CN204407869U - Lithium battery secondary overvoltage protective circuit and lithium battery protection circuit - Google Patents
Lithium battery secondary overvoltage protective circuit and lithium battery protection circuit Download PDFInfo
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- CN204407869U CN204407869U CN201420796734.0U CN201420796734U CN204407869U CN 204407869 U CN204407869 U CN 204407869U CN 201420796734 U CN201420796734 U CN 201420796734U CN 204407869 U CN204407869 U CN 204407869U
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Abstract
The utility model relates to lithium battery secondary overvoltage protective circuit and lithium battery protection circuit.Lithium battery secondary voltage protective circuit, for carrying out secondary overvoltage protection to lithium battery, lithium battery has multiple batteries battery core, lithium battery secondary voltage protective circuit comprises voltage collection circuit, voltage comparator circuit, fuse and second protection switch, and voltage collection circuit obtains the voltage of each battery battery core in lithium battery; Voltage comparator circuit is output overvoltage detection signal when the magnitude of voltage of arbitrary battery battery core exceeds preset voltage value, and preset voltage value is greater than the overvoltage threshold values of the li-ion cell protection IC of lithium battery; Fuse is serially connected with between the total positive pole of charging Anode and battery battery core of lithium battery, and the control end of described second protection switch takes over pressure detection signal, one end of input termination fuse, output head grounding, and closed to blow a fuse according to overvoltage detection signal.Compared with prior art, the utility model is in li-ion cell protection IC fault and burn fusible link when overcharging, and effectively prevents lithium battery surcharge, safe and reliable.
Description
Technical field
The utility model relates to a kind of lithium battery protection circuit, especially designs the secondary overvoltage protection of lithium battery.
Background technology
In recent years, PDA, digital camera, mobile phone, the increasing product such as portable audio device and bluetooth equipment adopts lithium battery as main power source, it is little that lithium battery has volume, energy density is high, memory-less effect, cycle life is high, high-voltage battery and the advantage such as self-discharge rate is low, with NI-G, Ni-MH battery is not quite alike, lithium battery must consider charging, fail safe during electric discharge, to prevent deterioration in characteristics. overcharging for lithium battery, over-discharge can, overcurrent and short-circuit protection are very important, because lithium ion battery energy density is high, therefore the fail safe guaranteeing battery is difficult to, under overcharged state, after battery temperature rises, energy is by surplus, so electrolyte decomposition and produce gas, because interior pressing rises and the danger that spontaneous combustion occurs or breaks, otherwise under over-discharge state, electrolyte causes battery behavior and durability deterioration because decomposing, thus reduces chargeable number of times, the protective circuit of lithium ion battery be exactly to guarantee such overcharge and discharge condition time fail safe, and prevent deterioration in characteristics.
The protective circuit of traditional lithium ion battery generally comprises surcharge protection (overvoltage protection) and transient discharge protection (under-voltage protection); the protective circuit of lithium battery is made up of li-ion cell protection IC and two power MOSFET; wherein li-ion cell protection IC monitors cell voltage, when have overcharge and discharge condition time control corresponding power MOSFET action to cut off charge circuit or discharge loop.But when power MOSFET failed shorted, lithium battery protection circuit cannot normally work, and user is also difficult to place of pinpointing the problems, damage to make lithium battery may be in the state of overcharging for a long time and even cause danger.
Therefore, be badly in need of a kind of safe and reliable lithium battery protection circuit.
Utility model content
The purpose of this utility model is to provide a kind of safe and reliable lithium battery secondary voltage protective circuit.
Another object of the present utility model is to provide a kind of lithium battery protection circuit, and this lithium battery protection circuit has secondary overvoltage protection, safe and reliable.
In order to realize there is object, the utility model discloses a kind of lithium battery secondary voltage protective circuit, for carrying out secondary overvoltage protection to lithium battery, described lithium battery has multiple batteries battery core, described lithium battery secondary voltage protective circuit comprises voltage collection circuit, voltage comparator circuit, fuse and second protection switch, and described voltage collection circuit obtains the voltage of each battery battery core in described lithium battery; Described voltage comparator circuit compares voltage and the preset voltage value of each battery battery core, and when the magnitude of voltage of arbitrary described battery battery core exceeds preset voltage value by output output overvoltage detection signal, described preset voltage value is greater than the overvoltage threshold values of the li-ion cell protection IC of lithium battery; Described fuse is serially connected with between the total positive pole of charging Anode and battery battery core of described lithium battery; Overvoltage detection signal described in the control termination of described second protection switch, one end of fuse described in input termination, output head grounding, and close according to described overvoltage detection signal.
