CN214674320U - Power supply protection circuit of lithium battery pack - Google Patents
Power supply protection circuit of lithium battery pack Download PDFInfo
- Publication number
- CN214674320U CN214674320U CN202120776736.3U CN202120776736U CN214674320U CN 214674320 U CN214674320 U CN 214674320U CN 202120776736 U CN202120776736 U CN 202120776736U CN 214674320 U CN214674320 U CN 214674320U
- Authority
- CN
- China
- Prior art keywords
- power supply
- resistor
- protection
- lithium battery
- battery pack
- Prior art date
- 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.)
- Active
Links
Images
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Protection Of Static Devices (AREA)
- Secondary Cells (AREA)
Abstract
The utility model discloses a power supply protection circuit of a lithium battery pack, which comprises a protection power supply circuit and a battery management module, and is connected with the lithium battery pack through the protection power supply circuit so as to detect and output the power protection of the lithium battery pack; the battery management module is respectively connected with the protection power supply circuit and the charge and discharge switch circuit, so that the protection power supply circuit acquires a power supply source, and detects the abnormality of the lithium battery pack, and the charge and discharge circuit loop of the lithium battery pack is cut off and controlled through the charge and discharge switch circuit. Therefore, the protection power supply circuit is adopted to directly output the voltage of the lithium battery pack to the battery management module in a unified mode, the battery management module can carry out protection detection on the lithium battery pack when supplying power for the battery management module, the use of a connecting line is reduced, the fault rate generated due to the connecting line is reduced, and the lithium battery is better managed.
Description
Technical Field
The utility model relates to a lithium battery protection circuit technical field especially relates to a lithium cell group power supply protection circuit.
Background
Lithium (Li) ion batteries are increasingly widely used as energy storage and power supply batteries, and during the use of the lithium (Li) ion batteries, a protection circuit board is generally required to protect the lithium batteries from being charged, so that the phenomenon of overcharge or overdischarge of the lithium batteries during the use is avoided, and the service life of the lithium batteries is ensured. Lithium cell protection shield mainly detects each section lithium cell through lithium cell detection chip to output control signal to the return circuit control switch in the lithium cell return circuit, among the prior art, adopt directly to be connected lithium cell detection chip and each section lithium cell usually, in order to protect each section lithium cell, this kind of mode leads to the connecting wire relatively more, produces the trouble easily, can't manage lithium cell well.
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 present invention is to provide a power supply protection circuit for a lithium battery pack.
In order to achieve the above object, an embodiment of the present invention provides a power supply protection circuit for a lithium battery pack, the power supply protection circuit for the lithium battery pack includes:
the protection power supply circuit is connected with the lithium battery pack so as to protect, detect and output the power supply of the lithium battery pack;
and the battery management module is respectively connected with the protection power supply circuit and the charge and discharge switch circuit, so that the protection power supply circuit acquires a power supply source, and detects the abnormity of the lithium battery pack to cut off and turn off the charge and discharge circuit loop of the lithium battery pack through the charge and discharge switch circuit.
Further, according to an embodiment of the present invention, the protection power supply circuit includes:
an emitter of the first triode QV2 is connected with an abnormal detection end and a power supply end of the battery management module, and a collector of the first triode QV2 is connected with a power supply output end of the lithium battery pack through a first resistor RV 1;
a second triode QV1, wherein the base of the first triode QV2 is connected with the emitter of the second triode QV1, and the collector of the second triode QV1 is connected with the power output end of the lithium battery pack through a second resistor RV 3;
and the cathode of the first voltage-stabilizing diode VD3 is connected with the base of the second triode QV1, and the anode of the first voltage-stabilizing diode VD3 is connected with the reference ground.
Further, according to an embodiment of the present invention, the protection power supply circuit further includes:
and the cathode of the second voltage-stabilizing diode VD4 is connected with the emitter of the first triode QV2, and the anode of the second voltage-stabilizing diode VD4 is connected with the reference ground.
Further, according to an embodiment of the present invention, the protection power supply circuit further includes:
a first capacitor C2, one end of the first capacitor C2 and the cathode of the second zener diode VD4 are connected to the emitter of the first transistor QV2, and the other end of the first capacitor C2 is connected to the ground reference.
Further, according to an embodiment of the present invention, the protection power supply circuit further includes:
and one end of the second capacitor C1 is connected with the cathode of the second voltage-stabilizing diode VD4, and the other end of the first capacitor C2 is connected with the reference ground.
