Battery reverse high voltage protection device

Abstract

The utility model relates to a battery reverse charging high voltage protection device. It comprises: a battery protection plate and a reverse charging high voltage protection plate, wherein the high voltage isolation power supply module and the high voltage isolation sampling module are connected with the battery protection plate, and the high voltage isolation sampling module and the high voltage isolation driving module are adaptively connected with the target battery; when the target battery is in an overvoltage and overcurrent state, the high voltage isolation power supply module is controlled to supply power to the high voltage isolation sampling module and the high voltage isolation driving module; when the target battery is in a reverse charging high voltage state through the high voltage isolation sampling module, the high voltage isolation driving module is controlled to discharge the reverse charging high voltage formed on the target battery until the reverse charging high voltage state of the target battery is removed; thereafter, the battery protection plate closes the power supply of the high voltage isolation power supply module to the high voltage isolation sampling module and the high voltage isolation driving module. The utility model can quickly and effectively detect the reverse charging high voltage state of the battery and provide effective protection for the battery.

Description

Technical Field

[0001] This utility model relates to a protection device, and more particularly to a battery reverse charging high voltage protection device. Background Technology

[0002] With the widespread application of electric vehicles and energy storage systems, battery safety has become one of the key technologies. In battery-based applications, batteries not only need to provide stable power output, but also need to protect themselves from damage under extreme conditions. For example, for electric vehicles, battery protection during emergency braking should be considered.

[0003] Currently, battery protection technology mainly relies on protection boards. Specifically, protection boards can cut off the circuit when abnormal voltage or current is detected to prevent battery damage. However, existing technologies that protect batteries with protection boards still have shortcomings in handling sudden high-voltage reverse currents, especially under high-current conditions. How to quickly and accurately detect and handle these reverse-charging high voltages has become a major challenge.

[0004] It is understandable that when the reverse charging high voltage and the current under the reverse charging high voltage cannot be detected quickly, the battery and the protection board may be damaged, that is, the battery cannot be effectively protected. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a battery reverse charging high voltage protection device that can quickly and effectively detect the reverse charging high voltage state of the battery and provide effective protection for the battery.

[0006] According to the technical solution provided by this utility model, a battery reverse charging high voltage protection device is provided, the protection device comprising:

[0007] A battery protection board is adapted to connect to the target battery to be protected and provides charge and discharge protection for at least the connected target battery.

[0008] The reverse charging high-voltage protection board includes at least a high-voltage isolated power supply module, a high-voltage isolated sampling module, and a high-voltage isolated drive module, wherein...

[0009] Both the high-voltage isolated power supply module and the high-voltage isolated sampling module are connected to the battery protection board, and the high-voltage isolated sampling module and the high-voltage isolated drive module are adapted to the target battery.

[0010] When the target battery is determined to be in an overvoltage and overcurrent state, the battery protection board cuts off the discharge state of the target battery and controls the high-voltage isolation power supply module to supply power to the high-voltage isolation sampling module and the high-voltage isolation drive module.

[0011] When the high-voltage isolation sampling module determines that the target battery is in a reverse charging high voltage state, it controls the high-voltage isolation drive module to discharge the reverse charging high voltage formed on the target battery until the reverse charging high voltage state of the target battery is released. After that, the battery protection board shuts off the power supply from the high-voltage isolation power supply module to the high-voltage isolation sampling module and the high-voltage isolation drive module.

[0012] The high-voltage isolation sampling module includes a front-end isolation sampling circuit, a voltage comparison trigger circuit, and a voltage-current mirror acquisition circuit, wherein...

[0013] The front-end isolation sampling circuit is connected to the positive terminal of the target battery to sample the voltage of the target battery through the front-end isolation sampling circuit, and generates a reverse charging high voltage protection sampling voltage after sampling. The reverse charging high voltage protection sampling voltage is then applied to the voltage comparison trigger circuit and the voltage and current mirror acquisition circuit.

[0014] When the target battery is determined to be in a reverse charging high voltage state, the voltage comparison trigger circuit generates a valid reverse charging high voltage protection trigger signal based on the reverse charging high voltage protection sampling voltage, and uses the reverse charging high voltage protection trigger signal to drive the high voltage isolation drive module to discharge the target battery under reverse charging high voltage.

[0015] The voltage and current mirror acquisition circuit generates a reverse charging high voltage protection isolation current based on the reverse charging high voltage protection sampling voltage, and applies the generated reverse charging high voltage protection isolation current to the battery protection board.

[0016] The high-voltage isolation drive module includes at least a high-speed isolation drive circuit and a high-voltage bleed circuit connected in sequence, wherein...

[0017] The high-speed isolation drive circuit is adapted to the voltage comparison trigger circuit. When the reverse charge high voltage protection trigger signal is in an effective state, the high-speed isolation drive circuit drives the high voltage discharge circuit to perform reverse charge high voltage discharge on the target battery.

[0018] The high-speed isolated drive circuit is also adapted and connected to the battery protection board, wherein...

[0019] When the target battery is in an overvoltage and overcurrent state, the high-speed isolation drive circuit is controlled by the battery protection board to regulate the drive state of the high-voltage leakage circuit.

[0020] The front-end isolation sampling circuit includes at least a high-voltage linear isolation optocoupler U14, wherein,

[0021] The anode of the LED inside the high-voltage linear isolation optocoupler U14 is connected to the positive terminal of the target battery through the high-voltage sampling resistor unit, and the anode of the LED inside the high-voltage linear isolation optocoupler U14 is also grounded through capacitor C71, while the cathode of the LED inside the high-voltage linear isolation optocoupler U14 is grounded.

[0022] The collector of the phototransistor inside the high-voltage linear isolation optocoupler U14 is connected to a voltage of 3V3C. The emitter of the phototransistor inside the high-voltage linear isolation optocoupler U14 is connected to one end of resistor R129, one end of capacitor C72, one end of resistor R132, and one end of resistor R121.

[0023] The other end of resistor R132 is connected to the voltage and current mirror acquisition circuit, and the other end of resistor R121 is connected to the voltage comparison trigger circuit.

[0024] The voltage comparison trigger circuit includes a sampling voltage comparison circuit and an isolation trigger circuit, wherein,

[0025] The sampling voltage comparison circuit receives the reverse charging high voltage protection sampling voltage and compares it with the reverse charging high voltage protection threshold voltage. If the received reverse charging high voltage protection sampling voltage is greater than the reverse charging high voltage protection threshold voltage, the isolation trigger circuit loads the effective reverse charging high voltage protection trigger signal to the high voltage isolation drive module to drive the high voltage isolation drive module to perform reverse charging high voltage discharge on the target battery.

