CN105680520B - A kind of discharge current hardware protection circuit of electric-vehicle-mounted lithium battery group - Google Patents
A kind of discharge current hardware protection circuit of electric-vehicle-mounted lithium battery group Download PDFInfo
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- CN105680520B CN105680520B CN201610165160.0A CN201610165160A CN105680520B CN 105680520 B CN105680520 B CN 105680520B CN 201610165160 A CN201610165160 A CN 201610165160A CN 105680520 B CN105680520 B CN 105680520B
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
-
- 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)
- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
- Secondary Cells (AREA)
Abstract
The present invention is applied to battery protection, there is provided a kind of discharge current hardware protection circuit of electric-vehicle-mounted lithium battery group, including：Signal sampling unit, for being sampled to the load current of electric car, and exported after the sample rate current is converted into sampled voltage；Detection unit, for when detecting that sampled voltage reaches default threshold value, exporting high level signal；Hardware protection unit, after detecting high level signal, cut off the connection of lithium battery group and vehicle load.The present invention can ensure when the situation such as short circuit or excessively stream occurs in the lithium battery group of vehicle; hardware protection unit can timely respond to; automatically cut off the connection of lithium battery group and vehicle load; further, in detection unit positive feedback introducing so that output signal is relatively stable; once there is abnormal i.e. output high level in detection unit locking lithium battery group; even if current fluctuation there will not be influence, the signal of output is still constant, unless can change output signal using software unblock.
Description
Technical field
The invention belongs to battery of electric vehicle technical field, more particularly to a kind of discharge current of electric-vehicle-mounted lithium battery group
Hardware protection circuit.
Background technology
In recent years, the environmental problem caused by traditional combustion engine automobile and petroleum resources are in short supply makes people invest the visual field
New-energy automobile.Pure electric automobile with it can really realize " zero-emission " and as the important development direction of electric automobile.Lithium from
Sub- battery relies on its excellent performance, becomes the ideal power source of New Generation of Electric Vehicle.But lithium battery motor-car is wide
General application can all cause battery life to greatly shorten there is also some problems, such as battery discharge excessively stream, short circuit etc.；Therefore
Lithium battery is in use, it is necessary to monitoring in real time, when running into abnormal conditions, timely processing, battery injury is preferably minimized.Pass
In the scheme of system, CPU monitors battery discharge current in real time, if reaching to a certain degree, then it is assumed that is excessively stream or short circuit, now
CPU disconnects discharge switch, to play a part of protecting battery；But there are two defects using such a scheme：
One：Response speed is slow, if CPU is now handling other things, can not timely respond to, cause battery by
Injury；
Two：Reliability is low, if software anomaly, can not play a protective role.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of discharge current hardware of electric-vehicle-mounted lithium battery group
Protection circuit, it is intended to the problem of prior art is slow using response speed during CPU progress battery discharge monitoring, and reliability is low.
The present invention is achieved in that a kind of discharge current hardware protection circuit of electric-vehicle-mounted lithium battery group, including：
Signal sampling unit, for being sampled to the load current of electric car, and the sample rate current is converted into and adopted
Exported after sample voltage；
Detection unit, it is connected with the signal sampling unit, for detecting that the sampled voltage reaches default
During threshold value, high level signal is exported；
Hardware protection unit, after detecting the high level signal, cut off the connection of lithium battery group and vehicle load.
Further, the signal sampling unit includes the sampling resistor being connected in vehicle load；
The load current is represented with Il, R0 represents the sampling resistor, and Vout represents the sampled voltage, then：Vout
=Il*R0.
Further, the detection unit includes short detection unit and over-current detection unit；
The short detection unit, it is connected respectively with the signal sampling unit and the hardware protection unit, is used for
When detecting that the sampled voltage reaches default short-circuit voltage threshold value, the first high level signal is exported；
The over-current detection unit, it is connected respectively with the signal sampling unit and the hardware protection unit, is used for
When detecting that the sampled voltage reaches default excessively stream voltage threshold, the second high level signal is exported.
