CN106849283B - A kind of battery modules flexible connection protective device - Google Patents
A kind of battery modules flexible connection protective device Download PDFInfo
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- CN106849283B CN106849283B CN201710243246.5A CN201710243246A CN106849283B CN 106849283 B CN106849283 B CN 106849283B CN 201710243246 A CN201710243246 A CN 201710243246A CN 106849283 B CN106849283 B CN 106849283B
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- 230000001681 protective effect Effects 0.000 title claims abstract description 41
- 230000004224 protection Effects 0.000 claims abstract description 52
- 238000007599 discharging Methods 0.000 claims abstract description 15
- 238000005070 sampling Methods 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 230000005611 electricity Effects 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 14
- 230000006870 function Effects 0.000 claims description 12
- 230000002457 bidirectional effect Effects 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 239000010409 thin film Substances 0.000 claims description 3
- 230000004069 differentiation Effects 0.000 abstract description 5
- 238000004146 energy storage Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005669 field effect Effects 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000005955 Ferric phosphate Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229940032958 ferric phosphate Drugs 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000009993 protective function Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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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
- H02J7/0014—Circuits for equalisation of charge between batteries
-
- H02J7/0026—
-
- 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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- 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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The present invention relates to a kind of battery modules be flexibly connected protective device, for realizing differentiation retired battery modules in groups and realize echelon battery utilize.The battery modules flexible connection protective device has control and protection unit; it is able to detect cell voltage and battery charging and discharging electric current and is judged; when cell voltage is greater than cell voltage protection threshold value or battery charging and discharging electric current is greater than charging and discharging currents protection threshold value, battery is exited, battery is protected；It when the cell voltage is greater than cell voltage rated value in a certain range, but is not above cell voltage protection threshold value, is discharged by discharge resistance battery, reduces cell voltage to normal working range.The invention further relates to a kind of battery pack, the battery pack is sequentially connected in series by the way that multiple battery modules are flexibly connected protective device using the battery modules.
Description
Technical field
The present invention relates to new energy fields more particularly to a kind of battery modules to be flexibly connected protective device.
Background technique
It is planned according to Development of Electric Vehicles, it is contemplated that arrive the year two thousand twenty, pure electric automobile and plug-in hybrid-power automobile production
For ability up to 2,000,000, adding up volume of production and marketing is more than 5,000,000.These electric cars will generate a large amount of retired power batteries.Although
Retired battery is no longer appropriate for using on electric car, but still has the energy storage of rated capacity 80% or so, can apply
In other field, if directly waste treatment will cause serious energy waste.Therefore, in order to make full use of the valence of power battery
Value saves social resources, needs to carry out echelon utilization to retired power battery.
Either new battery or retired power battery, battery group technology are the key that power battery sizable application.?
When the power battery assembly of building electric car or energy storage device, it is necessary first to which several single battery cores are passed through welding manner
Then several battery modules are connected and fixed the entire electricity of series-parallel composition by conductor again by fixed series-parallel composition battery modules
Pond component.Although the capacity and voltage class that different manufacturers define battery modules are different, and are also possible to define more
Layer battery modules, still, battery modules can be usually interpreted as constitute battery, to battery be easy physically split after base
This unit.Under normal circumstances, the voltage class of battery modules is tens volts, and capacity is several hundred ampere-hours.
Influencing retired power battery echelon using the primary factor of economy is dismantling journey to battery component (battery pack)
Degree.According to existing production practices, if integral battery pack broken will have been welded to individually in retired power battery
Then battery core is screened, matched and is recombinated again, due to complex process, cause cost recovery close to new battery is bought, certainly
The echelon of this technology path has been determined using uneconomical and scientific.But if it is simple remove connection conductor after, for electricity
It is then the reasonable approach that retired power battery echelon utilizes in groups that Chi Mo group, which carries out flexibility,.Therefore, for the different of battery modules
Cause property carries out flexibility and connects in groups, become the critical issue that retired power battery echelon utilizes.