[0026] The voltage and current mirror acquisition circuit includes a mirror isolation optocoupler U27, a first mirror acquisition operational amplifier, and a second mirror acquisition operational amplifier.

[0027] The non-inverting input of the first operational amplifier in the mirror acquisition is connected to the other end of resistor R132. The inverting input of the first operational amplifier in the mirror acquisition is connected to one end of capacitor C74 and one end of resistor R122. The other end of capacitor C74 and the output terminal of the first operational amplifier in the mirror acquisition are both connected to the anode of the light-emitting diode inside the mirror isolation optocoupler U27. The other end of resistor R122 is connected to one end of resistor R124 and the emitter of the phototransistor inside the mirror isolation optocoupler U27. The other end of resistor R124 is grounded. The collector of the mirror isolation optocoupler U27 is connected to a voltage of 3V3C.

[0028] The non-inverting input of the mirror acquisition second operational amplifier is connected to one end of resistor R123 and the cathode of the light-emitting diode inside the mirror isolation optocoupler U27; the inverting input of the mirror acquisition second operational amplifier is connected to one end of resistor R125 and the output terminal of the mirror second operational amplifier.

[0029] The other end of resistor R125 is connected to one end of capacitor C75, one end of resistor R126 and one end of resistor R184. The other end of resistor R126 is connected to the other end of resistor R121 and the voltage comparison trigger circuit. The other end of resistor R184 is connected to the battery protection board.

[0030] The high-speed isolated drive circuit includes an input node that receives a reverse charging high-voltage protection trigger signal, wherein,

[0031] The input node is connected to one end of resistor R103, one end of capacitor C34, and one end of resistor R106. The other end of resistor R103 is connected to the cathode of diode D17. The anode of diode D17 is connected to one end of resistor R83 and voltage 12VZD. The other end of resistor R83 is connected to the source of PMOS transistor Q24. The gate of PMOS transistor Q24 is connected to the gate of NMOS transistor Q26, the other end of capacitor C34, the other end of resistor R106, and one end of resistor R110.

[0032] The drain terminal of PMOS transistor Q24 is connected to the drain terminal of NMOS transistor Q26, one end of capacitor C33, and one end of resistor R104. The source terminal of NMOS transistor Q26 is connected to the negative terminal of the target battery. The other end of capacitor C33 and the other end of resistor R104 are connected to one end of resistor R105, the emitter terminal of PNP transistor Q27, one end of resistor R117, and the base terminal of PNP transistor Q29. The other ends of resistor R117 and resistor R110 are both connected to the negative terminal of the target battery.

[0033] The collector of PNP transistor Q27 is connected to one end of resistor R118. The other end of resistor R105 is connected to the cathode of Zener diode D20, one end of resistor R111, and one end of resistor R183. The other end of resistor R111, the anode of Zener diode D20, the other end of resistor R118, and the collector of PNP transistor Q29 are all connected to the negative terminal of the target battery.

[0034] The other end of resistor R183 is connected to the high-voltage bleed circuit.

[0035] The high-voltage bleed circuit includes a high-voltage bleed switch assembly and a bleed resistor unit adapted and connected to the high-voltage bleed switch assembly, wherein...

[0036] The high-voltage bleed switch group includes at least a high-voltage bleed NMOS transistor Q79 and a high-voltage bleed NMOS transistor Q77, wherein...

[0037] The gate of the high-voltage bleed NMOS transistor Q79 is connected to one end of resistor R155, the gate of the high-voltage bleed NMOS transistor Q77 is connected to one end of resistor R133, and the other ends of resistor R155 and resistor R133 are both connected to the output of the high-speed isolation drive circuit.

[0038] The source terminal of the high-voltage bleed NMOS transistor Q79 is connected to the source terminal of the high-voltage bleed NMOS transistor Q77, and is connected to the negative terminal of the target battery.

[0039] The drain terminals of both the high-voltage bleed NMOS transistor Q79 and Q77 are connected to node ZDO-, and are connected to the positive terminal of the target battery through the bleed resistor unit.

[0040] The high-voltage isolation power supply module includes at least a power supply switch circuit and an isolation power supply circuit connected in sequence, wherein,

[0041] The power supply switch circuit is connected to the battery protection board.

[0042] The isolated power supply circuit is adapted and connected to the high-voltage isolated sampling module and the high-voltage isolated drive module to provide the voltage required for the operation of the high-voltage isolated sampling module and the high-voltage isolated drive module.

[0043] The advantages of this utility model are: the battery protection board can provide charge and discharge protection for the target battery, and the reverse charging high voltage protection board can provide reverse charging high voltage protection for the target battery. Specifically, when the battery protection board determines that the target battery is in an overvoltage or overcurrent state, the reverse charging high voltage protection board will enter the working state. When it is determined that the target battery is in a reverse charging high voltage state, the high voltage isolation drive module is controlled to discharge the reverse charging high voltage formed on the target battery until the reverse charging high voltage state of the target battery is released. In other words, the reverse charging high voltage state of the battery can be detected quickly and effectively, and the battery can be effectively protected.

[0044] When the reverse charging high voltage state of the target battery is released, the battery protection board shuts off the power supply from the high voltage isolation power supply module to the high voltage isolation sampling module and the high voltage isolation drive module, thereby stopping the operation of the reverse charging high voltage protection board and restoring the normal operation of the target battery, which means that it will not affect the normal operation of the target battery. Attached Figure Description

[0045] Figure 1 This is a structural block diagram of one embodiment of the battery reverse charging high voltage protection device of this utility model.

[0046] Figure 2 This is a circuit diagram of one embodiment of the power supply switch circuit of this utility model.

[0047] Figure 3 A circuit diagram of one embodiment of the isolated power supply circuit of this utility model when providing 12V voltage.

[0048] Figure 4 This is a circuit diagram illustrating an embodiment of the connection and cooperation between the front-end isolation sampling circuit and the sampling voltage comparison circuit of this utility model.

[0049] Figure 5 This is a circuit diagram of one embodiment of the voltage and current mirror acquisition circuit of this utility model.

[0050] Figure 6This is a circuit diagram of one embodiment of the isolation trigger circuit of this utility model.

[0051] Figure 7 This is a circuit schematic diagram of one embodiment of the high-speed isolation drive circuit of this utility model.