Compared with prior art; the utility model is provided with a kind of lithium battery secondary voltage protective circuit; for carrying out secondary overvoltage protection to lithium battery, not only can ensure when li-ion cell protection IC or two power MOSFET fault, the charging of available protecting lithium battery; prevent lithium battery surcharge to such an extent as to cause danger; safe and reliable, and when former li-ion cell protection lost efficacy, fusible link fuses; charge circuit open circuit, with reminding user lithium battery fault.
Preferably, described lithium battery has N batteries battery core, N be more than or equal to 2 integer, described voltage collection circuit comprises N-1 road voltage subtraction device, and the inverting input of voltage subtraction device described in N-1 road connects Section 2 saves described battery battery core cathode voltage to N respectively, the in-phase input end of voltage subtraction device described in N-1 road connects Section 1 saves described battery battery core cathode voltage to N-1 respectively, described in Yi Shi N-1 road, voltage subtraction device calculates and exports the voltage of Section 2 to N batteries battery core, and the voltage of first segment battery battery core equals the cathode voltage of first segment battery battery core.
Particularly, described plurality of voltages subtracter comprises LM324 chip and subtracter peripheral circuit.
Preferably, described voltage collection circuit also comprises N road follower, the input of N road follower connects the positive pole of N batteries battery core respectively, export termination N-1 road voltage subtraction device, for the cathode voltage to gather N batteries battery core, and the cathode voltage of N batteries battery core is delivered to N-1 road voltage subtraction device.Particularly, described N road follower comprises LM324 chip and follower peripheral circuit.
Preferably, described lithium battery has N batteries battery core, N be more than or equal to 2 integer, described voltage comparator circuit comprises N road voltage comparator, described in N road, the in-phase input end of voltage comparator connects the voltage of first segment to N batteries battery core, the reference voltage of the anti-phase input termination preset voltage value size of voltage comparator described in N road, described in N road, the output of voltage comparator is connected to the output of described voltage comparator circuit, to export the overvoltage detection signal of high level when the voltage of arbitrary described battery battery core is greater than preset voltage value.
Particularly, described voltage comparator circuit comprises LM339 chip and comparator peripheral circuit.
Preferably; described second protection switch comprises the first metal-oxide-semiconductor and resistance R1; the grid (G) of described first metal-oxide-semiconductor connects the output of described voltage comparator circuit; drain electrode (D) connects described fuse; source electrode (S) ground connection; described resistance R1 is connected between the grid (G) of described first metal-oxide-semiconductor and ground, and described first metal-oxide-semiconductor is according to the conducting of described overvoltage detection signal to make one end ground connection fusing of fuse, and the charge circuit of lithium battery disconnects.Particularly, filter capacitor C1 is also serially connected with between the grid (G) of described first metal-oxide-semiconductor and ground.
The invention also discloses a kind of lithium battery protection circuit, comprise li-ion cell protection IC, charge protection metal-oxide-semiconductor, discharge prevention metal-oxide-semiconductor and lithium battery secondary overvoltage protective circuit, described charge protection metal-oxide-semiconductor and discharge prevention metal-oxide-semiconductor are connected afterwards and are serially connected with the charging and discharging circuit of lithium battery, the charging control pin of described li-ion cell protection IC connects the control end of described charge protection metal-oxide-semiconductor and exceedes charge protection metal-oxide-semiconductor disconnection described in overvoltage threshold values time control system at the voltage of single battery battery core, the control of discharge pin of described li-ion cell protection IC connects the control end of described discharge prevention metal-oxide-semiconductor and disconnects lower than controlling described discharge prevention metal-oxide-semiconductor during under-voltage threshold values at the voltage of single battery battery core, described lithium battery secondary overvoltage protective circuit is described above, described preset value is greater than described overvoltage threshold values.
