CN208862590U - A kind of li-ion cell protection system - Google Patents
A kind of li-ion cell protection system Download PDFInfo
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- CN208862590U CN208862590U CN201821321867.7U CN201821321867U CN208862590U CN 208862590 U CN208862590 U CN 208862590U CN 201821321867 U CN201821321867 U CN 201821321867U CN 208862590 U CN208862590 U CN 208862590U
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Abstract
A kind of li-ion cell protection system, li-ion cell protection system includes lithium battery group, sampling module, sampling resistor, protect chip module, level-one charge control module, second level charge control module, level-one control of discharge module, two-stage discharge control module, temperature protection module, electric quantity balancing module, electric quantity balancing display module, fuse module and output bus, li-ion cell protection system can play level-one and overcharge, level-one over-discharge, charge and discharge overcurrent, load short circuits and temperature protection function, and the second level to work when level-one overcharges shielding failure crosses the second level Cross prevention function of working when charging protection function and the failure of level-one Cross prevention, and charge and discharge overcurrent, the overcurrent protection function that load short circuit protection function plays when failing.The utility model is consistent each lithium battery end voltage substantially after charge and discharge by electric quantity balancing module, reduces the difference of each lithium battery end voltage, can preferably extend the service life of lithium battery.
Description
Technical field
The utility model belongs to battery technology field, is related to lithium battery, is a kind of li-ion cell protection system.
Background technique
Lithium battery is because the remarkable advantages such as its operating voltage high, energy density is big, self-discharge rate is low, memory-less effect are just
It takes formula electric appliance such as laptop computer, video camera, be widely used in mobile communication.The high capacity lithium ion battery developed at present is
Start to try out in electric car, it is contemplated that one of the major impetus power supply of 21 century electric car will be become, and will defended artificial
It is applied in terms of star, aerospace and energy storage.With the pressure of the in short supply and world environmental protection aspect of the energy.Lithium battery quilt now
Be widely used in electric vehicle industry, the especially appearance of LiFePO 4 material battery, more pushed lithium battery industry development and
Using.
But when lithium battery voltage is excessively high, generation side effect can be started and result even in battery explosion, and work as voltage
When too low, some materials can start to be destroyed.In addition, when current is excessive, lithium ion has little time to enter memory location, can be gathered in
Material surface.These lithium ions obtain electronics after, can on the surface of the material generate lithium atom crystallization, this with overcharge, will cause
Risk.Just in case battery case ruptures, will explode.Therefore, to the protection of lithium ion battery, at least to include: charging voltage
The upper limit, discharge voltage lower limit and upper current limit three.In addition, causing each monomer electricity in lithium battery because of the reasons such as manufacturing process
Having differences property is pressed, lasting charge and discharge process can aggravate the difference, this shortens the service life of lithium battery.
Summary of the invention
The purpose of this utility model is to provide a kind of li-ion cell protection system and methods, to realize the mistake to lithium battery
It fills, over-discharge, the protection of overcurrent, load short circuits and excess temperature, extends the service life of lithium battery.
The technical solution of the utility model are as follows: a kind of li-ion cell protection system, lithium battery group are being connected to output bus just
Between cathode, the protection system includes sampling module, protection chip module, electric quantity balancing module, protection chip module, temperature
Protective module, electric quantity balancing module, charge and discharge control module and fuse module, sampling module are used to acquire the electricity of lithium battery group
Current voltage, and protection chip module is inputted, it protects in chip module and is preset with li-ion cell protection threshold value, for according to sampled voltage
The comparison result of current data and protection threshold value exports control signal to electric quantity balancing module and charge and discharge control module, and electricity is equal
The module that weighs is used for the circuit conditioning of lithium battery group, and charge and discharge control module is serially connected between lithium battery group and output bus cathode,
For controlling the on-off of lithium battery group circuit；Temperature protection module is connected electrically between output bus anode and lithium battery group, and
The temperature detection part of temperature protection module is tightly attached to lithium battery group battery core surface, and temperature protection module is according to temperature detection result
The on-off of lithium battery group circuit is controlled, fuse module is arranged between charge and discharge control module and the cathode for exporting bus.
