Charging loop control system of split-port battery management system

Abstract

The utility model discloses a charging loop control system of a split battery management system, which comprises a battery management chip, a power supply module, a current detection resistor of which one end is connected with the negative electrode of a battery pack, a discharging switch module connected in series to a discharging loop, and a charging switch module and a discharging protection module which are connected in series to a charging loop, the operational amplifier control module is connected with the discharging protection module, the charging loop and the discharging loop are connected in parallel and then connected with the other end of the current detection resistor, and the other end of the current detection resistor is further connected with the operational amplifier control module; therefore, one-way conduction of the charging current is achieved, discharging safety of the split charging loop is effectively guaranteed, the discharging protection effect is achieved, and the advantages of being high in response speed and simple in circuit building are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery management system technical field especially is involved in a kind of charging loop control system of split mouth battery management system. BACKGROUND

[0002] In practical application, charging current and discharging current often exist larger deviation, which proposes higher challenge to battery management. In order to more accurately, efficiently carry out battery management, split mouth design is generally used in the industry. So-called split mouth design, charging and discharging are respectively set different interfaces, so that they are in different loop. This design has significant advantages compared to traditional same mouth design, when same mouth design, charging and discharging switch are connected in series in the same loop, which limits the flexibility and accuracy of battery management to some extent. After split mouth design, charging switch and discharging switch are respectively located in different loop, can more independently control charging and discharging process, to better adapt to the battery management demand under different working conditions, effectively improve the use efficiency and life of battery.

[0003] However, after using split mouth design, the charging loop of battery loses the charging protection provided by discharging switch when same mouth design. SUMMARY

[0004] The utility model aims at overcoming above-mentioned shortcoming, provides a kind of charging loop control system of split mouth battery management system, to realize the unidirectional conduction of charging current, effectively guarantee the discharge safety of split mouth charging loop, reach discharging protection effect, with the characteristics of fast response speed and simple circuit construction.

[0005] To achieve the above object, the specific scheme of the utility model is as follows: a kind of charging loop control system of split mouth battery management system, including battery management chip, power supply module, the current detection resistance connected with the negative pole of battery pack in one end, discharging switch module and charging switch module and discharging protection module connected in series in discharging loop, further including the operational amplifier control module connected with discharging protection module, charging loop and discharging loop are connected after parallel with the other end of current detection resistance, the other end of current detection resistance is also connected with operational amplifier control module.

[0006] The utility model further, the operational amplifier control module includes operational amplifier chip IC1, triode Q1, triode Q2 and triode Q3;

[0007] The reverse input end of the operational amplifier chip IC1 is connected with the other end of the current detection resistor; the same direction input end of the operational amplifier chip IC1 is grounded, the output end of the operational amplifier chip IC1 is connected with the base of the triode Q2, the emitter of the triode Q2 is grounded, the collector of the triode Q2 is connected with the base of the triode Q1, the base of the triode Q1 is also connected with the positive pole of the battery group, the emitter of the triode Q1 is connected with the positive pole of the battery group, the collector of the triode Q1 is connected with the collector of the triode Q3, the base of the triode Q3 is connected with the collector of the triode Q1, the base of the triode Q3 is also grounded, and the emitter of the triode Q3 is connected with the discharge protection module.

[0008] Further, the reverse input end of the operational amplifier chip IC1 is connected with the other end of the current detection resistor after being connected with the resistor R6 in series, and the reverse input end of the operational amplifier chip IC1 is connected with the power supply module after being connected with the resistor R4 in series; the same direction input end of the operational amplifier chip IC1 is grounded after being connected with the resistor R7 in series; the reverse input end and the same direction input end of the operational amplifier chip IC1 are also connected with the capacitor C3 and the capacitor C4 in series respectively and then grounded; the output end of the operational amplifier chip IC1 is connected with the base of the triode Q2 after being connected with the resistor R5 and the diode D2 in series; the base of the triode Q2 is connected with one end of the capacitor C1 and the resistor R9 which are connected in parallel, and the other end of the capacitor C1 and the resistor R9 which are connected in parallel is grounded; the collector of the triode Q2 is connected with the base of the triode Q1 after being connected with the resistor R2 in series, the base of the triode Q1 is connected with the positive pole of the battery group after being connected with the resistor R1 in series; the base of the triode Q3 is connected with the collector of the triode Q1 after being connected with the resistor R3 in series; the base of the triode Q3 is grounded after being connected with the zener diode ZD1 in series; the emitter of the triode Q3 is connected with the discharge protection module after being connected with the resistor R8 in series.