[0052] Figure 8 This is a circuit diagram of one embodiment of the high-voltage leakage circuit of this utility model. Detailed Implementation

[0053] The present invention will be further described below with reference to the specific accompanying drawings and embodiments.

[0054] To enable rapid and effective detection of reverse charging high voltage conditions in batteries and provide effective protection for them, this utility model provides a battery reverse charging high voltage protection device. Specifically, the protection device includes:

[0055] A battery protection board is adapted to connect to the target battery to be protected and provides charge and discharge protection for at least the connected target battery.

[0056] The reverse charging high-voltage protection board includes at least a high-voltage isolated power supply module, a high-voltage isolated sampling module, and a high-voltage isolated drive module, wherein...

[0057] Both the high-voltage isolated power supply module and the high-voltage isolated sampling module are connected to the battery protection board, and the high-voltage isolated sampling module and the high-voltage isolated drive module are adapted to the target battery.

[0058] When the target battery is determined to be in an overvoltage and overcurrent state, the battery protection board cuts off the discharge state of the target battery and controls the high-voltage isolation power supply module to supply power to the high-voltage isolation sampling module and the high-voltage isolation drive module.

[0059] When the high-voltage isolation sampling module determines that the target battery is in a reverse charging high voltage state, it controls the high-voltage isolation drive module to discharge the reverse charging high voltage formed on the target battery until the reverse charging high voltage state of the target battery is released. After that, the battery protection board shuts off the power supply from the high-voltage isolation power supply module to the high-voltage isolation sampling module and the high-voltage isolation drive module.

[0060] Figure 1 The diagram shows a schematic representation of an embodiment of the battery reverse charging high-voltage protection device of this utility model. As can be seen from the diagram, the protection device should include at least a battery protection board and a reverse charging high-voltage protection board, both of which are adapted and connected to the target battery. Figure 1 In the middle, it displays having The symbol indicates a dangerous reverse charging high voltage. It is understood that the target battery is the battery to be protected in this utility model, and the target battery should be a type of battery that will experience reverse charging high voltage, such as a power battery. For a specific target battery, the occurrence of reverse charging high voltage can be consistent with existing technology. For example, if the target battery is a power battery in a new energy vehicle, the high-power motor in the new energy vehicle acts as the load on the target battery. When the new energy vehicle is braking, it will apply a reverse charging high voltage to the power battery. When the target battery is of other types and a reverse charging high voltage is generated on the target battery, please refer to the explanation here; further examples will not be provided.

[0061] As can be seen from the background art description, the prior art uses a battery protection board to protect the target battery from charging and discharging. Therefore, the battery protection board in this utility model can adopt the commonly used form. The method and process of using the battery protection board to protect the target battery from charging and discharging can be consistent with the prior art, and will not be described in detail here. Figure 1 The diagram illustrates a workflow of an embodiment of the battery protection board of this invention for charging and discharging protection of a target battery. As shown, the battery protection board detects the voltage and current of the target battery to determine if it is in an overvoltage or overcurrent state. When an overvoltage or overcurrent state is detected, the battery protection board shuts down the charging / discharging MOS switch connected to the target battery to stop charging or discharging the target battery. It is understood that the method by which the battery protection board detects the voltage and current of the target battery, and the method by which it determines whether it is in an overvoltage or overcurrent state, are consistent with existing technologies and will not be elaborated upon here.

[0062] To provide reverse-charge high-voltage protection for the target battery, a reverse-charge high-voltage protection board works in conjunction with the battery protection board. This protection prevents damage to both the battery protection board and the target battery under reverse-charge high voltage. As explained above, reverse-charge high voltage is only generated on the target battery under specific operating conditions. Therefore, when the target battery is not under reverse-charge high voltage, the reverse-charge high-voltage protection board should be in a non-operating state. In other words, the reverse-charge high-voltage protection board only needs to be operational when performing reverse-charge high-voltage protection to reduce power consumption and avoid affecting the reverse-charge high-voltage protection of the target battery.

[0063] Figure 1The document also illustrates an embodiment of a reverse-charge high-voltage protection board. As shown in the figure, the reverse-charge high-voltage protection board includes a high-voltage isolation power supply module, a high-voltage isolation sampling module, and a high-voltage isolation drive module. The high-voltage isolation power supply module enables isolated power supply. Based on the mechanism of reverse-charge high voltage, the target battery is in an overvoltage and overcurrent state before the high voltage occurs. Therefore, in order to quickly and effectively detect the reverse-charge high-voltage state and provide effective protection for the target battery, when the battery protection board detects that the target battery is in an overvoltage and overcurrent state, after cutting off the discharge state of the target battery, it should supply power to the high-voltage isolation sampling module and the high-voltage isolation drive module through the high-voltage isolation power supply module. It can be understood that after supplying power to the high-voltage isolation sampling module and the high-voltage isolation drive module, the reverse-charge high-voltage protection board enters the reverse-charge high-voltage protection state.

[0064] After entering the reverse charging high-voltage protection state, the high-voltage isolation sampling module samples the voltage of the target battery to determine whether it is under reverse charging high voltage. When it is determined that the target battery is under reverse charging high voltage, the high-voltage isolation sampling module controls the high-voltage isolation drive module to discharge the reverse charging high voltage formed on the target battery, thereby releasing the target battery from the reverse charging high voltage state. Releasing the target battery from the reverse charging high voltage state means that after the high voltage is discharged, the target battery is no longer under reverse charging high voltage. It can be understood that releasing the target battery from the reverse charging high voltage state can prevent damage to the target battery and / or the battery protection board caused by the reverse charging high voltage. Therefore, discharging the reverse charging high voltage formed on the target battery achieves reverse charging high voltage protection for the target battery.

[0065] When the target battery is working, the battery protection board provides charge and discharge protection, and the reverse charge high voltage protection board provides reverse charge high voltage protection to effectively ensure the safety of the target battery during operation. The reverse charge high voltage protection of the braking working board is to detect whether the target battery is in a reverse charge high voltage state, and after confirming that it is in a reverse charge high voltage state, to discharge the reverse charge high voltage formed on the target battery. Specifically, the method of determining whether the target battery is in a reverse charge high voltage state through the high voltage isolation sampling module and the method of discharging the reverse charge high voltage through the high voltage isolation drive module will be explained below. Please refer to the corresponding explanation below for details.