Further, according to an embodiment of the present invention, the battery management module includes:
a power supply chip UI 1;
one end of the fourth resistor RJ1 is connected with the power output end of the protection power supply circuit, and the other end of the fourth resistor RJ1 is connected with the first voltage detection end of the power chip UI 1;
one end of the fifth resistor RJ5 is connected with the power output end of the protection power supply circuit;
one end of the sixth resistor RJ2 is connected to the other end of the fifth resistor RJ5, and the other end of the sixth resistor RJ2 is connected to the second voltage detection end of the power chip UI 1;
a seventh resistor RJ6, one end of the seventh resistor RJ6 being connected with the other end of the fifth resistor RJ 5;
one end of the eighth resistor RJ3 is connected to the other end of the seventh resistor RJ6, and the other end of the eighth resistor RJ3 is connected to a third voltage detection end of the power chip UI 1;
a ninth resistor RJ7, wherein one end of the ninth resistor RJ7 is connected with the other end of the seventh resistor RJ 6;
a tenth resistor RJ4, wherein one end of the tenth resistor RJ4 is connected with the other end of the ninth resistor RJ7, and the other end of the tenth resistor RJ4 is connected with a fourth voltage detection end of the power chip UI 1;
an eleventh resistor RJ8, one end of the eleventh resistor RJ8 is connected with the other end of the ninth resistor RJ7, and the other end of the eleventh resistor RJ8 is connected with a reference ground.
Further, according to an embodiment of the present invention, the battery management module further includes:
two ends of the third capacitor CB1 are connected with the first voltage detection end and the second voltage detection end of the power supply chip UI1 respectively;
two ends of the fourth capacitor CB2 are connected to the second voltage detection end and the third voltage detection end of the power supply chip UI1, respectively;
two ends of the fifth capacitor CB3 are connected with the third voltage detection end and the fourth voltage detection end of the power supply chip UI1, respectively;
two ends of the sixth capacitor CB4 are connected to the fourth voltage detection end and the reference ground end of the power supply chip UI1, respectively.
Further, according to an embodiment of the present invention, the battery management module further includes:
a diode DC4, the protection power supply circuit being connected to the power supply terminal of the battery management module through the diode DC 4; the anode of the diode DC4 is connected with the power protection detection and output end of the protection power supply circuit, and the cathode of the diode DC4 is connected with the power supply end of the battery management module.
Further, according to an embodiment of the present invention, the battery management module further includes:
a third zener diode D2, the cathode of the third zener diode D2 being connected to the power supply terminal of the battery management module, the anode of the third zener diode D2 being connected to ground;
one end of the seventh capacitor CD2 is connected to the power supply end of the battery management module, and the other end of the seventh capacitor CD2 is connected to the reference ground.
The embodiment of the utility model provides a lithium battery pack power supply protection circuit is connected with the lithium battery pack through the protection power supply circuit, so as to detect and output the power protection of the lithium battery pack; the battery management module is respectively connected with the protection power supply circuit and the charge and discharge switch circuit, so that the protection power supply circuit acquires a power supply source, and detects the abnormality of the lithium battery pack, and the charge and discharge circuit loop of the lithium battery pack is cut off and controlled through the charge and discharge switch circuit. Therefore, the protection power supply circuit is adopted to directly output the voltage of the lithium battery pack to the battery management module in a unified mode, the battery management module can carry out protection detection on the lithium battery pack when supplying power for the battery management module, the use of a connecting line is reduced, the fault rate generated due to the connecting line is reduced, and the lithium battery is better managed.
Drawings
Fig. 1 is a block diagram of a power supply protection circuit of a lithium battery pack according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a battery management module according to an embodiment of the present invention;
fig. 3 is a circuit diagram of the protection power supply circuit provided by the embodiment of the present invention.
Reference numerals:
a switching circuit 101;
a fast drive circuit 102;
a second control circuit 103;
a load 104;
a lithium battery 105.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
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 to 3, an embodiment of the present invention provides a power supply protection circuit for a lithium battery pack 104, including: the protection power supply circuit 102 is connected with the lithium battery pack 104, so as to detect and output the power protection of the lithium battery pack 104; as shown in fig. 1 and fig. 3, the protection power supply circuit 102 is connected to a power output terminal of the lithium battery pack 104, so as to lead out the lithium battery pack 104 with power protection, so as to provide power supply for a back-end circuit. For example, power is supplied to each circuit module of the lithium battery protection board.