[0009] Further, the discharge protection module comprises the MOS tube M1, the zener diode ZD2 and the resistor R10; the gate of the MOS tube M1 is connected with the emitter of the triode Q3; the source and the drain of the MOS tube M1 are connected in series on the charging circuit, the source of the MOS tube M1 is connected with the current detection resistor, and the drain of the MOS tube M1 is connected with the charging switch module; the zener diode ZD2 and the resistor R1 are arranged in parallel, one end of the zener diode ZD2 and the resistor R1 which are connected in parallel is connected with the gate of the MOS tube M1, and the other end of the zener diode ZD2 and the resistor R1 which are connected in parallel is connected with the source of the MOS tube M1.

[0010] The utility model further, the charging switch module includes MOS pipe MC1, triode Q4 and triode Q5, the source and the drain of MOS pipe MC1 are connected in series on the charging circuit, the source of MOS pipe MC1 is connected with the negative pole of charging circuit, the drain of MOS pipe MC1 is connected with the discharge protection module, the gate of MOS pipe MC1 is connected with the emitter of triode Q4, the emitter of triode Q4 is connected with the base of triode Q5 after being connected with the battery management chip, the collector of triode Q4 is connected with the negative pole of charging circuit, the base of triode Q4 is connected with the emitter of triode Q5, the collector of triode Q5 is connected with the negative pole of charging circuit, and the base of triode Q5 is also connected with the negative pole of charging circuit.

[0011] The utility model further, the gate of MOS pipe MC1 is connected with the emitter of triode Q4 after being connected with resistance R13, the emitter of triode Q4 and the base of triode Q5 are connected with diode D3, the emitter of triode Q4 is connected with the source of MOS pipe MC1 with the parallelly connected voltage stabilizing diode D4 and resistance R14, the collector of triode Q4 is connected with the negative pole of charging circuit after being connected with resistance R12, the base of triode Q5 is connected with the negative pole of charging circuit after being connected with resistance R15, the emitter of triode Q4 and the base of triode Q5 are connected with diode D1 after being connected with the battery management chip.

[0012] The utility model further, the discharge switch module includes MOS pipe MC2, triode Q6 and triode Q7, the source and the drain of MOS pipe MC2 are connected in series on the discharge circuit, the drain of MOS pipe MC1 is connected with the negative pole of discharge circuit, the source of MOS pipe MC1 is connected with the current detection resistance, the gate of MOS pipe MC1 is connected with the emitter of triode Q6, the emitter of triode Q6 is connected with the base of triode Q7 after being connected with the battery management chip, the collector of triode Q6 is connected with the source of MOS pipe MC2, the base of triode Q6 is connected with the emitter of triode Q7, the collector of triode Q7 is connected with the source of MOS pipe MC2, and the base of triode Q7 is also connected with the source of MOS pipe MC2.

[0013] The utility model further, the gate of MOS pipe MC2 is connected with the emitter of triode Q6 after being connected with resistance R17, the emitter of triode Q6 and the base of triode Q7 are connected with diode D6, the emitter of triode Q6 is connected with the source of MOS pipe MC2 with the parallelly connected voltage stabilizing diode D7 and resistance R19, the collector of triode Q6 is connected with the source of MOS pipe MC2 after being connected with resistance R16, the base of triode Q7 is connected with the source of MOS pipe MC2 after being connected with resistance R18, the emitter of triode Q6 and the base of triode Q7 are connected with diode D5 after being connected with the battery management chip.

