CN106026244B - Lithium ion battery charge-discharge protection circuit and lithium-ion battery systems - Google Patents
Lithium ion battery charge-discharge protection circuit and lithium-ion battery systems Download PDFInfo
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- CN106026244B CN106026244B CN201610409354.0A CN201610409354A CN106026244B CN 106026244 B CN106026244 B CN 106026244B CN 201610409354 A CN201610409354 A CN 201610409354A CN 106026244 B CN106026244 B CN 106026244B
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 180
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 238000007599 discharging Methods 0.000 claims abstract description 12
- 238000004804 winding Methods 0.000 claims description 19
- 230000001681 protective effect Effects 0.000 claims description 17
- 230000002265 prevention Effects 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 13
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 8
- 229910052744 lithium Inorganic materials 0.000 description 8
- 239000004065 semiconductor Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 238000009831 deintercalation Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
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- H02J7/0026—
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a kind of lithium ion battery charge-discharge protection circuit, including MOS switch unit, the charge and discharge protecting unit and D.C. contactor unit being connected with MOS switch unit.Charge and discharge protecting unit of the invention carries out real time data acquisition and judgement relatively to Li-ion batteries piles and exports control signal, when the abnormal conditions such as overcharging or overdischarging occur in Li-ion batteries piles, exports the control signal that charging is abnormal or electric discharge is abnormal；MOS switch unit controls D.C. contactor unit according to the control signal to disconnect or be connected charging and discharging circuit, plays the role of protecting Li-ion batteries piles.Simultaneously as D.C. contactor can be by very big operating current, thus this circuit is suitable for the lithium-ion battery systems of hundred amperes or more high current charge-discharges.
Description
Technical field
The present invention relates to battery charging and discharging protection technique field more particularly to a kind of lithium ion battery charge-discharge protection circuits
And lithium-ion battery systems.
Background technique
Lithium ion battery is a kind of secondary cell (rechargeable battery), is mainly moved between a positive electrode and a negative electrode by lithium ion
It moves and carrys out work.In charge and discharge, Li+ insertion and deintercalation back and forth between bipolarity end, when charging, Li+ passes through from positive deintercalation
Electrolyte is embedded in cathode, and cathode is in lithium-rich state；It is then opposite when electric discharge.Lithium ion battery is in consumer electronics field and power
The electrical energy storage device that energy storage field is used widely, to prevent when overcharging or overdischarging phenomenon occurs for non-normal use
It causes the damage of lithium ion battery that safety accident even occurs, has protection circuit in actual use in lithium ion battery, protect
Circuit usually has the function of additives for overcharge protection, over etc..
Currently, lithium ionic battery protection circuit mainly includes being detected for voltage, the electric current to lithium ion battery
Decision circuit (usually IC chip and resistance capacitance) and switch element for turning off/being connected charging and discharging circuit are (usually
Metal-oxide-semiconductor).When lithium ion battery or in which certain single battery occur abnormal, the chip in decision circuit passes through the electricity being collected into
Pressure, current information provide judgements, export different control signals in corresponding controling end to control the shutdown of corresponding metal-oxide-semiconductor and charge/
Discharge loop, and then protect lithium ion battery safety.
In recent years, lithium ion battery the fields such as automobile starting battery, electric car and energy storage extensive use, and consumption
Unlike field, the lithium ion battery electric current in these application fields may be up to hundred ampere levels or higher, single at this time
A metal-oxide-semiconductor is unable to satisfy the requirement that high current passes through.As shown in Figure 1, for low current (tens of amperes of electricity of such as electric bicycle
Stream) rank lithium ion battery, the mode of more metal-oxide-semiconductor parallel connections is generallyd use to solve, but for hundreds of amperes or more high current
Protection circuit, in parallel using more metal-oxide-semiconductor M1 ~ Mn, not only bulky, cost is high in this way, but also short-circuit or very big
It is easy to lead to problems such as part metal-oxide-semiconductor burn because electric current distribution is unbalanced when electric current flows through.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, providing a kind of lithium ion battery
Charge-discharge protection circuit and lithium-ion battery systems.
The technical solution adopted by the present invention to solve the technical problems is: it is according to an aspect of the present invention, a kind of lithium is provided
Ion battery charge-discharge protection circuit, including the charge and discharge protecting unit being connected with Li-ion batteries piles, be connected to the input/
The D.C. contactor unit of the charging and discharging circuit of output and Li-ion batteries piles, and contacted with charge and discharge protecting unit, direct current
The connected MOS switch unit of device unit.Preferably, it is real-time to carry out data to Li-ion batteries piles for the charge and discharge protecting unit
It acquires and judges relatively and export control signal；MOS switch unit is disconnected according to control signal control D.C. contactor unit
Or conducting charging and discharging circuit.