In power battery in groups in use, needing to solve the inconsistency bring differential management due to battery modules
Problem.In the use process of battery, battery with two side terminals constantly deteriorates at any time, related with many factors, comprising: raw
The consistency of production, charge and discharge electric strength, sparks at use environment.Particularly with retired battery, because of material, technique, transport
The difference of operating condition frequently can lead to the problems such as pressure difference between stack battery increases, single group battery-heating is serious, need to carry out flexibility
Connection, by Balance route salvo, to guarantee the normal operation of entire battery pack.
At this stage, research and development, design initial stage are also in the research of retired battery echelon battery pack both at home and abroad, not yet greatly
Scale is promoted.It, can application No. is a kind of echelon battery pack maintenance device is disclosed in 201510584801.1 patent application
The input and output for realizing DC voltage wide scope, greatly reduce voltage and current ripple；Circuit dynamic response is rapid, have constant pressure,
Constant current, first constant pressure various modes such as constant current again, meet the needs of different type battery pack.Application No. is 201610601656.8
Patent application discloses a kind of communication base station ferric phosphate lithium cell echelon and utilizes charge-discharge system and control method, comprising: two-way
Energy accumulation current converter, echelon battery system and charging equipment of electric automobile, when communication base station power loss, controller controls echelon electricity
Cell system provides power supply automatically by echelon battery system for communication equipment in communication base station；In the low power consumption period, control
Device controls bidirectional energy-storage current transformer, is echelon battery system charging energy-storing by bidirectional energy-storage current transformer, while mentioning for communication base station
Power supply source；In the peak of power consumption period, controller controls bidirectional energy-storage current transformer, discharges echelon battery system by bidirectional energy-storage current transformer
Energy in system supports as power grid, provides charging service for electric car.Application No. is the patent Shens of 200710077318.X
Please disclose a kind of battery pack protection circuit, include first class of protection unit, can occur overcharging to battery pack, over-discharge when protect
Shield.Application No. is 201010219234.7 patent applications to disclose a kind of cell discharge protective device, solves the prior art
Present in due to battery discharge loop to load carry out oscillation of power supply, to cause larger damage to load, and shorten
The problem of battery.Application No. is a kind of short-circuit protections of 201510560800.3 patent application publication, are used for
The electric current IE that limitation can be exported by the battery pack branch including at least one battery assembly module, output electric current IA can be via two electricity
Net terminal is directed through customer network, in the first current cycle via battery pack branch, power grid terminal and customer network
Switch element is disposed in circuit, using switch element energy interruptive current IE, short-circuit protection also has for that will export
The comparator device that the size of electric current IA is compared with the scheduled rated value IS of energy.Short-circuit protection also has inductance, short circuit
Protective device has inductive current adjusting means, and the output electric current for flowing through inductance is adjustable via the inductive current adjusting means
IA, and short-circuit protection also has crossover assembly, is arranged to that at least one battery pack of battery pack branch can be bridged
Unit, and rated value IS can be limited to short circuit current IK can scheduled maximum value.Document WO-2010/089338A2 is public
Open a kind of for limiting the device of the DC current in high-energy DC grid, short-circuit protection is limited using Ohmic resistance
Electric current, the resistance are connected in energy path by quick current monitoring and power semiconductor.Led in a manner of pure digi-tal
Access/the bridging for crossing resistance limits the electric current exported by battery pack branch.6 246 214 B1 of document US discloses one
Protection circuit of the kind for battery pack charging, which includes field effect transistor, which can limit
Electric current flowing in battery pack charge or discharge.The circuit additionally includes electric discharge regulating system, is coupled to field-effect crystalline substance
It on body pipe and can determine that electric current flowing too strong in system, and transmit limitation electric current flowing to field effect transistor accordingly
Signal.
