, the active equalization method (i.e. return step S01) is reopened.In addition, judging this by balanced monomer
In the case that battery is less than the real voltage of all single batteries, illustrate that the single battery still needs active equalization at this time, institute
To continue to carry out the single battery active equalization (charging) until this is not less than all single batteries by balanced single battery
At least one of real voltage.
Another aspect of the present invention also provides a kind of active equalization system for battery pack.As shown in Fig. 2, this is actively equal
Balance system may include voltage sensor 01, Switching Power Supply 02 and controller 03.
The voltage sensor 01 can be used for detecting the voltage of each section single battery of battery pack.It should due to needing to consider
The line of active equalization system hinders, and therefore, which, which can be, is for example connected to monomer by the active equalization system
The route (such as terminal A and terminal B shown in Fig. 3) at battery both ends accesses the anode and cathode of the single battery.
Controller 03 can be connect with voltage sensor 01, Switching Power Supply 02 respectively, can be used for executing as shown in Figure 1
Active equalization method:
In step S01, control switch power supply 02 respectively carries out for the first time each section single battery with the first current value
Charging.In the embodiment of the invention, the value range of first current value can be such as 1 milliampere (mA) to 100mA.
Step S01 can be for example that (such as DC-DC converts electricity by the output circuit of control switch power supply 02 by controller 03
Road) output electric current is adjusted, to charged with each section single battery of first current value to battery pack executing, consider
Design to route needs, which can be accessed battery pack by terminal A as shown in Figure 3 and terminal B
Single battery (by taking a single battery as an example) both ends.In an example of the invention, when in order to avoid due to charging
Between it is too long and the voltage of the single battery is impacted, while in view of voltage detection device (such as voltage sensor 01)
Reaction time, the charging time of first time charging can be, for example, 0.1 second (s) to 1s.
In step S02, the first voltage of each section single battery is obtained by voltage sensor 01.The voltage sensor
The mode of 01 line attachment is above-mentioned to be had been described in, and details are not described herein again.In addition, it is contemplated that the cost of actual circuit design,
The first voltage can also be directly detected by BMS.
In step S03, control switch power supply 02 respectively carries out each section single battery second with the second current value
Charging.In the embodiment of the invention, the value range of second current value can be such as 1 milliampere (mA) to 100mA.
In addition, impacting in order to avoid too long due to the charging time to the voltage of the single battery, while considering voltage detecting
The reaction time of equipment should charging time of second charging can be, for example, 0.1 second (s) to 1s.
In step S04, the second voltage of each section single battery is obtained by voltage sensor 01.
In step S05, the real voltage V of each section single battery is calculated according to equation (1)T,
Wherein, VC1For first voltage, VC2For second voltage, I1For the first current value, I2For the second current value, R1For actively
Single battery (such as single battery B shown in Fig. 3 is connected in equal balance system1) one end route resistance value (such as Fig. 3 institute
Show), R2For be connected in active equalization system single battery the other end route resistance value (as shown in Figure 3), VTFor monomer electricity
The real voltage in pond.In the embodiment of the invention, the equation (1), which can be, for example to be obtained by Kirchhoff's law
's.By solving equation (1) it can be concluded that formula (1),
It is obtained by bringing above-mentioned first voltage, second voltage, the first current value and the second current value in formula (1) into
The real voltage of the single battery.
In step S06, the real voltage of each section single battery is compared, determines the single battery of battery pack
Difference between the maximum value and minimum value of real voltage.
In step S07, judge whether difference is greater than the starting voltage threshold for needing to open active equalization.Of the invention
In the embodiment, certain entry condition is needed due to opening active equalization, such as each single battery in battery pack
Voltage difference is greater than the starting voltage threshold for needing to open active equalization.At this point, each single battery in battery pack is inconsistent
Property can seriously affect the delivery efficiency of battery pack entirety, it is therefore desirable to open active equalization.So controller 03 is in step S06
After calculating difference, the difference is compared with starting voltage threshold in step S07, judges whether the difference is greater than this
Start voltage threshold, to judge whether the battery pack needs to open active equalization.It, can for the value of the starting voltage threshold
Being determined according to the quantity of the single battery in actual battery group and output voltage, in the embodiment of the invention
In, in the case where the battery pack is lithium battery group, which can be set as to 20 millivolts (mV) to 60mV.?