Compared with prior art; the utility model is provided with lithium battery secondary voltage protective circuit on the basis of original protective circuit; can ensure when li-ion cell protection IC or two power MOSFET fault; the charging of available protecting lithium battery; prevent lithium battery surcharge to such an extent as to cause danger, safe and reliable.On the other hand; because described preset value is greater than, described overvoltage threshold values therefore the utility model only start to perform after former li-ion cell protection (li-ion cell protection IC, charge protection metal-oxide-semiconductor and discharge prevention metal-oxide-semiconductor) lost efficacy; in lithium battery normal charging process; the second protection switch of lithium battery secondary voltage protective circuit remains open state; only former li-ion cell protection lost efficacy and over-charge of lithium battery time control second protection switch conduction to burn out fuse, reminding user.
Described preset voltage value is 4.3V, and overvoltage threshold values is 4.2V, and described under-voltage threshold values is 2.5V.
Accompanying drawing explanation
Fig. 1 is lithium battery protection circuit circuit diagram described in the utility model.
Fig. 2 is the partial circuit figure of voltage collection circuit described in the utility model.
Fig. 3 is the circuit diagram of follower described in the utility model.
Fig. 4 is the partial circuit figure of voltage comparator circuit described in the utility model.
Embodiment
By describing technology contents of the present utility model, structural feature in detail, realized object and effect, accompanying drawing is coordinated to be explained in detail below in conjunction with execution mode.
With reference to figure 1, the utility model discloses a kind of lithium battery protection circuit 100, comprise li-ion cell protection IC10, charge protection metal-oxide-semiconductor Q1, discharge prevention metal-oxide-semiconductor Q2 and lithium battery secondary overvoltage protective circuit, described charge protection metal-oxide-semiconductor Q1 and discharge prevention metal-oxide-semiconductor Q2 connects afterwards and is serially connected with the charging and discharging circuit of lithium battery, the charging control pin CO of described li-ion cell protection IC10 connects the control end of described charge protection metal-oxide-semiconductor Q1 and exceedes charge protection metal-oxide-semiconductor Q1 described in overvoltage threshold values time control system at the voltage of single battery battery core and disconnect, the control of discharge pin DO of described li-ion cell protection IC10 connects the control end of described discharge prevention metal-oxide-semiconductor Q2 and disconnects lower than controlling described discharge prevention metal-oxide-semiconductor Q2 during under-voltage threshold values at the voltage of single battery battery core, described lithium battery secondary overvoltage protective circuit is used for carrying out second protection to lithium battery, namely at li-ion cell protection IC10, charge protection metal-oxide-semiconductor Q1, discharge prevention metal-oxide-semiconductor Q2 fault, the single battery battery core voltage of lithium battery disconnects the charge circuit of lithium battery when exceeding overvoltage threshold values.Wherein, described lithium battery has N batteries battery core B1-BN, N be more than or equal to 2 integer.
Wherein, described li-ion cell protection IC10 not only can carry out overvoltage and under-voltage protection, can also detect the magnitude of current of discharge and recharge by resistance RX and carry out overcurrent protection.In the present embodiment, overvoltage threshold values is 4.2V, and described under-voltage threshold values is 2.5V.
Continue with reference to figure 1, described lithium battery secondary voltage protective circuit comprises voltage collection circuit 11, voltage comparator circuit 12, fuse 13 and second protection switch 14, and described voltage collection circuit 11 obtains the voltage of each battery battery core B1-BN in described lithium battery; Described voltage comparator circuit 12 compares the voltage of each battery battery core B1-BN and the preset voltage value of 4.3V, and when the magnitude of voltage of arbitrary described battery battery core B1, B2 or BN exceeds 4.3V by output output overvoltage detection signal, described preset voltage value is greater than the overvoltage threshold values of the li-ion cell protection IC of lithium battery; Described fuse 13 is serially connected with between the charging positive pole C+ of described lithium battery and the total positive pole B+ of battery battery core; Overvoltage detection signal described in the control termination of described second protection switch 14; one end of fuse 13 described in input termination; output head grounding; and close according to described overvoltage detection signal; to make one end ground connection of fuse 13, fuse 13 is directly connected between charging positive pole C+ (the total positive pole B+ of battery battery core also can) and ground, and charge circuit is shorted; fuse 13 fuses, the conducting when charge circuit of lithium battery disconnects to make described first metal-oxide-semiconductor receive overvoltage detection signal.Wherein, B-is total negative pole of battery battery core, and C-is charging negative pole, and P+ is load positive pole, and P-is load negative pole.The input that drain electrode (D) can connect fuse 13 also can connect the output of fuse 13.