In conclusion there is at high cost, overvoltage and excess current protective function shortages for the above solution, or without equal
The problem of voltage-controlled processed.Therefore, need it is a kind of low cost, can be achieved at the same time it is cheap, can be realized overvoltage and overcurrent
Protection, balance control function flexible connection protective device, the retired battery modules of Lai Shixian differentiation in groups and realize echelon
Battery utilizes.
Summary of the invention
It can be achieved at the same time overvoltage and overcurrent protection and with balance control function this application provides a kind of
Battery modules are flexibly connected protective device, to realize the retired battery modules of differentiation in groups and realize that echelon battery utilizes.
In a first aspect, this application provides a kind of battery modules to be flexibly connected protective device characterized by comprising dynamic
State equalizing resistance (R1), sampling resistor (R2), discharge resistance (R3), dynamic voltage balancing electric capacity (C1), electric discharge with electronic switch (G3),
First electronic power switch (G1) and its anti-paralleled diode (D1) being internally integrated, the second electronic power switch (G2) and its interior
The integrated anti-paralleled diode (D2) in portion, the first relay (K1), the second relay (K2), third relay (K3) and control are protected
Protect unit；
Wherein,
One end of the dynamic voltage balancing resistance (R1) is connected with the anode of battery, the other end and dynamic voltage balancing electric capacity (C1) phase
Even；
One end of the sampling resistor (R2) is connected with the anode of battery, the other end and the first relay (K1) and third after
Electric appliance (K3) is connected；
One end of the discharge resistance (R3) is connected with the anode of battery, the other end and the leakage discharged with electronic switch (G3)
Extremely it is connected；
One end of the dynamic voltage balancing electric capacity (C1) is connected with dynamic voltage balancing resistance (R1), the cathode phase of the other end and battery
Even；
The drain electrode of first electronic power switch (G1) is connected with third relay (K3), source electrode and the second power electronics
The drain electrode for switching (G2) is connected；
The source electrode of second electronic power switch (G2) is connected with the cathode of battery, drain electrode and the first electronic power switch
(G1) source electrode is connected；
The electric discharge is connected with the drain electrode of electronic switch (G3) with discharge resistance (R3), and source electrode is connected with the cathode of battery；
One end of first relay (K1) is connected with sampling resistor (R2), the other end and the second relay (K2),
The drain electrode of the source electrode and the second electronic power switch (G2) of one electronic power switch (G1) is connected；
One end of second relay (K2) and the first relay (K1), the first electronic power switch (G1) source electrode and
The drain electrode of second electronic power switch (G2) is connected, and the other end is connected with the cathode of battery；
One end of the third relay (K3) is connected with sampling resistor (R2), the other end and the first electronic power switch
(G1) drain electrode is connected；
The first port and second port of the control and protection unit are connected with the both ends of sampling resistor (R2) respectively, third
Port is connected with the cathode of battery, makes the input of the control and protection unit be cell voltage by first to third port
(V1) and the end voltage (V2) of sampling resistor (R2)；The output of the control and protection unit be the first electronic power switch (G1),
Second electronic power switch (G2), the electric discharge gate pole of electronic switch (G3) control signal and the first relay (K1), second after
The control signal of electric appliance (K2), third relay (K3)；
First and second ports of the charge and discharge incoming end of the battery modules flexible connection protective device are connected to
The both ends of second relay (K2) are to realize that the battery modules are flexibly connected the charging/discharging function of protective device.
Preferably,
The dynamic voltage balancing resistance (R1) is power resistor；
The dynamic voltage balancing electric capacity (C1) is thin-film capacitor；
The sampling resistor (R2) is high-power alloy sampling resistor；
The discharge resistance (R3) is high-power resistance；
First electronic power switch (G1), the second electronic power switch (G2), electric discharge are with electronic switch (G3)
Mosfet；
First relay (K1), the second relay (K2), third relay (K3) are magnetic latching relay.
The control and protection unit is based on digital circuit or analog logic circuit is realized.
Further, the control and protection unit is realized based on digital processing chip.
