CN206471812U - A kind of battery pack protection circuit - Google Patents
A kind of battery pack protection circuit Download PDFInfo
- Publication number
- CN206471812U CN206471812U CN201621067353.4U CN201621067353U CN206471812U CN 206471812 U CN206471812 U CN 206471812U CN 201621067353 U CN201621067353 U CN 201621067353U CN 206471812 U CN206471812 U CN 206471812U
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- resistance
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- nmos tube
- battery pack
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- 238000001514 detection method Methods 0.000 claims abstract description 27
- 230000002265 prevention Effects 0.000 claims abstract description 24
- 230000005611 electricity Effects 0.000 claims description 5
- 239000003381 stabilizer Substances 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 9
- 229910052744 lithium Inorganic materials 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Protection Of Static Devices (AREA)
Abstract
The utility model discloses a kind of battery pack protection circuit, including power circuit, detection circuit and control circuit, power circuit connects the detection circuit and the control circuit respectively, for being that detection circuit and control circuit provide operating voltage；Detection circuit is with controlling circuit to be connected, for detecting battery voltage, and overcharges signal to the control circuit output management and control according to battery voltage and discharge signal is crossed in management and control；Control circuit is used to overcharge the break-make that signal controls battery pack charge circuit according to the management and control received, and crosses the break-make that discharge signal controls battery power discharge loop according to the management and control received.Using the utility model, realize battery pack is overcharged with less component and Cross prevention effect, effectively saved production cost.
Description
Technical field
The utility model is related to technical field of circuit design, more particularly to a kind of battery pack protection circuit.
Background technology
Lithium battery has the advantages that capacity height, small volume, lightweight, and the lithium battery group being made up of polylith lithium cells is then
Many fields are applied to its higher capacity, such as in electric car, it is possible to use lithium battery group replaces traditional lead
Sour battery.But because the internal energy density of lithium battery group is high, under overcharged state, internal heat accumulation is excessively possible to
Damage battery performance and service life.Therefore lithium battery group is typically necessary special circuit and carries out various management to it, for example
Occur overcharging in lithium battery group, cross put, the situation such as excessively stream when effectively protected；And these circuits are by being arranged on lithium battery group
In protection board.
The charging metal-oxide-semiconductor that current lithium battery group protection board circuit is usually provided with privacy protection chip and is connected electrically
And electric discharge metal-oxide-semiconductor, charging metal-oxide-semiconductor and the MOS that discharges on off state are controlled by privacy protection chip.Using privacy protection core
Piece, can make the cost of circuit higher.
Utility model content
Technical problem to be solved in the utility model is, there is provided a kind of battery pack protection circuit, to can be used less
Component, realizes and the defencive function put is overcharged and crossed to battery pack, and battery pack protection plate cost is high in the prior art asks for solution
Topic.
In order to solve the above-mentioned technical problem, the utility model provides a kind of battery pack protection circuit, including power circuit,
And the detection circuit that is connected respectively with battery pack and control circuit, the power circuit connects the detection circuit and institute respectively
Control circuit is stated, for being that the detection circuit and control circuit provide operating voltage；The detection circuit and the control electricity
Road is connected, and signal and pipe are overcharged to the control circuit output management and control for detecting battery voltage, and according to battery voltage
Controlled discharge signal；The control circuit is used to overcharge the break-make that signal controls battery pack charge circuit according to the management and control received,
And the break-make in discharge signal control battery power discharge loop is crossed according to the management and control received.
The detection circuit includes amplifier follower, battery protection ic, and from the detection circuit voltage input successively
Connect first resistor, second resistance, the 3rd resistor of ground connection, the tie point of the second resistance and the 3rd resistor with it is described
The input connection of amplifier follower, the output end of the amplifier follower connects the battery protection ic；The battery protection
IC includes being used to export the second pin that management and control overcharges the first pin of signal and crosses discharge signal for exporting management and control, described first
Pin and second pin are connected with the control circuit respectively.
The control circuit includes overcharging control circuit and crossing putting control circuit.