[0066] It should be understood that once the target battery is no longer in a reverse charging high-voltage state, it can return to normal operation. Afterward, only the battery protection board needs to be used for charge / discharge protection, and the reverse charging high-voltage protection board can be deactivated. In one embodiment of this invention, when deactivating the reverse charging high-voltage protection board, the battery protection board can shut off the power supply from the high-voltage isolation power supply module to the high-voltage isolation sampling module and the high-voltage isolation drive module. Of course, other methods can also be used to deactivate the reverse charging high-voltage protection board, which will not be elaborated here.

[0067] In one embodiment of this utility model, the high-voltage isolation power supply module includes at least a power supply switch circuit and an isolation power supply circuit connected in sequence, wherein...

[0068] The power supply switch circuit is connected to the battery protection board.

[0069] The isolated power supply circuit is adapted and connected to the high-voltage isolated sampling module and the high-voltage isolated drive module to provide the voltage required for the operation of the high-voltage isolated sampling module and the high-voltage isolated drive module.

[0070] Figure 1 The diagram shows an embodiment of a high-voltage isolated power supply module. As can be seen from the diagram, the high-voltage isolated power supply module may include a power supply switch circuit and an isolated power supply circuit. The power supply switch circuit is connected to the battery protection board, and the battery protection board can control the switching state of the power supply switch circuit, that is, control the power supply state of the isolated power supply circuit.

[0071] Figure 2 The diagram shows a circuit schematic of one embodiment of the power supply switching circuit. As can be seen from the diagram, the power supply switching circuit may include an NMOS transistor Q21 and a PMOS transistor Q15, wherein...

[0072] The gate of NMOS transistor Q21 is connected to one end of resistor R41 and one end of resistor R82. The other end of resistor R41 is connected to the battery protection board adapter. The other end of resistor R82 and the source of NMOS transistor Q21 are both grounded. The drain of NMOS transistor Q21 is connected to one end of resistor R38. The other end of resistor R38 is connected to one end of resistor R35 and the gate of PMOS transistor Q15. The other end of resistor R35 and the source of PMOS transistor Q15 are both connected to the 12VEXT voltage. The drain of PMOS transistor Q15 is connected to the output of the power supply switching circuit, that is, the drain of PMOS transistor Q15 is connected to the isolation power supply circuit.

[0073] When the battery protection board detects that the target battery is in an overvoltage and overcurrent state during operation, it will apply a high level to the NMOS transistor Q21, that is, drive the NMOS transistor Q21 and the PMOS transistor Q15 to conduct simultaneously, so as to provide a voltage of 12V3ZD to the isolated power supply circuit.

[0074] Figure 3 The figure illustrates one embodiment of an isolated power supply circuit, primarily showing an embodiment that converts a voltage of 12V3ZD to a voltage of 12VZD, where 12VZD is a 12V voltage. Figure 3 In the middle, the isolated power supply circuit includes a DC-DC converter chip U18, which can be a chip of model B1212S-1WR3. Figure 3 In this configuration, the Vin terminal of DC-DC converter chip U18 is connected to a voltage of 12V3ZD and grounded through capacitor C291, while the GND terminal of DC-DC converter chip U18 is also grounded. The VO+ terminal of DC-DC converter chip U18 is connected to one end of capacitor C28, one end of capacitor C27, and one end of capacitor C30. The other ends of capacitors C28, C27, and C30, as well as the 0V terminal of DC-DC converter chip U18, are all connected to the negative terminal of the target battery. A voltage of 12V3ZD can be obtained through the VO+ terminal of DC-DC converter chip U18.

[0075] It is understandable that other circuit forms can be used for the isolation power supply circuit. The voltage provided by the isolation power supply circuit should be sufficient to meet the working requirements of the high-voltage isolation sampling module and the high-voltage isolation drive module. Examples will not be given here.

[0076] In one embodiment of this utility model, the high-voltage isolation sampling module includes a front-end isolation sampling circuit, a voltage comparison trigger circuit, and a voltage-current mirror acquisition circuit, wherein...

[0077] The front-end isolation sampling circuit is connected to the positive terminal of the target battery to sample the voltage of the target battery through the front-end isolation sampling circuit, and generates a reverse charging high voltage protection sampling voltage after sampling. The reverse charging high voltage protection sampling voltage is then applied to the voltage comparison trigger circuit and the voltage and current mirror acquisition circuit.

[0078] When the target battery is determined to be in a reverse charging high voltage state, the voltage comparison trigger circuit generates a valid reverse charging high voltage protection trigger signal based on the reverse charging high voltage protection sampling voltage, and uses the reverse charging high voltage protection trigger signal to drive the high voltage isolation drive module to discharge the target battery under reverse charging high voltage.

[0079] The voltage and current mirror acquisition circuit generates a reverse charging high voltage protection isolation current based on the reverse charging high voltage protection sampling voltage, and applies the generated reverse charging high voltage protection isolation current to the battery protection board.

[0080] Figure 1An embodiment of a high-voltage isolation sampling module is shown in the figure. As can be seen from the figure, the high-voltage isolation sampling module may include a front-end isolation sampling circuit, a voltage comparison trigger circuit, and a voltage-current mirror acquisition circuit. Specifically, the front-end isolation sampling circuit can sample the voltage of the target battery and obtain the reverse charging high-voltage protection sampling voltage. The reverse charging high-voltage protection sampling voltage is then sent to the voltage comparison trigger circuit and the voltage-current mirror acquisition circuit. The voltage comparison trigger circuit determines whether the target battery is in a reverse charging high-voltage state based on the reverse charging high-voltage protection sampling voltage. When the target battery is completely disconnected from the load, the voltage-current mirror acquisition circuit can collect the high-voltage current of the load circuit and generate a reverse charging high-voltage protection isolation current. The reverse charging high-voltage protection isolation circuit is then applied to the battery protection board, so that the battery protection board can determine whether the reverse charging high-voltage state of the target battery has been released.

[0081] In one embodiment of this utility model, the front-end isolation sampling circuit includes at least a high-voltage linear isolation optocoupler U14, wherein...

[0082] The anode of the LED inside the high-voltage linear isolation optocoupler U14 is connected to the positive terminal of the target battery through the high-voltage sampling resistor unit, and the anode of the LED inside the high-voltage linear isolation optocoupler U14 is also grounded through capacitor C71, while the cathode of the LED inside the high-voltage linear isolation optocoupler U14 is grounded.

[0083] The collector of the phototransistor inside the high-voltage linear isolation optocoupler U14 is connected to a voltage of 3V3C. The emitter of the phototransistor inside the high-voltage linear isolation optocoupler U14 is connected to one end of resistor R129, one end of capacitor C72, one end of resistor R132, and one end of resistor R121.