Continue with reference to figure 1; in the present embodiment; described second protection switch 14 comprises the first metal-oxide-semiconductor Q3 and resistance R1; the grid (G) of described first metal-oxide-semiconductor Q3 connects the output of described voltage comparator circuit; drain electrode (D) connects one end of described fuse 13; source electrode (S) ground connection, described resistance R1 is connected between the grid (G) of described first metal-oxide-semiconductor and ground, and described first metal-oxide-semiconductor Q1 is according to the conducting of described overvoltage detection signal.Particularly, filter capacitor C1 is also serially connected with between the grid (G) of described first metal-oxide-semiconductor Q3 and ground.
It is noted that described preset voltage value, overvoltage threshold values are and the concrete numerical value of described under-voltage threshold values is in no way limited within the scope of above-mentioned 4.3V, 4.2V and 2.5V, technical staff can arrange required numerical values recited according to actual needs.With reference to figure 1 and Fig. 2, described voltage collection circuit 11 comprises N-1 road voltage subtraction device, described in N-1 road, voltage subtraction device connects the cathode voltage of N batteries battery core respectively, calculate the difference of Section 2 to the cathode voltage of cathode voltage joint last with it (Section 1 is to the N-1 joint) battery battery core of N batteries battery core to obtain the voltage of Section 2 to N batteries battery core, the voltage VB1 of first segment battery battery core B1 equals the cathode voltage SB1 of first segment battery battery core B1.
With reference to figure 2, illustrate that wherein Section 1 connects the voltage computational methods of battery battery core B1-B5 to the 5th: Fig. 2 gathers the four road voltage subtraction devices of Section 2 to the voltage of Section 5 battery battery core B2-B5, described 4 road voltage subtraction devices comprise four high guaily unit integrated circuit D1 and peripheral circuit thereof: four high guaily unit integrated circuit D1 is LM324 chip, 4 pin of four high guaily unit integrated circuit D1 meet reference voltage V CC by resistance R10, the 11 pin ground connection of four high guaily unit integrated circuit D1, resistance R41 (the first feedback resistance) is serially connected with between 1 pin (the first output) of four high guaily unit integrated circuit D1 and 2 pin (the first inverting input), 2 pin (the first inverting input) of four high guaily unit integrated circuit D1 connect the positive pole of battery battery core B2 to receive the cathode voltage SB2 of battery battery core B2 by resistance 11, 3 pin (the first in-phase input end) of four high guaily unit integrated circuit D1 connect the positive pole of battery battery core B3 to receive the cathode voltage SB3 of battery battery core B3 by resistance 21, 3 pin of four high guaily unit integrated circuit D1 are by resistance R31 ground connection, the i.e. cathode voltage SB2 of the anti-phase input termination battery battery core B2 of first via voltage subtraction device, in-phase input end meets the cathode voltage SB3 of battery battery core B3, four high guaily unit integrated circuit D1 calculates the difference of the cathode voltage SB3 of battery battery core B3 and the cathode voltage SB2 of battery battery core B2, with the voltage VB3 making 1 pin of four high guaily unit integrated circuit D1 (the first output) export battery B3.Resistance R42 (the second feedback resistance) is serially connected with between 7 pin (the second output) of four high guaily unit integrated circuit D1 and 6 pin (the second inverting input), 6 pin (the second inverting input) of four high guaily unit integrated circuit D1 connect the positive pole of battery battery core B1 to receive the cathode voltage SB1 of battery battery core B1 by resistance 12, 5 pin (the second in-phase input end) of four high guaily unit integrated circuit D1 connect the positive pole of battery battery core B2 to receive the cathode voltage SB2 of battery battery core B2 by resistance 22, 5 pin of four high guaily unit integrated circuit D1 are by resistance R32 ground connection, 7 pin (the second output) of four high guaily unit integrated circuit D1 export the voltage VB2 of battery B2.Resistance R43 (the 3rd feedback resistance) is serially connected with between 8 pin (the 3rd output) of four high guaily unit integrated circuit D1 and 9 pin (the 3rd inverting input), 9 pin (the 3rd inverting input) of four high guaily unit integrated circuit D1 connect the positive pole of