CN206452101U - A kind of binodal lithium battery protection circuit - Google Patents
A kind of binodal lithium battery protection circuit Download PDFInfo
- Publication number
- CN206452101U CN206452101U CN201720119969.XU CN201720119969U CN206452101U CN 206452101 U CN206452101 U CN 206452101U CN 201720119969 U CN201720119969 U CN 201720119969U CN 206452101 U CN206452101 U CN 206452101U
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- China
- Prior art keywords
- protection circuit
- lithium battery
- binodal lithium
- resistance
- pin
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The utility model is related to a kind of binodal lithium battery protection circuit; including a protection circuit with once protection chip U1; the discharge and recharge that protection circuit is used for binodal lithium battery is monitored; prevent binodal lithium battery is overcharged and crossed from putting; wherein; binodal lithium battery protection circuit also includes second protection circuit, the charge circuit for disconnecting binodal lithium battery in the case where a protection circuit fails and charging voltage is too high.The utility model can be continued to play lithium battery the effect of being effectively protected after a protection circuit goes wrong by second protection circuit.The utility model circuit is simple, and manufacturing cost is low, with good practicality.
Description
Technical field
The utility model is related to a kind of binodal lithium battery protection circuit.
Background technology
Existing binodal lithium battery only has single protection circuit, and such as protection circuit component damage causes internal short-circuit, then
Lithium battery can not be played a protective role, lithium battery output terminal shortcircuit or to lithium battery overcharge after, may cause lithium electricity
Pond is on fire or explodes.
Utility model content
The utility model aims to provide a kind of binodal lithium battery protection circuit, to solve existing protection circuit in its own member
The problem of protection to lithium battery can not be provided again in the case of device failure.Therefore, the utility model uses following technical side
Case：A kind of binodal lithium battery protection circuit a, it may include protection circuit with once protection chip U1, it is described once to protect
The discharge and recharge that circuit is used for binodal lithium battery is monitored, and prevents binodal lithium battery is overcharged and crossed from putting, wherein, the binodal lithium
Battery protecting circuit also includes second protection circuit, for breaking in the case where a protection circuit fails and charging voltage is too high
Charge circuit is opened, the secondary circuit, which includes second protection chip U2, current-limiting resistance R4 and R6, FET Q2 and fusing, to be protected
Dangerous silk FP1, the second protection chip U2 have at least two voltage measurement pin Vc1 and Vc2, VDD pin, one
VSS pins and an output pin Cout, fuse wire FP1 are connected between encapsulation positive pole P+ and anode B+, and one
Secondary protection chip U1 one current-limiting resistance R2 of power pins Vdd series connection is connected between fuse wire FP1 and anode B+, and two
Secondary protection chip U2 VDD pins are connected between fuse wire FP1 and anode B+, VSS pins ground connection, current-limiting resistance
The ends of R4 mono- are connected between fuse wire FP1 and anode B+, and an end is connected to voltage measurement pin Vc1, current-limiting resistance R6 mono-
The series connection point BC of two batteries is connected to, another grid for being connected to voltage measurement pin Vc2, FET Q2 is connected to output
Pin Cout, source collection ground connection, leakage collection is connected to fuse wire FP1 intermediate contact, when voltage measurement pin Vc1 and Vc2 detection
When the voltage arrived is higher than the charging voltage of battery permission and exceedes the scheduled time, output pin Cout output high level, field-effect
Pipe Q2 is turned on, and then fuse wire FP1 is fused.
Further, binodal lithium battery protection circuit may also include electric capacity C5 and C6, the ends of electric capacity C5 mono- be connected to resistance R4 with
Another to be connected between resistance R6 and voltage measurement pin Vc2 between voltage measurement pin Vc1, electric capacity C6 one end ground connection is another
It is connected between resistance R6 and voltage measurement pin Vc2.
Further, binodal lithium battery protection circuit may also include resistance R5 and electric capacity C4, and the ends of resistance R5 mono- are connected to fusing
Between fuse FP1 and anode B+, another termination VDD pins, the termination VDD pins of electric capacity C4 mono-, other end ground connection.
Further, the second protection chip U2 is chip R5435N302BA.
Further, the FET Q2 is FET AO3400.
The utility model uses above-mentioned technical proposal, has an advantageous effect in that, the utility model can protected once
After circuit goes wrong, continue to play lithium battery the effect of being effectively protected by second protection circuit.The utility model circuit
Simply, manufacturing cost is low, with good practicality.
Brief description of the drawings
Fig. 1 shows the circuit diagram of the binodal lithium battery protection circuit according to the utility model embodiment.
