A circuit for preventing arcing during battery pack discharge.

Abstract

This utility model relates to the field of battery pack circuit technology and discloses a circuit for preventing arcing during battery pack discharge, including an MCU chip U6 and an analog front-end chip U4; a discharge arcing prevention control circuit connected to the MCU chip U6 and the analog front-end chip U4; a charging acceleration and shutdown module connected to the discharge arcing prevention control circuit; a voltage input and balancing module and a power supply module connected to the analog front-end chip U4; through the coordinated control of the MCU chip U6 and the analog front-end chip U4, real-time monitoring of battery voltage, status and discharge process is achieved, and the discharge arcing prevention control circuit performs precise power adjustment; at the same time, the charging acceleration and shutdown module can quickly cut off the circuit when abnormal current or voltage is detected to avoid the risk of arcing; in addition, the voltage input and balancing module ensures the voltage consistency between cells, and the power supply module provides a reliable power supply for stable system operation, thus forming a safe, efficient and fast-responding battery pack discharge arcing prevention protection circuit.

Description

Technical Field

[0001] This utility model relates to the field of battery pack circuit technology, and specifically to a circuit for preventing arcing during battery pack discharge. Background Technology

[0002] Currently, lithium batteries are frequently used in the battery swapping field. When a lithium battery is plugged into an electric vehicle, it charges the controller capacitor, causing the power cord contact pieces to spark and turn black. After repeated use, the contact resistance increases. During use, the high current generates heat, resulting in very high temperatures that can melt the power cord socket and even cause a fire. The technical problem to be solved by this utility model is to provide a circuit for preventing arcing during battery pack discharge. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a circuit for preventing arcing during battery pack discharge.

[0004] A circuit for preventing arcing during battery discharge includes an MCU chip U6 and an analog front-end chip U4; an arcing prevention control circuit connected to the MCU chip U6 and the analog front-end chip U4; a charging acceleration and shutdown module connected to the arcing prevention control circuit; and a voltage input and equalization module and a power supply module connected to the analog front-end chip U4.

[0005] Preferably, the discharge anti-sparking control circuit includes a MOSFET QC1; the gate of MOSFET QC1 is connected to a capacitor Ca1, a diode Dc1, a resistor Rc2, and a resistor Rc1; the other end of resistor Rc1 is connected to MOSFETs Q40, Q50, Q56, Q64, a resistor R183, a diode D17, a MOSFET Q39, a MOSFET Q45, a MOSFET Q52, a MOSFET Q61, a diode D59, and a diode D60; diode D... The other end of 17 is connected to diode D51; the other end of diode D51 is connected to resistor R169; the gate of MOSFET Q39 is connected to resistor R184; the gate of MOSFET Q45 is connected to resistor R200; the gate of MOSFET Q52 is connected to resistor R213; the gate of MOSFET Q61 is connected to resistor R231; the source of MOSFET Q39 is connected to diode D56 and resistor R189; the other end of diode D56 is connected to diode D53 and resistor R172.

[0006] Preferably, the charging acceleration and shutdown module includes a transistor Q43; the emitter of transistor Q43 is connected to a transistor Q15; the emitter of transistor Q15 is connected to a resistor R50 and a capacitor C20; the other end of resistor R50 is connected to a diode D21; the base of transistor Q43 is connected to resistors R38 and R48; the other end of resistor R38 is connected to a diode D20.

[0007] Preferably, the power supply module includes a voltage regulator chip U1; the VIN pin of the voltage regulator chip U1 is connected to a resistor R45 and a capacitor C34; the OUT pin of the voltage regulator chip U1 is connected to a diode D5; the other end of the diode D5 is connected to a capacitor C32; the other end of the resistor R45 is connected to a diode D9; the other end of the diode D9 is connected to capacitors C43, C41, and C40; diode D10, inductor L6, and resistor R155; the other end of the inductor is connected to the VSW pin of the analog front-end chip U4; the VDC pin of the analog front-end chip U4 is connected to a capacitor C30, a diode D4, a capacitor C28, and a diode D2; the other end of the diode D2 is connected to a resistor R28; the VCC pin of the analog front-end chip U4 is connected to a capacitor C37, a diode D7, a capacitor C35, and a diode D6; the other end of the diode D6 is connected to a resistor R36; the VBAT pin of the analog front-end chip U4 is connected to a capacitor C29, a diode D1, a capacitor C26, and a resistor R26.

[0008] Preferably, the voltage input and equalization module includes connector socket P1 and connector socket P2; and each of connector socket P1 and connector socket P2 is connected to several equalization modules; and the equalization module includes transistor Q2; the collector of transistor Q2 is connected to resistor R2; the base of transistor Q2 is connected to resistor R3; the emitter and base of transistor Q2 are connected to resistor R4; and a capacitor C8 is connected between resistor R1 and resistor R4.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: The circuit for preventing arcing during battery pack discharge, through the coordinated control of MCU chip U6 and analog front-end chip U4, realizes real-time monitoring of battery voltage, status and discharge process, and the discharge arcing prevention control circuit performs precise power regulation; at the same time, it is equipped with charging acceleration and shutdown modules, which can quickly cut off the circuit when abnormal current or voltage is detected to avoid the risk of arcing; in addition, the voltage input and equalization modules ensure the voltage consistency between cells, and the power supply module provides a reliable power supply for stable system operation, thus forming a safe, efficient and fast-responding battery pack discharge arcing prevention protection circuit.