Further, the sampling module includes voltage sample module and current sampling module, the acquisition of voltage sample module
The terminal voltage signal of each lithium battery in the lithium battery group, and the protection chip dies are transmitted signals to by being electrically connected
Block；It is serially connected with sampling resistor between lithium battery group and charge and discharge control module, is flowed in current sampling module acquisition sampling resistor
The charging and discharging currents signal of warp, and the protection chip module is transmitted signals to by being electrically connected.
Further, the protection chip module includes charge balancing detection module, equalization discharge detection module, level-one mistake
It fills protective module, level-one Cross prevention module, second level and overcharges protective module, second level Cross prevention module, charging over-current detection mould
Block and electric discharge over-current detection module, charge and discharge control module is corresponding include level-one charge control module, second level charge control module,
Level-one control of discharge module and two-stage discharge control module, the charge balancing detection module, equalization discharge detection module, level-one
Overcharge protective module, level-one Cross prevention module, second level overcharge protective module, second level Cross prevention module receive sampling module it is defeated
Voltage sampling signal out, the charging over-current detection module, electric discharge over-current detection module receive the electric current of sampling module output
Sampled signal；The output end of the charge balancing detection module and equalization discharge detection module is connected to electric quantity balancing module
Control terminal, the level-one overcharges protective module, the output end for the over-current detection module that charges is connected to level-one charge control module
Control terminal, the level-one Cross prevention module, discharge over-current detection module output end be connected to level-one control of discharge module
Control terminal, the output end that the second level overcharges protective module is connected to the control terminal of the second level charge control module, described
The output end of second level Cross prevention module is connected to the control terminal of the two-stage discharge control module.
The level-one charge control module, second level charge control module, level-one control of discharge module and two-stage discharge control
The control end signal of module controls the unlatching and disconnection of respective input terminal and output end.
It is preferred that level-one, which overcharges protective module, level-one Cross prevention module, second level, overcharges protective module, second level
Cross prevention module is equipped with protection threshold value, and the second level overcharges protection threshold value and overcharges protection threshold value 0.1V to 0.3V higher than level-one,
The second level Cross prevention threshold value is lower than level-one Cross prevention threshold value 0.2V to 0.5V.
It is preferred that charging over-current detection module and electric discharge over-current detection module are equipped with charging overcurrent threshold value and electric discharge
Overcurrent threshold value, the charging overcurrent threshold value, electric discharge overcurrent threshold value are taken as 2 times of li-ion cell protection system nominal current value.
Further, the electric quantity balancing module includes equalization control module and equalizing resistance, corresponding electric quantity balancing module
It is additionally provided with electric quantity balancing display module；The output of the input connection protection chip module of the equalization control module, Balance route
The output end connection of module equalizing resistance and electric quantity balancing display module in parallel, the electric quantity balancing wired in parallel is in lithium battery
The each lithium battery both ends of group.
It is preferred that the blow-out current value of fuse module is taken as 2 times of li-ion cell protection system nominal current value.
The utility model has the advantage that.The utility model considers lithium battery in use, overcharge, mistake
Electric discharge, overcurrent and excess temperature can all influence battery and performance, and serious person will lead to the feelings of lithium battery burning, explosion
Under condition, realize lithium battery level-one is overcharged, level-one over-discharge, charge and discharge overcurrent, load short circuits and on the basis of overheat protector,
Increase second level overcharge, second level Cross prevention and fuse, to prevent in first class of protection chip or level-one charge and discharge control module
Lithium battery is damaged when failure, so that more efficient protect lithium battery and external equipment, extends the use of lithium battery
Service life.
Detailed description of the invention
Fig. 1 is the utility model li-ion cell protection system composition and structural schematic diagram.
Specific embodiment
With reference to the accompanying drawings and examples, the specific embodiment of this method is described in further detail.This is practical new
The system the Nomenclature Composition and Structure of Complexes of type is as shown in Figure 1, include lithium battery group 1, sampling module 2, voltage sample module 3, current sample mould
Block 4, sampling resistor 5, protection chip module 6, charge balancing detection module 7, equalization discharge detection module 8, level-one overcharge protection
Module 9, level-one Cross prevention module 10, second level overcharge protective module 11, second level Cross prevention module 12, charging over-current detection
Module 13, electric discharge over-current detection module 14, level-one charge control module 15, second level charge control module 16, level-one control of discharge
Module 17, two-stage discharge control module 18, temperature protection module 19, electric quantity balancing module 20, equalization control module 21, balanced electricity
Resistance 22, fuse module 23, output bus B+24, electric quantity balancing display module 25, output bus B-26.