Further, the discharge current hardware protection circuit also includes fault recovery unit；
The fault recovery unit, is connected with the over-current detection unit, for detecting the second high level letter
Start timing after number, after default time threshold is reached, output recovers signal and is used to control the over-current detection unit to export
Power supply signal；
The hardware protection unit turns on the lithium battery group and the vehicle load after the power supply signal is detected
Connection, the lithium battery group powers to the vehicle load.
Further, the short detection unit includes first resistor, second resistance, 3rd resistor, the 4th resistance, first
Comparator, the first power supply, the first diode, the second diode and the first electric capacity；
First output end of the signal sampling unit accesses the anti-phase of the first comparator by the first resistor
Input；Second output end of the signal sampling unit accesses the same mutually defeated of the first comparator by the 3rd resistor
Enter end；First power supply accesses the inverting input of the first comparator by the second resistance；First electric capacity
First end ground connection, the second of first electric capacity terminates the in-phase input end into the first comparator；One or two pole
The positive pole of pipe connects the output end of the first comparator, and the negative pole of first diode connects the hardware protection unit
Input；The positive pole of second diode connects the output end of the first comparator by the 4th resistance, and described the
The negative pole of two diodes connects the in-phase input end of the first comparator.
Further, the over-current detection unit includes the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, second
Power supply, the second comparator, the 3rd diode, the 4th diode and the second electric capacity；
First output end of the signal sampling unit accesses the anti-phase of second comparator by the 5th resistance
Input；Second output end of the signal sampling unit accesses the same mutually defeated of second comparator by the 7th resistance
Enter end；The second source accesses the inverting input of second comparator by the 6th resistance；Second electric capacity
First end ground connection, the second of second electric capacity terminates the in-phase input end into second comparator；Three or two pole
The positive pole of pipe connects the output end of second comparator, and the negative pole of the 3rd diode connects the hardware protection unit
Input；The positive pole of 4th diode connects the output end of second comparator by the 8th resistance, and described the
The negative pole of four diodes connects the in-phase input end of second comparator.
Further, the fault recovery unit includes processor, the 9th resistance, the tenth resistance and the 6th field effect transistor
Pipe；
The input of the processor connects the output end of second comparator, and the processor output end passes through described
9th resistance is connected to the grid of the 6th field-effect transistor；First end connection the 6th effect of tenth resistance
Answer the grid of transistor, the second end ground connection of the tenth resistance；The source ground of 6th field-effect transistor, described
The output end for being connected to second comparator that the drain electrode of six field-effect transistors passes through the 8th resistance.
Further, the 6th field-effect transistor is N-channel MOS pipe.
Further, the hardware protection unit include the first field-effect transistor, the second field-effect transistor, the 3rd
Effect transistor, the 4th field-effect transistor, the 5th field-effect transistor, the 11st resistance, the 12nd resistance, the 13rd resistance
With the 3rd power supply；
The grid of first field-effect transistor connects the output end of the detection unit, first field effect transistor
The drain electrode of pipe connects the grid of second field-effect transistor, the source ground of first field-effect transistor；Described
The first end of 11 resistance connects the drain electrode of first field-effect transistor, the second end ground connection of the 11st resistance；Institute
The drain electrode that the 3rd power supply is connected to second field-effect transistor by the 12nd resistance is stated, second field-effect is brilliant
The source ground of body pipe；The drain electrode of 3rd field-effect transistor connects the 3rd power supply by the 13rd resistance,
The grid of 3rd field-effect transistor connects the drain electrode of second field-effect transistor, the 3rd field-effect transistor
Source electrode connect the drain electrode of the 4th field-effect transistor；Described second of the grid connection of 4th field-effect transistor
The drain electrode of effect transistor, the source ground of the 4th field-effect transistor；The grid of 5th field-effect transistor connects
The source electrode of the 3rd field-effect transistor is connect, the drain electrode of the 5th field-effect transistor connects the negative of the lithium battery group
End, the source electrode of the 5th field-effect transistor connect the load ground terminal of the vehicle load.
