CN210792872U - Lithium battery protection circuit is kept apart in charge-discharge - Google Patents
Lithium battery protection circuit is kept apart in charge-discharge Download PDFInfo
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- CN210792872U CN210792872U CN201921556223.0U CN201921556223U CN210792872U CN 210792872 U CN210792872 U CN 210792872U CN 201921556223 U CN201921556223 U CN 201921556223U CN 210792872 U CN210792872 U CN 210792872U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The utility model discloses a charging and discharging isolation lithium battery protection circuit, which comprises an overcharge and overdischarge detection circuit, a charge switch circuit and a discharge switch circuit, wherein the overcharge and overdischarge detection circuit is connected with a lithium battery so as to detect overcharge and overdischarge of the lithium battery; the charging switch circuit is connected with the overcharge and overdischarge detection circuit and the charging input and output end so as to perform charging control under the control of the overcharge and overdischarge detection circuit; the discharge switch circuit is connected with the overcharge and overdischarge detection circuit and the discharge input and output end so as to perform discharge control under the control of the overcharge and overdischarge detection circuit. The overcharge and overdischarge detection and the overcharge and overdischarge protection of the lithium battery are realized, and the charging loop are isolated from each other. When the external equipment charges the lithium battery, the lithium battery cannot supply power to the discharging loop. The electric vehicle is prevented from being started during charging, and charging termination and even accidents are avoided.
Description
Technical Field
The utility model relates to a lithium battery protection technical field especially relates to a lithium battery protection circuit is kept apart in charge and discharge.
Background
In recent years, secondary batteries such as lithium (Li) ion batteries have been widely used. The lithium (Li) ion battery may be overcharged or overdischarged during use, etc. The battery may have an overcurrent phenomenon caused by a short circuit of an external load during use, and the overcurrent phenomenon may cause overheating of a discharge circuit. And even burn out the circuit board. In addition, because the charging loop and the discharging loop of the lithium battery of the electric vehicle are in the same loop, the external equipment supplies power to the discharging loop while charging the lithium battery. At this time, the electric vehicle may start to run, resulting in the termination of charging and even accidents.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, an object of the utility model is to provide a lithium battery protection circuit is kept apart in charge and discharge.
In order to achieve the above object, according to the utility model discloses lithium battery protection circuit is kept apart in charge and discharge, lithium battery protection circuit is kept apart in charge and discharge includes:
the overcharge and overdischarge detection circuit is connected with the lithium battery to detect overcharge and overdischarge of the lithium battery;
the charging switch circuit is connected with the overcharge and overdischarge detection circuit and the charging input and output end so as to perform charging control under the control of the overcharge and overdischarge detection circuit;
and the discharge switch circuit is connected with the overcharge and overdischarge detection circuit and the discharge input and output end so as to perform discharge control under the control of the overcharge and overdischarge detection circuit.
Further, according to the utility model discloses an embodiment, charge-discharge isolation lithium battery protection circuit still includes the control circuit that discharges, overcharge overdischarge detection circuitry passes through the control circuit that discharges with discharge switch circuit connects, overcharge overdischarge detection circuitry passes through discharge control circuitry is right discharge switch circuit carries out discharge control.
Further, according to an embodiment of the present invention, the discharge control circuit includes a MOS transistor Q6, a first resistor R44, a second resistor R48, a first transistor Q8, a third resistor R53, and a fourth resistor R60; the overcharge and overdischarge detection circuit comprises a first overcharge and overdischarge detection chip U2 and a second overcharge and overdischarge detection chip U4, wherein one end of a third resistor R53 is connected to an overdischarge output terminal of the first overcharge and overdischarge detection chip U2, the other end of the third resistor R53 is connected to one end of a fourth resistor R60, the other end of the fourth resistor R60 is connected to a reference ground, the one end of the fourth resistor R60 is connected to a base of the first transistor Q8, an emitter of the first transistor Q8 is connected to the reference ground, a collector of the first transistor Q8 is connected to one end of the second resistor R48, the other end of the second resistor R48 is connected to one end of the first resistor R44 and a gate of the MOS transistor Q6, and the other end of the first resistor R44 is connected to a source of the MOS transistor Q6 and the overdischarge detection chip output terminal of the second overcharge and overdischarge detection chip U4, the drain of the MOS transistor Q6 is connected to the discharge switch circuit.