The battery management module 101 is respectively connected with the protection power supply circuit 102 and the charge and discharge switch circuit 103, so that the protection power supply circuit 102 obtains a power supply source, and detects the abnormality of the lithium battery pack 104, and the charge and discharge circuit loop of the lithium battery pack 104 is cut off and controlled through the charge and discharge switch circuit 103. That is, the protection power supply circuit 102 outputs the power drawn by the lithium battery pack 104 to the battery management module 101, and on the one hand, the protection power supply circuit can provide power supply for the battery management module 101. On the other hand, the detection voltage of the lithium battery pack 104 of the battery management module 101 can be used, so that when the lithium battery pack 104 is abnormal, the battery management module 101 can control the cutoff of the charging and discharging backflow, and thus the management and the protection of the lithium battery pack can be met, and because the power supply and the detection voltage only need to be introduced through the protection power supply circuit 102, excessive connecting wires are not needed, the detection voltage power supply can be obtained because the battery management module 101 needs to be connected with the lithium battery pack 104 through a plurality of connecting wires, and the fault rate of the protection circuit is reduced.
The embodiment of the utility model provides a lithium battery pack 104 power supply protection circuit, is connected with lithium battery pack 104 through protection power supply circuit 102 to detect and output the power protection of lithium battery pack 104; the battery management module 101 is respectively connected with the protection power supply circuit 102 and the charge and discharge switch circuit 103, so that the protection power supply circuit 102 obtains a power supply source, and detects the abnormality of the lithium battery pack 104, and the charge and discharge circuit loop of the lithium battery pack 104 is cut off and switched off through the charge and discharge switch circuit 103. Therefore, the protection power supply circuit 102 is adopted to directly output the voltage of the lithium battery pack 104 to the battery management module 101 in a unified manner, the battery management module 101 can carry out protection detection on the lithium battery pack 104 while supplying power to the battery management module 101, the use of connecting wires is reduced, the fault rate caused by the connecting wires is reduced, and the lithium battery is better managed.
Referring to fig. 2, the protection power supply circuit 102 includes: the battery management module 101 comprises a first triode QV2, a second triode QV1 and a first voltage stabilizing diode VD3, wherein an emitting electrode of the first triode QV2 is connected with an abnormal detection end and a power supply end of the battery management module 101, and a collecting electrode of the first triode QV2 is connected with a power supply output end of the lithium battery pack 104 through a first resistor RV 1; through first triode QV2 establishes ties on power supply and detection return circuit, can carry out the protection output of power to power supply and detection return circuit like this to supply power and protect the circuit of the output of first triode QV2, when avoiding the power supply to appear unusually, for example when appearing pulse high voltage, probably damage phenomenon such as back-end circuit and produce.
The base electrode of the first triode QV2 is connected with the emitter electrode of the second triode QV1, and the collector electrode of the second triode QV1 is connected with the power supply output end of the lithium battery pack 104 through a second resistor RV 3; the first triode QV2 is arranged between the base of the triode QD1 and the first voltage-stabilizing diode VD3, so that the first triode QV2 can be driven quickly. For example, when the circuit is normally powered, the first transistor QV2 is turned on, and the emitter of the second transistor QV1 can provide enough on current for the base of the first transistor QV2 quickly, so that the first transistor QV2 can be turned on quickly, and similarly, when the input power supply voltage has high-voltage pulse abnormality, the first transistor QV2 can also ensure that the output current voltage of the second transistor QV1 does not exceed the set value.
The cathode of the first voltage-stabilizing diode VD3 is connected with the base of the second triode QV1, and the anode of the first voltage-stabilizing diode VD3 is connected with the reference ground.
Referring to fig. 2, the protection power supply circuit 102 further includes: and the cathode of the second voltage-stabilizing diode VD4 is connected with the emitter of the first triode QV2, and the anode of the second voltage-stabilizing diode VD4 is connected with the reference ground. As shown in fig. 2, the second voltage regulator VD4 is disposed between the power output terminal of the protection power supply circuit 102 and the ground, so that the output voltage can be further protected from the pulse high voltage burning out the battery management module 101.
Referring to fig. 2, the protection power supply circuit 102 further includes: a first capacitor C2, one end of the first capacitor C2 and the cathode of the second zener diode VD4 are connected to the emitter of the first transistor QV2, and the other end of the first capacitor C2 is connected to the ground reference. As shown in fig. 2, the first capacitor C2 is disposed between the power output end of the protection power supply circuit 102 and the reference ground, so as to further protect the output voltage and prevent the pulse high voltage from burning out the battery management module 101, and since the first capacitor C2 can filter the pulse high voltage, it is ensured that the pulse high voltage is not output to the power supply and detection end of the battery management module 101, the high voltage pulse electricity is usually the high voltage pulse electricity that may be generated when the power supply end of the lithium battery is connected to the load, and this electricity is usually not necessary to determine that the power supply of the lithium battery is abnormal, and it is only necessary to directly filter it.