[0084] The other end of resistor R132 is connected to the voltage and current mirror acquisition circuit, and the other end of resistor R121 is connected to the voltage comparison trigger circuit.

[0085] Figure 4 The diagram shows a circuit schematic of one embodiment of the front-end isolation sampling circuit. The high-voltage linear isolation optocoupler U14 can be an existing type of high-voltage isolation optocoupler, as long as it can achieve the function of high-voltage isolation. Figure 4 An embodiment of the high-voltage sampling resistor unit is shown in the figure. Figure 4 In the circuit, resistors R127, R128, R129, R130, and R131 are connected in series. Resistor R127 is connected to the positive terminal of the target battery, and resistor R31 is connected to the anode terminal of the LED inside the high-voltage linear isolation optocoupler U14. Of course, the high-voltage sampling resistor unit can also adopt other forms, depending on whether it meets the requirements of high-voltage sampling.

[0086] In practice, the sampled reverse charging high voltage protection sampling voltage can be applied to the voltage-current mirror acquisition circuit through resistor R132, and the sampled reverse charging high voltage protection sampling voltage can be applied to the voltage comparison trigger circuit through resistor R121.

[0087] In one embodiment of this utility model, the voltage comparison trigger circuit includes a sampling voltage comparison circuit and an isolation trigger circuit, wherein...

[0088] The sampling voltage comparison circuit receives the reverse charging high voltage protection sampling voltage and compares it with the reverse charging high voltage protection threshold voltage. If the received reverse charging high voltage protection sampling voltage is greater than the reverse charging high voltage protection threshold voltage, the isolation trigger circuit loads the effective reverse charging high voltage protection trigger signal to the high voltage isolation drive module to drive the high voltage isolation drive module to perform reverse charging high voltage discharge on the target battery.

[0089] To generate a reverse-charge high-voltage protection trigger signal, the voltage comparison trigger circuit can consist of a sampling voltage comparison circuit and an isolation trigger circuit. The sampling voltage comparison circuit receives the reverse-charge high-voltage protection sampling voltage and compares it with the reverse-charge high-voltage protection threshold voltage to determine if the target battery is in a reverse-charge high-voltage state. Specifically, if the reverse-charge high-voltage protection sampling voltage is greater than the reverse-charge high-voltage protection threshold, the sampling voltage comparison circuit generates a valid reverse-charge high-voltage protection trigger signal; otherwise, the generated signal is invalid. When the reverse-charge high-voltage protection trigger signal is valid, it can be loaded into the high-voltage isolation drive module via the isolation trigger circuit, driving the module to perform reverse-charge high-voltage discharge on the target battery. Otherwise, the module cannot perform this function.

[0090] Figure 4 The diagram shows a circuit schematic of an embodiment where a sampling voltage comparison circuit works in conjunction with a front-end isolation sampling circuit. Figure 4 In the sampled voltage comparison circuit, there is a voltage comparison chip U16. The voltage comparison chip U16 can be a commonly used voltage comparator. The model of the voltage comparison chip U16 can be selected as needed, which will not be elaborated here. Figure 4 In the circuit, the non-inverting input of voltage comparator chip U16 is connected to resistor R121, the inverting input of voltage comparator chip U16 is connected to one end of resistor R130 and one end of resistor R237, the other end of resistor R237 is grounded, the other end of resistor R130 is connected to voltage 3V3C, the VCC+ terminal of voltage comparator chip U16 is also connected to voltage 3V3C, the output terminal of voltage comparator chip U16 is connected to one end of resistor R39, and the other end of resistor R39 can also be connected to the battery protection board.

[0091] Figure 4 In the process, the voltage 3V3C and the resistor R130 can form the reverse charging high voltage protection threshold voltage, and the reverse charging high voltage protection trigger signal can be obtained through the output of the voltage comparator chip U16. Figure 4 In the embodiment shown, when in the active state, the reverse charging high voltage protection trigger signal is high; when in the inactive state, the reverse charging high voltage protection trigger signal is low.

[0092] Figure 6 An embodiment of an isolated trigger circuit is shown in the figure. The isolated trigger circuit includes an isolated trigger LED, an isolated trigger photodiode, and an isolated trigger phototransistor. U26 is the isolated trigger circuit, which can be constructed using commonly used chips. The anode of the isolated trigger LED is connected to the output terminal of the voltage comparator chip U16. The cathode of the isolated trigger photodiode and the base of the isolated trigger phototransistor are both connected to a voltage of 12VZD. The anode of the isolated trigger photodiode is also connected to the base of the isolated trigger phototransistor. The emitter of the isolated trigger phototransistor is grounded through resistor R116. The collector of the isolated trigger phototransistor is connected to one end of resistor R101, one end of capacitor C35, and one end of resistor R134. The other ends of resistor R101 and capacitor C35 are connected to the negative terminal of the target battery. The other end of resistor R134 is connected to the high-voltage isolated drive module.

[0093] It should be noted that, Figures 2-8 In the diagram, P- represents the negative terminal of the target battery, and P+ represents the positive terminal of the target battery. As explained above, when the reverse-charge high-voltage protection trigger signal is active, a high-level reverse-charge high-voltage protection trigger signal can be applied to the high-voltage isolation drive module through resistor R134; otherwise, a high-level reverse-charge high-voltage protection trigger signal cannot be applied to the high-voltage isolation drive module. When the voltage comparison trigger circuit samples the above circuit configuration, an active reverse-charge high-voltage protection trigger signal can be applied to the high-speed drive isolation circuit within 1μs, enabling rapid triggering of the reverse-charge high-voltage protection.

[0094] In one embodiment of this utility model, the voltage and current mirror acquisition circuit includes a mirror isolation optocoupler U27, a mirror acquisition first operational amplifier, and a mirror acquisition second operational amplifier, wherein...

[0095] The non-inverting input of the first operational amplifier in the mirror acquisition is connected to the other end of resistor R132. The inverting input of the first operational amplifier in the mirror acquisition is connected to one end of capacitor C74 and one end of resistor R122. The other end of capacitor C74 and the output terminal of the first operational amplifier in the mirror acquisition are both connected to the anode of the light-emitting diode inside the mirror isolation optocoupler U27. The other end of resistor R122 is connected to one end of resistor R124 and the emitter of the phototransistor inside the mirror isolation optocoupler U27. The other end of resistor R124 is grounded. The collector of the mirror isolation optocoupler U27 is connected to a voltage of 3V3C.