Further, according to an embodiment of the present invention, the discharge control circuit further includes a second transistor Q9, a fifth resistor R54 and a sixth resistor R61, a seventh resistor R51 and a third transistor Q10, one end of the fifth resistor R54 is connected to the overdischarge output terminal of the first overcharge and overdischarge detection chip U2, the other end of the fifth resistor R54 is connected to one end of the sixth resistor R61, the other end of the sixth resistor R61 is connected to a reference ground, the one end of the sixth resistor R61 is connected to the base of the second transistor Q9, the emitter of the second transistor Q9 is connected to the reference ground, the collector of the second transistor Q9 is connected to one end of the seventh resistor R51, the other end of the seventh resistor R51 is connected to a positive terminal (BAT +), the collector of the second transistor Q9 is further connected to the base of the third transistor Q10, an emitter of the third transistor Q10 is connected to ground, and a collector of the third transistor Q10 is connected to the discharge switch circuit.
Further, according to the utility model discloses an embodiment, charge and discharge isolation lithium battery protection circuit still includes the detection circuitry that charges, the detection circuitry that charges respectively with lithium cell and discharge control circuit connect, in order to detect when being in the electrical status of battery, through discharge control circuit control discharge switch circuit stops discharging.
Further, according to the utility model discloses an embodiment, the detection circuitry that charges includes: a fourth transistor Q19, an eighth resistor R70, a ninth resistor R72, a tenth resistor R76, an eleventh resistor R74 and a fifth transistor Q21, wherein an emitter of the fourth transistor Q19 is connected to the positive charging terminal CH + of the lithium battery and one end of an eighth resistor R70, the other end of the eighth resistor R70 is connected to a base of the fourth transistor Q19, a base of the fourth transistor Q19 is further connected to one end of the ninth resistor R72, the other end of the ninth resistor R72 is connected to the positive charging terminal CH-of the lithium battery, a collector of the fourth transistor Q19 is connected to one end of the tenth resistor R76, the other end of the tenth resistor R76 is connected to a reference ground, the one end of the tenth resistor R76 is further connected to one end of the eleventh resistor R74, and the other end of the eleventh resistor R74 is connected to a base of the fifth transistor Q21, an emitter of the fifth transistor Q21 is connected to a ground reference, and a collector of the fifth transistor Q21 is connected to the one end of the third resistor R53 of the discharge control circuit.
Further, according to the utility model discloses an embodiment, charge and discharge isolation lithium battery protection circuit still includes the detection circuitry that overcharges, overcharge detection circuitry respectively with lithium cell and charging switch are connected, and is right the lithium cell overcharge detects, and passes through charging switch circuit carries out charge control.
Further, according to the utility model discloses an embodiment, charge-discharge isolation lithium battery protection circuit still includes overflows detection circuitry, overflow detection circuitry respectively with discharge switch circuit and overcharge overdischarge detection circuitry connect, with right the discharge circuit of lithium cell overflows the detection, and passes through overcharge overdischarge detection circuitry control discharge switch circuit carries out overcurrent protection.
Further, according to the utility model discloses an embodiment, the detection circuitry overflows includes twelfth resistance RS1, thirteenth resistance R62 and electric capacity C29, the one end of twelfth resistance RS1 is connected with the ground of reference, the other end of twelfth resistance RS1 with discharge switch circuit connection, the one end of thirteenth resistance R62 with the other end of twelfth resistance RS1 is connected, the other end of thirteenth resistance R62 with the one end of electric capacity C29 is connected, the other end of electric capacity C29 with reference ground connection, the other end of thirteenth resistance R62 with the electric current detection end that the detection circuitry was put to overcharge and overdischarge is connected.
The embodiment of the utility model provides a charge-discharge isolation lithium battery protection circuit detects the overcharge and overdischarge of the lithium battery through the overcharge and overdischarge detection circuit; the charging switch circuit performs charging control under the control of the overcharge and overdischarge detection circuit; the discharge switch circuit performs discharge control under the control of the overcharge and overdischarge detection circuit. The overcharge and overdischarge detection and the overcharge and overdischarge protection of the lithium battery are realized, and the charging loop are isolated from each other. When the external equipment charges the lithium battery, the lithium battery cannot supply power to the discharging loop. The electric vehicle is prevented from being started during charging, and charging termination and even accidents are avoided.