[0014] The utility model further, the power supply module includes diode D9, resistance R21, resistance R22, triode Q8, voltage stabilizing diode ZD4, diode D8, capacitor C5 and voltage stabilizing diode ZD3;

[0015] The anode of diode D9 is connected with the anode of battery group, one end of resistance R21 is connected with the cathode of diode D9, the collector of triode Q8 is connected with the other end of resistance R21, one end of resistance R22 is connected with the collector of triode Q8, one end of voltage stabilizing diode ZD4 is connected with the other end of resistance R22 and the base of triode Q8, the anode of diode D8 is connected with the emitter of triode Q8, one end of capacitor C5 and voltage stabilizing diode ZD3 in parallel is connected with the cathode of diode D8, and the other end of capacitor C5 and voltage stabilizing diode ZD3 in parallel also leads out VSYS power supply node;The other end of capacitor C5 and voltage stabilizing diode ZD3 in parallel is connected with the other end of voltage stabilizing diode ZD4 and then grounded.

[0016] The utility model has the advantages that: the utility model passes through setting and discharging protection module on -off according to the charging current size of current detection resistance of operational amplifier control module, thereby realizes the unidirectional conduction of charging current, effectively guarantees the discharge safety of branch charging loop, reaches the discharge protection effect, has the characteristics such as fast response and simple circuit construction. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the structural schematic diagram block diagram provided by the embodiment of the application;

[0018] Figure 2 It is the circuit schematic diagram provided by the embodiment of the application;

[0019] Figure 3 It is the partial schematic diagram of battery management chip provided by the embodiment of the application;

[0020] Figure 4 It is the circuit schematic diagram of power supply module provided by the embodiment of the application;

[0021] Figure 5 It is the circuit schematic diagram of discharge protection module provided by the embodiment of the application;

[0022] Figure 6 It is the circuit schematic diagram of operational amplifier control module provided by the embodiment of the application;

[0023] Figure 7 It is the circuit schematic diagram of charging switch module provided by the embodiment of the application;

[0024] Figure 8 It is the circuit schematic diagram of discharge switch module provided by the embodiment of the application;

[0025] Explanation of reference numerals in the attached diagram: a1, Battery management chip; a2, Power supply module; a3, Current sensing resistor; a4, Discharge switch module; a5, Charging switch module; a6, Discharge protection module; a7, Operational amplifier control module. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this is not to limit the scope of the present invention.

[0027] like Figures 1 to 8 As shown in this embodiment, the charging circuit control system of a split-port battery management system includes a battery management chip a1, a power supply module a2, a current detection resistor a3 connected to the negative terminal of the battery pack at one end, a discharge switch module a4 connected in series in the discharge circuit, and a charging switch module a5 and a discharge protection module a6 connected in series in the charging circuit. It also includes an operational amplifier control module a7 connected to the discharge protection module a6. The charging circuit and the discharge circuit are connected in parallel and then connected to the other end of the current detection resistor a3. The other end of the current detection resistor a3 is also connected to the operational amplifier control module a7.

[0028] Specifically, power supply module a2 converts the battery pack voltage into the operating voltage required by the control system. Current detection resistor a3 is resistor R20. When the battery pack needs charging, the charging circuit is used. Battery management chip a1 controls charging switch module a5 to open. Operational amplifier control module a7 collects the charging current of resistor R20 and amplifies it. When the charging current is greater than threshold A, operational amplifier control module a7 outputs a high level to discharge protection module a6, and discharge protection module a6 is turned on. When the charging current is less than threshold A, operational amplifier control module a7 outputs a low level to discharge protection module a6, and discharge protection module a6 is turned off. That is, no discharge is performed through the charging circuit at this time. When the battery pack needs to discharge, the discharge circuit is used. Battery management chip a1 controls discharge switch module a4 to open, thereby providing power to the outside.

[0029] In this embodiment, the operational amplifier control module a7 controls the on / off state of the discharge protection module a6 based on the charging current of the current detection resistor a3, thereby achieving unidirectional conduction of the charging current, effectively ensuring the discharge safety of the charging circuit and achieving the discharge protection effect. It features fast response speed and simple circuit construction.

[0030] In this embodiment, as Figure 3As shown, the battery management chip a1 is a chip IC2, and the VDD pin of the chip IC2 is connected with the power supply module a2 in series with a resistor R11; the DSG pin of the chip IC2 is connected with the discharging switch module a4, and the CHG pin of the chip IC2 is connected with the charging switch module a5; and the VSS pin of the chip IC2 is grounded. It should be noted that the specific model of the chip IC2 is not limited, as long as it can meet the charging and discharging control of the battery pack, for example, the chip with the model HC32L072KATA.