Referring to fig. 2, the protection power supply circuit 102 further includes: and one end of the second capacitor C1 is connected with the cathode of the second voltage-stabilizing diode VD4, and the other end of the first capacitor C2 is connected with the reference ground. As shown in fig. 2, the second capacitor C1 is disposed between the base of the second transistor QV1 and the reference ground, and the second capacitor C1 can filter the high voltage pulse, so as to ensure that no high voltage pulse signal appears at the base of the second transistor QV1, and the high voltage pulse signal is directly filtered out, thereby ensuring the relative stability of the base supply voltage of the second transistor QV 1.
Referring to fig. 1 and 3, the battery management module 101 includes: a power supply chip UI1, a fourth resistor RJ1, a fifth resistor RJ5, a sixth resistor RJ2, a seventh resistor RJ6, an eighth resistor RJ3, a ninth resistor RJ7, a tenth resistor RJ4 and an eleventh resistor RJ8, wherein one end of the fourth resistor RJ1 is connected with the power supply output end of the protection power supply circuit 102, and the other end of the fourth resistor RJ1 is connected with the first voltage detection end of the power supply chip UI 1; one end of the fifth resistor RJ5 is connected to the power output end of the protection power supply circuit 102; one end of the sixth resistor RJ2 is connected to the other end of the fifth resistor RJ5, and the other end of the sixth resistor RJ2 is connected to the second voltage detection terminal of the power chip UI 1; one end of the seventh resistor RJ6 is connected with the other end of the fifth resistor RJ 5; one end of the eighth resistor RJ3 is connected to the other end of the seventh resistor RJ6, and the other end of the eighth resistor RJ3 is connected to the third voltage detection terminal of the power chip UI 1; one end of the ninth resistor RJ7 is connected with the other end of the seventh resistor RJ 6; one end of the tenth resistor RJ4 is connected to the other end of the ninth resistor RJ7, and the other end of the tenth resistor RJ4 is connected to the fourth voltage detection terminal of the power chip UI 1; one end of the eleventh resistor RJ8 is connected to the other end of the ninth resistor RJ7, and the other end of the eleventh resistor RJ8 is connected to a ground reference. As shown in fig. 2, a voltage divider circuit is formed among the fifth resistor RJ5, the seventh resistor RJ6, the ninth resistor RJ7 and the eleventh resistor RJ8, so that after the power voltage of the lithium battery pack 104 introduced by the protection power supply circuit 102 is divided, the divided power voltage is output to the power chip UI1 through the fourth resistor RJ1, the sixth resistor RJ2, the eighth resistor RJ3 and the tenth resistor RJ4 to perform voltage anomaly detection, so as to perform anomaly detection on the battery and on-off control of the lithium battery charging and discharging circuit.
Referring to fig. 2, the battery management module 101 further includes: the power supply chip UI1 comprises a third capacitor CB1, a fourth capacitor CB2, a fifth capacitor CB3 and a sixth capacitor CB4, wherein two ends of the third capacitor CB1 are respectively connected with a first voltage detection end and a second voltage detection end of the power supply chip UI 1; two ends of the fourth capacitor CB2 are respectively connected with the second voltage detection end and the third voltage detection end of the power supply chip UI 1; two ends of the fifth capacitor CB3 are respectively connected with the third voltage detection end and the fourth voltage detection end of the power supply chip UI 1; two ends of the sixth capacitor CB4 are respectively connected to the fourth voltage detection end of the power chip UI1 and the reference ground end. The detection power supply is filtered by the third capacitor CB1, the fourth capacitor CB2, the fifth capacitor CB3 and the sixth capacitor CB4 and then output to the power supply chip UI1 to carry out voltage abnormity detection on the lithium battery pack 104, and therefore false detection is avoided. Since the overcharge and overdischarge voltages of the lithium battery pack 104 are relatively stable voltages, the third capacitor CB1, the fourth capacitor CB2, the fifth capacitor CB3 and the sixth capacitor CB4 can respectively filter out interference voltages.