Preferably, the charge and discharge protecting unit include the Li-ion Battery Protective Chip being connected with Li-ion batteries piles and
Resistance capacitance element, Li-ion Battery Protective Chip include that the voltage for carrying out real time data acquisition to Li-ion batteries piles is defeated
Enter end, the charge control end CO for exporting the control signal that control is charged, control putting for the control signal to discharge for exporting
Electric control end DO, and the triggering end VM for carrying out real time signal aquisition to input/output.
Preferably, the MOS switch unit includes that MOS switch M1 and MOS switch M2 and one end and MOS switch M2 go here and there
The electric discharge that connection and the other end are connected with a polar end of Li-ion batteries piles starts switch S1；Wherein, the electric discharge starts switch
S1 is the electronic switch that electric signal control is provided by electrical equipment.
Preferably, the D.C. contactor unit includes the polarity that series winding is connected to input/output and Li-ion batteries piles
The D.C. contactor K1 comprising driving coil L1 between the end and D.C. contactor K2 comprising driving coil L2, and and direct current
The diode D2 of contactor K2 parallel connection；The driving coil L1 and MOS switch M1 series winding is connected to the positive terminal P of input/output 300
+ between negative pole end P-；Driving coil L2, MOS switch M2 and electric discharge start switch S1 series winding and are connected to Li-ion batteries piles 200
Between positive terminal B+ and negative pole end B-.
Preferably, the D.C. contactor K1 is normally closed type D.C. contactor, and D.C. contactor K2 is that direct current open in usual connects
Tentaculum.
Preferably, the Li-ion Battery Protective Chip of the charge and discharge protecting unit is the lithium ion battery of negative pole structure altogether
Chip is protected, D.C. contactor unit further includes the diode D1 in parallel with D.C. contactor K1；Wherein, D.C. contactor K1 and
D.C. contactor K2 series winding is connected between the positive terminal P+ of input/output and the positive terminal B+ of Li-ion batteries piles；Two pole
The cathode of pipe D1 is connected with the positive terminal P+ of input/output, the positive terminal B+ phase of the cathode and Li-ion batteries piles of diode D2
Even；Triggering end VM is connected with the positive terminal P+ of input/output.
Preferably, the MOS switch M1 is NMOS tube, and MOS switch M2 is PMOS tube, the grid of MOS switch M1 and charging
Control terminal CO is connected, and the drain electrode of MOS switch M1 is connected with driving coil L1, the source electrode of MOS switch M1 and the cathode of input/output
P- is held to be connected；The grid of MOS switch M2 is connected with discharge control terminal DO, and the source electrode of MOS switch M2 is connected with driving coil L2,
The drain electrode of MOS switch M2 starts switch the one end S1 with electric discharge and is connected, and electric discharge starts switch the S1 other end and Li-ion batteries piles
Negative pole end B- is connected.
Preferably, the Li-ion Battery Protective Chip of the charge and discharge protecting unit is the lithium ion battery of anode structure altogether
Chip is protected, D.C. contactor unit further includes the diode D1 in parallel with D.C. contactor K1；Wherein, the D.C. contactor
K1 and D.C. contactor K2 series winding is connected between the negative pole end P- of input/output and the negative pole end B- of Li-ion batteries piles；It is described
The anode of diode D1 is connected with the negative pole end P- of input/output, the negative pole end of the anode and Li-ion batteries piles of diode D2
B- is connected；Triggering end VM is connected with the negative pole end P- of input/output.
Preferably, the MOS switch M1 is PMOS tube, and MOS switch M2 is NMOS tube；Wherein, the grid of MOS switch M1 with
The charge control end CO other end is connected, and the negative pole end P- of drain electrode with the input/output of MOS switch M1 is connected, MOS switch M1's
Source electrode is connected with driving coil L1；The grid of MOS switch M2 is connected with the discharge control terminal DO other end, the source electrode of MOS switch M2
It starts switch the one end S1 with electric discharge to be connected, the drain electrode of MOS switch M2 is connected with driving coil L2；Electric discharge starts switch the S1 other end
It is connected with the negative pole end B- of Li-ion batteries piles.