[0031] As shown in FIG. 1, the charging circuit control system of the embodiment includes a battery pack a, a battery management chip a1, a current detection resistor a3, a power supply module a2, a discharging switch module a4, a charging switch module a5, a discharging protection module a6, and a charge loop control system a7. Figure 2 As shown in FIG. 1, the charging circuit control system of the embodiment includes a battery pack a, a battery management chip a1, a current detection resistor a3, a power supply module a2, a discharging switch module a4, a charging switch module a5, a discharging protection module a6, and a charge loop control system a7. Figure 6 As shown in FIG. 1, the charging circuit control system of the embodiment includes a battery pack a, a battery management chip a1, a current detection resistor a3, a power supply module a2, a discharging switch module a4, a charging switch module a5, a discharging protection module a6, and a charge loop control system a7. Figure 6 As shown in FIG. 1, the charging circuit control system of the embodiment includes a battery pack a, a battery management chip a1, a current detection resistor a3, a power supply module a2, a discharging switch module a4, a charging switch module a5, a discharging protection module a6, and a charge loop control system a7. As shown in FIG. 1, the charging circuit control system of the embodiment includes a battery pack a, a battery management chip a1, a current detection resistor a3, a power supply module a2, a discharging switch module a4, a charging switch module a5, a discharging protection module a6, and a charge loop control system a7.

[0032] Specifically, the resistor R20 inputs a signal to the inverting input terminal of the operational amplifier chip IC1, and after the signal is amplified by the operational amplifier chip IC1, the output terminal of the operational amplifier chip IC1 outputs a level signal to the base of the transistor Q2. When the output terminal of the operational amplifier chip IC1 outputs a high level, the transistor Q2 is turned on, and the voltage signal of the positive pole P+ of the battery pack is loaded on the discharge protection module a6 through the transistor Q3, so as to drive the discharge protection module a6 to open. When the output terminal of the operational amplifier chip IC1 outputs a low level, the transistor Q2 and the transistor Q3 are turned off, and at this time, the voltage signal of the positive pole P+ of the battery pack cannot be loaded on the discharge protection module a6 through the transistor Q3, so as to make the discharge protection module a6 turn off, thereby protecting the discharge of the charging circuit, and achieving the discharge protection effect.

[0033] As shown in Figure 2 and Figure 5 , the charging circuit control system of the embodiment includes a MOS tube M1, a voltage stabilizing diode ZD2 and a resistor R10. The gate of the MOS tube M1 is connected with the emitter of the transistor Q3. The source and the drain of the MOS tube M1 are connected in series on the charging circuit, and the source of the MOS tube M1 is connected with the current detection resistor a3, and the drain of the MOS tube M1 is connected with the charging switch module a5. The voltage stabilizing diode ZD2 and the resistor R1 are connected in parallel, one end of the voltage stabilizing diode ZD2 and the resistor R1 connected in parallel is connected with the gate of the MOS tube M1, and the other end of the voltage stabilizing diode ZD2 and the resistor R1 connected in parallel is connected with the source of the MOS tube M1.

[0034] Specifically, when the output terminal of the operational amplifier chip IC1 outputs a high level, the transistor Q2 is turned on, and the voltage signal of the positive pole P+ of the battery pack is loaded on the gate of the MOS tube M1 through the transistor Q3, so as to drive the MOS tube M1 to turn on, so as to realize the charging of the battery pack. When the output terminal of the operational amplifier chip IC1 outputs a low level, the transistor Q2 and the transistor Q3 are turned off, so as to drive the MOS tube M1 to turn off, thereby preventing the battery pack from discharging through the charging circuit, so as to realize the discharge safety of the charging circuit.