It is described overcharge control circuit include resistance R4, resistance R5, resistance R6, resistance R7, NMOS tube Q1, PMOS Q2 and
Overcharge protection NMOS tube, the resistance R4 and resistance R5 be sequentially connected in series be arranged at circuit power and the NMOS tube Q1 drain electrode it
Between, the tie point of the resistance R4 and resistance R5 are connected with the grid of the PMOS Q2；The drain electrode connection of the PMOS Q2
Circuit power, source electrode connects the inspection through overcharging protection NMOS tube, the grid of the NMOS tube Q1 described in the resistance R6 connections
Slowdown monitoring circuit, source ground；The two ends of the resistance R7 connect the source electrode and grid for overcharging protection NMOS tube respectively.
The mistake put control circuit include resistance R8, resistance R9, resistance R10, resistance R11, NMOS tube Q3, PMOS Q4,
With Cross prevention NMOS tube, the resistance R8 and resistance R9 are sequentially connected in series the drain electrode for being arranged at circuit power and the NMOS tube Q3
Between, the tie point of the resistance R8 and resistance R9 are connected with the grid of the PMOS Q4；The drain electrode of the PMOS Q4 connects
Circuit power is connect, source electrode is through the resistance R10 connections Cross prevention NMOS tube；The grid connection of the NMOS tube Q3 is described
Detect circuit, source ground；The two ends of the resistance R11 connect the source electrode and grid of Cross prevention NMOS tube respectively.
The control circuit also includes voltage-stabiliser tube D1, electric capacity C1 and electric capacity C2, after electric capacity C1 and electric capacity the C2 series connection, two
End connects source electrode and the drain electrode of the Cross prevention NMOS tube respectively；The positive pole of the voltage-stabiliser tube D1 connects the Cross prevention
The source electrode of NMOS tube, its negative pole connects the drain electrode of the Cross prevention NMOS tube.
The power circuit includes resistance R12, resistance R13, resistance R14, diode D2, diode D3, electric capacity C3, electric capacity
C4, triode Q5, triode Q6；Resistance R12 mono- terminates power input, and the other end connects the positive pole of the diode D2, resistance
R13 two ends connect the negative pole of the diode D2 and triode Q6 colelctor electrode respectively；Resistance R14 two ends connect institute respectively
Diode D2 negative pole and diode D3 positive pole are stated, resistance R14 and diode D3 tie point connects with triode Q6 base stage
Connect, triode Q5 base stage connecting triode Q6 emitter stage, triode Q5 colelctor electrode connection diode D2 negative pole；Electric capacity
After C3 and electric capacity C4 is in parallel, two ends difference connecting triode Q5 emitter stage and diode D3 negative pole.
A kind of battery pack protection circuit provided using the utility model, battery voltage is detected by detection circuit, and
Signal is overcharged to the control circuit output management and control according to battery voltage and discharge signal is crossed in management and control；Circuit is controlled according to management and control
Fill signal and management and control crosses discharge signal to control the break-make of charge circuit and discharge loop.Detect used in circuit and control circuit
Component it is less, and all be low-power consumption component, realize to overcharge battery pack with less component and crossed and put guarantor
The effect of shield, has effectively saved production cost.
Brief description of the drawings
Fig. 1 is a kind of application principle block diagram of the embodiment for the battery pack protection circuit that the utility model is provided；
Fig. 2 be the utility model provide battery pack protection circuit a kind of embodiment in detect circuit composition structural frames
Figure；
Fig. 3 be the utility model provide battery pack protection circuit a kind of embodiment in control circuit circuit diagram；
Fig. 4 be the utility model provide battery pack protection circuit a kind of embodiment in power circuit circuit diagram.
Embodiment
Below with reference to the accompanying drawings preferred embodiment of the present utility model is described.It is different in the accompanying drawing of institute's reference
Identical part is represented using identical drawing reference numeral in figure.