According to another aspect of the present invention, a kind of lithium-ion battery systems are provided, including Li-ion batteries piles and above-mentioned
Lithium ion battery charge-discharge protection circuit, the lithium ion battery charge-discharge protection circuit and Li-ion batteries piles are arranged one
It rises.
The technical solution for implementing lithium ion battery charge-discharge protection circuit of the present invention, have the following advantages that or the utility model has the advantages that
The charge and discharge protecting unit of lithium ion battery charge-discharge protection circuit of the present invention carries out real time data acquisition to Li-ion batteries piles
And judgement relatively and exports control signal and provides and fill when the abnormal conditions such as overcharging or overdischarging occur in Li-ion batteries piles
The control signal of electrical anomaly or electric discharge exception；MOS switch unit controls D.C. contactor unit according to the control signal to disconnect
Or conducting charging and discharging circuit, play the role of protecting Li-ion batteries piles, since D.C. contactor can pass through very big work
Electric current, thus this circuit is suitable for the lithium ion battery of hundred amperes or more high current charge-discharges.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it is therefore apparent that drawings in the following description are only some embodiments of the invention, for ability
For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached
Scheme, in attached drawing:
Fig. 1 is the circuit diagram of the battery charge/discharge protection circuit of more metal-oxide-semiconductor parallel connections of the prior art；
Fig. 2 is the circuit diagram of lithium ion battery charge-discharge protection circuit first embodiment of the present invention；
Fig. 3 is the circuit diagram of lithium ion battery charge-discharge protection circuit second embodiment of the present invention；
Fig. 4 is the circuit diagram of lithium ion battery charge-discharge protection circuit 3rd embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, the various implementations that will be described below
Example will refer to corresponding attached drawing, these attached drawings constitute a part of embodiment, and which describe realization, the present invention may be adopted
Various embodiments.It should be appreciated that other embodiments also can be used, or circuit and function are carried out to embodiment enumerated herein
Modification on energy, without departing from the scope of the present invention and essence.
The present invention provides the various embodiments of lithium ion battery charge-discharge protection circuit, embodiment is only a special case,
The present invention just only in this way several implementations are not indicated.
Embodiment one:
As shown in Fig. 2, lithium ion battery charge-discharge protection circuit of the present invention, including what is be connected with Li-ion batteries piles 200
Charge and discharge protecting unit 10 is connected to the D.C. contactor of the charging and discharging circuit of input/output 300 and Li-ion batteries piles 200
Unit 30, and the MOS switch unit 20 being connected with charge and discharge protecting unit 10, D.C. contactor unit 30.Wherein, charge and discharge
Electric protection unit 10 carries out real time data acquisition and judgement relatively to Li-ion batteries piles 200 and exports control signal；MOS switch
Unit 20 is returned according to control signal control D.C. contactor unit 30 to disconnect or be connected the charge and discharge to Li-ion batteries piles 200
Road.
The charge and discharge protecting unit of lithium ion battery charge-discharge protection circuit of the present invention carries out data to Li-ion batteries piles
It acquires in real time and judges relatively and export control signal, when the abnormal conditions such as overcharging or overdischarging occur in Li-ion batteries piles
When, the control signal of output charging exception or electric discharge exception；MOS switch unit is according to different control signal control direct current contacts
Device unit disconnects or is connected the charging and discharging circuit to Li-ion batteries piles, plays the role of protecting Li-ion batteries piles.Meanwhile
Since D.C. contactor can be by very big operating current, thus this circuit is suitable for the lithium of hundred amperes or more high current charge-discharges
Ion battery.
Specifically, the charge and discharge protecting unit 10 of lithium ion battery charge-discharge protection circuit of the present invention includes and lithium-ion electric
The connected Li-ion Battery Protective Chip of pond group 200 (not shown go out) and resistance capacitance element (not shown go out), the lithium-ion electric
It includes for Li-ion batteries piles 200 to be carried out with the voltage input end 11 of real time data acquisition, for exporting control that chip is protected in pond
Charge control end CO, the discharge control terminal DO for controlling signal for exporting control electric discharge for making the control signal of charging, and
For carrying out the triggering end VM of real time signal aquisition to input/output 300.Triggering end VM is used to carry out input/output 300
Real time signal aquisition, Li-ion Battery Protective Chip are defeated according to the signal of acquisition adjustment charge control end CO and discharge control terminal DO
Control signal out, i.e. control charge control end CO or discharge control terminal DO output control signal, make lithium ion battery charge and discharge
Circuit is protected to restore normal condition.More specifically, the quantity of the single battery of Li-ion batteries piles 200 can for 1 to N number of,
When only one single battery of Li-ion batteries piles 200, i.e., Li-ion batteries piles 200 are lithium ion battery；Work as lithium-ion electric
When pond group 200 has multiple single batteries, i.e., Li-ion batteries piles 200 are Li-ion batteries piles.