Drawings
Fig. 1 is a block diagram of a charging and discharging isolation lithium battery protection circuit implemented by the present invention;
fig. 2 is a protection circuit diagram of a lithium battery for charge and discharge isolation provided by the utility model.
Reference numerals:
an overcharge-overdischarge detection circuit 10;
an overcharge detection circuit 20;
a discharge control circuit 30;
a charge switch circuit 40;
a charge detection circuit 50;
a discharge switch circuit 60;
an overcurrent detection circuit 70;
a lithium battery 80;
a charging plus terminal 90;
a discharge plus terminal 11;
a charging negative terminal 12;
discharging the negative terminal 13.
The purpose of the present invention is to provide a novel and improved method and apparatus for operating a computer.
Detailed Description
In order to make the technical field person understand the scheme of the present invention better, the following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical scheme in the embodiments of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Referring to fig. 1 and 2, an embodiment of the present invention provides a protection circuit for a charging and discharging isolation lithium battery 80, including: the device comprises an overcharge and overdischarge detection circuit 10, a charge switch circuit 40 and a discharge switch circuit 60, wherein the overcharge and overdischarge detection circuit 10 is connected with a lithium battery 80 so as to detect overcharge and overdischarge of the lithium battery 80; as shown in fig. 1, the overcharge and overdischarge detection circuit 10 is connected to a lithium battery 80 to perform overcharge and overdischarge detection of the lithium battery 80. In the embodiment of the present invention, the lithium battery 80 includes a plurality of lithium batteries 80 to provide sufficient electric power, and the overcharge and overdischarge detection circuit 10 is connected to each lithium battery 80 respectively to perform overcharge and overdischarge detection on each lithium battery 80.
Referring to fig. 2, the overcharge and overdischarge detection circuit 10 includes: the battery detection end of the first overcharge and overdischarge detection chip U2 is connected with the multiple lithium batteries 80, and the battery detection end of the second overcharge and overdischarge detection chip U3 is connected with the multiple lithium batteries 80. As shown in fig. 2, since the lithium batteries 80 are multiple in number, in the embodiment of the present invention, the lithium batteries 80 can be set to 10, the first overcharge and overdischarge detection chip U2 detects overcharge and overdischarge of 5 lithium batteries 80, respectively, and the second overcharge and overdischarge detection chip U4 detects overcharge and overdischarge of the other 5 lithium batteries 80, respectively. That is, the first overcharge and overdischarge detection chip U2 and the second overcharge and overdischarge detection chip U4 can be used for detecting overcharge and overdischarge of 10 lithium batteries 80.
The charging switch circuit 40 is connected with the overcharge and overdischarge detection circuit 10 and the charging input and output end so as to perform charging control under the control of the overcharge and overdischarge detection circuit 10; as shown in fig. 1 and 2, the controlled terminal of the charge switch circuit 40 is connected to the overcharge detection output terminal of the overcharge and overdischarge detection circuit 10 to switch-control the charge circuit of the lithium battery 80 under the control of the overcharge and overdischarge detection circuit 10. That is, when the overcharge/overdischarge detection circuit 10 detects that the lithium battery 80 is overcharged, it outputs an overcharge detection signal to the overcharge switch circuit, and the overcharge switch circuit controls the charging circuit to be turned off. And one end of the charging switch circuit 40 is connected to one end of the charging input/output terminal (e.g., the charging negative terminal 12 in the figure), and the other end of the charging switch circuit 40 is connected to the other end of the charging input/output terminal (e.g., the charging positive terminal 90 in the figure) through the lithium battery 80. So as to charge the lithium battery 80 through the charging plus terminal 90 and the charging minus terminal 12.