Further, first field-effect transistor, second field-effect transistor, the 3rd field effect transistor
Pipe and the 5th field-effect transistor are N-channel MOS pipe, and the 4th field-effect transistor is P-channel metal-oxide-semiconductor.
Compared with prior art, beneficial effect is the present invention：The present invention can ensure when the lithium battery group of vehicle occurs
During such as the situation of short circuit or excessively stream, hardware protection unit can timely respond to, and automatically cut off the company of lithium battery group and vehicle load
Connect, without being controlled by CPU software, battery can be protected in real time；Even if exception occurs in CPU software, remain unaffected.Enter one
Step, the introducing of positive feedback in detection unit so that output signal is relatively more stable, once detection unit locking lithium battery group occurs
Abnormal i.e. output high level, even if current fluctuation there will not be influence, the signal of output is still constant, unless being unlocked using software
Output signal can be changed, the reliability of system can be greatly improved by the present invention.
Brief description of the drawings
Fig. 1 is a kind of discharge current hardware protection circuit of electric-vehicle-mounted lithium battery group provided in an embodiment of the present invention
Structural representation.
Fig. 2 is the structural representation of signal sampling unit provided in an embodiment of the present invention.
Fig. 3 is the structural representation of short detection unit provided in an embodiment of the present invention.
Fig. 4 is the structural representation of over-current detection unit provided in an embodiment of the present invention and fault recovery unit.
Fig. 5 is the structural representation of hardware protection unit provided in an embodiment of the present invention.
Fig. 6 is the workflow diagram of fault recovery unit provided in an embodiment of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The present invention provides a kind of circuit of hardware automatic protection, in the case where excessively stream or short circuit occurs in electric current, by hard
Part automatically cuts off cell switch, plays a part of protecting battery, and based on this, the invention provides as shown in Figure 1 a kind of electronic
The discharge current hardware protection circuit of car car lithium battery group, including：
Signal sampling unit 1, for being sampled to the load current of electric car, and the sample rate current is converted into and adopted
Exported after sample voltage；
Detection unit 2, it is connected with signal sampling unit 1, for detecting that the sampled voltage reaches default threshold
During value, high level signal is exported.More specifically, detection unit 2 includes short detection unit 21 and over-current detection unit 22；Short circuit
Detection unit 21, it is connected respectively with signal sampling unit 1 and hardware protection unit 3, for detecting the sampled voltage
When reaching default short-circuit voltage threshold value, the first high level signal is exported；Over-current detection unit 22, respectively with signal sampling unit
1 is connected with hardware protection unit 3, for when detecting that the sampled voltage reaches default excessively stream voltage threshold, exporting
Second high level signal.
Hardware protection unit 3, it is connected respectively with the lithium battery group, detection unit 2 and vehicle load, for detecting
After the high level signal, the connection of the lithium battery group and the vehicle load is cut off.
Further, load current is changed into sampling by signal sampling unit 1 by the powerful sampling resistor of small resistance
Voltage, used for detection unit 2.Signal sampling unit 1 includes the sampling resistor being connected in vehicle load, structure such as Fig. 2 institutes
Show, the load current is represented with Il, R0 represents the sampling resistor, and Vout represents the sampled voltage, then：
Vout=Il*R0；------(1)
Wherein：Vout is the voltage of sample voltage value, i.e. sampling resistor R0 both ends that signal sampling unit 1 exports.
Further, in order to the company of lithium battery group and vehicle load is disconnected because of excessively stream in hardware protection unit 3
Connect, restored electricity in time after electric current is stable and ensure the timely operation of electric car, the discharge current hardware protection circuit also wraps
Fault recovery unit 4 is included, is connected with over-current detection unit 22, based on starting after second high level signal is detected
When, after default time threshold is reached, output recovers signal and is used to control over-current detection unit 22 to export power supply signal；Hardware
Protection location 3 turns on the connection of the lithium battery group and the vehicle load, the lithium electricity after the power supply signal is detected
Vehicle load described in Chi Zuxiang is powered.