Voltage sample module 3 acquires the terminal voltage signal of each lithium battery in lithium battery group 1, and current sampling module 4 acquires
The charging and discharging currents signal flowed through in sampling resistor 5.Charge balancing detection module 7, equalization discharge detection module 8, level-one overcharge
Protective module 9, level-one Cross prevention module 10, second level overcharge protective module 11, the input terminal of second level Cross prevention module 12 connects
Be connected to the output end of voltage sample module 3, charging over-current detection module 13, over-current detection module 14 of discharging input terminal be connected to
The output end of current sampling module 4；It is equal that the output end that charge balancing detection module 7, equalization discharge detect mould 8 is connected to electricity
The control terminal for the module 20 that weighs, level-one overcharges protective module 9, the output end for the over-current detection module 13 that charges is connected to level-one charging
The control terminal of control module 15, level-one Cross prevention module 10, over-current detection module 14 of discharging output end be connected to level-one and put
The control terminal of electric control module 17, the output end that second level overcharges protective module 11 are connected to the control of second level charge control module 16
End, the output end of second level Cross prevention module 12 are connected to the control terminal of two-stage discharge control module 18.Equalization control module 21
Output end be connected to the input terminal of equalizing resistance 22 Yu electric quantity balancing display module 25；The output end and electricity of equalizing resistance 22
The output end for measuring balanced display module 25 is connected；Electric quantity balancing module 20 is parallel to each lithium battery both ends of lithium battery group 1.Temperature
The input terminal of degree protective module 19 is connected to output bus B+24, and the output end of temperature protection module 19 is connected to lithium battery group 1
Input terminal, the output end of lithium battery group 1 is connected to the input terminal of sampling resistor 5, and the output end of sampling resistor 5 is connected to level-one
The input terminal of charge control module 15, the output end of level-one charge control module 15 are connected to the defeated of second level charge control module 16
Enter end, the output end of second level charge control module 16 is connected to the input terminal of level-one control of discharge module 17, level-one control of discharge
The output end of module 17 is connected to the input terminal of two-stage discharge control module 18, the output end connection of two-stage discharge control module 18
To the input terminal of fuse module 23, fuse module 23 is connected to output bus B-26, the temperature inspection of temperature protection module 19
It surveys part and is tightly attached to 1 battery core surface of lithium battery group accurately to detect the battery core temperature of lithium battery group 1 in charge and discharge process.
The utility model using the collected voltage of sampling module 2, current signal exceptional value as protection chip module 6 into
The signal for entering guard mode, using temperature protection module 19 as the over-temperature protection device of lithium battery group 1.In charging process, work as electricity
When pressure sampling module 3 has collected in lithium battery group 1 part lithium battery terminal voltage signal and is higher than charge balancing and opens threshold value, charging
Balanced detection module 7 issues charge balancing open signal and opens equalization control module 21 and electric quantity balancing display module 25, at this time
In charge balancing state；And when lithium battery end voltage releases threshold value lower than charge balancing, charge balancing detection module 7 issues
Equalization control module 21 and electric quantity balancing display module 25 are closed in charge balancing ring off signal.Lithium battery group 1 continues to charge, at this time
When part lithium battery end voltage overcharges protection threshold value higher than level-one, level-one overcharges the sending of protective module 9 level-one and overcharges protection signal
It controls level-one charge control module 15 to close, cuts off charge circuit；And when the lithium battery end voltage overcharges protection solution lower than level-one
Except threshold value, level-one overcharges the sending of protective module 9 level-one and overcharges the protection ring off signal control unlatching of level-one charge control module 15, connects
Logical charge circuit.If in normal charging process, voltage sample module 3 has collected part lithium battery end electricity in lithium battery group 1
When pressure signal overcharges protection threshold value higher than level-one, the level-one that level-one overcharges the sending of protective module 9 overcharges protection signal and not can control
Level-one charge control module 15 is closed or level-one overcharges protective module 9 and do not issue level-one and overcharges protection signal, at this time lithium battery after
Charged state is held in continuation of insurance, and when the lithium battery end voltage, which is higher than second level, overcharges protection threshold value, second level overcharges the sending of protective module 11
Second level overcharges protection signal control second level charge control module 16 and closes, and cuts off charge circuit.And when the lithium battery end voltage is low
Protection is overcharged in second level and releases threshold value, and second level overcharges the sending of protective module 11 second level and overcharges protection ring off signal control second level charging
Control module 16 is opened, and charge circuit is connected.When charging current is more than charging overcurrent threshold value, the charging over-current detection module
13, which issue charging overcurrent protection signal control level-one charge control module 15, closes, and cuts off charge circuit, protects into charging overcurrent
Shield.When removing external connection, charging overcurrent protection is exited.