Referring to fig. 2, the battery management module 101 further includes: a diode DC4, wherein the protection power supply circuit 102 is connected with the power supply terminal of the battery management module 101 through the diode DC 4; wherein the anode of the diode DC4 is connected to the power protection detection and output terminal of the protection power supply circuit 102, and the cathode of the diode DC4 is connected to the power supply terminal of the battery management module 101. Through the unidirectional conductivity of the diode, a reverse power supply can be prevented from appearing in the power supply circuit, so that the power supply chip UI1 is prevented from being burnt out by the reverse power supply.
Referring to fig. 2, the battery management module 101 further includes: a third zener diode D2 and a seventh capacitor CD2, a cathode of the third zener diode D2 being connected to the power supply terminal of the battery management module 101, an anode of the third zener diode D2 being connected to a reference ground; since the lithium battery pack 104 may have a relatively high voltage during the over-voltage charging, the third zener diode D2 can ensure the relative stability of the voltage at the power supply terminal of the power chip UI 1.
One end of the seventh capacitor CD2 is connected to the power supply end of the battery management module 101, and the other end of the seventh capacitor CD2 is connected to the reference ground; the energy storage and filtering functions of the seventh capacitor CD2 ensure the relative stability of the voltage of the power supply end of the power supply chip UI 1.
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 lithium battery pack power supply protection circuit is characterized by comprising:
the protection power supply circuit is connected with the lithium battery pack so as to protect, detect and output the power supply of the lithium battery pack;
and the battery management module is respectively connected with the protection power supply circuit and the charge and discharge switch circuit, so that the protection power supply circuit acquires a power supply source, and detects the abnormity of the lithium battery pack to cut off and turn off the charge and discharge circuit loop of the lithium battery pack through the charge and discharge switch circuit.
2. The lithium battery pack power supply protection circuit of claim 1, wherein the protection power supply circuit comprises:
a first triode (QV2), wherein an emitter of the first triode (QV2) is connected with an abnormal detection end and a power supply end of the battery management module, and a collector of the first triode (QV2) is connected with a power supply output end of the lithium battery pack through a first resistor (RV 1);
a second triode (QV1), wherein the base of the first triode (QV2) is connected with the emitter of the second triode (QV1), and the collector of the second triode (QV1) is connected with the power supply output end of the lithium battery pack through a second resistor (RV 3);
a first voltage-stabilizing diode (VD3), wherein the cathode of the first voltage-stabilizing diode (VD3) is connected with the base electrode of the second triode (QV1), and the anode of the first voltage-stabilizing diode (VD3) is connected with the reference ground.
3. The lithium battery pack power supply protection circuit of claim 2, wherein the protection power supply circuit further comprises:
a second zener diode (VD4), the cathode of the second zener diode (VD4) being connected to the emitter of the first triode (QV2), and the anode of the second zener diode (VD4) being connected to ground.
4. The lithium battery pack power supply protection circuit of claim 3, wherein the protection power supply circuit further comprises:
a first capacitor (C2), wherein one end of the first capacitor (C2) and the cathode of the second voltage-stabilizing diode (VD4) are connected with the emitter of the first triode (QV2), and the other end of the first capacitor (C2) is connected with the reference ground.
5. The lithium battery pack power supply protection circuit of claim 4, wherein the protection power supply circuit further comprises:
a second capacitor (C1), one end of the second capacitor (C1) is connected with the cathode of the second voltage-stabilizing diode (VD4), and the other end of the first capacitor (C2) is connected with the reference ground.
6. The lithium battery pack power supply protection circuit of claim 1, wherein the battery management module comprises:
a power supply chip (UI 1);
one end of the fourth resistor (RJ1) is connected with the power output end of the protection power supply circuit, and the other end of the fourth resistor (RJ1) is connected with the first voltage detection end of the power chip (UI 1);
a fifth resistor (RJ5), wherein one end of the fifth resistor (RJ5) is connected with the power output end of the protection power supply circuit;
a sixth resistor (RJ2), wherein one end of the sixth resistor (RJ2) is connected with the other end of the fifth resistor (RJ5), and the other end of the sixth resistor (RJ2) is connected with the second voltage detection end of the power supply chip (UI 1);
a seventh resistor (RJ6), one end of the seventh resistor (RJ6) being connected with the other end of the fifth resistor (RJ 5);
an eighth resistor (RJ3), one end of the eighth resistor (RJ3) being connected to the other end of the seventh resistor (RJ6), the other end of the eighth resistor (RJ3) being connected to the third voltage detection terminal of the power chip (UI 1);
a ninth resistor (RJ7), one end of the ninth resistor (RJ7) being connected with the other end of the seventh resistor (RJ 6);
a tenth resistor (RJ4), one end of the tenth resistor (RJ4) being connected to the other end of the ninth resistor (RJ7), the other end of the tenth resistor (RJ4) being connected to a fourth voltage detection terminal of the power chip (UI 1);
an eleventh resistor (RJ8), one end of the eleventh resistor (RJ8) being connected with the other end of the ninth resistor (RJ7), the other end of the eleventh resistor (RJ8) being connected with a reference ground.