battery battery core B4 to receive the cathode voltage SB4 of battery battery core B4 by resistance 13, 10 pin (the 3rd in-phase input end) of four high guaily unit integrated circuit D1 connect the positive pole of battery battery core B5 to receive the cathode voltage SB5 of battery battery core B5 by resistance 23, 10 pin of four high guaily unit integrated circuit D1 are by resistance R33 ground connection, 8 pin (the 3rd output) of four high guaily unit integrated circuit D1 export the voltage VB5 of battery B5.Resistance R44 (the 4th feedback resistance) is serially connected with between 14 pin (the 4th output) of four high guaily unit integrated circuit D1 and 13 pin (the 4th inverting input), 13 pin (the 4th inverting input) of four high guaily unit integrated circuit D1 connect the positive pole of battery battery core B3 to receive the cathode voltage SB3 of battery battery core B3 by resistance 14, 12 pin (the 4th in-phase input end) of four high guaily unit integrated circuit D1 connect the positive pole of battery battery core B4 to receive the cathode voltage SB4 of battery battery core B4 by resistance 24, 12 pin of four high guaily unit integrated circuit D1 are by resistance R34 ground connection, 14 pin (the 4th output) of four high guaily unit integrated circuit D1 export the voltage VB4 of battery B4.The voltage VB4 of first segment battery battery core B1 equals the cathode voltage SB4 of first segment battery battery core B1.
Preferably, is also serially connected with filter capacitor C41 between 1 pin of described four high guaily unit integrated circuit D1 and 2 pin, is also serially connected with filter capacitor C10 between 4 pin and ground, is also serially connected with filter capacitor C42 between 6 pin and 7 pin, is also serially connected with filter capacitor C43 between 8 pin and 9 pin, is also serially connected with filter capacitor C44 between 13 pin and 14 pin.
Preferably, described voltage collection circuit 11 also comprises N road follower, the input of N road follower connects the positive pole of N batteries battery core respectively, export termination N-1 road voltage subtraction device, for the cathode voltage SB1-SBN to gather N batteries battery core, and the cathode voltage SB1-SBN of N batteries battery core is delivered to N-1 road voltage subtraction device.With reference to figure 3, for Section 1 is to No. four followers 15 corresponding to Section 4 battery battery core, gather the voltage of battery battery core B1-B4 end respectively to obtain voltage SB1-SB4.No. four followers 15 comprise four high guaily unit integrated circuit D3 and peripheral circuit thereof, and the model of four high guaily unit integrated circuit D3 is LM324.
With reference to figure 1 and 3, described voltage comparator circuit 12 comprises N road voltage comparator, whether the voltage that voltage comparator described in N road compares N batteries battery core B1-BN respectively exceeds preset voltage value, if then export the overvoltage detection signal of high level, the overvoltage detection signal conducting of described first metal-oxide-semiconductor Q3 foundation high level is to make fuse 13 circuit fusing, and the charge circuit of lithium battery disconnects.In the present embodiment, described first metal-oxide-semiconductor is N-channel MOS pipe.
With reference to figure 4, illustrate that wherein Section 1 connects the voltage compare method of battery battery core B1-B4 to the 4th: be 4 road comparators in Fig. 4, comprise four road voltage comparator D2 and peripheral circuits thereof, four road voltage comparator D2 are chip LM339, 3 pin of four road voltage comparator D2 meet VCC by R51, 12 pin ground connection, inverting input (4 pin of four road voltage comparator circuits, 6 pin, 8 pin and 10 pin) respectively by resistance R52, R53, R54 and R55 connects the reference voltage of 4.3V (preset voltage value), in-phase input end (5 pin of four road voltage comparator circuits, 7 pin, 9 pin and 11 pin) respectively by resistance R61, R62, R63 and R64 meets the voltage VB1 of first segment battery battery core, the voltage VB2 of second section battery battery core, 1 pin (the second output) of the voltage VB3 of the 3rd batteries battery core and the voltage VB4 of the 4th batteries battery core, four road voltage comparator D2, 2 pin (the first output), 13 pin (the 4th output), 14 pin (the 3rd output) connect A point respectively, export the comparative result of the reference voltage of VB1-VB4 and 4.3V respectively, at arbitrary voltage VB1, VB2, when VB3 or VB4 is greater than 4.3V (preset voltage value), A point exports the overvoltage detection signal of high level.