Wherein, the battery modules flexible connection protective device has following working condition:
Charging and discharging state: the first relay (K1) closure, other switches disconnect；
Bypass condition: the second relay (K2) closure, other switches disconnect；With
Equalizing voltage state: electric discharge is closed with electronic switch (G3), the second relay (K2) closure, and other switches are disconnected
It opens.
Further, the control and protection unit includes following functions module:
Battery voltage threshold judgment module, for carrying out voltage threshold judgement；
Battery charging and discharging current threshold judgment module carries out electric current for detecting the end voltage (V2) of sampling resistor (R2)
Threshold decision；
Power module connects cell voltage (V1), for converting the work electricity for obtaining control and protection unit by DC/DC
Pressure；
Logic control module, for carrying out logic judgment based on digital circuit or analog logic circuit according to input signal,
The gate pole control signal and first of the first and second electronic power switches and electric discharge electronic switch is generated to third relay
Control signal, adjust working condition；
Communication module, using communication chips such as RS485 or CAN, for realizing controlled with higher level, the communication of battery BMS；
Multiple drive modules are converted to the driving signal with certain power for that will control signal.
Wherein, it after the Logic control module detects that cell voltage (V1) is greater than cell voltage protection threshold value, will send out
Bypass commands out execute charged state to bypass condition conversion process, battery are exited, protect battery；
After the Logic control module detects that electric current (I) is greater than discharge current protection threshold value, bypass commands will be issued,
Discharge condition is executed to bypass condition conversion process, battery is exited, protects battery；
When the control and protection unit detect cell voltage (V1) in a certain range be greater than cell voltage rated value, but
When being not above cell voltage protection threshold value, conducting electric discharge discharges to battery by resistance (R3) with electronic switch (G3),
Cell voltage is reduced to normal working range.
Second aspect, the application provide a kind of battery pack, including multiple battery modules, multiple battery modules flexibilities connect
Connect protective device and a DC/AC bidirectional converter, it is characterised in that the multiple battery modules pass through the multiple battery mould
Group flexible connection protective device is sequentially connected in series, and the output of the battery modules combination obtained after series connection is two-way by the DC/AC
Current transformer is converted to alternating current.
Preferably, the dynamic voltage balancing electric capacity C1 and dynamic voltage balancing resistance R1 in each battery modules flexible connecting device
Parameter is all identical.
This scheme can solve the problems, such as the flexible connection of battery modules very well, realize the same of overvoltage and overcurrent protection
When, also there is balance control function, to realize the retired battery modules of differentiation in groups and realize that echelon battery utilizes.
Detailed description of the invention
Fig. 1 is the circuit diagram of battery modules flexible connection protective device according to an embodiment of the present invention；
Fig. 2 is the structure chart for the control and protection unit being flexibly connected in protective device according to the battery modules of Fig. 1；
Fig. 3 is the schematic diagram that multiple battery modules are connected using the battery modules flexible connection protective device of Fig. 1.
Specific embodiment
Now with reference to the attached drawing specific embodiment that the present invention will be described in detail conceives.