As shown in figure 3, short detection unit 21 includes first resistor R5, second resistance R6,3rd resistor R4, the 4th resistance
R1, first comparator U1, the first power supply VCC3.3, the first diode D1, the second diode D2 and the first electric capacity C1；Signal sampling
First output end of unit 1 accesses first comparator U1 inverting input by first resistor R5；The of signal sampling unit 1
Two output ends access first comparator U1 in-phase input end by 3rd resistor R4；First power supply VCC3.3 passes through second resistance
R6 access first comparators U1 inverting input；First electric capacity C1 first end ground connection, the second of the first electric capacity C1 terminate into
First comparator U1 in-phase input end；First diode D1 positive pole connection first comparator U1 output end, the one or two pole
The input of pipe D1 negative pole connection hardware protection unit 1；Second diode D2 positive pole passes through the 4th resistance R1 connections first
Comparator U1 output end, the second diode D2 negative pole connection first comparator U1 in-phase input end.
The detection realization principle of short detection unit 21 is further explained：In Fig. 3, first comparator is represented with V1
U1 anti-phase terminal voltage, V2 represent first comparator U1 in-phase end voltage, then：
First comparator U1 anti-phase terminal voltage is：
V1=R5/ (R5+R6) * VCC3.3=0.3V；------(2)
Wherein, R5=30K Ω, R6=300K Ω, VCC3.3=3.3V；
First comparator U1 in-phase end voltage is：
V2=Il*R0；------(3)
Wherein Il is load current, R0=2m Ω.From formula (1), the voltage of first comparator U1 in-phase ends is equal to
The sampled voltage of signal sampling unit 1, i.e. V2=Vout.
3rd resistor R4 and the first electric capacity C1 in Fig. 3 play a part of to filter and isolated, as V2 ＞ V1, first comparator
U1 in-phase end voltage is higher than anti-phase terminal voltage, and now first comparator U1 output end SN exports the first high level signal.Institute
State input signal of first high level signal as hardware protection unit 3, hardware protection unit 3 is high according to described the first of input
Connection between the negative terminal BAT- of level signal cut-out lithium battery group and the load GND of vehicle load so that lithium battery group can not
Powered to vehicle load, have the function that protection.From above-mentioned formula (1) and formula (2), as V2 ＞ V1, i.e. Il*R0 ＞
When 0.3, first comparator U1 exports the first high level signal, therefore, load current during V2=V1 is considered short circuit current,
The short circuit current is designated as Is, is designated as Vouts with the sampled voltage of now signal sampling unit 1, reaches short-circuit voltage, i.e.,
Vouts=Is*R0=0.3V, wherein R0=20m Ω, can calculate short circuit current Is=150A, have above-mentioned formula (1),
(2), (3) are understood, short circuit current Is value threshold value can be changed by changing R5, R6 value ratio.
As shown in figure 4, over-current detection unit 22 includes the 5th resistance R15, the 6th resistance R16, the 7th resistance R14, the 8th
Resistance R10, second source VCC3.3, the second comparator U2, the 3rd diode D3, the 4th diode D4 and the second electric capacity C10；Letter
First output end of number sampling unit 1 passes through the inverting input that the 5th resistance R15 accesses the second comparator U2；Signal sampling list
Second output end of member 1 accesses the second comparator U2 in-phase input end by the 7th resistance R14；Second source VCC3.3 passes through
6th resistance R16 accesses the second comparator U2 inverting input；Second electric capacity C10 first end ground connection, the second electric capacity C10's
Second terminates the in-phase input end into the second comparator U2；3rd diode D3 positive pole connects the second comparator U2 output
End, the input of the 3rd diode D3 negative pole connection hardware protection unit 3；4th diode D4 positive pole passes through the 8th resistance
R10 the second comparators of connection U2 output end, the 4th diode D4 negative pole connect the second comparator U2 in-phase input end.