In the case where the battery pack of other materials, which also can be set as other numerical value.In addition, judging the difference
In the case where no more than starting voltage threshold, illustrate that the battery pack is unsatisfactory for the entry condition of active equalization operation at this time, because
This can directly terminate this active equalization.In view of needing detection trigger monomer during active equalization system work
The condition of the real voltage of battery, it is possible to be for example in artificial starting (such as the setting trigger button) active equalization system
Afterwards, which judges whether the battery pack meets entry condition by detection real voltage, is meeting trip bar
Further judge whether to need to open active equalization operation in the case where part.It in another example of the invention, can also be with
It is for example to preset a time cycle in controller 03 in advance, so that the controller 03 starts every the time cycle
The mechanism of the real voltage of the single battery is detected, and further judges whether the battery pack meets the condition of active equalization.Control
Device 03 processed executes active equalization operation in the case where judging that difference is greater than starting voltage threshold.In the embodiment party of the invention
In formula, in the case where judging that the difference is greater than starting voltage threshold, illustrate that the battery needs to open active equalization at this time, therefore
Active equalization operation can be opened.In an example of the invention, the active equalization operation can be such as step S08,
Step S09 and step S10.
In step S08, controller 03 filtered out from battery pack the minimum at least section single battery of real voltage into
Row active equalization.In the embodiment of the invention, step S08 can be for example that at least section in the battery pack is true
The minimum single battery progress active equalization of real voltage (such as controller 03 is filled by control switch power supply 02 to the single battery
Electricity is so that the voltage of the single battery increases).
In step S09, controller 03 is by 01 real-time detection of voltage sensor by the electricity of the single battery of active equalization
Pressure.In the embodiment of the invention, step S09 be can be for example through BMS (i.e. voltage sensor 01) real-time detection
The voltage of the single battery by active equalization.
In step slo, judge whether the voltage by balanced single battery is less than the real voltage of single battery.?
In the embodiment, the voltage of the BMS real-time detection single battery by active equalization, the voltage of the single battery is due to being led
It can increase with the increase in charging time after dynamic equilibrium (charging), when the voltage by balanced single battery is not less than monomer
When at least one of real voltage of battery, illustrate that the single battery is not the minimum monomer electricity of voltage in the battery pack
Pond, therefore do not need again to carry out the single battery balanced.But whether controller 03 already can not judge the battery pack at this time
It has been unsatisfactory for the condition of active equalization, so need to detect the real voltage of each section single battery in the battery pack again,
Therefore in the case where judging this by balanced single battery and being not less than at least one of the real voltage of all single batteries, control
Device 03 processed reopens the active equalization method (again return to and execute step S01).In addition, controller 03 is judging that this is equal
In the case that the single battery of weighing apparatus is less than the real voltage of all single batteries, illustrate that the single battery still needs actively at this time
Equilibrium, so continuing to carry out the single battery active equalization (charging) until this is not less than all lists by balanced single battery
At least one of the real voltage of body battery.
In an embodiment of the invention, the controller 03 can for general processor, application specific processor, it is conventional at
Manage device, digital signal processor (DSP), multi-microprocessor, one or more microprocessors associated with DSP core, control
Device processed, microcontroller, specific integrated circuit (ASIC), field programmable gate array (FPGA) circuit, any other type collection
At circuit (IC), state machine etc..
Through the above technical solutions, the active equalization method and system provided by the present invention for battery pack are single by changing
The size of the charging current of body battery carrys out the line resistance of counting circuit, so that more to the detection of the real voltage of single battery
Accurately, to improve the consistency of the voltage of the single battery after active equalization.
Optional embodiment of the invention is described in detail in conjunction with attached drawing above, still, the present invention is not limited to it is above-mentioned can
The detail in embodiment is selected, within the scope of the technical concept of the present invention, technical solution of the present invention can be carried out more
Kind simple variant, these simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, embodiment of the present invention
To various combinations of possible ways, no further explanation will be given.
It will be appreciated by those skilled in the art that realizing that all or part of the steps in above embodiment is can to pass through journey
Sequence is completed to instruct relevant hardware, which is stored in a storage medium, including some instructions are used so that one
The whole of (can be single-chip microcontroller, chip etc.) or processor (processor) execution each embodiment the method for the application
Or part steps.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic or disk etc. are various can store journey
The medium of sequence code.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention embodiment equally should be considered as embodiment of the present invention disclosure of that.
Claims (7)
1. a kind of active equalization system for battery pack, which is characterized in that the active equalization system includes:
Voltage sensor, the voltage of each section single battery for detecting the battery pack；
Switching Power Supply；
Controller connect with the voltage sensor, the Switching Power Supply respectively, is used for:
It controls the Switching Power Supply and first time charging is carried out to each section single battery respectively with the first current value；
The first voltage of each section single battery is obtained by the voltage sensor；
It controls the Switching Power Supply and second of charging is carried out to each section single battery respectively with the second current value；
The second voltage of each section single battery is obtained by the voltage sensor；
The real voltage V of each section single battery is calculated according to equation (1)T,
Wherein, VC1For the first voltage, VC2For the second voltage, R1To be connected to the list in the active equalization system
The resistance value of the route of one end of body battery, R2For be connected in the active equalization system single battery the other end line
The resistance value on road, VTFor the real voltage of the single battery；
The real voltage of single battery described in each section is compared, determines the real voltage of the single battery of the battery pack
Maximum value and minimum value between difference；
Judge whether the difference is greater than the starting voltage threshold for needing to open the active equalization；
In the case where judging that the difference is greater than the starting voltage threshold, active equalization operation is executed.
2. active equalization system according to claim 1, which is characterized in that the starting voltage threshold is 20 to 60 millis
Volt.
3. active equalization system according to claim 1, which is characterized in that the execution active equalization, which operates, includes:
The minimum at least section single battery of real voltage is filtered out from the battery pack carries out active equalization；
Obtain the voltage of the single battery by active equalization in real time by the voltage sensor；
Judge whether the voltage of the single battery by active equalization is less than the real voltage of the remaining single battery；
In real voltage of the voltage for judging the single battery by active equalization not less than the remaining single battery
At least one in the case where, restart the operation for executing the controller.
4. active equalization system according to claim 1, which is characterized in that the charging time of charging first time is
0.1 second to 1 second.
5. active equalization system according to claim 1, which is characterized in that the voltage sensor includes battery management system
Unite BMS.
6. active equalization system according to claim 1, which is characterized in that the charging time of second charging is
0.1 second to 1 second.
7. active equalization system according to any one of claims 1 to 6, which is characterized in that the controller is microcontroller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810586921.9A CN108964173A (en) | 2018-06-06 | 2018-06-06 | Active equalization system for battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810586921.9A CN108964173A (en) | 2018-06-06 | 2018-06-06 | Active equalization system for battery pack |
Publications (1)
| Publication Number | Publication Date |
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| CN108964173A true CN108964173A (en) | 2018-12-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113964913A (en) * | 2021-11-05 | 2022-01-21 | 许继集团有限公司 | Self-adaptive voltage compensation sampling method and system |
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| CN101632028A (en) * | 2007-04-19 | 2010-01-20 | 松下电动车辆能源股份有限公司 | Apparatus and method for detecting charged state of electric storage device |
| CN102944847A (en) * | 2012-11-20 | 2013-02-27 | 无锡中星微电子有限公司 | Battery electric quantity detection method and system |
| CN106130123A (en) * | 2016-07-28 | 2016-11-16 | 北京精密机电控制设备研究所 | A kind of servo power power supply |
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| CN101632028A (en) * | 2007-04-19 | 2010-01-20 | 松下电动车辆能源股份有限公司 | Apparatus and method for detecting charged state of electric storage device |
| CN102944847A (en) * | 2012-11-20 | 2013-02-27 | 无锡中星微电子有限公司 | Battery electric quantity detection method and system |
| CN106130123A (en) * | 2016-07-28 | 2016-11-16 | 北京精密机电控制设备研究所 | A kind of servo power power supply |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113964913A (en) * | 2021-11-05 | 2022-01-21 | 许继集团有限公司 | Self-adaptive voltage compensation sampling method and system |
| CN113964913B (en) * | 2021-11-05 | 2024-06-07 | 许继集团有限公司 | Self-adaptive voltage compensation sampling method and system |
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