The discharge switch circuit 60 is connected to the overcharge and overdischarge detection circuit 10 and the discharge input/output terminal to perform discharge control under the control of the overcharge and overdischarge detection circuit 10. As shown in fig. 1 and 2, the controlled terminal of the discharge switching circuit 60 is connected to the over-discharge detection output terminal of the over-charge and over-discharge detection circuit 10 to perform switching control of the discharge circuit of the lithium battery 80 under the control of the over-charge and over-discharge detection circuit 10. That is, when the overcharge and overdischarge detection circuit 10 detects that the lithium battery 80 is overdischarged, it outputs an overdischarge detection signal to the overdischarge switch circuit, and the discharge circuit is controlled to be closed by the overdischarge switch circuit. And one end of the discharge switch circuit 60 is connected to one of the discharge input and output terminals (as shown by the discharge negative terminal 13), and the other end of the discharge switch circuit 60 is connected to the other end of the discharge input and output terminal (as shown by the discharge positive terminal 11) via the lithium battery 80. To discharge the lithium battery 80 through the discharging plus terminal 11 and the discharging minus terminal 13.
In the embodiment of the utility model, the overcharge and overdischarge detection circuit 10 is used for detecting the overcharge and overdischarge of the lithium battery 80; the charging switch circuit 40 performs charging control under the control of the overcharge and overdischarge detection circuit 10; the discharge switch circuit 60 performs discharge control under the control of the overcharge and overdischarge detection circuit 10. Overcharge and overdischarge detection and overcharge and overdischarge protection of the lithium battery 80 are achieved due to the mutual isolation of the charging loop and the charging loop. When the external equipment charges the lithium battery, the lithium battery cannot supply power to the discharging loop. The electric vehicle is prevented from being started during charging, and charging termination and even accidents are avoided.
Referring to fig. 1 and 2, the protection circuit for the charge and discharge isolation lithium battery 80 further includes a discharge control circuit 30, the overcharge and overdischarge detection circuit 10 is connected to the discharge switch circuit 60 through the discharge control circuit 30, and the overcharge and overdischarge detection circuit 10 controls the discharge switch circuit 60 through the discharge control circuit 30. As shown in fig. 1, the overcharge and overdischarge detection circuit 10 is shown connected to the discharge switch circuit 60 through the discharge control circuit 30 to switch-control the discharge circuit through the discharge control circuit 30. The over-discharge detection signal output by the over-charge and over-discharge detection circuit is processed and output by the discharge control circuit 30, so that the over-charge and over-discharge detection circuit signal is prevented from being output to the discharge switch circuit 60. To enable further control of the discharge switch circuit 60.
Referring to fig. 2, the discharge control circuit 30 includes a MOS transistor Q6, a first resistor R44, a second resistor R48, a first transistor Q8, a third resistor R53, and a fourth resistor R60; the overcharge and overdischarge detection circuit 10 comprises a first overcharge and overdischarge detection chip U2 and a second overcharge and overdischarge detection chip U4, one end of a third resistor R53 is connected with an overdischarge output end of the first overcharge and overdischarge detection chip U2, the other end of the third resistor R53 is connected with one end of a fourth resistor R60, the other end of the fourth resistor R60 is connected with a reference ground, one end of the fourth resistor R60 is connected with a base of a first triode Q8, an emitter of a first triode Q8 is connected with the reference ground, a collector of the first triode Q8 is connected with one end of a second resistor R48, the other end of the second resistor R48 is connected with one end of a first resistor R44 and a gate of a MOS transistor Q6, the other end of the first resistor R44 is connected with a source of a MOS transistor Q6 and the overdischarge output end of the second overcharge and overdischarge detection chip U4, and a drain of the MOS transistor Q6 is connected with a discharge switch circuit 60. As shown in fig. 2, when the over-discharge detection circuit detects that the lithium battery 80 is over-discharged, the first transistor Q8 is turned off by outputting a low level to one end of the third resistor R53 through the over-charge detection signal output terminal DO1, and at this time, the gate signal of the MOS transistor Q6 is at a high level, the MOS transistor Q6 is turned off, the controlled terminal of the discharge switch circuit 60 is at a non-high level state, and the discharge loop is turned off. The embodiment of the utility model provides an in, constitute discharge control circuit 30 through MOS transistor Q6, first resistance R44, second resistance R48, first triode Q8, third resistance R53 and fourth resistance R60, the circuit is simple, and the cost is lower.