[0010] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a partial circuit diagram of this utility model.

[0013] Figure 2 This is another partial circuit diagram of this utility model.

[0014] Figure 3 This is a schematic diagram of the MCU chip circuit of this utility model.

[0015] Figure 4 This is a circuit diagram of the power supply module of this utility model.

[0016] Figure 5 This is a schematic diagram of the charging acceleration and shutdown module circuit of this utility model.

[0017] Figure 6 This is a schematic diagram of the discharge anti-arc control circuit of this utility model. Detailed Implementation

[0018] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] It should be noted that the terms "first," "second," etc., used in this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. The implementation methods described in the following exemplary embodiments do not represent all implementation methods consistent with this disclosure.

[0020] Please see Figures 1-6In this embodiment of the utility model, a circuit for preventing arcing during battery discharge includes an MCU chip U6 and an analog front-end chip U4; an anti-arc discharge control circuit connected to the MCU chip U6 and the analog front-end chip U4; a charging acceleration and shutdown module connected to the anti-arc discharge control circuit; and a voltage input and equalization module and a power supply module connected to the analog front-end chip U4.

[0021] Specifically, through the coordinated control of MCU chip U6 and analog front-end chip U4, real-time monitoring of battery voltage, status, and discharge process is achieved, and precise power regulation is performed by the discharge anti-sparking control circuit. Simultaneously, charging acceleration and shutdown modules are configured to quickly cut off the circuit upon detecting abnormal current or voltage, avoiding the risk of sparking. Furthermore, voltage input and balancing modules ensure voltage consistency between battery cells, and the power supply module provides reliable power for stable system operation, thus forming a safe, efficient, and fast-responding battery pack discharge anti-sparking protection circuit. The analog front-end chip U4 can be an AMG8824A; the MCU chip can be an N32G435x8 / xB.

[0022] Furthermore, the discharge anti-sparking control circuit includes MOSFET QC1; the gate of MOSFET QC1 is connected to capacitor Ca1, diode Dc1, resistor Rc2, and resistor Rc1; the other end of resistor Rc1 is connected to MOSFETs Q40, Q50, Q56, Q64, resistor R183, diode D17, MOSFET Q39, Q45, Q52, Q61, diode D59, and diode D60; diode D... The other end of 17 is connected to diode D51; the other end of diode D51 is connected to resistor R169; the gate of MOSFET Q39 is connected to resistor R184; the gate of MOSFET Q45 is connected to resistor R200; the gate of MOSFET Q52 is connected to resistor R213; the gate of MOSFET Q61 is connected to resistor R231; the source of MOSFET Q39 is connected to diode D56 and resistor R189; the other end of diode D56 is connected to diode D53 and resistor R172.

[0023] Furthermore, the charging acceleration and shutdown module includes a transistor Q43; the emitter of transistor Q43 is connected to transistor Q15; the emitter of transistor Q15 is connected to resistor R50 and capacitor C20; the other end of resistor R50 is connected to diode D21; the base of transistor Q43 is connected to resistors R38 and R48; the other end of resistor R38 is connected to diode D20.

[0024] Furthermore, the power supply module includes a voltage regulator chip U1; the VIN pin of the voltage regulator chip U1 is connected to a resistor R45 and a capacitor C34; the OUT pin of the voltage regulator chip U1 is connected to a diode D5; the other end of the diode D5 is connected to a capacitor C32; the other end of the resistor R45 is connected to a diode D9; the other end of the diode D9 is connected to capacitors C43, C41, and C40; diode D10, inductor L6, and resistor R155; the other end of the inductor is connected to the VSW pin of the analog front-end chip U4; the VDC pin of the analog front-end chip U4 is connected to a capacitor C30, a diode D4, a capacitor C28, and a diode D2; the other end of the diode D2 is connected to a resistor R28; the VCC pin of the analog front-end chip U4 is connected to a capacitor C37, a diode D7, a capacitor C35, and a diode D6; the other end of the diode D6 is connected to a resistor R36; the VBAT pin of the analog front-end chip U4 is connected to a capacitor C29, a diode D1, a capacitor C26, and a resistor R26.

[0025] Furthermore, the voltage input and equalization module includes connector socket P1 and connector socket P2; and each of connector socket P1 and connector socket P2 is connected to several equalization modules; and the equalization module includes transistor Q2; the collector of transistor Q2 is connected to resistor R2; the base of transistor Q2 is connected to resistor R3; the emitter and base of transistor Q2 are connected to resistor R4; and a capacitor C8 is connected between resistor R1 and resistor R4.