Fault recovery unit 4 includes processor, the 9th resistance R11, the tenth resistance R12 and the 6th field effect transistor M 11；
The input of the processor connects the second comparator U2 output end, and the processor output end is connected by the 9th resistance R11
It is connected to the grid of the 6th field effect transistor M 11；Tenth resistance R12 first end connects the grid of the 6th field effect transistor M 11
Pole, the tenth resistance R12 the second end ground connection；The source ground of 6th field effect transistor M 11, the 6th field effect transistor M 11
Drain electrode pass through the 8th resistance R10 output end for being connected to the second comparator U2.
The detection realization principle of over-current detection unit 22 is further explained：As shown in figure 4, over-current detection unit 22
Operation principle it is identical with the operation principle of short detection unit 21, but overcurrent Id is smaller than short circuit current Is；When negative
When load electric current is more than overcurrent Id, the second comparator U2 in-phase ends voltage is higher than anti-phase terminal voltage, now the second comparator U2
Export the second high level signal, input signal of second high level signal as hardware protection unit 3, hardware protection unit
3 cut off according to second high level signal of input between the negative terminal BAT- of lithium battery group and the load GND of vehicle load
Connection so that lithium battery group is powered without normal direction vehicle load, has the function that protection.
In Fig. 4, the 7th resistance R14 and the second electric capacity C11 play a part of to filter and isolated, and the second comparator U2 is represented with V3
Anti-phase terminal voltage, V4 represent the second comparator in-phase end voltage, then：
V3=R15/ (R15+R16) * VCC3.3=0.127V；------(4)
Wherein, R15=30K Ω, R16=750K Ω, VCC3.3=3.3V；
When the second comparator U2 in-phase end voltage V4 is identical with anti-phase terminal voltage V3, it is by load current now
Overcurrent, overcurrent are represented with Id, using the sampled voltage of now voltage sampling unit 1 output as excessively stream voltage, with Voutd
Represent, i.e.,：
V3=Voutd=Id*R0；------(5)
Wherein R0=20m Ω, Id=63.5A can be calculated, i.e. overcurrent is 63.5A, similarly, change R15,
R16 value ratio can change the value threshold value of overcurrent.
As shown in figure 5, hardware protection unit 3 includes the first field effect transistor M 1, the second field effect transistor M the 2, the 3rd
Field effect transistor M 3, the 4th field effect transistor M 4, the 5th field effect transistor M 5, the 11st resistance R8, the 12nd resistance
R9, the 13rd resistance R13 and the 3rd power supply VCC3.3；The output of the grid connecting detection unit 2 of first field effect transistor M 1
End, the grid of drain electrode the second field effect transistor M 2 of connection of the first field effect transistor M 1, the first field effect transistor M 1
Source ground；The drain electrode of 11st resistance R8 first end the first field effect transistor M 1 of connection, the second of the 11st resistance R8
End ground connection；3rd power supply VCC3.3 is connected to the drain electrode of the second field effect transistor M 2, second effect by the 12nd resistance R9
Answer transistor M2 source ground；The drain electrode of 3rd field effect transistor M 3 passes through the power supply of the 13rd resistance R13 connections the 3rd
VCC3.3, the grid of the 3rd field effect transistor M 3 connect the drain electrode of the second field effect transistor M 2, the 3rd field-effect transistor
M3 source electrode connects the drain electrode of the 4th field effect transistor M 4；It is brilliant that the grid of 4th field effect transistor M 4 connects the second field-effect
Body pipe M2 drain electrode, the source ground of the 4th field effect transistor M 4；The grid of 5th field effect transistor M 5 connects the 3rd
Effect transistor M3 source electrode, the negative terminal BAT- of the drain electrode connection lithium battery group of the 5th field effect transistor M 5, the 5th
Effect transistor M5 source electrode connects the load ground terminal GND of the vehicle load.