7. The lithium battery pack power protection circuit of claim 6, wherein the battery management module further comprises:
a third capacitor (CB1), wherein two ends of the third capacitor (CB1) are respectively connected with the first voltage detection end and the second voltage detection end of the power supply chip (UI 1);
a fourth capacitor (CB2), wherein two ends of the fourth capacitor (CB2) are respectively connected with the second voltage detection end and the third voltage detection end of the power supply chip (UI 1);
a fifth capacitor (CB3), wherein two ends of the fifth capacitor (CB3) are respectively connected with the third voltage detection end and the fourth voltage detection end of the power supply chip (UI 1);
and two ends of the sixth capacitor (CB4) are respectively connected with the fourth voltage detection end and the reference ground end of the power supply chip (UI 1).
8. The lithium battery pack power protection circuit of claim 2, wherein the battery management module further comprises:
a diode (DC4), wherein the protection power supply circuit is connected with the power supply end of the battery management module through the diode (DC 4); wherein the anode of the diode (DC4) is connected with the power protection detection and output end of the protection power supply circuit, and the cathode of the diode (DC4) is connected with the power supply end of the battery management module.
9. The lithium battery pack power protection circuit of claim 8, wherein the battery management module further comprises:
a third zener diode (D2), the cathode of the third zener diode (D2) being connected to the power supply terminal of the battery management module, the anode of the third zener diode (D2) being connected to a reference ground;
a seventh capacitor (CD2), one end of the seventh capacitor (CD2) is connected with the power supply end of the battery management module, and the other end of the seventh capacitor (CD2) is connected with the reference ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120776736.3U CN214674320U (en) | 2021-04-15 | 2021-04-15 | Power supply protection circuit of lithium battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120776736.3U CN214674320U (en) | 2021-04-15 | 2021-04-15 | Power supply protection circuit of lithium battery pack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214674320U true CN214674320U (en) | 2021-11-09 |
Family
ID=78462844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120776736.3U Active CN214674320U (en) | 2021-04-15 | 2021-04-15 | Power supply protection circuit of lithium battery pack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214674320U (en) |
-
2021
- 2021-04-15 CN CN202120776736.3U patent/CN214674320U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105119365A (en) | Dual-channel DC power supply automatic switching device | |
| CN101789585A (en) | Secondary battery protection circuit | |
| CN201075839Y (en) | Switch power supply for storing electricity | |
| CN208257490U (en) | A kind of photovoltaic energy storage device | |
| CN109936194B (en) | Power supply circuit of battery management system | |
| CN214674320U (en) | Power supply protection circuit of lithium battery pack | |
| CN212572122U (en) | Constant-current voltage-limiting automatic power-off charger | |
| CN210016273U (en) | Battery pack under-voltage protection circuit with hysteresis | |
| CN205407574U (en) | Direct current voltage stabilizing circuit | |
| CN212518430U (en) | Storage battery constant-current charging and discharging management circuit in distribution network backup power supply | |
| CN209472415U (en) | Power-supply system | |
| CN104283195A (en) | Storage battery protection circuit preventing overcharge | |
| CN102611149A (en) | Charging circuit of outdoor online monitoring device | |
| CN219513815U (en) | Charger circuit | |
| CN219164275U (en) | Storage battery pack charge-discharge protection circuit | |
| CN219086825U (en) | Charge-discharge indicator lamp circuit and electric appliance | |
| CN215343961U (en) | Power supply circuit of lithium battery pack | |
| CN110912086A (en) | Reverse connection prevention protection circuit of storage battery charger | |
| CN213930719U (en) | Solar energy lighting device | |
| CN221042369U (en) | Automatic turn-off protection device for under-voltage battery and electronic equipment | |
| CN218124357U (en) | Anticreep circuit suitable for lithium electricity BMS divides mouthful circuit | |
| CN216720949U (en) | Charge-discharge protection device and starting power supply equipment | |
| CN216981563U (en) | Battery charging and discharging circuit | |
| CN213213142U (en) | Power management system of handheld device | |
| CN213457805U (en) | Multifunctional voltage stabilizing circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |