CN220421476U - Reverse connection charging protection circuit for lithium battery - Google Patents
Reverse connection charging protection circuit for lithium battery Download PDFInfo
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- CN220421476U CN220421476U CN202322043926.6U CN202322043926U CN220421476U CN 220421476 U CN220421476 U CN 220421476U CN 202322043926 U CN202322043926 U CN 202322043926U CN 220421476 U CN220421476 U CN 220421476U
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- power supply
- lithium battery
- triode
- resistor
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 59
- 230000001276 controlling effect Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 230000003287 optical effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 1
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a reverse connection charging protection circuit of a lithium battery, which relates to the field of lithium battery protection, and comprises the following components: the power supply module is used for supplying voltage to charge the lithium battery module; the reverse connection protection module is used for detecting whether the power supply module is reversely connected or not, and when the power supply module is reversely connected, a power supply loop between the power supply module and the lithium battery module is disconnected; the BMS battery management module is used for providing charging protection for the lithium battery module and controlling whether the lithium battery module is charged or not; the lithium battery module is used for storing electric energy; compared with the prior art, the utility model has the beneficial effects that: compared with the existing reverse connection preventing circuit, the reverse connection preventing circuit has the advantages that the function of determining whether the equipment or the charger needs to be protected by overcurrent is not needed, the reverse connection protecting module is not needed to be regulated according to the overcurrent protection value of the equipment or the charger, the application range is wide, and the circuit is convenient to design.
Description
Technical Field
The utility model relates to the field of lithium battery protection, in particular to a reverse connection charging protection circuit of a lithium battery.
Background
In a charging circuit of a lithium battery, an anti-reverse connection circuit is often arranged to avoid reverse connection of the battery for charging; referring to fig. 1, the conventional anti-reverse connection circuit is to connect a diode D2 in parallel between the p+/P-terminals of the output terminals, so that the reverse connection device or the charger needs to have an over-current protection function, and the over-current protection value of the device or the charger needs to be known to select the diode, which is complicated in circuit design and needs to be improved.
Disclosure of Invention
The utility model aims to provide a reverse charging protection circuit for a lithium battery, which is used for solving the problems in the background technology.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
a reverse charging protection circuit for a lithium battery, comprising:
the power supply module is used for supplying voltage to charge the lithium battery module;
the reverse connection protection module is used for detecting whether the power supply module is reversely connected or not, and when the power supply module is reversely connected, a power supply loop between the power supply module and the lithium battery module is disconnected;
the BMS battery management module is used for providing charging protection for the lithium battery module and controlling whether the lithium battery module is charged or not;
the lithium battery module is used for storing electric energy;
the power supply module is connected with the reverse connection protection module, the BMS battery management module and the lithium battery module, and the reverse connection protection module is connected with the BMS battery management module.
As still further aspects of the utility model: BMS battery management module includes BMS battery system, MOS pipe Q1, MOS pipe Q4, the one end of lithium battery module, power supply module 'S one end are connected to BMS battery system' S VDD pin, MOS pipe Q1 'S G utmost point is connected through a resistance to BMS battery system' S DO pin, reverse connection protection module, lithium battery module 'S the other end is connected to MOS pipe Q1' S S utmost point, MOS pipe Q4 'S D utmost point is connected to MOS pipe Q1' S D utmost point, BMS battery system 'S CO pin is connected to MOS pipe Q4' S G utmost point, power supply module 'S the other end is connected to MOS pipe Q4' S S utmost point.
As still further aspects of the utility model: the reverse connection protection module comprises a diode D1, a resistor R1 and an optocoupler U2, wherein the negative electrode of the diode D1 is connected with one end of the power supply module, the positive electrode of the diode D1 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with the second end of the optocoupler U2, the first end of the optocoupler U2 is connected with the other end of the power supply module, the third end of the optocoupler U2 is grounded, and the fourth end of the optocoupler U2 is connected with the G electrode of the MOS tube Q1.
As still further aspects of the utility model: the reverse connection protection module comprises a diode D1, a resistor R1, a triode Q2 and a triode Q3, wherein the negative electrode of the diode D1 is connected with one end of the power supply module, the positive electrode of the diode D1 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with the base electrode of the triode Q2, the emitting electrode of the triode Q2 is connected with the other end of the power supply module, the collecting electrode of the triode Q2 is connected with the base electrode of the triode Q3 through a resistor, the collecting electrode of the triode Q3 is connected with the G electrode of the MOS tube Q1, and the emitting electrode of the triode Q3 is grounded.
As still further aspects of the utility model: the reverse connection protection module comprises a diode D1, a resistor R1, a triode Q2 and a MOS tube Q3, wherein the negative electrode of the diode D1 is connected with one end of the power supply module, the positive electrode of the diode D1 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with the base electrode of the triode Q2, the emitting electrode of the triode Q2 is connected with the other end of the power supply module, the collecting electrode of the triode Q2 is connected with the G electrode of the MOS tube Q3 through a resistor, the D electrode of the MOS tube Q3 is connected with the G electrode of the MOS tube Q1, and the S electrode of the MOS tube Q3 is grounded.
