Lithium battery charging and discharging port distinguishing and identifying circuit

Abstract

The utility model provides a lithium battery charge and discharge port distinguishing and identifying circuit, which comprises a lithium battery BMS, a charger and a load, the B + interface of the charger is connected to the B + interface of the lithium battery BMS, the B + interface of the lithium battery BMS returns to the GND of the charger through a resistor R11 and the A11 interface of TYPEC, the B + interface of the load is connected to the B + interface of the lithium battery BMS, the P-interface of the load is connected to the P-interface of the lithium battery BMS, and the B + interface of the lithium battery BMS returns to the GND of the charger through the resistor R11 and the A11 interface of the TYPEC. The circuit can thoroughly solve a series of safety accidents caused by wrong insertion of the charging and discharging interface, for example, a charger is inserted into the discharging port to explode a battery, and an unmatched mobile phone is randomly inserted into the discharging port to damage the mobile phone.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a lithium battery charging and discharging port distinguishing and identifying circuit. Background Art

[0002] There is a kind of lightweight kettle-type lithium battery on the market. When it needs to be charged and discharged, many customers use the typec interface to charge and discharge the lithium battery.

[0003] The current solution basically does not have mutual recognition between the charging and discharging ports, and basically charges and discharges directly by plugging in, which poses a safety hazard. Utility Model Content

[0004] In order to make up for the deficiencies of the prior art, the embodiments of the present application solve the problems in the prior art by providing a lithium battery charging and discharging port identification circuit.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A lithium battery charging and discharging port distinguishing and identifying circuit comprises a lithium battery BMS, a charger and a load, wherein a B+ interface of the charger is connected to a B+ interface of the lithium battery BMS, the B+ interface of the lithium battery BMS passes through a resistor R11 and an A11 interface of a TYPEC and returns to a GND of the charger, a B+ interface of the load is connected to a B+ interface of the lithium battery BMS, a P- interface of the load is connected to a P- interface of the lithium battery BMS, the P- interface of the lithium battery BMS is also connected to a drain of a MOS tube M3, a source of the MOS tube M3 is connected to a resistor R9, the other end of the resistor R9 is connected to a resistor R8, the other end of the resistor R8 is connected to an A5 interface of the lithium battery BMS, and an A12 interface of the charger is connected to a MOS tube M4.

[0007] As a further technical solution of the present utility model: the MOS tube M3 is an N-MOS tube.

[0008] As a further technical solution of the present utility model: the MOS tube M4 is an N-MOS tube.

[0009] As a further technical solution of the present invention: the lithium battery BMS includes two TYPE-C interfaces.

[0010] As a further technical solution of the utility model: the charger and the load both include a TYPE-C interface.

[0011] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0012] This circuit can completely solve a series of safety accidents caused by incorrect insertion of the charging and discharging interface, such as plugging the charger into the discharge port to charge the battery and explode it, and plugging an incompatible mobile phone into the discharge port to damage the mobile phone. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a circuit diagram of the utility model. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0015] Reference Figure 1 A lithium battery charging and discharging port distinguishing and identifying circuit includes a lithium battery BMS, a charger and a load, wherein the B+ interface of the charger is connected to the B+ interface of the lithium battery BMS, the B+ interface of the lithium battery BMS passes through a resistor R11 and an A11 interface of a TYPEC and returns to the GND of the charger, the B+ interface of the load is connected to the B+ interface of the lithium battery BMS, the P- interface of the load is connected to the P- interface of the lithium battery BMS, the P- interface of the lithium battery BMS is also connected to the drain of a MOS tube M3, the source of the MOS tube M3 is connected to a resistor R9, the other end of the resistor R9 is connected to a resistor R8, the other end of the resistor R8 is connected to the A5 interface of the lithium battery BMS, and the A12 interface of the charger is connected to a MOS tube M4.

[0016] MOS tube M3 is an N-MOS tube. MOS tube M4 is an N-MOS tube. The lithium battery BMS includes two TYPE-C interfaces. The charger and the load each include a TYPE-C interface.

[0017] Here’s how it works:

[0018] First, when discharge is required, the load is inserted into the lithium battery BMS, that is, the TYPEC interface is plugged in. At this time, the discharge port of the lithium battery BMS will not output voltage. Identification detection is performed first. At this time, the B+ of the lithium battery BMS enters the load B+ through R10, B2 interface, R8, R9, B- to form a loop. The lithium battery BMS detects the voltage division of DSG_ID to determine the connected load, and then drives to open the discharge MOS-M3 for discharge.

[0019] When charging is needed, the charger is inserted into the lithium battery BMS. At this time, there will be no voltage at the output port of the charger. The charging port will be identified first. The B+ of the charger is connected to the B+ of the BMS, and then returns to the GND of the charger through R11 and the A11 interface of TYPEC to form a loop. The charger end performs voltage division detection, and then determines that the charging port of the lithium battery BMS has been correctly inserted. At this time, the MOS tube M4 is driven to open, the output voltage, and the lithium battery BMS is charged.

[0020] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0021] In addition, it should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment have also been appropriately combined to form other implementation modes that are easy for those skilled in the art to understand.

Claims

1. A lithium battery charging and discharging port identification circuit, including a lithium battery BMS, a charger and a load, characterized in that: The B+ interface of the charger is connected to the B+ interface of the lithium battery BMS, and the B+ interface of the lithium battery BMS passes through the resistor R11 and the A11 interface of TYPEC and returns to the GND of the charger. The B+ interface of the load is connected to the B+ interface of the lithium battery BMS, and the P- interface of the load is connected to the P- interface of the lithium battery BMS. The P- interface of the lithium battery BMS is also connected to the drain of the MOS tube M3, and the source of the MOS tube M3 is connected to the resistor R9, and the other end of the resistor R9 is connected to the resistor R8, and the other end of the resistor R8 is connected to the A5 interface of the lithium battery BMS, and the A12 interface of the charger is connected to the MOS tube M4.

2. A lithium battery charge and discharge port identification circuit according to claim 1, characterized in that: The MOS tube M3 is an N-MOS tube.

3. A lithium battery charge and discharge port identification circuit according to claim 1, characterized in that: The MOS tube M4 is an N-MOS tube.

4. A lithium battery charge and discharge port identification circuit according to claim 1, characterized in that: The lithium battery BMS includes two TYPE-C interfaces.

5. A lithium battery charge and discharge port identification circuit according to claim 4, characterized in that: The charger and the load both include a TYPE-C interface.

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