Specifically, the MOS switch unit 20 of lithium ion battery charge-discharge protection circuit of the present invention include MOS switch M1 and
MOS switch M2 and one end are connected with MOS switch M2 and the other end is put with what a polar end of Li-ion batteries piles 200 was connected
Electric switch S1.Preferably, it is that the electronic switch of electric signal control is provided by electrical equipment (as certainly which, which starts switch S1,
Dynamic MOS switch), being also possible to one, (electric discharge of such as automobile starting power supply is opened by the electric discharge starting electric switch of user's manual control
Dynamic switch) etc..
Specifically, the D.C. contactor unit 30 of lithium ion battery charge-discharge protection circuit of the present invention is connected to defeated including series winding
Enter/export the D.C. contactor K1 comprising driving coil L1 between 300 and a polar end of Li-ion batteries piles 200 and comprising
The D.C. contactor K2 of driving coil L2, the diode D1 in parallel with D.C. contactor K1, and it is in parallel with D.C. contactor K2
Diode D2；Wherein, diode D2 positive terminal is identical as charging current direction；Driving coil L1 and MOS switch M1 series winding connects
Between the positive terminal P+ and negative pole end P- of input/output 300；Driving coil L2, MOS switch M2 and electric discharge start switch S1 string
It is connected between the positive terminal B+ of Li-ion batteries piles 200 and negative pole end B-.Preferably, D.C. contactor K1 is normally closed type direct current
Contactor, D.C. contactor K2 are D.C. contactor open in usual.
The charge and discharge protecting unit of lithium ion battery charge-discharge protection circuit of the present invention is protected using different lithium ion batteries
Chip is protected, so that the present invention has entirely different circuit connection structure, specifically, Li-ion Battery Protective Chip can be negative altogether
The Li-ion Battery Protective Chip of pole structure or the altogether Li-ion Battery Protective Chip of anode structure, it is specific such as embodiment two and real
Example three is applied to introduce respectively.
Embodiment two:
As shown in figure 3, in the present embodiment lithium ion battery charge-discharge protection circuit, the lithium of charge and discharge protecting unit 10 from
Sub- battery protection chip is the Li-ion Battery Protective Chip of negative pole structure altogether, and D.C. contactor unit 30 further includes connecing with direct current
The diode D1 of tentaculum K1 parallel connection, at this point, the MOS switch M1 of MOS switch unit 20 is NMOS tube, MOS switch M2 is PMOS tube；
Its corresponding lithium ion battery charge-discharge protection circuit specifically: charge and discharge protecting unit 10 is connected to Li-ion batteries piles 200
Positive terminal B+ and negative pole end B-(, that is, bipolarity end) between, D.C. contactor unit 30 is connected to the positive terminal P of input/output
+ and positive terminal B+(, that is, same polar end) between, MOS switch unit 20 and charge and discharge protecting unit 10, D.C. contactor unit
30 are connected.Wherein, charge and discharge protecting unit 10 carries out data sampling and judgement relatively to Li-ion batteries piles 200 and exports control
Signal processed；MOS switch unit 20 controls D.C. contactor unit 30 according to the control signal to disconnect or be connected to lithium-ion electric
The charging and discharging circuit of pond group 200.
In the present embodiment, D.C. contactor K1 and D.C. contactor K2 series winding is connected to the positive terminal P+ of input/output 300
Between the positive terminal B+ of Li-ion batteries piles 200；The cathode of diode D1 is connected with the positive terminal P+ of input/output 300, and two
The cathode of pole pipe D2 is connected with the positive terminal B+ of Li-ion batteries piles 200；The positive terminal P+ of triggering end VM and input/output 300
It is connected；Driving coil L1 and MOS switch M1 series winding is connected between the positive terminal P+ of input/output 300 and negative pole end P-；Drive line
Circle L2, MOS switch M2 and electric discharge start switch S1 series winding be connected to Li-ion batteries piles 200 positive terminal B+ and negative pole end B- it
Between.