Referring to fig. 2, the discharge control circuit 30 further includes a second transistor Q9, a fifth resistor R54, and a sixth resistor R61, a seventh resistor R51 and a third transistor Q10, one end of a fifth resistor R54 is connected to the over-discharge output terminal of the first over-charge and over-discharge detection chip U2, the other end of the fifth resistor R54 is connected to one end of a sixth resistor R61, the other end of the sixth resistor R61 is connected to the reference ground, one end of a sixth resistor R61 is connected to the base of the second transistor Q9, the emitter of the second transistor Q9 is connected to the reference ground, the collector of the second transistor Q9 is connected to one end of a seventh resistor R51, the other end of the seventh resistor R51 is connected to the positive power supply terminal (BAT +) of the lithium battery 80, the collector of the second transistor Q9 is further connected to the base of the third transistor Q10, the emitter of the third transistor Q10 is connected to the reference ground, and the collector of the third transistor Q10 is connected to the discharge switch circuit 60. As shown in fig. 2, when the base of the second transistor Q9 is at a low level, the second transistor Q9 is in an off state. At this time, the third transistor Q10 is turned on at the output high level of the positive power supply terminal (BAT +) of the lithium battery 80, so that the collector of the third transistor Q10 is at a low level, thereby pulling the controlled terminal of the discharge switch circuit 60 low and closing the discharge loop.
Referring to fig. 1, the protection circuit for the lithium battery 80 further includes a charging detection circuit 50, and the charging detection circuit 50 is respectively connected to the lithium battery 80 and the discharging control circuit 30 to detect that the battery is in an electrical state, and control the discharging switch circuit 60 to stop discharging through the discharging control circuit 30. Referring to fig. 1, whether the lithium battery 80 is in a charging state can be detected by the charging detection circuit 50, and when the lithium battery 80 is detected to be in the charging state, the charging detection signal is output to the controlled end of the discharging switch circuit 60, so that the discharging circuit of the lithium battery 80 is closed by the discharging switch circuit 60, and the electric vehicle is prevented from running due to continuous discharging during charging, and charging failure is prevented.
Referring to fig. 2, the charge detection circuit 50 includes: a fourth triode Q19, an eighth resistor R70, a ninth resistor R72, a tenth resistor R76, an eleventh resistor R74, and a fifth transistor Q21, wherein an emitter of the fourth transistor Q19 is connected to the positive charging terminal CH + of the lithium battery 80 and one end of the eighth resistor R70, the other end of the eighth resistor R70 is connected to a base of the fourth transistor Q19, a base of the fourth transistor Q19 is further connected to one end of the ninth resistor R72, the other end of the ninth resistor R72 is connected to the positive charging terminal CH-of the lithium battery 80, a collector of the fourth transistor Q19 is connected to one end of the tenth resistor R76, the other end of the tenth resistor R76 is connected to the reference ground, one end of the tenth resistor R76 is further connected to one end of the eleventh resistor R74, the other end of the eleventh resistor R74 is connected to a base of the fifth transistor Q21, an emitter of the fifth transistor Q21 is connected to the reference ground, and a collector of the fifth transistor Q21 is connected to one end of the third resistor R53 of the discharge control circuit 30. As shown in fig. 2, when the lithium battery 80 is in a charging state, the fourth transistor Q19 is in a conducting state under the action of a charging voltage, and outputs a high level through the collector of the fourth transistor Q19, the high level is output to the fifth transistor Q21, the fifth transistor Q21 is turned on, the collector of the fifth transistor Q21 outputs a low level signal through the DO1 signal terminal, the electric level signal is output to the discharge control circuit 30, and the discharge control circuit 30 and the discharge switch close the discharge fall-back to avoid continuing discharging during charging.
Referring to fig. 1 and 2, the protection circuit for the lithium battery 80 for charge and discharge isolation further includes an overcharge detection circuit 20, and the overcharge detection circuit 20 is connected to the lithium battery 80 and the charge switch respectively, so as to detect overcharge of the lithium battery 80 and perform charge control through the charge switch circuit 40. Referring to fig. 2, the overcharge detection circuit 20 includes: the battery detection end of the first overcharge detection chip U1 is connected with the multiple lithium batteries 80, the battery detection end of the second overcharge detection chip U3 is connected with the multiple lithium batteries 80, and the overcharge output ends of the first overcharge detection chip U1 and the second overcharge detection chip U3 are connected with the charging switch circuit 40. Together with the overcharge and overdischarge detection circuits 10, the double overcharge detection circuits 20 are formed, so that the detection is more reliable, and when one overcharge detection circuit 20 fails, the other overcharge detection circuit 20 can still work normally, and the charging safety of the lithium battery 80 is ensured.