In discharge process, it is lower than when voltage sample module 3 has collected part lithium battery terminal voltage signal in lithium battery group 1
When level-one Cross prevention threshold value, level-one Cross prevention module 10 issues level-one Cross prevention signal and controls level-one control of discharge module
17 close, and cut off discharge loop, into level-one Cross prevention state, the equalization discharge detection module on remaining lithium battery at this time
8, which issue equalization discharge signals control equalization control modules 21, opens, and makes the lithium battery by being connected in parallel on the electric quantity balancing mould at both ends
Block 20 discharges, and is also turned on electric quantity balancing display module 25 and shows to be now in equalization discharge state；And when lithium battery end electricity
It forces down when level-one Cross prevention threshold value, equalization discharge detection module 8 issues equalization discharge ring off signal and closes Balance route mould
Block 21 and electric quantity balancing display module 25.After cutting off discharge loop, when the lithium battery end voltage is higher than level-one Cross prevention solution
When except threshold value, level-one Cross prevention module 10 issues level-one Cross prevention ring off signal control level-one control of discharge module 17 and opens
It opens, connects discharge loop.If in normal discharge, voltage sample module 3 has collected part lithium battery in lithium battery group 1
When terminal voltage signal is lower than level-one Cross prevention threshold value, the level-one Cross prevention signal that level-one Cross prevention module 10 issues fails
Control level-one control of discharge module 17 is closed or level-one Cross prevention module 10 does not issue level-one Cross prevention signal, at this time lithium electricity
Pond continues to keep discharge condition, when the lithium battery end voltage is lower than second level Cross prevention threshold value, second level Cross prevention module 12
It issues second level Cross prevention signal control two-stage discharge control module 18 to close, cuts off discharge loop.And when lithium battery end electricity
Pressure is higher than second level Cross prevention and releases threshold value, and second level Cross prevention module 12 issues the ring off signal of second level Cross prevention and controls second level
Control of discharge module 18 is opened, and discharge loop is connected.When discharge current is more than electric discharge overcurrent threshold value, the electric discharge over-current detection mould
Block 14 issues electric discharge overcurrent protection signal control level-one control of discharge module 17 and closes, and cuts off discharge loop, into electric discharge overcurrent
Protection；When removing external connection, electric discharge overcurrent protection is exited.When load short circuits occur, electric discharge over-current detection module 14 is sent out
Short-circuit protection signal control level-one control of discharge module 17 is closed out, cuts off discharge loop, is protected into load short circuits；When removing
When load, load short circuits protection is exited.
In charge and discharge process, when the battery core surface temperature of the lithium battery group 1 is higher than temperature protection threshold value, temperature protection mould
The movement cutting charging and discharging circuit of block 19.And when temperature releases threshold value lower than temperature protection, temperature protection module 19 is again switched on
Charging and discharging circuit.
In charging process, when charging current is more than charging overcurrent threshold value, what the charging over-current detection module 13 issued fills
Electric overcurrent protection signal fails to close level-one charge control module 15 or the over-current detection module 13 that charges does not issue charging overcurrent and protects
Protect signal；In discharge process, when discharge current is more than electric discharge overcurrent threshold value, the electric discharge of electric discharge over-current detection module 14 sending
Overcurrent protection signal fails to close level-one control of discharge module 17 or over-current detection module 14 of discharging does not issue electric discharge overcurrent protection
Signal；When load short circuits, the short-circuit protection signal that electric discharge over-current detection module 14 issues fails to close level-one control of discharge module
17 or electric discharge over-current detection module 14 do not issue short-circuit protection signal, fuse module 23 can fuse in the case of this 3 kinds, rise
To the function of protection lithium battery group 1.