Specifically, the one end driving coil L1 is connected with the positive terminal P+ of input/output 300；The one end driving coil L2 and lithium
The positive terminal B+ of ion battery group 200 is connected；The grid of MOS switch M1 is connected with charge control end CO, the drain electrode of MOS switch M1
It is connected with the driving coil L1 other end, the source electrode of MOS switch M1 is connected with the negative pole end P- of input/output 300；MOS switch M2
Grid be connected with discharge control terminal DO, the source electrode of MOS switch M2 is connected with the driving coil L2 other end, the leakage of MOS switch M2
Pole starts switch the one end S1 with electric discharge and is connected, and electric discharge starts switch negative pole end B- phase of the S1 other end with Li-ion batteries piles 200
Even.
The present embodiment lithium ion battery charge-discharge protection circuit is specifically divided into charge protection process and discharge prevention process.
During charge protection: input/output 300 at this time is charging unit, when Li-ion batteries piles 200 are in just
When normal charged state, the charge control end CO of charge and discharge protecting unit 10 exports low level signal, MOS in MOS switch unit 20
Switch M1 is in an off state, and does not have electric current to flow through in driving coil L1, and D.C. contactor K1 is in normally off, charging unit
It is charged by D.C. contactor K1 and diode D2 to Li-ion batteries piles 200；When some single battery in charging process
Or the voltage of all single batteries is more than when presetting to overcharge protection voltage, the charge control end CO of charge and discharge protecting unit can be exported
High level signal, at this point, the control signal of the high level can control MOS switch M1 conducting, a smaller current flows through driving line
It encloses L1 to disconnect the normally closed type contact D.C. contactor K1, cuts off the charging current to Li-ion batteries piles 200 at once.It drives at this time
The electric current flowed through in coil L1 is derived from charging unit (external charging power supply), will not consume the electric energy of Li-ion batteries piles 200, real
Now to the additives for overcharge protection of Li-ion batteries piles 200.
During discharge prevention: input/output 300 at this time is electrical equipment (such as electric car), when starting should
When electrical equipment, i.e., S1 star t-up discharge circuit is started switch by electric discharge.When Li-ion batteries piles 200 do not need electric discharge, put
Electric switch S1 is to disconnect, and no electric current flows through driving coil L2, and D.C. contactor K2 is normally opened, thus discharge loop is in
Off state；When needing to discharge, electric discharge starts switch S1 closure, when Li-ion batteries piles 200 are in normal condition, charge and discharge
The discharge control terminal DO of electric protection unit 10 will export low level signal, and MOS switch M2 is in the conductive state, in driving coil L2
There is electric current to flow through, the normally opened contact closure of D.C. contactor K2, Li-ion batteries piles 200 pass through D.C. contactor K2 and normally closed shape
The D.C. contactor K1 of state discharges to electrical equipment；When charge and discharge protecting unit 20 detects some monomer in discharge process
When battery or entire battery voltage are lower than default over voltage, high level signal will be exported in discharge control terminal DO,
The control signal control MOS switch M2 of the high level is disconnected, and the electric current for flowing through driving coil L2 is cut off, and D.C. contactor K2 is extensive
Multiple normally open is cut off the discharge current of electrical equipment, and then Li-ion batteries piles 200 is protected not damage because of overdischarge
It is bad.The electric current for flowing through driving coil L2 in the on-state will be derived from Li-ion batteries piles 200, the electric current and discharge process it is big
Energy loss caused by electric current is compared can be ignored, and realize the over to Li-ion batteries piles 200.
The present embodiment working principle is the same as example 1, and details are not described herein for other same part, and detailed content please join
See embodiment one.
Embodiment three:
As shown in figure 4, in the present embodiment lithium ion battery charge-discharge protection circuit, the lithium of charge and discharge protecting unit 10 from
Sub- battery protection chip is the Li-ion Battery Protective Chip of anode structure altogether, and D.C. contactor unit 30 further includes connecing with direct current
The diode D1 of tentaculum K1 parallel connection, at this point, the MOS switch M1 of MOS switch unit 20 is PMOS tube, MOS switch M2 is NMOS tube；
Its corresponding lithium ion battery charge-discharge protection circuit specifically: charge and discharge protecting unit 10 is connected to and Li-ion batteries piles
Between 200 positive terminal B+ and negative pole end B-, MOS switch unit 20 and the series winding of D.C. contactor unit 30 are connected to input/output
Between 300 negative pole end P- and the negative pole end B- of Li-ion batteries piles 200, MOS switch unit 20 and charge and discharge protecting unit 10,
D.C. contactor unit 30 is connected.Wherein, charge and discharge protecting unit 10 carries out data sampling to Li-ion batteries piles 200 and sentences
Break relatively and exports control signal；MOS switch unit 20 is disconnected or is led according to control signal control D.C. contactor unit 30
The charging and discharging circuit of logical Li-ion batteries piles 200.