Referring to fig. 1, the protection circuit for the charge and discharge isolation lithium battery 80 further includes an overcurrent detection circuit 70, and the overcurrent detection circuit 70 is respectively connected to the discharge switch circuit 60 and the overcharge and overdischarge detection circuit 10 to perform overcurrent detection on the discharge circuit of the lithium battery 80 and control the discharge switch circuit 60 to perform overcurrent protection through the overcharge and overdischarge detection circuit 10. As shown in fig. 2, the over-current detection circuit 70 includes a twelfth resistor RS1, a thirteenth resistor R62 and a capacitor C29, one end of the twelfth resistor RS1 is connected to the reference ground, the other end of the twelfth resistor RS1 is connected to the discharge switch circuit 60, one end of the thirteenth resistor R62 is connected to the other end of the twelfth resistor RS1, the other end of the thirteenth resistor R62 is connected to one end of the capacitor C29, the other end of the capacitor C29 is connected to the reference ground, and the other end of the thirteenth resistor R62 is connected to the current detection end of the over-charge and over-discharge detection circuit 10. The embodiment of the utility model provides an in, detect the electric current on the return circuit that discharges through twelfth resistance RS1 to signal on the return circuit that will discharge exports to the electric current detection end of excessively charging detection circuitry 10 after through thirteenth resistance R62 and electric capacity C29 steady voltage, in order to carry out overcurrent protection through excessively charging detection circuitry 10.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing detailed description, or equivalent replacements may be made for some of the technical features of the embodiments. All utilize the equivalent structure that the content of the utility model discloses a specification and attached drawing was done, direct or indirect application is in other relevant technical field, all is in the same way the utility model discloses within the patent protection scope.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention.
Claims (9)
1. A charge-discharge isolation lithium battery protection circuit is characterized by comprising:
the overcharge and overdischarge detection circuit is connected with the lithium battery to detect overcharge and overdischarge of the lithium battery;
the charging switch circuit is connected with the overcharge and overdischarge detection circuit and the charging input and output end so as to perform charging control under the control of the overcharge and overdischarge detection circuit;
and the discharge switch circuit is connected with the overcharge and overdischarge detection circuit and the discharge input and output end so as to perform discharge control under the control of the overcharge and overdischarge detection circuit.
2. The protection circuit for the lithium battery with charge and discharge isolation as claimed in claim 1, further comprising a discharge control circuit, wherein the overcharge and overdischarge detection circuit is connected with the discharge switch circuit through the discharge control circuit, and the overcharge and overdischarge detection circuit controls discharge of the discharge switch circuit through the discharge control circuit.
3. The protection circuit for the lithium battery with charge and discharge isolation as claimed in claim 2, wherein the discharge control circuit comprises a MOS transistor (Q6), a first resistor (R44), a second resistor (R48), a first triode (Q8), a third resistor (R53) and a fourth resistor (R60); the over-charge and over-discharge detection circuit comprises a first over-charge and over-discharge detection chip (U2) and a second over-charge and over-discharge detection chip (U4), one end of a third resistor (R53) is connected with an over-discharge output end of the first over-charge and over-discharge detection chip (U2), the other end of the third resistor (R53) is connected with one end of a fourth resistor (R60), the other end of the fourth resistor (R60) is connected with a reference ground, one end of the fourth resistor (R60) is connected with a base of the first transistor (Q8), an emitter of the first transistor (Q8) is connected with the reference ground, a collector of the first transistor (Q8) is connected with one end of a second resistor (R48), the other end of the second resistor (R48) is connected with one end of the first resistor (R44) and a gate of the MOS transistor (Q6), and the other end of the first resistor (R44) is connected with a source of the second over-charge and the MOS transistor (Q6) (U4) and the drain of the MOS transistor (Q6) is connected to the discharge switch circuit.