[0026] During battery charging, the MCU chip U6 communicates and hands with the external charger through pins 485RX and 485TX. The MCU chip U6 then knows that the battery is charging and recognizes that the charger is connected. Alternatively, it can detect the charging current through the RSN pin of the analog front-end chip U4 to recognize that the charger is connected. When the charger is removed, the communication between the MCU chip U6's pins 485RX and 485TX and the external charger is disconnected, indicating that the charger has been removed. At this time, the MCU chip U6 sends a command through the communication pins MSCL and MSDA to the analog front-end chip U4 to turn off the DSG pin, turning off the discharge MOSFETs Q39, Q45, Q52, and Q61, preventing the battery pack from discharging.

[0027] When a non-discharging battery pack is plugged into an electric vehicle, there is no voltage output, and the connection terminals will not spark. Simultaneously, the battery's B+ voltage passes through the electric vehicle controller circuit, then through charging MOSFETs Q40, Q50, Q56, and Q64, or through the internal parasitic diodes of the charging MOSFETs, and finally through the voltage divider Rc1 and Rc2 to drive Qc1 to conduct. Qc1 is pulled down by Rc3, causing the voltage at pin P12 of the MCU chip U6 to go low. This low level indicates that a load has been connected. At this time, the MCU chip U6 sends a command to the analog front-end chip U4 via communication pins MSCL and MSDA to enable the DSG pin and output the drive voltage. This drive voltage supplies power to the discharging MOSFETs Q39, Q45, Q52, and Q61 through resistors R172, R184, R200, R213, and R231 respectively, turning on the discharging MOSFETs and outputting the voltage. Since the power line terminals are pre-connected, there will be no sparking when the discharging MOSFETs are powered on.

[0028] After the battery is fully discharged, plug it into a charger or charging cabinet to recharge, and repeat the charging and discharging process described above.

[0029] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A circuit for preventing arcing during battery pack discharge, characterized in that, Includes MCU chip U6, analog front-end chip U4; and discharge anti-sparking control circuit connected to MCU chip U6 and analog front-end chip U4; The charging acceleration and shutdown module is connected to the discharge anti-sparking control circuit; the voltage input and equalization module and the power supply module are connected to the analog front-end chip U4.

2. The circuit for preventing arcing during battery pack discharge according to claim 1, characterized in that, The discharge anti-sparking control circuit includes MOSFET QC1; the gate of MOSFET QC1 is connected to capacitor Ca1, diode Dc1, resistor Rc2, and resistor Rc1; the other end of resistor Rc1 is connected to MOSFETs Q40, Q50, Q56, Q64, resistor R183, diode D17, MOSFET Q39, Q45, Q52, Q61, diode D59, and diode D60; the other end of diode D17 is connected to diode D51; the other end of diode D51 is connected to resistor R169; the gate of MOSFET Q39 is connected to resistor R184; the gate of MOSFET Q45 is connected to resistor R200; the gate of MOSFET Q52 is connected to resistor R213; the gate of MOSFET Q61 is connected to resistor R231; the source of MOSFET Q39 is connected to diode D56 and resistor R189; the other end of diode D56 is connected to diode D53 and resistor R172.

3. The circuit for preventing arcing during battery pack discharge according to claim 1, characterized in that, The charging acceleration and shutdown module includes transistor Q43; the emitter of transistor Q43 is connected to transistor Q15; the emitter of transistor Q15 is connected to resistor R50 and capacitor C20; the other end of resistor R50 is connected to diode D21; the base of transistor Q43 is connected to resistors R38 and R48; the other end of resistor R38 is connected to diode D20.

4. A circuit for preventing arcing during battery pack discharge according to claim 1, characterized in that, The power supply module includes a voltage regulator chip U1; the VIN pin of voltage regulator chip U1 is connected to a resistor R45 and a capacitor C34; the OUT pin of voltage regulator chip U1 is connected to a diode D5; the other end of diode D5 is connected to a capacitor C32; the other end of resistor R45 is connected to a diode D9; the other end of diode D9 is connected to capacitors C43, C41, and C40; diode D10, inductor L6, and resistor R155; the other end of the inductor is connected to the VSW pin of analog front-end chip U4; the VDC pin of analog front-end chip U4 is connected to a capacitor C30, a diode D4, a capacitor C28, and a diode D2; the other end of diode D2 is connected to a resistor R28; the VCC pin of analog front-end chip U4 is connected to a capacitor C37, a diode D7, a capacitor C35, and a diode D6; the other end of diode D6 is connected to a resistor R36; the VBAT pin of analog front-end chip U4 is connected to a capacitor C29, a diode D1, a capacitor C26, and a resistor R26.

5. A circuit for preventing arcing during battery pack discharge according to claim 1, characterized in that, The voltage input and equalization module includes connector socket P1 and connector socket P2; and each connector socket P1 and connector socket P2 is connected to several equalization modules; and the equalization module includes transistor Q2; the collector of transistor Q2 is connected to resistor R2; the base of transistor Q2 is connected to resistor R3; the emitter and base of transistor Q2 are connected to resistor R4; and capacitor C8 is connected between resistor R1 and resistor R4.

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