Embodiment
To further illustrate each embodiment, the utility model is provided with accompanying drawing.These accompanying drawings are in the utility model is disclosed
A part for appearance, it is mainly to illustrate embodiment, and running of the associated description of specification to explain embodiment can be coordinated former
Reason.Coordinate and refer to these contents, those of ordinary skill in the art will be understood that other possible embodiments and this practicality are new
The advantage of type.Component in figure is not necessarily to scale, and similar element numbers are conventionally used to indicate similar component.
The utility model is further illustrated in conjunction with the drawings and specific embodiments.Reference picture 1, binodal li-ion cell protection
Circuit may include a protection circuit 10 with once protection chip U1, and one time protection circuit 10 is used for binodal lithium battery 30
Discharge and recharge be monitored, prevent binodal lithium battery is overcharged and crossed from putting.One time protection circuit 10 belongs to prior art, its specific electricity
Line structure and operation principle are no longer further described herein.Binodal lithium battery protection circuit also includes second protection circuit 20,
Second protection circuit 20 is used to disconnect binodal lithium battery 30 in the case where a protection circuit 10 fails and charging voltage is too high
Charge circuit.Secondary circuit 20 includes second protection chip U2, current-limiting resistance R4 and R6, FET Q2 and fusing insurance
Silk FP1.Second protection chip U2 has three voltage measurement pin Vc1, Vc2 and Vc3, VDD pins, a VSS pins
And an output pin Cout.In the present embodiment, voltage measurement pin Vc1 and Vc2 are only used, and voltage measurement pin
Vc3 is grounded.Preferably, second protection chip U2 is the commercially available chip R5435N302BA of in the market.Fuse wire FP1 goes here and there
It is associated between encapsulation positive pole P+ and anode B+, when it fuses, the connection of battery and external loading or charger is disconnected.
Once protection chip U1 power pins Vdd connect a current-limiting resistance R2 be connected to fuse wire FP1 and anode B+ it
Between, to provide once protection chip U1 working power.Equally, second protection chip U2 VDD pins are connected to fuse wire
Between FP1 and anode B+, VSS pins ground connection, to provide second protection chip U2 working power.Current-limiting resistance R4 one end
It is connected between fuse wire FP1 and anode B+, an end is connected to voltage measurement pin Vc1, current-limiting resistance R6 mono- ends and is connected to
The series connection point BC of two batteries, another to be connected to voltage measurement pin Vc2, therefore, second protection chip U2 can pass through voltage
Measure the voltage of pin Vc1 and Vc2 measurement binodal lithium battery 30.FET Q2 grid is connected to output pin Cout, source collection
Ground connection, leakage collection is connected to fuse wire FP1 intermediate contact.Preferably, FET Q2 is FET AO3400, but its
Can be the FET of other models or the triode with similar functions.Detected as voltage measurement pin Vc1 and Vc2
When voltage is higher than the charging voltage of battery permission and exceedes the scheduled time, output pin Cout output high level, FET Q2
Conducting, and then fuse wire FP1 is fused.
In addition, binodal lithium battery protection circuit may also include electric capacity C5 and C6, the ends of electric capacity C5 mono- are connected to resistance R4 and voltage
Measure between pin Vc1, another to be connected between resistance R6 and voltage measurement pin Vc2, electric capacity C6 one end is grounded, another termination
To between resistance R6 and voltage measurement pin Vc2.Electric capacity C5 and C6 are used for filtering voltage regulation, so that second protection chip U2 voltage
The voltage that measurement pin Vc1 and Vc2 are measured will not be improved by noise jamming, the degree of accuracy.
In addition, binodal lithium battery protection circuit may also include resistance R5 and electric capacity C4, the ends of resistance R5 mono- are connected to fusing insurance
Between silk FP1 and anode B+, another termination second protection chip U2 VDD pins, the termination second protection cores of electric capacity C4 mono-
Piece U2 VDD pins, other end ground connection.Resistance R5 and electric capacity C4 is used for current limliting and voltage stabilizing, to protect second protection chip U2 not
Can be because the operating current of input is excessive and damages.
It is preferable to carry out it should be noted that the numerical value of each resistance and electric capacity shown in Fig. 1 is only one of the present utility model
Example, and be not necessarily to be construed as to limitation of the present utility model.
Although specifically showing and describing the utility model with reference to preferred embodiment, those skilled in the art should
This is understood, is not departing from the spirit and scope of the present utility model that appended claims are limited, in form and details
On the utility model can be made a variety of changes, be protection domain of the present utility model.