More specifically, D.C. contactor K1 and D.C. contactor K2 series winding be connected to input/output 300 negative pole end P- and
Between the negative pole end B- of Li-ion batteries piles 200；The anode of diode D1 is connected with the negative pole end P- of input/output 300, two poles
The anode of pipe D2 is connected with the negative pole end B- of Li-ion batteries piles 200；The negative pole end P- phase of triggering end VM and input/output 300
Even；Driving coil L1 and MOS switch M1 series winding is connected between the positive terminal P+ and negative pole end P- of the input/output 300；Driving
Coil L2, MOS switch M2 and electric discharge start switch S1 series winding be connected to Li-ion batteries piles 200 positive terminal B+ and negative pole end B- it
Between.
One end of driving coil L1 is connected with the positive terminal P+ of input/output 300, and the driving coil L1 other end is opened with MOS
The source electrode for closing M1 is connected；One end of driving coil L2 is connected with the positive terminal B+ of Li-ion batteries piles 200, and driving coil L2 is another
End is connected with the drain electrode of MOS switch M2；The grid of MOS switch M1 is connected with charge control end CO, the drain electrode of MOS switch M1 with it is defeated
Enter/export 300 negative pole end P- be connected, the source electrode of MOS switch M1 is connected with the driving coil L1 other end；The grid of MOS switch M2
Pole is connected with discharge control terminal DO, and the source electrode of MOS switch M2 starts switch the one end S1 with electric discharge and is connected, and it is another that electric discharge starts switch S1
One end is connected with the negative pole end B- of Li-ion batteries piles 200.
The present embodiment lithium ion battery charge-discharge protection circuit is specifically divided into charge protection process and discharge prevention process.
During charge protection: input/output 300 at this time is charging unit, when Li-ion batteries piles 200 are in just
When normal charged state, the charge control end CO of charge and discharge protecting unit 10 exports high level signal, MOS in MOS switch unit 20
Switch M1 is in an off state, and does not have electric current to flow through in driving coil L1, and D.C. contactor K1 is in normally off, charging unit
It is charged by D.C. contactor K1 and diode D2 to Li-ion batteries piles 200；When some single battery in charging process
Or the voltage of all single batteries is more than when presetting to overcharge protection voltage, the charge control end CO of charge and discharge protecting unit can be exported
Low level signal, at this point, the low level control signal can control MOS switch M1 conducting, a smaller current flows through driving line
It encloses L1 to disconnect the normally closed type contact D.C. contactor K1, cuts off the charging current to Li-ion batteries piles 200 at once.It drives at this time
The electric current flowed through in coil L1 is derived from charging unit (external charging power supply), will not consume the electric energy of Li-ion batteries piles 200, real
Now to the additives for overcharge protection of Li-ion batteries piles 200.
During discharge prevention: input/output 300 at this time is electrical equipment (such as electric car), when starting should
When electrical equipment, i.e., S1 star t-up discharge circuit is started switch by electric discharge, which, which starts switch S1, can be one by user
The electric discharge of manual control starts switch (electric discharge of such as automobile starting power supply starts switch) and is also possible to provide letter by electrical equipment
Number (such as automatic MOS switch) is started switch the electric discharge that controls.When Li-ion batteries piles 200 do not need electric discharge, electric discharge starting
Switch S1 is to disconnect, and no electric current flows through driving coil L2, and D.C. contactor K2 is normally opened, thus discharge loop is off shape
State；When needing to discharge, electric discharge starts switch S1 closure, when Li-ion batteries piles 200 are in normal condition, charge and discharge protecting
The discharge control terminal DO of unit 10 will export high level signal, and MOS switch M2 is in the conductive state, have electric current in driving coil L2
It flows through, the normally opened contact of D.C. contactor K2 closure, Li-ion batteries piles 200 are straight by D.C. contactor K2 and normally off
Stream contactor K1 discharges to electrical equipment；When charge and discharge protecting unit 20 detect in discharge process some single battery or
When saying that all monomer battery voltages are lower than default over voltage, low level signal will be exported in discharge control terminal DO, it should
Low level control signal control MOS switch M2 is disconnected, and the electric current for flowing through driving coil L2 is cut off, and D.C. contactor K2 restores
Normally open is cut off the discharge current of electrical equipment, and then Li-ion batteries piles 200 is protected not damage because of overdischarge
It is bad.The electric current for flowing through driving coil L2 in the on-state will be derived from Li-ion batteries piles 200, the electric current and discharge process it is big
Energy loss caused by electric current is compared can be ignored, and realize the over to Li-ion batteries piles 200.