Referring to Fig. 1, a kind of application principle block diagram of embodiment of the battery pack protection circuit provided for the utility model should
Battery pack protection circuit specifically includes power circuit 1, and the detection circuit 2 and control circuit 3 being connected respectively with battery pack, electricity
Source circuit 1 distinguishes connection detection circuit 2 and control circuit 3, and above-mentioned power circuit 1 is used to be that detection circuit 2 and control circuit 3 are carried
For operating voltage.Detection circuit 2 is with controlling circuit 3 to be connected, and it is used to detecting battery voltage, and according to battery voltage to control
The output of circuit 3 management and control processed overcharges signal and discharge signal is crossed in management and control.Control circuit 3 is used to overcharge signal control according to the management and control received
The break-make of battery pack charge circuit processed, and the break-make that discharge signal controls battery power discharge loop is crossed according to the management and control received.
As shown in Fig. 2 above-mentioned detection circuit 2 is defeated including amplifier follower 21, battery protection ic 22, and self-detection circuit 2
Enter resistance R1, resistance R2, resistance R3 that end is sequentially connected in series ground connection.Resistance R2 and resistance R3 tie point and amplifier follower 21
Input is connected, the output end connection battery protection ic 22 of amplifier follower 21；Battery protection ic 22 includes being used to export management and control
Overcharge the first pin of signal and the second pin of discharge signal crossed for exporting management and control, the first pin and second pin respectively with control
Circuit 3 processed is connected.Wherein, battery protection ic 22 can specifically use S-8261 or S-8211.
In the present embodiment, the voltage that resistance R3 is sampled is isolated by amplifier follower 21, is input to battery guarantor
Shield IC22 is judged.Overcharging threshold values, crossing and put threshold values, overcharge solution provided with different numerical value in the battery protection ic 22 of different model
Except threshold values, cross and put releasing threshold values.The first pin and second pin default duration of battery protection ic 22 export the management and control of high level
Overcharge signal and discharge signal is crossed in management and control, when the magnitude of voltage sampled is higher than threshold values is overcharged, the first pin of battery protection ic 22
Persistently low level management and control can be exported and overcharge signal, control circuit 3 receives low level management and control and overcharged after signal, and control is closed
The charge circuit of battery pack.Battery pack continuous discharge, when the magnitude of voltage that detection circuit 2 is sampled, which reaches, overcharges releasing threshold values,
The management and control of first pin output high level overcharges signal, opens charge circuit, protection is overcharged so as to release.When the magnitude of voltage of sampling
During less than putting threshold values excessively, the second pin of battery protection ic 22 can export persistently low level management and control and cross discharge signal, control circuit 3
Receive low level management and control to cross after discharge signal, the discharge loop of battery pack is closed in control.Battery pack persistently charges, when detection electricity
The magnitude of voltage that road 2 is sampled was reached when putting releasing threshold values, and discharge signal is crossed in the management and control of second pin output high level, opens electric discharge
Loop, releases Cross prevention state.
In the present embodiment, above-mentioned control circuit 3 includes overcharging control circuit and crossing putting control circuit.
As shown in figure 3, overcharging control circuit includes resistance R4, resistance R5, resistance R6, resistance R7, NMOS tube Q1, PMOS
Q2 and overcharge protection NMOS tube 32, resistance R4 and resistance R5 be sequentially connected in series be arranged at circuit power and NMOS tube Q1 drain electrode it
Between, resistance R4 and resistance R5 tie point are connected with PMOS Q2 grid；PMOS Q2 drain electrode connection circuit power, source electrode
Protection NMOS tube 32, the NMOS tube Q1 grid connection detection circuit 2, source ground are overcharged through the resistance R6 connections；Electricity
Resistance R7 two ends connect the source electrode and grid for overcharging protection NMOS tube 32 respectively.
Above-mentioned mistake put control circuit include resistance R8, resistance R9, resistance R10, resistance R11, NMOS tube Q3, PMOS Q4,
With Cross prevention NMOS tube 31, resistance R8 and resistance R9 are sequentially connected in series and are arranged between circuit power and NMOS tube Q3 drain electrode,
Resistance R8 and resistance R9 tie point are connected with PMOS Q4 grid；PMOS Q4 drain electrode connection circuit power, source electrode warp
Resistance R10 connection Cross preventions NMOS tube 31；The NMOS tube Q3 grid connection detection circuit 2, source ground；Resistance R11
Two ends connect the source electrode and grid of Cross prevention NMOS tube 31 respectively.