[0096] The non-inverting input of the mirror acquisition second operational amplifier is connected to one end of resistor R123 and the cathode of the light-emitting diode inside the mirror isolation optocoupler U27; the inverting input of the mirror acquisition second operational amplifier is connected to one end of resistor R125 and the output terminal of the mirror second operational amplifier.

[0097] The other end of resistor R125 is connected to one end of capacitor C75, one end of resistor R126, and one end of resistor R184. The other end of resistor R126 is connected to the other end of resistor R121 and the voltage comparison trigger circuit. The other end of resistor R184 is connected to the battery protection board.

[0098] Figure 5 The diagram shows a circuit schematic of one embodiment of the voltage and current mirror acquisition circuit. Specifically, the mirror isolation optocoupler U27 can adopt the commonly used form. The voltage 3V3C is 3.3V. The voltage 3V3C can be provided by the isolation power supply circuit. The way the isolation power supply circuit provides the voltage 3V3C can be consistent with the existing technology, which will not be described in detail here. Figure 5 In the diagram, U36A is the first operational amplifier for mirror acquisition, and U36B is the second operational amplifier for mirror acquisition. The positive terminal of the first operational amplifier for mirror acquisition is connected to a voltage of 3V3C and one end of capacitor C73. The other end of capacitor C73 is grounded, and the negative terminal of the first operational amplifier for mirror acquisition is also grounded.

[0099] In practice, by connecting resistor R184 to the battery protection board, a reverse charging high voltage protection isolation current can be applied to the battery protection board. In addition, by connecting resistor R39 to the battery protection board, a reverse charging high voltage state at the load end can be applied to the battery protection board. The battery protection board determines whether the reverse charging high voltage state of the target battery has been released based on the reverse charging high voltage protection isolation current and the received reverse charging high voltage state. If the reverse charging high voltage state has been released, the reverse charging high voltage protection of the reverse charging high voltage protection board can be stopped.

[0100] In one embodiment of this utility model, the high-voltage isolation drive module includes at least a high-speed isolation drive circuit and a high-voltage bleed circuit connected in sequence, wherein...

[0101] The high-speed isolation drive circuit is adapted to the voltage comparison trigger circuit. When the reverse charge high voltage protection trigger signal is in an effective state, the high-speed isolation drive circuit drives the high voltage discharge circuit to perform reverse charge high voltage discharge on the target battery.

[0102] Figure 1 The figure shows an embodiment of a high-voltage isolation drive module. As can be seen from the figure, the high-voltage isolation drive module may include a high-speed isolation drive circuit and a high-voltage discharge circuit. The high-speed isolation drive circuit can receive a reverse charge high-voltage protection trigger signal, but the high-speed isolation drive circuit can only drive the high-voltage discharge circuit to discharge the target battery during reverse charge when the reverse charge high-voltage protection trigger signal is in a valid state.

[0103] In one embodiment of this utility model, the high-speed isolation drive circuit includes an input node that receives a reverse charging high-voltage protection trigger signal, wherein,

[0104] The input node is connected to one end of resistor R103, one end of capacitor C34, and one end of resistor R106. The other end of resistor R103 is connected to the cathode of diode D17. The anode of diode D17 is connected to one end of resistor R83 and voltage 12VZD. The other end of resistor R83 is connected to the source of PMOS transistor Q24. The gate of PMOS transistor Q24 is connected to the gate of NMOS transistor Q26, the other end of capacitor C34, the other end of resistor R106, and one end of resistor R110.

[0105] The drain terminal of PMOS transistor Q24 is connected to the drain terminal of NMOS transistor Q26, one end of capacitor C33, and one end of resistor R104. The source terminal of NMOS transistor Q26 is connected to the negative terminal of the target battery. The other end of capacitor C33 and the other end of resistor R104 are connected to one end of resistor R105, the emitter terminal of PNP transistor Q27, one end of resistor R117, and the base terminal of PNP transistor Q29. The other ends of resistor R117 and resistor R110 are both connected to the negative terminal of the target battery.

[0106] The collector of PNP transistor Q27 is connected to one end of resistor R118. The other end of resistor R105 is connected to the cathode of Zener diode D20, one end of resistor R111, and one end of resistor R183. The other end of resistor R111, the anode of Zener diode D20, the other end of resistor R118, and the collector of PNP transistor Q29 are all connected to the negative terminal of the target battery.

[0107] The other end of resistor R183 is connected to the high-voltage bleed circuit.

[0108] Figure 7 An embodiment of a high-speed isolated drive circuit is shown in the figure. Figure 7 CC in the code refers to the reverse charging high voltage protection trigger signal loaded by the isolation trigger circuit. Specifically, an isolation drive signal can be generated through resistor R183. Figure 7 ZD- in the diagram refers to the isolation drive signal. As explained above, when the reverse charge high voltage protection trigger signal is active, the isolation drive signal is also active. In this case, the active isolation drive signal controls the high voltage discharge circuit to perform reverse charge high voltage discharge.

[0109] When the high-speed isolation drive circuit adopts the above circuit configuration, and the reverse charge high voltage protection trigger signal is in an effective state, an effective isolation drive signal can be output within 10μs, so as to quickly drive the high voltage discharge circuit to perform reverse charge high voltage discharge.

[0110] In one embodiment of this utility model, the high-speed isolation drive circuit is also adapted and connected to a battery protection board, wherein...

[0111] When the target battery is in an overvoltage and overcurrent state, the high-speed isolation drive circuit is controlled by the battery protection board to regulate the drive state of the high-voltage leakage circuit.

[0112] It is understandable that regulating the driving state of the high-voltage discharge current of the high-speed isolation drive circuit specifically refers to regulating the discharge state of the high-voltage discharge circuit on the reverse charging high voltage formed on the target battery. This may include discharging the reverse charging high voltage on the target battery or stopping the discharge of the reverse charging high voltage on the target battery. Specifically, the discharge state of the high-voltage discharge circuit on the reverse charging high voltage of the target battery can be determined according to the state of the reverse charging high voltage on the target battery.