The working principle of the present embodiment is identical as embodiment one and two, and details are not described herein for other same part, interior in detail
Appearance refers to embodiment one and two.
Example IV:
The present invention also provides a kind of lithium-ion battery systems embodiments, specifically include Li-ion batteries piles 200, Yi Jishang
State the lithium ion battery charge-discharge protection circuit 100 in embodiment, the lithium ion battery charge-discharge protection circuit 100 and lithium from
Sub- battery pack 200 is set together to form lithium-ion battery systems, passes through the realization pair of lithium ion battery charge-discharge protection circuit 100
The charge and discharge protecting of Li-ion batteries piles 200.
The specific charge and discharge process and working principle of the present embodiment lithium-ion battery systems are identical as embodiment one to three,
Details are not described herein for his same section, and detailed content refers to embodiment one to three.
The foregoing is merely illustrative of the preferred embodiments of the present invention, and those skilled in the art know, is not departing from the present invention
Spirit and scope in the case where, various changes or equivalent replacement can be carried out to these features and embodiment.In addition, in this hair
Under bright introduction, it can modify to these features and embodiment to adapt to particular situation and material without departing from this hair
Bright spirit and scope.Therefore, the present invention is not limited to the particular embodiment disclosed, the power of fallen with the application
Embodiment in sharp claimed range belongs to protection scope of the present invention.
Claims (7)
1. a kind of lithium ion battery charge-discharge protection circuit, which is characterized in that including being filled with what Li-ion batteries piles (200) were connected
Discharge prevention unit (10) is connected to the straight of the charging and discharging circuit of input/output (300) and the Li-ion batteries piles (200)
It flows contact unit (30), and is connected with the charge and discharge protecting unit (10), the D.C. contactor unit (30)
MOS switch unit (20)；
The charge and discharge protecting unit (10) carries out real time data acquisition to the Li-ion batteries piles (200) and judgement is compared simultaneously
Output control signal；The MOS switch unit (20) according to the control signal control the D.C. contactor unit (30) come
Disconnect or be connected the charging and discharging circuit；
The MOS switch unit (20) include MOS switch M1 and MOS switch M2 and one end be connected with the MOS switch M2 and
The electric discharge that the other end is connected with a polar end of the Li-ion batteries piles (200) starts switch S1；The electric discharge starts switch
S1 is the electronic switch that electric signal control is provided by electrical equipment；
The D.C. contactor unit (30) includes that series winding is connected to the input/output (300) and the Li-ion batteries piles
(200) the D.C. contactor K1 comprising driving coil L1 between a polar end and the D.C. contactor comprising driving coil L2
K2, and the diode D2 in parallel with the D.C. contactor K2；The driving coil L1 and MOS switch M1 series winding is connected to
Between the positive terminal P+ and negative pole end P- of the input/output (300)；The driving coil L2, the MOS switch M2 and described
Electric discharge starts switch S1 series winding and is connected between the positive terminal B+ and negative pole end B- of the Li-ion batteries piles (200)；The direct current
Contactor K1 is normally closed type D.C. contactor, and the D.C. contactor K2 is D.C. contactor open in usual.
2. lithium ion battery charge-discharge protection circuit according to claim 1, which is characterized in that the charge and discharge protecting list
First (10) include the Li-ion Battery Protective Chip and resistance capacitance element being connected with the Li-ion batteries piles (200), described
Li-ion Battery Protective Chip includes the voltage input end for the Li-ion batteries piles (200) to be carried out with real time data acquisition
(11), the charge control end CO for exporting the control signal of control charging, the control for exporting control electric discharge
The discharge control terminal DO of the signal and triggering end VM for being used to carry out the input/output (300) real time signal aquisition.