[0035] As shown in Figure 2 and Figure 7As shown, the charging circuit control system of the embodiment, in some embodiments, the charging switch module a5 includes MOS tube MC1, triode Q4 and triode Q5; the source and drain of MOS tube MC1 are connected in series on the charging circuit, the source of MOS tube MC1 is connected with the negative pole of the charging circuit, the drain of MOS tube MC1 is connected with the discharge protection module a6, the gate of MOS tube MC1 is connected with the emitter of triode Q4, the emitter of triode Q4 is connected with the base of triode Q5 and then connected with the battery management chip a1; the collector of triode Q4 is connected with the negative pole of the charging circuit, the base of triode Q4 is connected with the emitter of triode Q5, the collector of triode Q5 is connected with the negative pole of the charging circuit, and the base of triode Q5 is also connected with the negative pole of the charging circuit. Further, as shown Figure 7 As shown, the gate of MOS tube MC1 is connected with the emitter of triode Q4 in series with resistance R13, the emitter of triode Q4 and the base of triode Q5 are connected with diode D3, the emitter of triode Q4 is connected with the source of MOS tube MC1 with voltage stabilizing diode D4 and resistance R14 arranged in parallel, the collector of triode Q4 is connected with the negative pole of the charging circuit in series with resistance R12, the base of triode Q5 is connected with the negative pole of the charging circuit in series with resistance R15, and the emitter of triode Q4 and the base of triode Q5 are connected with the battery management chip a1 in series with diode D1.

[0036] Specifically, the emitter of triode Q4 and the base of triode Q5 are connected with the CHG pin of chip IC2 in series with diode D1, so that a driving signal is output to the gate of MOS tube MC1 through the CHG pin of chip IC2 during charging, MOS tube MC1 is turned on, and the battery pack is charged through the charging circuit; during discharging, MOS tube M1 is turned off, thereby preventing external discharge through the charging circuit when the battery pack is discharging.

[0037] As shown in Figure 2 and Figure 8 As shown, the charging circuit control system of the embodiment, in some embodiments, the discharge switch module a4 includes MOS tube MC2, triode Q6 and triode Q7; the source and drain of MOS tube MC2 are connected in series on the discharging circuit, the drain of MOS tube MC1 is connected with the negative pole of the discharging circuit, the source of MOS tube MC1 is connected with current detection resistance a3, the gate of MOS tube MC1 is connected with the emitter of triode Q6, the emitter of triode Q6 is connected with the base of triode Q7 and then connected with the battery management chip a1; the collector of triode Q6 is connected with the source of MOS tube MC2, the base of triode Q6 is connected with the emitter of triode Q7, the collector of triode Q7 is connected with the source of MOS tube MC2, and the base of triode Q7 is also connected with the source of MOS tube MC2. Further, as shown Figure 8As shown, the gate of the MOS tube MC2 is connected with the emitter of the transistor Q6 in series with the resistance R17, the emitter of the transistor Q6 is connected with the base of the transistor Q7 in series with the diode D6, the emitter of the transistor Q6 is connected with the source of the MOS tube MC2 in series with the zener diode D7 and the resistance R19 arranged in parallel, the collector of the transistor Q6 is connected with the source of the MOS tube MC2 in series with the resistance R16, the base of the transistor Q7 is connected with the source of the MOS tube MC2 in series with the resistance R18, the emitter of the transistor Q6 is connected with the battery management chip a1 in series with the diode D5 and the base of the transistor Q7.

[0038] Specifically, the emitter of the transistor Q6 is connected with the base of the transistor Q7 in series with the diode D5 and the DSG pin of the chip IC2; when discharging is needed, the DSG pin of the chip IC2 outputs a driving signal to the gate of the MOS tube MC2, so that the MOS tube MC2 is turned on, thereby discharging externally through the discharging circuit.

[0039] As shown in Figure 2 and Figure 4 As shown in the charging circuit control system of the embodiment, in some embodiments, the power supply module a2 comprises a diode D9, a resistance R21, a resistance R22, a transistor Q8, a zener diode ZD4, a diode D8, a capacitor C5 and a zener diode ZD3; the positive electrode of the diode D9 is connected with the positive electrode of the battery pack, one end of the resistance R21 is connected with the negative electrode of the diode D9, the collector of the transistor Q8 is connected with the other end of the resistance R21, one end of the resistance R22 is connected with the collector of the transistor Q8, one end of the zener diode ZD4 is connected with the other end of the resistance R22 and the base of the transistor Q8, the positive electrode of the diode D8 is connected with the emitter of the transistor Q8, one end of the capacitor C5 and the zener diode ZD3 arranged in parallel is connected with the negative electrode of the diode D8, and the other end of the capacitor C5 and the zener diode ZD3 arranged in parallel is connected with the other end of the zener diode ZD4 and then grounded.