Illustrate the realization of the utility model below by embodiment.
Embodiment one
Lithium battery group 1 is 3 string ferric phosphate batteries, load current value 10A.Charge balancing detection module 7 and electric discharge are equal
Weighing apparatus detection module 8, level-one overcharge protective module 9, level-one Cross prevention module 10 uses the S- 8209AAU- of Ai Puling section, Japan
I8T1U protect chip, level-one overcharge protection threshold value is 3.6V, level-one overcharge protection release threshold value be 3.5V, charge balancing is opened
Open threshold value be 3.55V, charge balancing release threshold value be 3.5V, level-one Cross prevention threshold value is 2.2V, level-one Cross prevention release
Threshold value is 2.5V.Second level overcharges protective module 11, second level Cross prevention module 12, charging over-current detection module 13, electric discharge overcurrent
Detection module 14 protects chip using the R5460N213AD of Japan Ricoh, and second level overcharges protection threshold value and overcharges for 3.9V, second level
Protection releasing threshold value is 3.45V, second level Cross prevention threshold value is 2V, level-one Cross prevention releasing threshold value is 2.5V, charge and discharge
Stream threshold value is 20A.Level-one charge control module 15, second level charge control module 16, level-one control of discharge module 17, two-stage discharge
Control module 18 is all made of the metal-oxide-semiconductor of model RU3070L.Temperature protection module is normal using 65 DEG C of model KSD9700
Close temperature switch.Fuse module uses fusing value for the fuse of 20A.Electric quantity balancing display module is green LED lamp.
Output bus B+24 connects charger anode, and output bus B-25 connects charger negative terminal, electric at this time into charge mode
Pressure sampling module 3 detects that the second section lithium battery end voltage is 3.56V, is higher than charge balancing and opens threshold value, LED light is always on.After
Continuous charging, lithium battery end voltage continue to increase, and the second section lithium battery end voltage is 3.62V at this time, overcharge protection threshold higher than level-one
Value, level-one overcharge the sending of protective module 9 level-one and overcharge protection signal-off level-one charge control metal-oxide-semiconductor 15, cut off charge circuit
Lithium battery end voltage falls to 3.4V afterwards, overcharges protection lower than level-one and releases threshold value and charge balancing releasing threshold value, and LED light is gone out,
And level-one charge control metal-oxide-semiconductor 15 is open-minded, connects charge circuit and enters charge mode.At this point, current sampling module 4 detects
Current value be 6A, lower than charging overcurrent protection threshold value, be in normal charging condition.Charging a period of time, the temperature on battery core surface
Degree rises to 68 DEG C, is higher than temperature protection threshold value, and temperature protection module 19 becomes opening state from normally off, cuts off charge circuit
To prevent the excessively high damage battery core of battery core temperature.
When output bus B+24 connects load anode, output bus B-25 connects load negative terminal, into discharge mode, loads at this time
Both ends contact, and electric discharge over-current detection module 14 detects that load short circuits signal control level-one electric discharge MOS is closed, into negative
Short-circuit protection is carried, load is connected again after removing load, is again introduced into discharge mode, voltage sample module 3 detects third section
Lithium battery end voltage is 2.18V, is lower than level-one Cross prevention threshold value, and level-one discharge prevention metal-oxide-semiconductor 17 is closed, and cutting is discharged back
Road, first segment, the second section lithium battery end voltage are respectively 2.38V, 2.29V, meet equalization discharge unlocking condition, and LED light is bright, the
One, the lithium battery of two sections enters equalization discharge mode, and after a period of time, first segment, the second section lithium battery end voltage are respectively
2.15V, 2.14V, LED light are gone out, and equalization discharge mode is exited.