Referring to Fig. 1, battery modules flexible connection protective device includes: dynamic voltage balancing resistance R1, sampling resistor R2, electric discharge electricity
Hinder R3, dynamic voltage balancing electric capacity C1, electric discharge electronic switch G3, electronic power switch G1 and its anti-paralleled diode being internally integrated
D1, electronic power switch G2 and its it is internally integrated anti-paralleled diode D2, relay K1, K2, K3 and control and protection unit.Its
In, one end of dynamic voltage balancing resistance R1 is connected with the anode of battery, and the other end is connected with dynamic voltage balancing electric capacity C1；Sampling resistor R2
One end be connected with the anode of battery, the other end is connected with relay K1 and relay K3；One end of discharge resistance R3 and battery
Anode be connected, the other end is connected with the drain electrode of electronic switch G3 with discharging；One end of dynamic voltage balancing electric capacity C1 and dynamic voltage balancing
Resistance R1 is connected, and the other end is connected with the cathode of battery；Electric discharge is connected with the drain electrode of electronic switch G3 with discharge resistance R3, source electrode
It is connected with the cathode of battery；The drain electrode of electronic power switch G1 is connected with relay K3, the drain electrode phase of source electrode and electronic switch G2
Even；The source electrode of electronic power switch G2 is connected with the cathode of battery, and drain electrode is connected with the drain electrode of electronic power switch G1；Relay
One end of K1 is connected with sampling resistor R2 and relay K3, the source electrode and electricity of the other end and relay K2, electronic power switch G1
The drain electrode of power electronic switch G2 is connected；One end and relay K1 of relay K2, the source electrode of electronic power switch G1 and electric power electricity
The drain electrode of sub switch G2 is connected, and the other end is connected with the cathode of battery；One end of relay K3 is connected with sampling resistor R2, another
End is connected with the drain electrode of electronic power switch G1；The first port and second port of the control and protection unit are electric with sampling respectively
The both ends for hindering R2 are connected, and third port is connected with the cathode of battery, by first to third port the control are protected single
The input of member is the end voltage V2 of cell voltage V1 and sampling resistor R2.The charge and discharge of the battery modules flexible connection protective device
The first and second ports for being electrically accessed end are connected to the both ends of the second relay K2 to realize that the battery modules flexibility connects
Connect the charging/discharging function of protective device.
In Fig. 1 battery modules flexible connection protective device have at work there are three working condition, be respectively: charge and discharge
State, bypass condition and equalizing voltage state, under different working condition, the combinations of states of each circuit element is referring to table 1.
Table 1
| K1 | K2 | K3 | G1 | G2 | G3 | State |
| Closure | It disconnects | It disconnects | It disconnects | It disconnects | It disconnects | Charge and discharge |
| It disconnects | Closure | It disconnects | It disconnects | It disconnects | It disconnects | Bypass |
| It disconnects | Closure | It disconnects | It disconnects | It disconnects | Closure | Equalizing voltage |
Charging and discharging state: K1 closure, other switches disconnect, and battery is in charge and discharge state.Wherein, battery is in and fills
When electricity condition, electric current flows into battery-end, V2 > 0.When battery is in discharge condition, electric current flows out battery, and V2 < 0, V2 are samplings
The voltage at the both ends resistance R2.
Bypass condition: K2 closure, other switches disconnect.Bypass condition can be used for protecting battery or replacement battery.
Equalizing voltage state: electric discharge is closed with electronic switch G3, and K2 closure, other switches disconnect.Work as battery terminal voltage
It is battery discharge by discharge resistance R3 more than setting value, reduces battery terminal voltage to allowed band.
The battery modules flexible connection protective device can also be in charging and discharging state, bypass condition and equalizing voltage state
Between convert, conversion process is as follows:
1, charged state is converted to from bypass condition:
It is closed K3 → conducting G2 → disconnection K2 → shutdown G2 → closure K1 → disconnection K3, conversion process is completed.Conversion process
In, D1 and G2 (more than ten milliseconds) conductings in short-term are not necessarily to radiator.
2, discharge condition is converted to from bypass condition:
It is closed K3 → disconnection K2 → conducting G1 → closure K1 → shutdown G1, conversion process is completed.In conversion process, D2 and G1
(more than ten milliseconds) conductings in short-term are not necessarily to radiator.
3, the conversion process between charging and discharging state:
K1 closed state is in when due to filling and (putting) electricity, charge and discharge are converted nature and carried out.
4, charged state is converted to bypass condition:
It is closed K3 → disconnection K1 → conducting G2 → closure K2 → shutdown G2 → disconnection K3, conversion process is completed.
5, discharge condition is converted to bypass condition:
It is closed K3 → conducting G1 → disconnection K1 → shutdown G1 → closure K2 → disconnection K3, conversion process is completed.