Preferably, is also serially connected with filter capacitor C61 between 5 pin of described four road voltage comparator D2 and ground, is also serially connected with filter capacitor C62 between 7 pin and ground, is also serially connected with filter capacitor C63 between 9 pin and ground, is also serially connected with filter capacitor C64 between 11 pin and ground.
Wherein, N-1 road voltage subtraction device and N road voltage comparator also can be the subtracter and voltage comparator that are made up of other chips and peripheral circuit, are not limited in above-mentioned scope.
With reference to figure 1; the course of work of the present utility model is described; when lithium cell charging, li-ion cell protection IC works, and detects the voltage and current of every batteries battery core in real time; and after lithium battery is full of electricity; li-ion cell protection IC detects that the voltage of battery battery core arrives the charging control pin CO output low level of 4.2V, li-ion cell protection IC, the drain electrode (D) of charge protection metal-oxide-semiconductor Q1 and source electrode (S) open circuit; lithium cell charging loop disconnects, and lithium battery is filled electricity.If the charge protection metal-oxide-semiconductor Q1 of lithium battery is burnt open circuit or li-ion cell protection IC fault makes charging control pin CO export high level always; when lithium battery is full of electricity; charge circuit still works; now the voltage of battery battery core exceeds 4.2V; when the voltage of battery battery core is greater than 4.3V; voltage comparator circuit 12 exports the overvoltage detection signal of high level by A point; the drain electrode (D) of the first metal-oxide-semiconductor and source electrode (S) short circuit; fuse 13 is serially connected with between charging end positive pole C+ and ground; fuse 13 fusing is burnt, and charge circuit disconnects.
Preferably, in order to timely reminding user, also has warning circuit in described lithium battery secondary voltage protective circuit, and described warning circuit can be connected to buzzer between A point and ground and/or light-emitting diode, is used for lithium battery overvoltage protection damages for reminding.
Wherein, total positive pole B+ of voltage reference circuit 20 one end lithium battery, for providing corresponding reference voltage for lithium battery secondary voltage protective circuit, thus powers to lithium battery secondary voltage protective circuit.
Above disclosedly be only preferred embodiment of the present utility model, certainly can not limit the interest field of the utility model with this, therefore according to the equivalent variations that the utility model claim is done, still belong to the scope that the utility model is contained.
Claims (10)
1. a lithium battery secondary overvoltage protective circuit, for carrying out secondary overvoltage protection to lithium battery, described lithium battery has multiple batteries battery core, it is characterized in that, comprising:
Voltage collection circuit, obtains the voltage of each battery battery core in described lithium battery;
Voltage comparator circuit, compare voltage and the preset voltage value of each battery battery core, and when the magnitude of voltage of arbitrary described battery battery core exceeds preset voltage value by output output overvoltage detection signal, described preset voltage value is greater than the overvoltage threshold values of the li-ion cell protection IC of lithium battery;
Fuse, between the total positive pole of charging Anode and battery battery core being serially connected with described lithium battery;
Second protection switch, overvoltage detection signal described in the control termination of described second protection switch, one end of fuse described in input termination, output head grounding, and close according to described overvoltage detection signal.
2. lithium battery secondary overvoltage protective circuit as claimed in claim 1, it is characterized in that, described lithium battery has N batteries battery core, N be more than or equal to 2 integer, described voltage collection circuit comprises N-1 road voltage subtraction device, and the inverting input of voltage subtraction device described in N-1 road connects Section 2 saves described battery battery core cathode voltage to N respectively, the in-phase input end of voltage subtraction device described in N-1 road connects Section 1 saves described battery battery core cathode voltage to N-1 respectively, voltage subtraction device described in Yi Shi N-1 road calculates and exports the voltage of Section 2 to N batteries battery core respectively, and the voltage of first segment battery battery core equals the cathode voltage of first segment battery battery core.
