CN211720295U - Lithium battery protection board charging self-locking circuit - Google Patents
Lithium battery protection board charging self-locking circuit Download PDFInfo
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- CN211720295U CN211720295U CN202020531128.1U CN202020531128U CN211720295U CN 211720295 U CN211720295 U CN 211720295U CN 202020531128 U CN202020531128 U CN 202020531128U CN 211720295 U CN211720295 U CN 211720295U
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Abstract
The utility model discloses a lithium cell protection shield self-locking circuit that charges, resistance R1, zener diode ZD1 and resistance R4 constitute the drive circuit who charges MOS pipe Q1, guarantee MOS pipe Q1's normal conduction, when multisection lithium battery management chip U1 detected battery protection voltage, chip U1 pin CHG can export high level signal. The triode V3 is controlled to work through the diode D3, the resistor R7 and the resistor R8, the resistor R2, the resistor R3, the resistor R5, the resistor R6 and the triode V3 form a loop to respectively drive the triode V1 and the triode V2, the triode V1 works due to the fact that the resistor R2 and the resistor R3 form a bias circuit, the triode V1 is conducted, the GS voltage of the charging MOS tube Q1 is 0V, the MOS tube Q1 is not conducted, the circuit stops charging, and self-locking is formed at the same time. The utility model discloses as long as the charger does not cut off the power supply, charging circuit can lock forever, can not carry out the recharges to the battery, guarantees the security of battery.
Description
Technical Field
The utility model relates to a self-locking circuit charges, especially a lithium battery protection board self-locking circuit that charges belongs to lithium battery control circuit field.
Background
With the wide application of lithium batteries, the control requirements for lithium batteries are also higher and higher. Lithium batteries are particularly important for controlling the charging process of lithium batteries because lithium metal is generated by chemical reactions during the charging process. The safe and reasonable charging mode can ensure the charging reliability of the lithium battery, and in order to ensure that the lithium battery does not repeatedly supplement the charging to the battery after being fully charged, a self-locking circuit for controlling the charging protection of the lithium battery needs to be designed to prevent the battery from being repeatedly charged in a state of being connected with a charger.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a lithium battery protection shield self-locking circuit that charges is provided, prevents that the battery from carrying out the repeated charging under the state of connecting the charger.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is:
the utility model provides a lithium battery protection board self-locking circuit that charges which characterized in that: the battery management system comprises a plurality of lithium battery management chips U1, a VCC pin of the plurality of lithium battery management chips U1 is connected with a positive electrode B + of a battery pack and a D electrode of an MOS tube Q1, an S electrode of the MOS tube Q1 is connected with one end of a resistor R2, an emitter electrode of a triode V1, one end of a resistor R1, a negative electrode of a Zener diode ZD1, a positive electrode C + of a charger, one end of a resistor R5 and an emitter electrode of a triode V2, the other end of a resistor R2 is connected with a base electrode of a triode V1 and one end of a resistor R3, a G electrode of the MOS tube Q3 is connected with a collector electrode of the triode V3, the other end of the resistor R3, a positive electrode of the Zener diode ZD 3 and one end of the resistor R3, the other end of the resistor R3 is connected with a collector electrode of the triode V3 and one end of the resistor R3, the other end of the resistor R3, a collector electrode of the triode V3 is connected with an anode of the triode D3, the other end of the resistor R7 is connected with one end of a resistor R8 and the base electrode of the triode V3, and the other end of the resistor R8 is connected with the cathode B-of the battery pack, the emitter of the triode V3, the other end of the resistor R4 and the cathode Port of the charger.
Further, a charging backflow prevention controller D1 is arranged between the positive electrode B + of the battery pack and the D electrode of the MOS tube Q1, the positive electrode B + of the battery pack is connected with the cathode of the charging backflow prevention controller D1, and the anode of the charging backflow prevention controller D1 is connected with the D electrode of the MOS tube Q1.
Further, a diode D2 is arranged between the resistor R7 and the CHG pin of the multi-lithium battery management chip U1, the anode of the diode D2 is connected to the CHG pin of the multi-lithium battery management chip U1, and the cathode of the diode D2 is connected to one end of the resistor R7.
Furthermore, a capacitor C1 is arranged between the base electrode of the triode V3 and the cathode B-of the battery pack, one end of the capacitor C1 is connected with the base electrode of the triode V3, and the other end of the capacitor C1 is connected with the cathode B-of the battery pack.