Compared with the prior art, the utility model has the beneficial effects that: compared with the existing reverse connection preventing circuit, the reverse connection preventing circuit has the advantages that the function of determining whether the equipment or the charger needs to be protected by overcurrent is not needed, the reverse connection protecting module is not needed to be regulated according to the overcurrent protection value of the equipment or the charger, the application range is wide, and the circuit is convenient to design.
Drawings
Fig. 1 is a circuit diagram of a conventional reverse connection protection circuit for a lithium battery.
Fig. 2 is a first circuit diagram of a reverse charging protection circuit for a lithium battery.
Fig. 3 is a second circuit diagram of a reverse charging protection circuit for a lithium battery.
Fig. 4 is a third circuit diagram of a reverse charging protection circuit for a lithium battery.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present utility model are included in the protection scope of the present utility model.
Referring to fig. 2, 3 and 4, a reverse charging protection circuit for a lithium battery includes:
the power supply module is used for supplying voltage to charge the lithium battery module;
the reverse connection protection module is used for detecting whether the power supply module is reversely connected or not, and when the power supply module is reversely connected, a power supply loop between the power supply module and the lithium battery module is disconnected;
the BMS battery management module is used for providing charging protection for the lithium battery module and controlling whether the lithium battery module is charged or not;
the lithium battery module is used for storing electric energy;
the power supply module is connected with the reverse connection protection module, the BMS battery management module and the lithium battery module, and the reverse connection protection module is connected with the BMS battery management module.
In particular embodiments: referring to fig. 2, 3 and 4, the power supply module is a power supply B1, and under normal conditions, the power supply B1 is in a reverse connection state in fig. 2, 3 and 4; the lithium battery module is formed by connecting a plurality of lithium batteries BATT in series.
In this embodiment: referring to fig. 2, 3 and 4, the BMS battery management module includes a BMS battery system, a MOS transistor Q1 and a MOS transistor Q4, a VDD pin of the BMS battery system is connected to one end of the lithium battery module and one end of the power supply module, a DO pin of the BMS battery system is connected to a G pole of the MOS transistor Q1 through a resistor, and is connected to the reverse protection module, the other end of lithium battery module is connected to MOS pipe Q1 ' S S utmost point, and MOS pipe Q1 ' S D utmost point is connected MOS pipe Q4 ' S D utmost point, and BMS battery system ' S CO pin is connected to MOS pipe Q4 ' S G utmost point, and power supply module ' S the other end is connected to MOS pipe Q4 ' S S utmost point.
The BMS battery system is the prior art, and the protection of the lithium battery module is realized by controlling the conduction conditions of the two MOS tubes Q1 and Q4, and the wiring mode of the BMS battery system and the MOS tubes Q1 and Q4 is the existing wiring mode.
In this embodiment: referring to fig. 2, the reverse connection protection module includes a diode D1, a resistor R1, an optocoupler U2, wherein a cathode of the diode D1 is connected to one end of the power supply module, an anode of the diode D1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to a second end of the optocoupler U2, a first end of the optocoupler U2 is connected to the other end of the power supply module, a third end of the optocoupler U2 is grounded, and a fourth end of the optocoupler U2 is connected to a G pole of the MOS transistor Q1.
When the power supply B1 is reversely connected, a loop is formed by the positive electrode of the power supply B1, the first end of the optical coupler U2, the second end of the optical coupler U2, the resistor R1, the diode D1 and the negative electrode of the power supply B1, the inside of the optical coupler U2 is conducted, the pin No. 3 of the optical coupler U2 is grounded, the potential of the pin No. 4 of the optical coupler U2 is pulled down, namely the G pole (D0-C common point) of the MOS tube Q1 is pulled down, the MOS tube Q1 is cut off, and a power supply loop between the power supply B1 and the lithium battery module is disconnected.
In this embodiment: referring to fig. 3, the reverse connection protection module includes a diode D1, a resistor R1, a triode Q2, and a triode Q3, wherein a cathode of the diode D1 is connected with one end of the power supply module, an anode of the diode D1 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with a base electrode of the triode Q2, an emitter of the triode Q2 is connected with the other end of the power supply module, a collector of the triode Q2 is connected with the base electrode of the triode Q3 through a resistor, a collector of the triode Q3 is connected with a G electrode of the MOS transistor Q1, and an emitter of the triode Q3 is grounded.
When the power supply B1 is reversely connected, the PNP triode Q2 is conducted to provide high level for the base electrode of the triode Q3, the triode Q3 is conducted to pull down the voltage of the G pole (D0-C common point) of the MOS tube Q1, the MOS tube Q1 is cut off, and a power supply loop between the power supply B1 and the lithium battery module is disconnected.