Further, control circuit 3 also includes voltage-stabiliser tube D1, electric capacity C1 and electric capacity C2, after electric capacity C1 and electric capacity C2 connect,
Two ends connect source electrode and the drain electrode of Cross prevention NMOS tube 31 respectively；Voltage-stabiliser tube D1 positive pole connection Cross prevention NMOS tube 31
Source electrode, its negative pole connects the drain electrode of the Cross prevention NMOS tube 31.
When the management and control to the control input high level of circuit 3 overcharges signal, it is conducting state to overcharge protection NMOS tube 32, when
When management and control overcharges signal for low level, overcharge protection NMOS tube 32 and be changed into cut-off state, control the charge circuit in circuit 3 to be closed
Close.When discharge signal is crossed in the management and control to the control input high level of circuit 3, Cross prevention NMOS tube 31 is conducting state, works as management and control
When crossing discharge signal for low level, the discharge loop that Cross prevention NMOS tube 31 is changed into cut-off state, control circuit 3 is closed.
Wherein, overcharge protection NMOS tube 32 and Cross prevention NMOS tube 31 is made up of at least two N station tracks power MOS pipes respectively, work(
The quantity of rate metal-oxide-semiconductor is determined with model by the voltage of battery pack and the lasting of discharge and recharge with immediate current.
As shown in figure 4, power circuit 1 includes resistance R12, resistance R13, resistance R14, diode D2, diode D3, electric capacity
C3, electric capacity C4, triode Q5, triode Q6；The termination battery voltage inputs of resistance R12 mono-, the other end connects the diode
D2 positive pole, resistance R13 two ends connect the negative pole of the diode D2 and triode Q6 colelctor electrode respectively；Resistance R14's
Two ends connect the negative pole of the diode D2 and diode D3 positive pole, resistance R14 and diode D3 tie point and three respectively
Pole pipe Q6 base stage connection, triode Q5 base stage connecting triode Q6 emitter stage, triode Q5 colelctor electrode connects two poles
Pipe D2 negative pole；After electric capacity C3 and electric capacity C4 is in parallel, two ends difference connecting triode Q5 emitter stage and diode D3 negative pole.
The input voltage range of the power circuit is wide, and 12V-50V can normally export stable 12V supply voltages, practical.
The utility model provide battery pack protection circuit, its detect circuit and control circuit used in component compared with
It is few, and be all low-power consumption component, realize battery pack is overcharged with less component and Cross prevention effect, have
Effect has saved production cost.
Above disclosed is only a kind of preferred embodiment of the utility model, can not limit this practicality with this certainly
New interest field, therefore the equivalent variations made according to the utility model claim, still belong to what the utility model was covered
Scope.
Claims (7)
1. a kind of battery pack protection circuit, it is characterised in that including power circuit (1), and the inspection being connected respectively with battery pack
Slowdown monitoring circuit (2) and control circuit (3),
The power circuit (1) connects the detection circuit (2) and the control circuit (3) respectively, for detecting electricity to be described
Road (2) and control circuit (3) provide operating voltage；
The detection circuit (2) is connected with the control circuit (3), for detecting battery voltage, and according to battery voltage
Signal is overcharged to control circuit (3) the output management and control and discharge signal is crossed in management and control；
The control circuit (3) is used to overcharge the break-make that signal controls battery pack charge circuit according to the management and control received, and
The break-make in discharge signal control battery power discharge loop is crossed in management and control according to receiving.
2. a kind of battery pack protection circuit as claimed in claim 1, it is characterised in that the detection circuit (2) includes amplifier
Follower (21), battery protection ic (22), and from it is described detection circuit (2) voltage input end be sequentially connected in series ground connection resistance R1,
Resistance R2, resistance R3,
The resistance R2 and the resistance R3 tie point are connected with the input of the amplifier follower (21), the amplifier with
The battery protection ic (22) is connected with the output end of device (21)；
The battery protection ic (22), which includes being used for exporting management and control overcharging the first pin of signal and crossing for exporting management and control, puts letter
Number second pin, first pin and second pin are connected with the control circuit (3) respectively.
3. a kind of battery pack protection circuit as claimed in claim 2, it is characterised in that the control circuit (3) includes overcharging
Control circuit and cross to put control circuit.