Further, the multiple lithium battery management chips U1 adopt multiple lithium battery management chips with the model number Oz-8952.
Compared with the prior art, the utility model, have following advantage and effect: the utility model discloses a lithium battery protection board self-locking circuit that charges simple structure, drive current control is convenient, and is with low costs, control is nimble, the fault rate is low, overcome in the current lithium electric protection circuit behind the battery charging protection, because the voltage drop of battery self, carry out rechargeable to the battery after reaching the charging recovery voltage of battery, the demonstration performance of charger carries out the clearance for the battery and charges, can let the user normally produce worry to the battery, can guarantee through this circuit that the battery can not appear showing unusually after charging, can the safe use battery.
Drawings
Fig. 1 is a schematic diagram of the lithium battery protection board charging self-locking circuit of the present invention.
Detailed Description
To elaborate on the technical solution adopted by the present invention for achieving the predetermined technical purpose, the technical solution in the embodiment of the present invention will be clearly and completely described below by combining with the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a partial embodiment of the present invention, not a whole embodiment, and technical means or technical features in the embodiment of the present invention can be replaced without paying creative efforts, and the present invention will be described in detail below by combining with the embodiments with reference to the drawings.
As shown in fig. 1, the self-locking circuit for charging a lithium battery protection board of the present invention comprises a plurality of lithium battery management chips U1, a VCC pin of the plurality of lithium battery management chips U1 is connected to an anode B + of a battery pack and a cathode of a charging backflow prevention controller D1, an anode of the charging backflow prevention controller D1 is connected to a D-pole of a MOS transistor Q1, an S-pole of the MOS transistor Q1 is connected to one end of a resistor R2, an emitter of a transistor V1, one end of a resistor R1, a cathode of a zener diode ZD1, an anode C + of a charger, one end of a resistor R5 and an emitter of a transistor V2, the other end of a resistor R2 is connected to a base of a transistor V1 and one end of a resistor R3, a G-pole of the MOS transistor Q1 is connected to a collector of a transistor V1, the other end of the resistor R1, an anode of a resistor R1 and one end of a resistor R4, the other end of a resistor R3 is connected to a collector of a transistor V3 and one end of a base, the collector of the triode V2 is connected with the anode of the triode D3, the cathode of the triode D3 is connected with the cathode of the diode D2 and one end of the resistor R7, the anode of the diode D2 is connected with the CHG pin of the multi-section lithium battery management chip U1, the other end of the resistor R7 is connected with one end of the resistor R8, the base of the triode V3 and one end of the capacitor C1, and the other end of the resistor R8 is connected with the cathode B-, the emitter of the triode V3, the other end of the capacitor C1, the other end of the resistor R4 and the negative Port of the charger.
The multiple lithium battery management chips U1 adopt multiple lithium battery management chips with the model number Oz-8952 of a concave-convex factory.
The utility model discloses a theory of operation does: after the charger is connected, the resistor R1, the voltage stabilizing diode ZD1 and the resistor R4 form a driving circuit of the charging MOS transistor Q1, and normal conduction of the MOS transistor Q1 is ensured. When the multi-lithium battery management chip U1 detects the battery protection voltage, the chip U1 pin CHG outputs a high level signal. The diode D3, the resistor R7 and the resistor R8 control the operation of the triode V3, and the capacitor C1 plays a role in delay filtering. After the low level of the triode V3 is changed into a high level signal when the CHG level is normal, the triode V3 starts to work, the resistor R2, the resistor R3, the resistor R5, the resistor R6 and the triode V3 form a loop to respectively drive the triode V1 and the triode V2, and the triode V1 works because the resistor R2 and the resistor R3 form a bias circuit, the triode V1 is conducted, the voltage of the GS of the charging MOS transistor Q1 is 0V, the MOS transistor Q1 is not conducted, and the circuit stops charging. Meanwhile, the resistor R5 and the resistor R6 form a bias circuit to enable the triode V2 to work, the triode V2 is conducted, driving voltage is provided for the triode V3 through the diode D2, and the triode V3 is ensured to be always conducted to form self-locking. The high level is provided to maintain the transistor V3 to work, so that the charging loop can be always locked as long as the charger is not powered off, and the battery can not be repeatedly charged even if the voltage of the battery changes, thereby ensuring the safety of the battery.