3. lithium battery secondary overvoltage protective circuit as claimed in claim 2, it is characterized in that, described N-1 road voltage subtraction device comprises LM324 chip and subtracter peripheral circuit.
4. lithium battery secondary overvoltage protective circuit as claimed in claim 2; it is characterized in that; described voltage collection circuit also comprises N road follower; the input of N road follower connects the positive pole of N batteries battery core respectively; export termination N-1 road voltage subtraction device; for the cathode voltage to gather N batteries battery core, and the cathode voltage of N batteries battery core is delivered to N-1 road voltage subtraction device.
5. lithium battery secondary overvoltage protective circuit as claimed in claim 1, it is characterized in that, described lithium battery has N batteries battery core, N be more than or equal to 2 integer, described voltage comparator circuit comprises N road voltage comparator, described in N road, the in-phase input end of voltage comparator connects the voltage of first segment to N batteries battery core, the reference voltage of the anti-phase input termination preset voltage value size of voltage comparator described in N road, described in N road, the output of voltage comparator is connected to the output of described voltage comparator circuit, to export the overvoltage detection signal of high level when the voltage of arbitrary described battery battery core is greater than preset voltage value.
6. lithium battery secondary overvoltage protective circuit as claimed in claim 5, it is characterized in that, described voltage comparator circuit comprises LM339 chip and comparator peripheral circuit.
7. lithium battery secondary overvoltage protective circuit as claimed in claim 1; it is characterized in that; described second protection switch comprises the first metal-oxide-semiconductor and resistance R1; the grid (G) of described first metal-oxide-semiconductor connects the output of described voltage comparator circuit; drain electrode (D) connects described fuse; source electrode (S) ground connection, described resistance R1 is connected between the grid (G) of described first metal-oxide-semiconductor and ground, and described first metal-oxide-semiconductor is according to the conducting of described overvoltage detection signal.
8. lithium battery secondary overvoltage protective circuit as claimed in claim 7, is characterized in that, be also serially connected with filter capacitor C1 between the grid (G) of described first metal-oxide-semiconductor and ground.
9. a lithium battery protection circuit, comprise li-ion cell protection IC, charge protection metal-oxide-semiconductor and discharge prevention metal-oxide-semiconductor, described charge protection metal-oxide-semiconductor and discharge prevention metal-oxide-semiconductor are connected afterwards and are serially connected with the charging and discharging circuit of lithium battery, the charging control pin of described li-ion cell protection IC connects the control end of described charge protection metal-oxide-semiconductor and exceedes charge protection metal-oxide-semiconductor disconnection described in overvoltage threshold values time control system at the voltage of single battery battery core, the control of discharge pin of described li-ion cell protection IC connects the control end of described discharge prevention metal-oxide-semiconductor and disconnects lower than controlling described discharge prevention metal-oxide-semiconductor during under-voltage threshold values at the voltage of single battery battery core, it is characterized in that, also comprise lithium battery secondary overvoltage protective circuit, described lithium battery secondary overvoltage protective circuit is according to any one of claim 1-8, described preset value is greater than described overvoltage threshold values.
10. lithium battery protection circuit as claimed in claim 9, it is characterized in that, described preset voltage value is 4.3V, and overvoltage threshold values is 4.2V, and described under-voltage threshold values is 2.5V.
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| CN201420796734.0U CN204407869U (en) | 2014-12-15 | 2014-12-15 | Lithium battery secondary overvoltage protective circuit and lithium battery protection circuit |
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| CN201420796734.0U CN204407869U (en) | 2014-12-15 | 2014-12-15 | Lithium battery secondary overvoltage protective circuit and lithium battery protection circuit |
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| CN112165076A (en) * | 2020-10-22 | 2021-01-01 | 加森电子科技技术(江苏盐城)有限公司 | Lithium battery secondary overvoltage overcharge-prevention protection system and control method |
| CN112688279A (en) * | 2020-12-22 | 2021-04-20 | 惠州市蓝微电子有限公司 | Lithium ion battery protection circuit |
| CN112838647A (en) * | 2021-02-26 | 2021-05-25 | 江西迪比科股份有限公司 | Lithium ion battery circuit with multiple protection functions |
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| CN113049970A (en) * | 2021-03-19 | 2021-06-29 | 东莞新能德科技有限公司 | Battery protection plate, battery and detection method |
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