Hardware protection unit 4 so works：When input (node H1) is high level, the first field-effect transistor
M1 is turned on, and now node H2 is low level, and the second field effect transistor M 2 is ended, and node H3 is high level, and the 4th field-effect is brilliant
Body pipe M4 is turned on, and node H4 is low level, causes the 5th field effect transistor M 5 to be ended, and now BAT- and GND disconnects, i.e. lithium electricity
Disconnect to the battery negative terminal of pond group and the load of vehicle load, lithium battery group is no longer powered for vehicle load.
With reference to above-mentioned statement and Fig. 6, the operation principle of fault recovery unit 4 is expanded on further:Processor detected in real time
Flow the output signal DN of detection unit 22；When DN is high level, hardware protection unit 3 opens work；Now processor starts
Timing, reach after the self- recoverage time (after reaching default time threshold), open software unblock, i.e. RU_DU_1 (electric discharge excessively streams
Controlling switch) output high level.When the output pin RU_DU_1 outputs of processor are high level, the 6th FET M11 is led
It is logical so that the voltage of the output end of over-current detection unit 22 is low, then the input H1 of hardware protection unit 3 is low level,
M1 ends, M2 conductings, and node H3 is low level, and M3 conductings, now node H4 is high level, and M5 is turned on, and BAT- is connected with GND,
I.e. lithium battery group connects with vehicle load, and lithium battery group is recovered to power to vehicle load.
In the present embodiment, the 6th field effect transistor M 11, the first field effect transistor M 1, the second field-effect transistor
M2, the 3rd field effect transistor M 3 and the 5th field effect transistor M 5 are N-channel MOS pipe；4th field effect transistor M 4 is P
Channel MOS tube；Processor is CPU.
In the present invention, positive feedback is introduced respectively in over-current detection unit 22 and short detection unit 21, when electric current is excessive,
Over-current detection unit 22 or short detection unit 21 export high level, positive feedback locking over-current detection unit 22 or short-circuit detecting list
The output signal of member 21.
After hardware protection unit 3 cuts off battery powered switch, detection unit (over-current detection unit 22 or short detection unit
21) output is locked, and now processor can unlock over-current detection unit 22 according to actual conditions, battery recovery is normally supplied
Electricity.
In excessively stream and short-circuit detecting, the purpose for introducing positive feedback is to prevent the sampled voltage of signal sampling unit 1 from believing
It is number unstable, cause comparator output unstable, positive feedback can play a part of stable output herein, once comparator output is high
Level, except non-software unlocks, even if otherwise in-phase end voltage is less than anti-phase terminal voltage, output can not equally be overturn.And detect single
After member 2 detects excessively stream, battery powered is cut off；After fault recovery unit 4 detects the second high level signal, delay a period of time
(failure self- recoverage time), automatic recovery of power supply, vehicle load are started working.After detection unit detects short circuit, fault recovery
Unit 4 can not recover, it is necessary to artificially fix a breakdown, can solve.