Embodiment two
Lithium battery group 1 is 4 string ternary lithium batteries, load current value 15A.Charge balancing detection module 7 and equalization discharge
Detection module 8, level-one overcharge protective module 9, level-one Cross prevention module 10 uses the S- 8209AAI- of Ai Puling section, Japan
T8T1U protect chip, level-one overcharge protection threshold value is 4.15V, level-one overcharge protection release threshold value be 4.05V, charge balancing
Unlatching threshold value is 3.9V, charge balancing releasing threshold value is 3.9V, level-one Cross prevention threshold value is 3V, level-one Cross prevention releases threshold
Value is 3.3V.Second level overcharges protective module 11, second level Cross prevention module 12, charging over-current detection module 13, electric discharge overcurrent inspection
It surveys module 14 and chip is protected using the R5432V404BA of Japan Ricoh, second level overcharges protection threshold value and overcharges for 4.25V, second level
Protection releasing threshold value is 4.1V, second level Cross prevention threshold value is 2.5V, level-one Cross prevention releasing threshold value is 3V, charge and discharge overcurrent
Threshold value is 20A.Level-one charge control module 15, second level charge control module 16, level-one control of discharge module 17, two-stage discharge control
Molding block 18 is all made of the metal-oxide-semiconductor of model AOD508.Temperature protection module uses 60 DEG C of model KSD9700 of normally closed temperature
Degree switch.Fuse module uses fusing value for the fuse of 30A.Electric quantity balancing display module is green LED lamp.
Output bus B+24 connects charger anode, and output bus B-25 connects charger negative terminal, electric at this time into charge mode
Pressure sampling module 3 detects that first segment lithium battery end voltage is 3.92V, is higher than charge balancing and opens threshold value, LED light is always on.After
Continuous charging, lithium battery end voltage continue to increase, and first segment lithium battery end voltage is 4.18V at this time, overcharge protection threshold higher than level-one
Value, level-one overcharge protective module 9 do not issue level-one overcharge protection signal or level-one overcharge protection signal have not been able to close level-one fill
Electric control metal-oxide-semiconductor 15, lithium battery end voltage are increased to 4.30V, overcharge protection threshold value higher than second level, second level overcharges protection mould at this time
Block 11 issues second level and overcharges protection signal-off second level charge control metal-oxide-semiconductor 17, and charge closing circuit is avoided because of first class of protection
The danger that IC and corresponding protection control module failure cause lithium battery to overcharge.
When output bus B+24 connects load anode, output bus B-25 connects load negative terminal, into discharge mode, loads both ends
It contacts, electric discharge over-current detection module 14 is not detected load short circuits signal or not can control level-one electric discharge MOS pipe 17 and closes
It closes, fuse module 23 fuses at this time, cuts off discharge loop, avoids because of electric discharge over-current detection module 14 and corresponding protection
The danger that control module failure causes lithium battery to damage or even explode.After removing load short circuits exception, certainly to fuse module 23
After recovery, discharge loop is connected.After a period of time, voltage sample module 3 detects that the second section lithium battery end voltage is 2.95V,
Lower than level-one Cross prevention threshold value, level-one discharge prevention metal-oxide-semiconductor 17 is closed, and cuts off discharge loop, first segment, third section lithium battery
Holding voltage is respectively 3.14V, 3.09V, meets equalization discharge unlocking condition, and LED light is bright, and the lithium battery of the first and second section, which enters, to be put
Electrical equalization mode, after a period of time, first segment, the second section lithium battery end voltage are respectively 2.98V, 2.92V, and LED light is gone out, and is exited
Equalization discharge mode.
Embodiment three
Lithium battery group 1 is 8 string ternary lithium batteries, load current value 20A.Charge balancing detection module 7 and equalization discharge
Detection module 8, level-one overcharge protective module 9, level-one Cross prevention module 10 uses the S- 8209AAF- of Ai Puling section, Japan
T8T1U protect chip, level-one overcharge protection threshold value is 4.25V, level-one overcharge protection release threshold value be 4.1V, charge balancing
Unlatching threshold value is 4.1V, charge balancing releasing threshold value is 4V, level-one Cross prevention threshold value is 2.75V, level-one Cross prevention releases
Threshold value is 3.05V.Second level overcharges protective module 11, second level Cross prevention module 12, charging over-current detection module 13, electric discharge overcurrent
Detection module 14 protects chip using the R5460N230AA of Japan Ricoh, and it is 4.375V, second level mistake that second level, which overcharges protection threshold value,
Fill protection release threshold value be 4.175V, second level Cross prevention threshold value is 2.5V, level-one Cross prevention release threshold value be 2.7V, charge and discharge
Electric overcurrent threshold value is 20A.Level-one charge control module 15, second level charge control module 16, level-one control of discharge module 17, second level
Control of discharge module 18 is all made of the metal-oxide-semiconductor of two in parallel AOD508 two-by-two.Temperature protection module uses model
70 DEG C of KSD9700 of normally closed temperature switch.Fuse module uses fusing value for the fuse of 40A.Electric quantity balancing display module
For green LED lamp.
Output bus B+24 connects charger anode, and output bus B-25 connects charger negative terminal, into charge mode, charging one
After the section time, voltage sample module 3 detects that first segment lithium battery end voltage is 4.12V, is higher than charge balancing and opens threshold value,
LED light is always on.Continue to charge, lithium battery end voltage continues to increase, and first segment lithium battery end voltage is 4.26V at this time, is higher than one
Grade overcharges protection threshold value, and level-one overcharges the sending of protective module 9 level-one and overcharges protection signal-off level-one charge control metal-oxide-semiconductor 15,
Cut off charge circuit.
When output bus B+24 connects load anode, output bus B-25 connects load negative terminal, into discharge mode, discharge process
In, temperature protection module 19 detects that battery core surface temperature reaches 72 DEG C, is higher than temperature protection threshold value, disconnects discharge loop.One
After the section time, temperature protection module 19 detects that battery core surface temperature drops to 50 DEG C, releases threshold value lower than temperature protection, connects again
Logical discharge loop.Voltage sample module 3 detects that the second section lithium battery end voltage is 2.72V at this time, is lower than level-one Cross prevention
Threshold value, level-one Cross prevention module 10 does not issue level-one Cross prevention signal or the signal of sending not can control level-one discharge prevention
Metal-oxide-semiconductor 17 is closed, and lithium battery end voltage continues to drop to 2.45 at this time, is lower than second level Cross prevention threshold value, second level Cross prevention
Module 12 controls two-stage discharge control metal-oxide-semiconductor and closes, and cuts off discharge loop.
Embodiment of above is merely to illustrate the utility model, and is not limitation of the utility model, related technology neck
The those of ordinary skill in domain, in the case where not departing from the spirit and scope of the utility model, can also make a variety of changes and
Modification, therefore all equivalent technical solutions also belong to the scope of this method, the scope of patent protection Ying Youquan of the utility model
Benefit requires to limit.
Claims (8)
1. a kind of li-ion cell protection system, lithium battery group (1) is connected between the positive and negative anodes of output bus, it is characterized in that the guarantor
Protecting system includes sampling module (2), protection chip module (6), electric quantity balancing module (20), protection chip module (6), temperature guarantor
Module (19), electric quantity balancing module (20), charge and discharge control module and fuse module (23) are protected, sampling module (2) is for adopting
Collect the voltage and current of lithium battery group (1), and input protection chip module (6), lithium battery guarantor is preset in protection chip module (6)
Threshold value is protected, gives electric quantity balancing module for exporting control signal according to the comparison result of sampled voltage current data and protection threshold value
(20) and charge and discharge control module, electric quantity balancing module (20) are used for the circuit conditioning of lithium battery group, charge and discharge control module string
It connects between lithium battery group (1) and output bus cathode, for controlling the on-off of lithium battery group circuit；Temperature protection module (19)
It is connected electrically between output bus anode and lithium battery group, and the temperature detection part of temperature protection module (19) is tightly attached to lithium electricity
Pond group (1) battery core surface, temperature protection module (19) control the on-off of lithium battery group circuit, fuse according to temperature detection result
Module (23) is arranged between charge and discharge control module and the cathode for exporting bus.
2. a kind of li-ion cell protection system according to claim 1, it is characterized in that the sampling module (2) includes that voltage is adopted
Egf block (3) and current sampling module (4), voltage sample module (3) acquire the end of each lithium battery in the lithium battery group (1)
Voltage signal, and the protection chip module (6) is transmitted signals to by being electrically connected；In lithium battery group (1) and charge and discharge
It is serially connected between control module sampling resistor (5), the charge and discharge electricity flowed through in current sampling module (4) acquisition sampling resistor (5)
Signal is flowed, and transmits signals to the protection chip module (6) by being electrically connected.