4. a kind of battery pack protection circuit as claimed in claim 3, it is characterised in that the control circuit that overcharges includes resistance
R4, resistance R5, resistance R6, resistance R7, NMOS tube Q1, PMOS Q2 and protection NMOS tube is overcharged,
The resistance R4 and resistance R5, which are sequentially connected in series, to be arranged between circuit power and the NMOS tube Q1 drain electrode, the resistance
R4 and resistance R5 tie point are connected with the grid of the PMOS Q2；
The PMOS Q2 drain electrode connection circuit power, source electrode through overcharging protection NMOS tube described in the resistance R6 connections,
The grid connection detection circuit (2) of the NMOS tube Q1, source ground；
The two ends of the resistance R7 connect the source electrode and grid for overcharging protection NMOS tube respectively.
5. a kind of battery pack protection circuit as claimed in claim 4, it is characterised in that the mistake, which puts control circuit, includes resistance
R8, resistance R9, resistance R10, resistance R11, NMOS tube Q3, PMOS Q4 and Cross prevention NMOS tube,
The resistance R8 and resistance R9, which are sequentially connected in series, to be arranged between circuit power and the NMOS tube Q3 drain electrode, the resistance
R8 and resistance R9 tie point are connected with the grid of the PMOS Q4；
The drain electrode connection circuit power of the PMOS Q4, source electrode is through the resistance R10 connections Cross prevention NMOS tube；
The grid connection detection circuit (2) of the NMOS tube Q3, source ground；
The two ends of the resistance R11 connect the source electrode and grid of Cross prevention NMOS tube respectively.
6. a kind of battery pack protection circuit as claimed in claim 5, it is characterised in that the control circuit (3) also includes steady
Pressure pipe D1, electric capacity C1 and electric capacity C2,
After electric capacity C1 and electric capacity the C2 series connection, two ends connect source electrode and the drain electrode of the Cross prevention NMOS tube respectively；
The positive pole of the voltage-stabiliser tube D1 connects the source electrode of the Cross prevention NMOS tube, and its negative pole connects the Cross prevention NMOS
The drain electrode of pipe.
7. a kind of battery pack protection circuit as claimed in claim 6, it is characterised in that the power circuit (1) includes resistance
R12, resistance R13, resistance R14, diode D2, diode D3, electric capacity C3, electric capacity C4, triode Q5, triode Q6；
Resistance R12 mono- terminates power input, and the other end connects the positive pole of the diode D2,
Resistance R13 two ends connect the negative pole of the diode D2 and triode Q6 colelctor electrode respectively；
Resistance R14 two ends connect the negative pole of the diode D2 and diode D3 positive pole, resistance R14 and diode D3 respectively
Tie point be connected with triode Q6 base stage,
Triode Q5 base stage connecting triode Q6 emitter stage, triode Q5 colelctor electrode connection diode D2 negative pole；
After electric capacity C3 and electric capacity C4 is in parallel, two ends difference connecting triode Q5 emitter stage and diode D3 negative pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621067353.4U CN206471812U (en) | 2016-09-20 | 2016-09-20 | A kind of battery pack protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621067353.4U CN206471812U (en) | 2016-09-20 | 2016-09-20 | A kind of battery pack protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206471812U true CN206471812U (en) | 2017-09-05 |
Family
ID=59709447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621067353.4U Active CN206471812U (en) | 2016-09-20 | 2016-09-20 | A kind of battery pack protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206471812U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110198060A (en) * | 2019-06-21 | 2019-09-03 | 惠州市亿兆能源科技有限公司 | Super-charge super-discharge protects circuit |
| CN110797937A (en) * | 2019-10-17 | 2020-02-14 | 南京金邦动力科技有限公司 | BMS charge and discharge management circuit |
-
2016
- 2016-09-20 CN CN201621067353.4U patent/CN206471812U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110198060A (en) * | 2019-06-21 | 2019-09-03 | 惠州市亿兆能源科技有限公司 | Super-charge super-discharge protects circuit |
| CN110797937A (en) * | 2019-10-17 | 2020-02-14 | 南京金邦动力科技有限公司 | BMS charge and discharge management circuit |
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