Wherein, it is in by the polarity discriminating battery of V2 and is charged or discharged state.When V2 is timing, charged state；When
When V2 is negative, discharge condition.
Between multiple states in conversion process, dynamic voltage balancing electric capacity C1 can play the role of burning voltage.
Fig. 2 is the structure chart of the control and protection unit in the battery modules flexible connection protective device of Fig. 1, control protection
Unit can realize that input is the end voltage V2 of cell voltage V1, sampling resistor R2 based on digital circuit or analog logic circuit,
Output is electronic power switch G1, G2, the gate pole control signal of electric discharge electronic switch G3 draws, g2, g3；Relay K1, K2, K3
Control signal k1, k2, k3.The control and protection unit is divided by function following functions module:
Battery voltage threshold judgment module carries out voltage threshold judgement；
Battery charging and discharging electric current I threshold value judgment module detects the end voltage V2 of sampling resistor R2, carries out current threshold and sentences
It is disconnected；
Power module connects cell voltage V1, the operating voltage for obtaining control and protection unit is converted by DC/DC, generally
For 5V；
Logic control module carries out logic judgment based on digital circuit or analog logic circuit, generates according to input signal
The control signal of electronic power switch and relay adjusts working condition；
Communication module is realized and higher level's control, the communication of battery BMS using communication chips such as RS485 or CAN；
Control signal is converted to the driving signal with certain power by multiple drive modules.
After Logic control module detects that cell voltage V1 is greater than cell voltage protection threshold value, bypass commands will be issued,
Charged state is executed to bypass condition conversion process, battery is exited, protects battery.
After Logic control module detects that electric current I is greater than discharge current protection threshold value, bypass commands will be issued, execution is put
Electricity condition exits battery to bypass condition conversion process, protects battery.
When control and protection unit detects that cell voltage V1 is greater than cell voltage rated value in a certain range, but without super
When crossing cell voltage protection threshold value, electric discharge electronic switch G3 is connected, is discharged by resistance R3 battery, reduces battery electricity
It is pressed onto normal working range.
Preferably, the main components of the flexible connection protective device are as follows::
Dynamic voltage balancing resistance R1 selects 10 Ohmic power resistance；
Dynamic voltage balancing electric capacity C1 selects the thin-film capacitor of 100V 8000uF；
Sampling resistor R2 selects high-power alloy sampling resistor 0.05m Ω；
Discharge resistance R3 selects 100 Ω of high-power resistance；
Electric discharge is all made of the Mosfet of 150V/120A with electronic switch G3, electronic power switch G1, G2；
Relay K1, K2, K3, using 200A magnetic latching relay；
Control and protection unit, using the control and protection unit based on digital processing chip.
Fig. 3 is the schematic diagram that multiple battery modules are connected using the battery modules flexible connection protective device of Fig. 1.For example,
There are 14 retired battery modules, each port DC voltage is 48V.By 14 flexible connection protective devices by 14 retired electricity
Chi Mo group is cascaded, and may be constructed 0~672 DC voltage port, is then converted to by DC/AC bidirectional converter
AC380V alternating current.Wherein, the bidirectional converter of DC 672V/AC380V is conventional products in industry market.
When multiple battery modules by flexible connection protective device series winding when, the dynamic voltage balancing electric capacity C1 of multiple same parameters and
Dynamic voltage balancing resistance R1 can play the role of average voltage distribution.
The application's has the beneficial effect that
Bypass and access (charge and discharge) state conversion are exited by control, realizes the flexible connection of battery modules, so as to
Enough realize that complete machine does not replace battery modules under shutdown status；
Switch to bypass escape mechanism by control, realizes overcurrent to battery modules, overvoltage protection；
The uniform voltage function when series connection of multiple battery modules can be realized by dynamic voltage balancing electric capacity；
Balance control function can be realized by the voltage of control of discharge regulating cell mould group；
Flexible connection can be compatible with different types of battery modules simultaneously and use in groups；
Standardized structural, control is simple, at low cost；
The retired battery modules that can be realized differentiation in groups, realize that echelon battery utilizes；
This scheme can solve the problems, such as the flexible connection of battery modules very well, be to solve 12V or 48V normal cell mould group such as
What is converted to mains 380V preferred version.