In this embodiment: referring to fig. 4, the reverse connection protection module includes a diode D1, a resistor R1, a triode Q2, and a MOS transistor Q3, wherein a cathode of the diode D1 is connected to one end of the power supply module, an anode of the diode D1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to a base electrode of the triode Q2, an emitter of the triode Q2 is connected to the other end of the power supply module, a collector of the triode Q2 is connected to a G electrode of the MOS transistor Q3 through a resistor, a D electrode of the MOS transistor Q3 is connected to a G electrode of the MOS transistor Q1, and an S electrode of the MOS transistor Q3 is grounded.
When the power supply B1 is reversely connected, the PNP triode Q2 is conducted to provide high level for the base electrode of the MOS tube Q3, the MOS tube Q3 is conducted to pull down the voltage of the G pole (D0-C common point) of the MOS tube Q1, the MOS tube Q1 is cut off, and a power supply loop between the power supply B1 and the lithium battery module is disconnected.
The working principle of the utility model is as follows: the power supply module is used for supplying voltage to charge the lithium battery module; the reverse connection protection module is used for detecting whether the power supply module is reversely connected or not, and when the power supply module is reversely connected, a power supply loop between the power supply module and the lithium battery module is disconnected; the BMS battery management module is used for providing charging protection for the lithium battery module and controlling whether the lithium battery module is charged or not; the lithium battery module is used for storing electric energy.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (5)
1. A lithium battery reverse connection charging protection circuit is characterized in that:
the reverse connection charging protection circuit of the lithium battery comprises:
the power supply module is used for supplying voltage to charge the lithium battery module;
the reverse connection protection module is used for detecting whether the power supply module is reversely connected or not, and when the power supply module is reversely connected, a power supply loop between the power supply module and the lithium battery module is disconnected;
the BMS battery management module is used for providing charging protection for the lithium battery module and controlling whether the lithium battery module is charged or not;
the lithium battery module is used for storing electric energy;
the power supply module is connected with the reverse connection protection module, the BMS battery management module and the lithium battery module, and the reverse connection protection module is connected with the BMS battery management module.
2. The reverse charging protection circuit of the lithium battery according to claim 1, wherein the BMS battery management module comprises a BMS battery system, a MOS tube Q1 and a MOS tube Q4, a VDD pin of the BMS battery system is connected with one end of the lithium battery module and one end of the power supply module, a DO pin of the BMS battery system is connected with a G pole of the MOS tube Q1 through a resistor, the reverse charging protection module is connected with an S pole of the MOS tube Q1, a D pole of the MOS tube Q1 is connected with a D pole of the MOS tube Q4, a G pole of the MOS tube Q4 is connected with a CO pin of the BMS battery system, and an S pole of the MOS tube Q4 is connected with the other end of the power supply module.
3. The reverse-connection charging protection circuit of the lithium battery according to claim 2, wherein the reverse-connection protection module comprises a diode D1, a resistor R1 and an optocoupler U2, wherein a cathode of the diode D1 is connected with one end of the power supply module, an anode of the diode D1 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with a second end of the optocoupler U2, a first end of the optocoupler U2 is connected with the other end of the power supply module, a third end of the optocoupler U2 is grounded, and a fourth end of the optocoupler U2 is connected with a G pole of the MOS transistor Q1.
4. The reverse-connection charging protection circuit of a lithium battery according to claim 2, wherein the reverse-connection protection module comprises a diode D1, a resistor R1, a triode Q2 and a triode Q3, wherein a cathode of the diode D1 is connected with one end of the power supply module, an anode of the diode D1 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with a base electrode of the triode Q2, an emitter of the triode Q2 is connected with the other end of the power supply module, a collector of the triode Q2 is connected with the base electrode of the triode Q3 through a resistor, a collector of the triode Q3 is connected with a G electrode of the MOS transistor Q1, and an emitter of the triode Q3 is grounded.
5. The reverse-connection charging protection circuit of the lithium battery according to claim 2, wherein the reverse-connection protection module comprises a diode D1, a resistor R1, a triode Q2 and a MOS transistor Q3, wherein the cathode of the diode D1 is connected with one end of the power supply module, the anode of the diode D1 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with the base electrode of the triode Q2, the emitter of the triode Q2 is connected with the other end of the power supply module, the collector of the triode Q2 is connected with the G electrode of the MOS transistor Q3 through a resistor, the D electrode of the MOS transistor Q3 is connected with the G electrode of the MOS transistor Q1, and the S electrode of the MOS transistor Q3 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322043926.6U CN220421476U (en) | 2023-08-01 | 2023-08-01 | Reverse connection charging protection circuit for lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322043926.6U CN220421476U (en) | 2023-08-01 | 2023-08-01 | Reverse connection charging protection circuit for lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220421476U true CN220421476U (en) | 2024-01-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322043926.6U Active CN220421476U (en) | 2023-08-01 | 2023-08-01 | Reverse connection charging protection circuit for lithium battery |
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| Country | Link |
|---|---|
| CN (1) | CN220421476U (en) |
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2023
- 2023-08-01 CN CN202322043926.6U patent/CN220421476U/en active Active
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