3. a kind of li-ion cell protection system according to claim 1, it is characterized in that the protection chip module (6) includes filling
Electrical equalization detection module (7), equalization discharge detection module (8), level-one overcharge protective module (9), level-one Cross prevention module
(10), second level overcharges protective module (11), second level Cross prevention module (12), charging over-current detection module (13) and electric discharge overcurrent
Detection module (14), charge and discharge control module is corresponding include level-one charge control module (15), second level charge control module (16),
Level-one control of discharge module (17) and two-stage discharge control module (18), the charge balancing detection module (7), equalization discharge inspection
Survey module (8), level-one overcharges protective module (9), level-one Cross prevention module (10), second level and overcharges protective module (11), second level
Cross prevention module (12) receives the voltage sampling signal of sampling module (2) output, and the charging over-current detection module (13) is put
Electric over-current detection module (14) receives the current sampling signal of sampling module (2) output；The charge balancing detection module (7) and
The output end of equalization discharge detection module (8) is connected to the control terminal of electric quantity balancing module (20), and the level-one overcharges protection
Module (9), the output end of over-current detection module (13) of charging are connected to the control terminals of level-one charge control module (15), described
Level-one Cross prevention module (10), discharge over-current detection module (14) output end be connected to level-one control of discharge module (17)
Control terminal, the output end that the second level overcharges protective module (11) are connected to the control of the second level charge control module (16)
End, the output end of the second level Cross prevention module (12) are connected to the control terminal of the two-stage discharge control module (18).
4. a kind of li-ion cell protection system according to claim 3, it is characterized in that the level-one charge control module (15),
The control end signal control of second level charge control module (16), level-one control of discharge module (17) and two-stage discharge control module (18)
Make the unlatching and disconnection of respective input terminal and output end.
5. a kind of li-ion cell protection system according to claim 3, it is characterized in that level-one overcharges protective module (9), level-one
Cross prevention module (10), second level overcharge protective module (11), second level Cross prevention module (12) is equipped with protection threshold value, and described two
Grade overcharges protection threshold value and overcharges protection threshold value 0.1V to 0.3V higher than level-one, and the second level Cross prevention threshold value is lower than level-one over-discharge
Protect threshold value 0.2V to 0.5V.
6. a kind of li-ion cell protection system according to claim 3, it is characterized in that charging over-current detection module (13) and putting
Electric over-current detection module (14) is equipped with charging overcurrent threshold value and electric discharge overcurrent threshold value, the charging overcurrent threshold value, electric discharge overcurrent threshold
Value is taken as 2 times of li-ion cell protection system nominal current value.
7. a kind of li-ion cell protection system according to claim 1, it is characterized in that the electric quantity balancing module (20) includes
Equalization control module (21) and equalizing resistance (22), corresponding electric quantity balancing module (20) are additionally provided with electric quantity balancing display module
(25)；The equalization control module (21) input connection protection chip module (6) output, equalization control module (21) it is defeated
Outlet connection equalizing resistance (22) and electric quantity balancing display module (25) in parallel, the electric quantity balancing module (20) are parallel to lithium
The each lithium battery both ends of battery pack (1).
8. a kind of li-ion cell protection system according to claim 1, it is characterized in that the blowout current of fuse module (23)
Value is taken as 2 times of li-ion cell protection system nominal current value.
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| CN201821321867.7U CN208862590U (en) | 2018-08-15 | 2018-08-15 | A kind of li-ion cell protection system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112003340A (en) * | 2020-08-01 | 2020-11-27 | 海志电源技术（赣州）有限公司 | High-capacity energy storage battery management system and method |
| CN112910034A (en) * | 2021-01-20 | 2021-06-04 | 广东博力威科技股份有限公司 | Dust collector battery management method and device, electronic equipment and storage medium |
-
2018
- 2018-08-15 CN CN201821321867.7U patent/CN208862590U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112003340A (en) * | 2020-08-01 | 2020-11-27 | 海志电源技术（赣州）有限公司 | High-capacity energy storage battery management system and method |
| CN112910034A (en) * | 2021-01-20 | 2021-06-04 | 广东博力威科技股份有限公司 | Dust collector battery management method and device, electronic equipment and storage medium |
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