Claims (5)
1. a kind of binodal lithium battery protection circuit, including a protection circuit with once protection chip U1, described once to protect
The discharge and recharge that protection circuit is used for binodal lithium battery is monitored, and prevents binodal lithium battery is overcharged and crossed from putting, it is characterised in that also
Including second protection circuit, for disconnecting binodal lithium battery in the case where a protection circuit fails and charging voltage is too high
Charge circuit, the secondary circuit includes second protection chip U2, current-limiting resistance R4 and R6, FET Q2 and fusing insurance
Silk FP1, the second protection chip U2 have at least two voltage measurement pin Vc1 and Vc2, VDD pins, a VSS
Pin and an output pin Cout, fuse wire FP1 are connected between encapsulation positive pole P+ and anode B+, are once protected
Shield chip U1 one current-limiting resistance R2 of power pins Vdd series connection is connected between fuse wire FP1 and anode B+, secondary to protect
Shield chip U2 VDD pins are connected between fuse wire FP1 and anode B+, VSS pins ground connection, current-limiting resistance R4 one end
It is connected between fuse wire FP1 and anode B+, an end is connected to voltage measurement pin Vc1, current-limiting resistance R6 mono- ends and is connected to
The series connection point BC of two batteries, another to be connected to voltage measurement pin Vc2, FET Q2 grid is connected to output pin
Cout, source collection ground connection, leakage collection is connected to fuse wire FP1 intermediate contact, is detected as voltage measurement pin Vc1 and Vc2
When voltage is higher than the charging voltage of battery permission and exceedes the scheduled time, output pin Cout output high level, FET Q2
Conducting, and then fuse wire FP1 is fused.
2. binodal lithium battery protection circuit as claimed in claim 1, it is characterised in that also including electric capacity C5 and C6, electric capacity C5
One end is connected between resistance R4 and voltage measurement pin Vc1, another to be connected between resistance R6 and voltage measurement pin Vc2, electricity
Hold C6 one end ground connection, it is another to be connected between resistance R6 and voltage measurement pin Vc2.
3. binodal lithium battery protection circuit as claimed in claim 1 or 2, it is characterised in that also including resistance R5 and electric capacity C4,
The ends of resistance R5 mono- are connected between fuse wire FP1 and anode B+, another termination VDD pins, and the terminations of electric capacity C4 mono- VDD draws
Pin, other end ground connection.
4. binodal lithium battery protection circuit as claimed in claim 1, it is characterised in that the second protection chip U2 is chip
R5435N302BA。
5. the binodal lithium battery protection circuit as described in claim 1 or 4, it is characterised in that the FET Q2 is imitated for field
Should pipe AO3400.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720119969.XU CN206452101U (en) | 2017-02-09 | 2017-02-09 | A kind of binodal lithium battery protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720119969.XU CN206452101U (en) | 2017-02-09 | 2017-02-09 | A kind of binodal lithium battery protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206452101U true CN206452101U (en) | 2017-08-29 |
Family
ID=59666588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720119969.XU Expired - Fee Related CN206452101U (en) | 2017-02-09 | 2017-02-09 | A kind of binodal lithium battery protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206452101U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109546626A (en) * | 2018-12-27 | 2019-03-29 | 北斗天地股份有限公司山东分公司 | A kind of battery and its protection circuit, mine anti-explosion smart phone |
| CN109638903A (en) * | 2018-11-29 | 2019-04-16 | 北斗天地股份有限公司山东分公司 | A kind of battery and its protection circuit, intrinsic safety type smart phone |
| CN110391644A (en) * | 2018-04-19 | 2019-10-29 | 凹凸电子（武汉）有限公司 | Battery protection system, battery pack and guard method |
-
2017
- 2017-02-09 CN CN201720119969.XU patent/CN206452101U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110391644A (en) * | 2018-04-19 | 2019-10-29 | 凹凸电子（武汉）有限公司 | Battery protection system, battery pack and guard method |
| US10978867B2 (en) | 2018-04-19 | 2021-04-13 | 02Micro Inc. | Battery protection systems |
| CN110391644B (en) * | 2018-04-19 | 2022-04-26 | 凹凸电子（武汉）有限公司 | Battery protection system, battery pack and protection method |
| CN109638903A (en) * | 2018-11-29 | 2019-04-16 | 北斗天地股份有限公司山东分公司 | A kind of battery and its protection circuit, intrinsic safety type smart phone |
| CN109546626A (en) * | 2018-12-27 | 2019-03-29 | 北斗天地股份有限公司山东分公司 | A kind of battery and its protection circuit, mine anti-explosion smart phone |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170829 Termination date: 20200209 |
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| CF01 | Termination of patent right due to non-payment of annual fee |