3. lithium ion battery charge-discharge protection circuit according to claim 2, which is characterized in that the charge and discharge protecting list
The Li-ion Battery Protective Chip of first (10) is the Li-ion Battery Protective Chip of negative pole structure altogether, the D.C. contactor unit
It (30) further include the diode D1 in parallel with the D.C. contactor K1；
The D.C. contactor K1 and D.C. contactor K2 series winding is connected to the positive terminal P+ of the input/output (300) and described
Between the positive terminal B+ of Li-ion batteries piles (200)；The cathode of the diode D1 and the anode of the input/output (300)
P+ is held to be connected, the cathode of the diode D2 is connected with the positive terminal B+ of the Li-ion batteries piles (200)；The triggering end VM
It is connected with the positive terminal P+ of the input/output (300).
4. lithium ion battery charge-discharge protection circuit according to claim 3, which is characterized in that the MOS switch M1 is
NMOS tube, the MOS switch M2 are PMOS tube；
The grid of the MOS switch M1 is connected with the charge control end CO, the drain electrode of the MOS switch M1 and the driving line
It encloses L1 to be connected, the source electrode of the MOS switch M1 is connected with the negative pole end P- of the input/output (300)；The MOS switch M2
Grid be connected with the discharge control terminal DO, the source electrode of the MOS switch M2 is connected with the driving coil L2, the MOS
The drain electrode of switch M2 starts switch the one end S1 with the electric discharge and is connected, and the electric discharge starts switch the S1 other end and the lithium ion
The negative pole end B- of battery pack (200) is connected.
5. lithium ion battery charge-discharge protection circuit according to claim 2, which is characterized in that the charge and discharge protecting list
The Li-ion Battery Protective Chip of first (10) is the Li-ion Battery Protective Chip of anode structure altogether, the D.C. contactor unit
It (30) further include the diode D1 in parallel with the D.C. contactor K1；
The D.C. contactor K1 and D.C. contactor K2 series winding is connected to the negative pole end P- of the input/output (300) and described
Between the negative pole end B- of Li-ion batteries piles (200)；The anode and the cathode of the input/output (300) of the diode D1
P- is held to be connected, the anode of the diode D2 is connected with the negative pole end B- of the Li-ion batteries piles (200)；The triggering end VM
The other end is connected with the negative pole end P- of the input/output (300).
6. lithium ion battery charge-discharge protection circuit according to claim 5, which is characterized in that the MOS switch M1 is
PMOS tube, the MOS switch M2 are NMOS tube；
The grid of the MOS switch M1 is connected with the charge control end CO other end, the drain electrode of the MOS switch M1 with it is described
The negative pole end P- of input/output (300) is connected, and the source electrode of the MOS switch M1 is connected with the driving coil L1；The MOS
The grid of switch M2 is connected with the discharge control terminal DO other end, and the source electrode of the MOS switch M2 is opened with electric discharge starting
It closes the one end S1 to be connected, the drain electrode of the MOS switch M2 is connected with the driving coil L2；The electric discharge starts switch the S1 other end
It is connected with the negative pole end B- of the Li-ion batteries piles (200).
7. a kind of lithium-ion battery systems, including Li-ion batteries piles (200), which is characterized in that further include claim 1 to 6
Described in any item lithium ion battery charge-discharge protection circuits (100), the lithium ion battery charge-discharge protection circuit (100) with
The Li-ion batteries piles (200) are set together.
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| CN201610409354.0A CN106026244B (en) | 2016-06-12 | 2016-06-12 | Lithium ion battery charge-discharge protection circuit and lithium-ion battery systems |
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| CN201610409354.0A CN106026244B (en) | 2016-06-12 | 2016-06-12 | Lithium ion battery charge-discharge protection circuit and lithium-ion battery systems |
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| CN106026244B true CN106026244B (en) | 2019-03-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106533373B (en) * | 2016-11-22 | 2019-04-09 | 中国电子科技集团公司第五十四研究所 | A kind of circuit preventing Full differential operational amplifier common mode latch |
| CN108282015A (en) * | 2018-03-30 | 2018-07-13 | 北京国能电池科技股份有限公司 | Battery monitoring device and control system |
| CN112769185B (en) * | 2020-12-31 | 2023-02-03 | 李砚泉 | Battery pack charging and discharging control device, control method and battery device |
| CN114336841A (en) * | 2021-12-28 | 2022-04-12 | 上海电气国轩新能源科技有限公司 | Battery inter-cluster current sharing control circuit, system and method |
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| CN106026244A (en) | 2016-10-12 |
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