[0113] As explained above, when the voltage comparison trigger circuit determines that the target battery is in a reverse-charge high-voltage state, a valid reverse-charge high-voltage protection trigger signal is applied to the high-speed isolation drive circuit. Subsequently, the high-voltage discharge circuit can discharge the target battery at high voltage. When greater flexibility in controlling the high-voltage discharge circuit's discharge of the target battery is required, the battery protection board can be connected to the high-speed isolation drive circuit, and a reverse-charge high-voltage protection control signal similar to the reverse-charge high-voltage protection trigger signal can be applied to the high-speed isolation drive circuit. Therefore, when the reverse-charge high-voltage protection control signal is valid, the high-speed isolation drive circuit can be configured to drive the high-speed discharge circuit to discharge the target battery at high voltage even when the reverse-charge high-voltage protection trigger signal is invalid.

[0114] The effective state of the reverse charging high voltage protection control signal can be referred to the above description of the effective state of the reverse charging high voltage protection trigger signal. Furthermore, when the reverse charging high voltage protection control signal is low, the driving state of the high-speed isolation drive circuit to the high-speed discharge circuit can be turned off, thus stopping the high-speed discharge circuit from discharging the reverse charging high voltage to the target battery. In specific implementation, when the battery protection board applies the reverse charging high voltage protection control signal to the high-speed isolation drive circuit, it can use an isolation triggering method similar to that of the isolation triggering circuit. For details, please refer to the above description of the isolation triggering circuit; it will not be repeated here.

[0115] In one embodiment of this utility model, the high-voltage bleeder circuit includes a high-voltage bleeder switch assembly and a bleeder resistor unit adapted and connected to the high-voltage bleeder switch assembly, wherein...

[0116] The high-voltage bleed switch group includes at least a high-voltage bleed NMOS transistor Q79 and a high-voltage bleed NMOS transistor Q77, wherein...

[0117] The gate of the high-voltage bleed NMOS transistor Q79 is connected to one end of resistor R155, the gate of the high-voltage bleed NMOS transistor Q77 is connected to one end of resistor R133, and the other ends of resistor R155 and resistor R133 are both connected to the output of the high-speed isolation drive circuit.

[0118] The source terminal of the high-voltage bleed NMOS transistor Q79 is connected to the source terminal of the high-voltage bleed NMOS transistor Q77, and is connected to the negative terminal of the target battery.

[0119] The drain terminals of both the high-voltage bleed NMOS transistor Q79 and Q77 are connected to node ZDO-, and are connected to the positive terminal of the target battery through the bleed resistor unit.

[0120] Figure 8 The diagram shows a schematic of one embodiment of the high-voltage bleed circuit. The high-voltage bleed NMOS transistors Q79 and Q77 should be commonly used high-voltage MOS transistors. The type of high-voltage MOS transistor used can be selected as needed to meet the requirements of high-voltage discharge for reverse charging of the target battery. Figure 8 The figure shows one embodiment of the bleeder resistor unit. The bleeder resistor unit includes resistors RB6, RB7, RB8, RB9 and RB10 connected in parallel. Of course, the bleeder resistor unit can also adopt other circuit forms, which can be selected according to actual needs.

[0121] During operation, when the isolation drive signal is active, both high-voltage bleed NMOS transistors Q79 and Q77 are in the conducting state. At this time, the positive terminal of the target battery is connected to the negative terminal of the target battery through the bleed resistor unit, thereby discharging the reverse-charge high voltage and ultimately releasing the target battery from the reverse-charge high voltage state. Of course, other forms of the high-voltage bleed circuit can also be used, depending on the specific requirements; these will not be listed here.

[0122] To further protect the target battery and battery protection board, a TVS (Transient Voltage Suppressor) array protection circuit can be installed within the high-voltage isolation drive module. This TVS array protection circuit clamps the voltage of the target battery to provide short-term voltage protection. Specifically, the TVS array protection circuit can adopt commonly used forms, and the choice can be made according to specific needs. It should be noted that the TVS array protection circuit can also be installed on the battery protection board; the location of the TVS array protection circuit can be selected as needed, prioritizing the provision of short-term voltage clamping protection for the target battery.

Claims

1. A battery reverse charging high voltage protection device, characterized in that, The protective device includes: A battery protection board is adapted to connect to the target battery to be protected and provides charge and discharge protection for at least the connected target battery. The reverse charging high-voltage protection board includes at least a high-voltage isolated power supply module, a high-voltage isolated sampling module, and a high-voltage isolated drive module, wherein... Both the high-voltage isolated power supply module and the high-voltage isolated sampling module are connected to the battery protection board, and the high-voltage isolated sampling module and the high-voltage isolated drive module are adapted to the target battery. When the target battery is determined to be in an overvoltage and overcurrent state, the battery protection board cuts off the discharge state of the target battery and controls the high-voltage isolation power supply module to supply power to the high-voltage isolation sampling module and the high-voltage isolation drive module. When the high-voltage isolation sampling module determines that the target battery is in a reverse charging high voltage state, it controls the high-voltage isolation drive module to discharge the reverse charging high voltage formed on the target battery until the reverse charging high voltage state of the target battery is released. After that, the battery protection board shuts off the power supply of the high-voltage isolation power supply module to the high-voltage isolation sampling module and the high-voltage isolation drive module. The high-voltage isolation sampling module includes a front-end isolation sampling circuit, a voltage comparison trigger circuit, and a voltage-current mirror acquisition circuit, wherein... The front-end isolation sampling circuit is connected to the positive terminal of the target battery to sample the voltage of the target battery through the front-end isolation sampling circuit, and generates a reverse charging high voltage protection sampling voltage after sampling. The reverse charging high voltage protection sampling voltage is then applied to the voltage comparison trigger circuit and the voltage and current mirror acquisition circuit. When the target battery is determined to be in a reverse charging high voltage state, the voltage comparison trigger circuit generates a valid reverse charging high voltage protection trigger signal based on the reverse charging high voltage protection sampling voltage, and uses the reverse charging high voltage protection trigger signal to drive the high voltage isolation drive module to discharge the target battery under reverse charging high voltage. The voltage and current mirror acquisition circuit generates a reverse charging high voltage protection isolation current based on the reverse charging high voltage protection sampling voltage, and applies the generated reverse charging high voltage protection isolation current to the battery protection board.

2. The battery reverse charging high voltage protection device according to claim 1, characterized in that: The high-voltage isolation drive module includes at least a high-speed isolation drive circuit and a high-voltage bleed circuit connected in sequence, wherein... The high-speed isolation drive circuit is adapted to the voltage comparison trigger circuit. When the reverse charge high voltage protection trigger signal is in an effective state, the high-speed isolation drive circuit drives the high voltage discharge circuit to perform reverse charge high voltage discharge on the target battery.