[0040] Specifically, the VDD pin of the chip IC2 is connected with the VSYS power supply node in series with the resistance R11, and the inverting input end of the operational amplifier chip IC1 is connected with the VSYS power supply node in series with the resistance R4, so that the required working voltage is provided for the chip IC2 and the chip IC1 through the above arrangement.

[0041] The above only describes the preferred embodiment of the utility model, and equivalent changes or modifications made according to the structure, features and principles described in the utility model patent application scope are included in the protection scope of the utility model patent application.

Claims

1. A charging circuit control system for a split-port battery management system, characterized in that, It includes a battery management chip, a power supply module, a current sensing resistor connected to the negative terminal of the battery pack at one end, a discharge switch module connected in series in the discharge circuit, a charging switch module and a discharge protection module connected in series in the charging circuit, and an operational amplifier control module connected to the discharge protection module. The charging circuit and the discharge circuit are connected in parallel and then connected to the other end of the current sensing resistor. The other end of the current sensing resistor is also connected to the operational amplifier control module.

2. The charging circuit control system of a split-port battery management system according to claim 1, characterized in that, The operational amplifier control module includes operational amplifier chip IC1, transistor Q1, transistor Q2, and transistor Q3; The inverting input terminal of operational amplifier chip IC1 is connected to the other end of the current sensing resistor; the non-inverting input terminal of operational amplifier chip IC1 is grounded; the output terminal of operational amplifier chip IC1 is connected to the base of transistor Q2; the emitter of transistor Q2 is grounded; the collector of transistor Q2 is connected to the base of transistor Q1; the base of transistor Q1 is also connected to the positive terminal of the battery pack; the emitter of transistor Q1 is connected to the positive terminal of the battery pack; the collector of transistor Q1 is connected to the collector of transistor Q3; the base of transistor Q3 is connected to the collector of transistor Q1; the base of transistor Q3 is also grounded; and the emitter of transistor Q3 is connected to the discharge protection module.

3. The charging circuit control system of a split-port battery management system according to claim 2, characterized in that, The inverting input terminal of the operational amplifier chip IC1 is connected in series with resistor R6 and then to the other end of the current sensing resistor. The inverting input terminal of the operational amplifier chip IC1 is also connected in series with resistor R4 and then to the power supply module. The non-inverting input terminal of the operational amplifier chip IC1 is connected in series with resistor R7 and then grounded. Capacitors C3 and C4 are also connected in series with the inverting and non-inverting input terminals of the operational amplifier chip IC1 and then grounded, respectively. The output terminal of the operational amplifier chip IC1 is connected in series with resistor R5 and diode D2 and then to the base of transistor Q2. The transistor Q2... One end of the base of transistor Q2 is connected in parallel with capacitor C1 and resistor R9, and the other end of the parallel connection of capacitor C1 and resistor R9 is grounded; the collector of transistor Q2 is connected to the base of transistor Q1 after series with resistor R2, and the base of transistor Q1 is connected to the positive terminal of the battery pack after series with resistor R1; the base of transistor Q3 is connected to the collector of transistor Q1 after series with resistor R3; the base of transistor Q3 is connected to the ground after series with Zener diode ZD1; the emitter of transistor Q3 is connected to the discharge protection module after series with resistor R8.

4. The charging circuit control system of a split-port battery management system according to claim 2, characterized in that, The discharge protection module includes a MOSFET M1, a Zener diode ZD2, and a resistor R10. The gate of the MOSFET M1 is connected to the emitter of the transistor Q3. The source and drain of the MOSFET M1 are connected in series in the charging circuit, and the source of the MOSFET M1 is connected to the current sensing resistor, while the drain of the MOSFET M1 is connected to the charging switch module. The Zener diode ZD2 and the resistor R1 are connected in parallel. One end of the parallel connection of the Zener diode ZD2 and the resistor R1 is connected to the gate of the MOSFET M1, and the other end of the parallel connection is connected to the source of the MOSFET M1.