4. The protection circuit for the lithium battery with charge and discharge isolation as claimed in claim 3, wherein the discharge control circuit further comprises a second transistor (Q9), a fifth resistor (R54), a sixth resistor (R61), a seventh resistor (R51) and a third transistor (Q10), one end of the fifth resistor (R54) is connected to the overdischarge output terminal of the first overcharge and overdischarge detection chip (U2), the other end of the fifth resistor (R54) is connected to one end of the sixth resistor (R61), the other end of the sixth resistor (R61) is connected to a reference ground, the one end of the sixth resistor (R61) is connected to the base of the second transistor (Q9), the emitter of the second transistor (Q9) is connected to the reference ground, the collector of the second transistor (Q9) is connected to one end of the seventh resistor (R51), and the other end of the seventh resistor (R51) is connected to the positive terminal of the lithium battery, the collector of the second triode (Q9) is also connected with the base of the third triode (Q10), the emitter of the third triode (Q10) is connected with the reference ground, and the collector of the third triode (Q10) is connected with the discharge switch circuit.
5. The protection circuit for lithium battery with isolation between charging and discharging as claimed in claim 4, further comprising a charging detection circuit, wherein the charging detection circuit is connected to the lithium battery and the discharging control circuit respectively, so as to detect that the discharging switch circuit stops discharging when the battery is in an electrical state.
6. The protection circuit for a lithium battery with charge and discharge isolation according to claim 5, wherein the charge detection circuit comprises: a fourth transistor (Q19), an eighth resistor (R70), a ninth resistor (R72), a tenth resistor (R76), an eleventh resistor (R74) and a fifth transistor (Q21), wherein an emitter of the fourth transistor (Q19) is connected to a positive charging terminal of the lithium battery and one end of the eighth resistor (R70), the other end of the eighth resistor (R70) is connected to a base of the fourth transistor (Q19), a base of the fourth transistor (Q19) is further connected to one end of the ninth resistor (R72), the other end of the ninth resistor (R72) is connected to the positive charging terminal of the lithium battery, a collector of the fourth transistor (Q19) is connected to one end of the tenth resistor (R76), the other end of the tenth resistor (R76) is connected to a reference ground, and the one end of the tenth resistor (R76) is further connected to an eleventh terminal of the eleventh resistor (R74), the other end of the eleventh resistor (R74) is connected with the base of the fifth triode (Q21), the emitter of the fifth triode (Q21) is connected with the reference ground, and the collector of the fifth triode (Q21) is connected with the one end of a third resistor (R53) of the discharge control circuit.
7. The protection circuit for the lithium battery with charge and discharge isolation as claimed in claim 1, further comprising an overcharge detection circuit, wherein the overcharge detection circuit is connected to the lithium battery and the charge switch respectively, so as to detect overcharge of the lithium battery and control charge through the charge switch circuit.
8. The protection circuit for the lithium battery with charge and discharge isolation as claimed in claim 1, further comprising an over-current detection circuit, wherein the over-current detection circuit is respectively connected to the discharge switch circuit and the over-charge and over-discharge detection circuit to perform over-current detection on the discharge loop of the lithium battery, and the over-charge and over-discharge detection circuit controls the discharge switch circuit to perform over-current protection.
9. The protection circuit for the lithium battery with charge and discharge isolation as claimed in claim 8, wherein the over-current detection circuit comprises a twelfth resistor (RS1), a thirteenth resistor (R62) and a capacitor (C29), one end of the twelfth resistor (RS1) is connected with a reference ground, the other end of the twelfth resistor (RS1) is connected with the discharge switch circuit, one end of the thirteenth resistor (R62) is connected with the other end of the twelfth resistor (RS1), the other end of the thirteenth resistor (R62) is connected with one end of the capacitor (C29), the other end of the capacitor (C29) is connected with the reference ground, and the other end of the thirteenth resistor (R62) is connected with a current detection end of the over-charge and over-discharge detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921556223.0U CN210792872U (en) | 2019-09-16 | 2019-09-16 | Lithium battery protection circuit is kept apart in charge-discharge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921556223.0U CN210792872U (en) | 2019-09-16 | 2019-09-16 | Lithium battery protection circuit is kept apart in charge-discharge |
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| CN210792872U true CN210792872U (en) | 2020-06-19 |
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| CN201921556223.0U Active CN210792872U (en) | 2019-09-16 | 2019-09-16 | Lithium battery protection circuit is kept apart in charge-discharge |
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