3. The battery reverse charging high voltage protection device according to claim 2, characterized in that: The high-speed isolated drive circuit is also adapted and connected to the battery protection board, wherein... When the target battery is in an overvoltage and overcurrent state, the high-speed isolation drive circuit is controlled by the battery protection board to regulate the drive state of the high-voltage leakage circuit.

4. The battery reverse charging high voltage protection device according to any one of claims 1 to 3, characterized in that: The front-end isolation sampling circuit includes at least a high-voltage linear isolation optocoupler U14, wherein, The anode of the LED inside the high-voltage linear isolation optocoupler U14 is connected to the positive terminal of the target battery through the high-voltage sampling resistor unit, and the anode of the LED inside the high-voltage linear isolation optocoupler U14 is also grounded through capacitor C71, while the cathode of the LED inside the high-voltage linear isolation optocoupler U14 is grounded. The collector of the phototransistor inside the high-voltage linear isolation optocoupler U14 is connected to a voltage of 3V3C. The emitter of the phototransistor inside the high-voltage linear isolation optocoupler U14 is connected to one end of resistor R129, one end of capacitor C72, one end of resistor R132, and one end of resistor R121. The other end of resistor R132 is connected to the voltage and current mirror acquisition circuit, and the other end of resistor R121 is connected to the voltage comparison trigger circuit.

5. The battery reverse charging high voltage protection device according to any one of claims 1 to 3, characterized in that: The voltage comparison trigger circuit includes a sampling voltage comparison circuit and an isolation trigger circuit, wherein, The sampling voltage comparison circuit receives the reverse charging high voltage protection sampling voltage and compares it with the reverse charging high voltage protection threshold voltage. If the received reverse charging high voltage protection sampling voltage is greater than the reverse charging high voltage protection threshold voltage, the isolation trigger circuit loads the effective reverse charging high voltage protection trigger signal to the high voltage isolation drive module to drive the high voltage isolation drive module to perform reverse charging high voltage discharge on the target battery.

6. The battery reverse charging high voltage protection device according to claim 4, characterized in that: The voltage and current mirror acquisition circuit includes a mirror isolation optocoupler U27, a first mirror acquisition operational amplifier, and a second mirror acquisition operational amplifier. The non-inverting input of the first operational amplifier in the mirror acquisition is connected to the other end of resistor R132. The inverting input of the first operational amplifier in the mirror acquisition is connected to one end of capacitor C74 and one end of resistor R122. The other end of capacitor C74 and the output terminal of the first operational amplifier in the mirror acquisition are both connected to the anode of the light-emitting diode inside the mirror isolation optocoupler U27. The other end of resistor R122 is connected to one end of resistor R124 and the emitter of the phototransistor inside the mirror isolation optocoupler U27. The other end of resistor R124 is grounded. The collector of the mirror isolation optocoupler U27 is connected to a voltage of 3V3C. The non-inverting input of the mirror acquisition second operational amplifier is connected to one end of resistor R123 and the cathode of the light-emitting diode inside the mirror isolation optocoupler U27; the inverting input of the mirror acquisition second operational amplifier is connected to one end of resistor R125 and the output terminal of the mirror second operational amplifier. The other end of resistor R125 is connected to one end of capacitor C75, one end of resistor R126 and one end of resistor R184. The other end of resistor R126 is connected to the other end of resistor R121 and the voltage comparison trigger circuit. The other end of resistor R184 is connected to the battery protection board.

7. The battery reverse charging high voltage protection device according to claim 2 or 3, characterized in that: The high-speed isolated drive circuit includes an input node that receives a reverse charging high-voltage protection trigger signal, wherein, The input node is connected to one end of resistor R103, one end of capacitor C34, and one end of resistor R106. The other end of resistor R103 is connected to the cathode of diode D17. The anode of diode D17 is connected to one end of resistor R83 and voltage 12VZD. The other end of resistor R83 is connected to the source of PMOS transistor Q24. The gate of PMOS transistor Q24 is connected to the gate of NMOS transistor Q26, the other end of capacitor C34, the other end of resistor R106, and one end of resistor R110. The drain terminal of PMOS transistor Q24 is connected to the drain terminal of NMOS transistor Q26, one end of capacitor C33, and one end of resistor R104. The source terminal of NMOS transistor Q26 is connected to the negative terminal of the target battery. The other end of capacitor C33 and the other end of resistor R104 are connected to one end of resistor R105, the emitter terminal of PNP transistor Q27, one end of resistor R117, and the base terminal of PNP transistor Q29. The other ends of resistor R117 and resistor R110 are both connected to the negative terminal of the target battery. The collector of PNP transistor Q27 is connected to one end of resistor R118. The other end of resistor R105 is connected to the cathode of Zener diode D20, one end of resistor R111, and one end of resistor R183. The other end of resistor R111, the anode of Zener diode D20, the other end of resistor R118, and the collector of PNP transistor Q29 are all connected to the negative terminal of the target battery. The other end of resistor R183 is connected to the high-voltage bleed circuit.

8. The battery reverse charging high voltage protection device according to claim 2 or 3, characterized in that: The high-voltage bleed circuit includes a high-voltage bleed switch assembly and a bleed resistor unit adapted and connected to the high-voltage bleed switch assembly, wherein... The high-voltage bleed switch group includes at least a high-voltage bleed NMOS transistor Q79 and a high-voltage bleed NMOS transistor Q77, wherein... The gate of the high-voltage bleed NMOS transistor Q79 is connected to one end of resistor R155, the gate of the high-voltage bleed NMOS transistor Q77 is connected to one end of resistor R133, and the other ends of resistor R155 and resistor R133 are both connected to the output of the high-speed isolation drive circuit. The source terminal of the high-voltage bleed NMOS transistor Q79 is connected to the source terminal of the high-voltage bleed NMOS transistor Q77, and is connected to the negative terminal of the target battery. The drain terminals of both the high-voltage bleed NMOS transistor Q79 and Q77 are connected to node ZDO-, and are connected to the positive terminal of the target battery through the bleed resistor unit.

9. The battery reverse charging high voltage protection device according to any one of claims 1 to 3, characterized in that: The high-voltage isolation power supply module includes at least a power supply switch circuit and an isolation power supply circuit connected in sequence, wherein, The power supply switch circuit is connected to the battery protection board. The isolated power supply circuit is adapted and connected to the high-voltage isolated sampling module and the high-voltage isolated drive module to provide the voltage required for the operation of the high-voltage isolated sampling module and the high-voltage isolated drive module.

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