Above embodiments are merely to illustrate the present invention, and not limitation of the present invention, the common skill in relation to technical field
Art personnel can also make a variety of changes and modification without departing from the spirit and scope of the present invention, therefore all etc.
Same technical solution also belongs to scope of the invention, and scope of patent protection of the invention should be defined by the claims.
Claims (9)
1. a kind of battery modules are flexibly connected protective device characterized by comprising dynamic voltage balancing resistance (R1), sampling resistor
(R2), discharge resistance (R3), dynamic voltage balancing electric capacity (C1), electric discharge with electronic switch (G3), the first electronic power switch (G1) and
The anti-paralleled diode that it anti-paralleled diode being internally integrated (D1), the second electronic power switch (G2) and its is internally integrated
(D2), the first relay (K1), the second relay (K2), third relay (K3) and control and protection unit；
Wherein,
One end of the dynamic voltage balancing resistance (R1) is connected with the anode of battery, and the other end is connected with dynamic voltage balancing electric capacity (C1)；
One end of the sampling resistor (R2) is connected with the anode of battery, the other end and the first relay (K1) and third relay
(K3) it is connected；
One end of the discharge resistance (R3) is connected with the anode of battery, and the other end uses the drain electrode phase of electronic switch (G3) with electric discharge
Even；
One end of the dynamic voltage balancing electric capacity (C1) is connected with dynamic voltage balancing resistance (R1), and the other end is connected with the cathode of battery；
The drain electrode of first electronic power switch (G1) is connected with third relay (K3), source electrode and the second electronic power switch
(G2) drain electrode is connected；
The source electrode of second electronic power switch (G2) is connected with the cathode of battery, drain electrode and the first electronic power switch (G1)
Source electrode be connected；
The electric discharge is connected with the drain electrode of electronic switch (G3) with discharge resistance (R3), and source electrode is connected with the cathode of battery；
One end of first relay (K1) is connected with sampling resistor (R2), the other end and the second relay (K2), the first electricity
The drain electrode of the source electrode and the second electronic power switch (G2) of power electronic switch (G1) is connected；
The source electrode and second of one end of second relay (K2) and the first relay (K1), the first electronic power switch (G1)
The drain electrode of electronic power switch (G2) is connected, and the other end is connected with the cathode of battery；
One end of the third relay (K3) is connected with sampling resistor (R2), the other end and the first electronic power switch (G1)
Drain electrode is connected；
The first port and second port of the control and protection unit are connected with the both ends of sampling resistor (R2) respectively, third port
Be connected with the cathode of battery, by first to third port make the control and protection unit input be cell voltage (V1) and
The end voltage (V2) of sampling resistor (R2)；The output of the control and protection unit be the first electronic power switch (G1), second electricity
Power electronic switch (G2), electric discharge control signal and the first relay (K1), the second relay with the gate pole of electronic switch (G3)
(K2), the control signal of third relay (K3)；
First and second ports of the charge and discharge incoming end of the battery modules flexible connection protective device are connected to second
The both ends of relay (K2) are to realize that the battery modules are flexibly connected the charging/discharging function of protective device.
2. battery modules according to claim 1 are flexibly connected protective device, it is characterised in that:
The dynamic voltage balancing resistance (R1) is power resistor；
The dynamic voltage balancing electric capacity (C1) is thin-film capacitor；
The sampling resistor (R2) is milliohm pole sampling resistor；
The discharge resistance (R3) is power resistor；
First electronic power switch (G1), the second electronic power switch (G2) and electric discharge are with electronic switch (G3)
Mosfet；
First relay (K1), the second relay (K2) and third relay (K3) are magnetic latching relay.