A kind of electric-vehicle-mounted lithium battery hardware automatic protection circuit provided by the invention, including signal sampling unit
(IN), short detection unit (SU), over-current detection unit (DU), hardware protection unit (HCU), cpu fault recovery unit (RU)；
The output of over-current detection unit and short detection unit connects the input of hardware protection unit, and cpu fault recovery unit is as excessively stream
The unlocking signal of detection unit, the output string of hardware protection unit is in battery negative terminal；After unblock, the output of short detection unit
(SN) and over-current detection unit output (DN) by load current change influenceed.Over-current detection unit and short detection unit inspection
When measuring load current and reaching threshold value, high level signal is exported, when hardware protection input signal is high level, automatically cuts off battery
Power switch.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (9)
1. a kind of discharge current hardware protection circuit of electric-vehicle-mounted lithium battery group, it is characterised in that the discharge current is hard
Part protection circuit includes：
Signal sampling unit, for being sampled to the load current of electric car, and after sample rate current is converted into sampled voltage
Output；
Detection unit, it is connected with the signal sampling unit, for detecting that the sampled voltage reaches default threshold value
When, export high level signal；
Hardware protection unit, after detecting the high level signal, cut off the connection of lithium battery group and vehicle load；
The hardware protection unit includes the first field-effect transistor, the second field-effect transistor, the 3rd field-effect transistor, the
Four field-effect transistors, the 5th field-effect transistor, the 11st resistance, the 12nd resistance, the 13rd resistance and the 3rd power supply；
The grid of first field-effect transistor connects the output end of the detection unit, first field-effect transistor
Drain electrode connects the grid of second field-effect transistor, the source ground of first field-effect transistor；Described 11st
The first end of resistance connects the drain electrode of first field-effect transistor, the second end ground connection of the 11st resistance；Described
Three power supplys are connected to the drain electrode of second field-effect transistor, second field-effect transistor by the 12nd resistance
Source ground；The drain electrode of 3rd field-effect transistor connects the 3rd power supply by the 13rd resistance, described
The grid of 3rd field-effect transistor connects the drain electrode of second field-effect transistor, the source of the 3rd field-effect transistor
Pole connects the drain electrode of the 4th field-effect transistor；The grid of 4th field-effect transistor connects second field-effect
The drain electrode of transistor, the source ground of the 4th field-effect transistor；The grid connection institute of 5th field-effect transistor
The source electrode of the 3rd field-effect transistor is stated, the drain electrode of the 5th field-effect transistor connects the negative terminal of the lithium battery group, institute
The source electrode for stating the 5th field-effect transistor connects the load ground terminal of the vehicle load.
2. discharge current hardware protection circuit as claimed in claim 1, it is characterised in that the signal sampling unit includes string
The sampling resistor being associated in vehicle load；
The load current is represented with Il, R0 represents the sampling resistor, and Vout represents the sampled voltage, then：Vout=Il*
R0。
3. discharge current hardware protection circuit as claimed in claim 1, it is characterised in that the detection unit includes short circuit and examined
Survey unit and over-current detection unit；
The short detection unit, it is connected respectively with the signal sampling unit and the hardware protection unit, for examining
When measuring the sampled voltage and reaching default short-circuit voltage threshold value, the first high level signal is exported；
The over-current detection unit, it is connected respectively with the signal sampling unit and the hardware protection unit, for examining
When measuring the sampled voltage and reaching default excessively stream voltage threshold, the second high level signal is exported.
4. discharge current hardware protection circuit as claimed in claim 3, it is characterised in that the discharge current hardware protection electricity
Road also includes fault recovery unit；
The fault recovery unit, is connected with the over-current detection unit, for after second high level signal is detected
Start timing, after default time threshold is reached, output recovers signal and is used to control the over-current detection unit output power supply
Signal；
The hardware protection unit turns on the company of the lithium battery group and the vehicle load after the power supply signal is detected
Connect, the lithium battery group is powered to the vehicle load.
5. discharge current hardware protection circuit as claimed in claim 3, it is characterised in that the short detection unit includes the
One resistance, second resistance, 3rd resistor, the 4th resistance, first comparator, the first power supply, the first diode, the second diode and
First electric capacity；
First output end of the signal sampling unit accesses the anti-phase input of the first comparator by the first resistor
End；Second output end of the signal sampling unit accesses the homophase input of the first comparator by the 3rd resistor
End；First power supply accesses the inverting input of the first comparator by the second resistance；First electric capacity
First end is grounded, and the second of first electric capacity terminates the in-phase input end into the first comparator；First diode
Positive pole connect the output end of the first comparator, the negative pole of first diode connects the defeated of the hardware protection unit
Enter end；The positive pole of second diode connects the output end of the first comparator by the 4th resistance, and described second
The negative pole of diode connects the in-phase input end of the first comparator.
6. discharge current hardware protection circuit as claimed in claim 4, it is characterised in that the over-current detection unit includes the
Five resistance, the 6th resistance, the 7th resistance, the 8th resistance, second source, the second comparator, the 3rd diode, the 4th diode and
Second electric capacity；
First output end of the signal sampling unit accesses the anti-phase input of second comparator by the 5th resistance
End；Second output end of the signal sampling unit accesses the homophase input of second comparator by the 7th resistance
End；The second source accesses the inverting input of second comparator by the 6th resistance；Second electric capacity
First end is grounded, and the second of second electric capacity terminates the in-phase input end into second comparator；3rd diode
Positive pole connect the output end of second comparator, the negative pole of the 3rd diode connects the defeated of the hardware protection unit
Enter end；The positive pole of 4th diode connects the output end of second comparator by the 8th resistance, and the described 4th
The negative pole of diode connects the in-phase input end of second comparator.
7. discharge current hardware protection circuit as claimed in claim 6, it is characterised in that the fault recovery unit includes place
Manage device, the 9th resistance, the tenth resistance and the 6th field-effect transistor；
The input of the processor connects the output end of second comparator, and the output end of the processor passes through described the
Nine resistance are connected to the grid of the 6th field-effect transistor；The first end of tenth resistance connects the 6th field-effect
The grid of transistor, the second end ground connection of the tenth resistance；The source ground of 6th field-effect transistor, the described 6th
The output end for being connected to second comparator that the drain electrode of field-effect transistor passes through the 8th resistance.
8. discharge current hardware protection circuit as claimed in claim 7, it is characterised in that the 6th field-effect transistor is
N-channel MOS pipe.
9. discharge current hardware protection circuit as claimed in claim 1, it is characterised in that first field-effect transistor,
Second field-effect transistor, the 3rd field-effect transistor and the 5th field-effect transistor are N-channel MOS
Pipe, the 4th field-effect transistor is P-channel metal-oxide-semiconductor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610165160.0A CN105680520B (en) | 2016-03-22 | 2016-03-22 | A kind of discharge current hardware protection circuit of electric-vehicle-mounted lithium battery group |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610165160.0A CN105680520B (en) | 2016-03-22 | 2016-03-22 | A kind of discharge current hardware protection circuit of electric-vehicle-mounted lithium battery group |
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| CN105680520A CN105680520A (en) | 2016-06-15 |
| CN105680520B true CN105680520B (en) | 2018-03-27 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106451367B (en) * | 2016-11-24 | 2018-09-25 | 欣旺达电子股份有限公司 | Lithium battery short-circuit protection method and system |
| DE102017205612A1 (en) * | 2017-04-03 | 2018-10-04 | Robert Bosch Gmbh | Method for controlling a separator of an electrochemical energy store |
| CN107521364A (en) * | 2017-08-21 | 2017-12-29 | 合肥力正新能源科技有限公司 | Dynamic low-temperature protection method for new energy automobile battery |
| CN107732868A (en) * | 2017-09-21 | 2018-02-23 | 广州金升阳科技有限公司 | A kind of overcurrent protection control method and overcurrent protective device |
| CN109850057A (en) * | 2019-04-11 | 2019-06-07 | 武汉小安科技有限公司 | Shared electric vehicle control protection electric circuit and terminal device |
| CN110456141A (en) * | 2019-08-28 | 2019-11-15 | 安徽贵博新能科技有限公司 | A kind of flash over-current detection circuit and its method |
| CN112103906B (en) * | 2020-06-15 | 2023-07-07 | 深圳天邦达科技有限公司 | Short-circuit protection circuit, power supply, electric equipment and short-circuit protection system |
| CN114172356A (en) * | 2020-09-10 | 2022-03-11 | 比亚迪股份有限公司 | Overload processing method and device for bidirectional DC/DC converter, storage medium and terminal |
| CN113131572B (en) * | 2021-04-15 | 2024-03-01 | 深圳卓锐思创科技有限公司 | Battery charge and discharge management system and method |
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