The utility model discloses a lithium battery protection board self-locking circuit that charges simple structure, drive current control is convenient, and is with low costs, control is nimble, the fault rate is low, overcome in the current lithium electric protection circuit behind the battery charging protection, because the voltage drop of battery self, carry out rechargeable to the battery after reaching the charging recovery voltage of battery, the demonstration performance of charger carries out the clearance for the battery and charges, can let the user normally produce worry to the battery, can guarantee through this circuit that the battery can not appear showing unusually after charging, can the safe use battery.
Above, only the preferred embodiment of the present invention has been described, but not to limit the present invention in any form, and although the present invention has been disclosed with the preferred embodiment, but not to limit the present invention, any skilled person familiar with the art can make some changes or modifications to equivalent embodiments with equivalent changes within the technical scope of the present invention, but all the technical matters of the present invention do not depart from the technical scope of the present invention.
Claims (5)
1. The utility model provides a lithium battery protection board self-locking circuit that charges which characterized in that: the battery management system comprises a plurality of lithium battery management chips U1, a VCC pin of the plurality of lithium battery management chips U1 is connected with a positive electrode B + of a battery pack and a D electrode of an MOS tube Q1, an S electrode of the MOS tube Q1 is connected with one end of a resistor R2, an emitter electrode of a triode V1, one end of a resistor R1, a negative electrode of a Zener diode ZD1, a positive electrode C + of a charger, one end of a resistor R5 and an emitter electrode of a triode V2, the other end of a resistor R2 is connected with a base electrode of a triode V1 and one end of a resistor R3, a G electrode of the MOS tube Q3 is connected with a collector electrode of the triode V3, the other end of the resistor R3, a positive electrode of the Zener diode ZD 3 and one end of the resistor R3, the other end of the resistor R3 is connected with a collector electrode of the triode V3 and one end of the resistor R3, the other end of the resistor R3, a collector electrode of the triode V3 is connected with an anode of the triode D3, the other end of the resistor R7 is connected with one end of a resistor R8 and the base electrode of the triode V3, and the other end of the resistor R8 is connected with the cathode B-of the battery pack, the emitter of the triode V3, the other end of the resistor R4 and the cathode Port of the charger.
2. The lithium battery protection panel charging self-locking circuit as claimed in claim 1, wherein: a charging anti-backflow controller D1 is arranged between the positive pole B + of the battery pack and the D pole of the MOS tube Q1, the positive pole B + of the battery pack is connected with the cathode of the charging anti-backflow controller D1, and the anode of the charging anti-backflow controller D1 is connected with the D pole of the MOS tube Q1.
3. The lithium battery protection panel charging self-locking circuit as claimed in claim 1, wherein: a diode D2 is arranged between the resistor R7 and the CHG pin of the multi-section lithium battery management chip U1, the anode of the diode D2 is connected with the CHG pin of the multi-section lithium battery management chip U1, and the cathode of the diode D2 is connected with one end of the resistor R7.
4. The lithium battery protection panel charging self-locking circuit as claimed in claim 1, wherein: a capacitor C1 is arranged between the base electrode of the triode V3 and the cathode B-of the battery pack, one end of the capacitor C1 is connected with the base electrode of the triode V3, and the other end of the capacitor C1 is connected with the cathode B-of the battery pack.
5. The lithium battery protection panel charging self-locking circuit as claimed in claim 1, wherein: the multiple lithium battery management chips U1 adopt multiple lithium battery management chips with the model number of Oz-8952.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020531128.1U CN211720295U (en) | 2020-04-13 | 2020-04-13 | Lithium battery protection board charging self-locking circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020531128.1U CN211720295U (en) | 2020-04-13 | 2020-04-13 | Lithium battery protection board charging self-locking circuit |
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| Publication Number | Publication Date |
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| CN211720295U true CN211720295U (en) | 2020-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020531128.1U Active CN211720295U (en) | 2020-04-13 | 2020-04-13 | Lithium battery protection board charging self-locking circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113629795A (en) * | 2021-06-21 | 2021-11-09 | 东莞市吉瑞达实业有限公司 | Temperature control protection charging circuit |
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2020
- 2020-04-13 CN CN202020531128.1U patent/CN211720295U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113629795A (en) * | 2021-06-21 | 2021-11-09 | 东莞市吉瑞达实业有限公司 | Temperature control protection charging circuit |
| CN113629795B (en) * | 2021-06-21 | 2024-05-07 | 东莞市吉瑞达实业有限公司 | Method for monitoring charging temperature by using temperature control protection charging circuit |
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