5. The charging circuit control system of a split-port battery management system according to claim 1, characterized in that, The charging switch module includes a MOSFET MC1, a transistor Q4, and a transistor Q5. The source and drain of MOSFET MC1 are connected in series in the charging circuit. The source of MOSFET MC1 is connected to the negative terminal of the charging circuit, and the drain of MOSFET MC1 is connected to the discharge protection module. The gate of MOSFET MC1 is connected to the emitter of transistor Q4. The emitter of transistor Q4 is connected to the base of transistor Q5 and then connected to the battery management chip. The collector of transistor Q4 is connected to the negative terminal of the charging circuit, the base of transistor Q4 is connected to the emitter of transistor Q5, the collector of transistor Q5 is connected to the negative terminal of the charging circuit, and the base of transistor Q5 is also connected to the negative terminal of the charging circuit.

6. The charging circuit control system of a split-port battery management system according to claim 5, characterized in that, The gate of the MOSFET MC1 is connected to the emitter of the transistor Q4 via a series resistor R13. The emitter of transistor Q4 and the base of transistor Q5 are connected to a diode D3. The emitter of transistor Q4 and the source of MOSFET MC1 are connected in parallel with a Zener diode D4 and a resistor R14. The collector of transistor Q4 is connected to the negative terminal of the charging circuit via a series resistor R12. The base of transistor Q5 is connected to the negative terminal of the charging circuit via a series resistor R15. The emitter of transistor Q4 and the base of transistor Q5 are connected to the battery management chip via a series diode D1.

7. The charging circuit control system of a split-port battery management system according to claim 1, characterized in that, The discharge switch module includes a MOSFET MC2, a transistor Q6, and a transistor Q7. The source and drain of MOSFET MC2 are connected in series in the discharge circuit. The drain of MOSFET MC1 is connected to the negative terminal of the discharge circuit. The source of MOSFET MC1 is connected to the current sensing resistor. The gate of MOSFET MC1 is connected to the emitter of transistor Q6. The emitter of transistor Q6 is connected to the base of transistor Q7 and then connected to the battery management chip. The collector of transistor Q6 is connected to the source of MOSFET MC2. The base of transistor Q6 is connected to the emitter of transistor Q7. The collector of transistor Q7 is connected to the source of MOSFET MC2. The base of transistor Q7 is also connected to the source of MOSFET MC2.

8. The charging circuit control system of a split-port battery management system according to claim 7, characterized in that, The gate of MOSFET MC2 is connected to the emitter of transistor Q6 via a series resistor R17. A diode D6 is connected to the emitter of transistor Q6 and the base of transistor Q7. A Zener diode D7 and a resistor R19 are connected in parallel between the emitter of transistor Q6 and the source of MOSFET MC2. The collector of transistor Q6 is connected to the source of MOSFET MC2 via a series resistor R16. The base of transistor Q7 is connected to the source of MOSFET MC2 via a series resistor R18. The emitter of transistor Q6 and the base of transistor Q7 are connected to the battery management chip via a series diode D5.

9. The charging circuit control system of a split-port battery management system according to claim 1, characterized in that, The power supply module includes diode D9, resistor R21, resistor R22, transistor Q8, Zener diode ZD4, diode D8, capacitor C5, and Zener diode ZD3; The anode of diode D9 is connected to the positive terminal of the battery pack. One end of resistor R21 is connected to the cathode of diode D9. The collector of transistor Q8 is connected to the other end of resistor R21. One end of resistor R22 is connected to the collector of transistor Q8. One end of Zener diode ZD4 is connected to the other end of resistor R22 and the base of transistor Q8. The anode of diode D8 is connected to the emitter of transistor Q8. One end of capacitor C5 and Zener diode ZD3 connected in parallel is connected to the cathode of diode D8. One end of capacitor C5 and Zener diode ZD3 connected in parallel is also led out to the VSYS power supply node. The other end of capacitor C5 and Zener diode ZD3 connected in parallel is connected to the other end of Zener diode ZD4 and then grounded.

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