3. battery modules according to claim 1 are flexibly connected protective device, it is characterised in that:
The control and protection unit is based on digital circuit or analog logic circuit is realized.
4. battery modules according to claim 1 are flexibly connected protective device, it is characterised in that:
The control and protection unit is realized based on digital processing chip.
5. battery modules according to claim 1 are flexibly connected protective device, it is characterised in that: the battery modules are flexible
Connecting protective device has following working condition:
Charging and discharging state: the first relay (K1) closure, other switches disconnect；
Bypass condition: the second relay (K2) closure, other switches disconnect；
Equalizing voltage state: electric discharge is closed with electronic switch (G3), and the second relay (K2) closure, other switches disconnect.
6. battery modules according to claim 5 are flexibly connected protective device, it is characterised in that: the control and protection unit
Including following functions module:
Battery voltage threshold judgment module, for carrying out voltage threshold judgement；
Battery charging and discharging current threshold judgment module carries out current threshold for detecting the end voltage (V2) of sampling resistor (R2)
Judgement；
Power module connects cell voltage (V1), for converting the operating voltage for obtaining control and protection unit by DC/DC；
Logic control module, for carrying out logic judgment based on digital circuit or analog logic circuit, generating according to input signal
The gate pole of first and second electronic power switches and electric discharge electronic switch control signal and first to third relay control
Signal processed adjusts working condition；
Communication module, using RS485 or CAN communication chip, for realizing controlled with higher level, the communication of battery BMS；
Multiple drive modules are converted to the driving signal with certain power for that will control signal.
7. battery modules according to claim 6 are flexibly connected protective device, it is characterised in that:
The Logic control module carries out logic judgment according to input signal, based on digital circuit or analog logic circuit, generates
The gate pole of first and second electronic power switches and electric discharge electronic switch control signal and first to third relay control
Signal processed adjusts working condition specifically:
After the Logic control module detects that cell voltage (V1) is greater than cell voltage protection threshold value, bypass life will be issued
It enables, executes charged state to bypass condition conversion process, battery is exited, protect battery；
After the Logic control module detects that electric current (I) is greater than discharge current protection threshold value, bypass commands will be issued, are executed
Discharge condition exits battery to bypass condition conversion process, protects battery；
When the control and protection unit detects that cell voltage (V1) is greater than cell voltage rated value, but it is not above cell voltage
When protecting threshold value, conducting electric discharge discharges to battery by resistance (R3) with electronic switch (G3), reduces cell voltage to just
Normal working range.
8. a kind of battery pack, including the flexible connection of multiple battery modules, multiple battery modules as described in claim any one of 1-7
Protective device and a DC/AC bidirectional converter, it is characterised in that the multiple battery modules pass through the multiple battery modules
Flexible connection protective device is sequentially connected in series, and the output of the battery modules combination obtained after series connection passes through the two-way change of the DC/AC
Stream device is converted to alternating current.
9. battery pack according to claim 8, which is characterized in that dynamic in each battery modules flexible connecting device
State equalizing capacitance (C1) and dynamic voltage balancing resistance (R1) parameter are all identical.
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| CN110954839A (en) * | 2019-12-19 | 2020-04-03 | 肇庆理士电源技术有限公司 | Control method, system, equipment and storage medium for discharge detection of storage battery |
| CN111816941A (en) * | 2020-07-22 | 2020-10-23 | 兰州兰石恩力微电网有限公司 | Energy storage integrated system of retired lithium iron phosphate power battery |
| CN114865756B (en) * | 2022-07-11 | 2022-10-11 | 浙江大学 | Battery energy storage system, control method, energy storage system and computer equipment |
| CN116388345B (en) * | 2023-06-01 | 2023-08-11 | 西安为光能源科技有限公司 | Battery PACK circuit system and control method |
| CN116995788B (en) * | 2023-09-28 | 2024-01-23 | 苏州清研精准汽车科技有限公司 | Charging and discharging equipment for detecting battery module and battery module detection method |
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