CN214380064U - Battery pack protection circuit, device and electric equipment - Google Patents
Battery pack protection circuit, device and electric equipment Download PDFInfo
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- CN214380064U CN214380064U CN202022494983.2U CN202022494983U CN214380064U CN 214380064 U CN214380064 U CN 214380064U CN 202022494983 U CN202022494983 U CN 202022494983U CN 214380064 U CN214380064 U CN 214380064U
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Abstract
The utility model is suitable for a battery package technical field provides a battery package protection circuit, device and electrical equipment, and the circuit includes the controller that is connected with battery package first end, the bleeder module who adopts isolator that is connected with the controller, and connect the switch module between battery package second end and charging port; the input side of the bleeder module and the controller form a control loop, and the output side of the bleeder module and the switch module form a discharge loop; when the controller outputs a first control signal, the switch module is controlled to conduct the battery pack and the charging port, and meanwhile the release module is controlled to stop working; and when the second control signal is output, the switch module is controlled to cut off the battery pack and the charging port, and the discharge module is controlled to discharge the switch module. The utility model provides an among the current battery package working process cause the problem of damage to power MOS pipe.
Description
Technical Field
The utility model belongs to the technical field of the battery package, especially, relate to a battery package protection circuit, device and electrical equipment.
Background
With the development of science and technology, more and more users use the electrical equipment who carries the battery package, wherein for the effective control of realization to battery package charge-discharge, add BMS in the battery package usually for can detect and control current-voltage and temperature when charging, realize the effective protection to the battery package.
However, in the BMS scheme in which the charging loop is controlled at a low side, the charging power MOS is an NMOS transistor, the source S of the MOS transistor is connected to the charging negative terminal C-of the charger, the gate G of the MOS transistor is controlled by the BMS, and the BMS control driving circuit is connected in series to the rectifier diode to prevent current backflow.
At present, because the grid G of the charging power MOS is controlled by the BMS, and the source S of the charging power MOS tube is connected with the charging negative terminal C-of the charger, the two ends of the GS of the charging power MOS are not connected with one another, at the moment, the GS of the charging power MOS tube cannot form a discharge loop with the BMS when discharging the charge, at present, a triode is usually added at the GS of the charging power MOS tube for discharging the charge, but the discharge speed is low, the charging power MOS tube is easily damaged, and the charging power MOS tube is not controlled by the BMS.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a battery package protection circuit aims at solving and causes the problem of damage to power MOS pipe in the current battery package working process.
The embodiment of the utility model provides a realize like this, a battery package protection circuit, the circuit includes:
the battery pack charging system comprises a controller connected with a first end of a battery pack, a discharge module which is connected with the controller and adopts an isolating switch, and a switch module connected between a second end of the battery pack and a charging port;
the input side of the bleeder module and the controller form a control loop, and the output side of the bleeder module and the switch module form a discharge loop;
when the controller outputs a first control signal, the switch module is controlled to conduct a battery pack and a charging port, and meanwhile the discharge module is controlled to stop working; and when outputting the second control signal, controlling the switch module to cut off the battery pack and the charging port, and simultaneously controlling the discharge module to discharge the switch module.
Furthermore, the circuit further comprises an anti-reverse module which is respectively connected with the controller, the bleeder module and the switch module;
the reverse-flow prevention module is a reverse-flow prevention diode, the anode of the reverse-flow prevention diode is connected with the controller, and the cathode of the reverse-flow prevention diode is connected with the discharge module and the switch module.
Still further, the bleed module includes:
the bleeder unit is connected with the switch module and adopts an isolating switch, and is used for discharging the switch module; and
the control unit is respectively connected with the controller and the discharge unit and is used for controlling the working state of the discharge unit according to the corresponding signal of the controller;
the switch module is respectively connected with the discharge unit and the reverse prevention module.
Still further, the bleed unit comprises: the circuit comprises an isolating switch, a first resistor, a second resistor and a first voltage stabilizing diode;
the first end of the isolating switch is connected with one end of the first resistor, the second end of the isolating switch is connected with the control unit, the third end of the isolating switch is connected with one end of the second resistor, the anode of the first voltage stabilizing diode and one end of the switch module connected with the charging port, the fourth end of the isolating switch is connected with the other end of the second resistor, the cathode of the first voltage stabilizing diode and one end of the switch module connected with the anti-reverse module, and the other end of the first resistor is connected with the power supply end.
Still further, the control unit includes: the resistor comprises a first field effect transistor, a third resistor, a fourth resistor, a fifth resistor, a second field effect transistor, a sixth resistor and a seventh resistor;
the first end of the first field effect tube is connected with the bleeder unit, the second end of the first field effect tube is connected with one end of the third resistor and one end of the fourth resistor, the third end of the first field effect tube is grounded with the other end of the third resistor, the other end of the fourth resistor is connected with one end of the fifth resistor and the first end of the second field effect tube, the other end of the fifth resistor is connected with the power supply end, the second end of the second field effect tube is connected with one end of the sixth resistor and one end of the seventh resistor, the third end of the second field effect tube is grounded with the other end of the sixth resistor, and the other end of the seventh resistor is connected with the controller.
Furthermore, the switch module comprises a third field effect transistor, a fourth field effect transistor, an eighth resistor and a ninth resistor;
the first end of the third field effect transistor is connected with the second end of the battery pack, the second end of the third field effect transistor is connected with one end of the eighth resistor, the third end of the third field effect transistor is connected with the third end of the fourth field effect transistor, the second end of the fourth field effect transistor is connected with one end of the ninth resistor, the other end of the ninth resistor is connected with the anti-reverse module and the discharge module respectively, and the first end of the fourth field effect transistor is connected with the discharge module and the charging port respectively.
Furthermore, the bleeder unit further comprises a debugging resistor connected between the third end of the isolating switch and one end of the switch module connected with the anti-reverse module.
The utility model discloses another embodiment still provides a battery package protection device, the device includes the battery package and the aforesaid battery package protection circuit.
Another embodiment of the present invention further provides an electric device, wherein the electric device comprises the above battery pack protection device.
The embodiment of the utility model provides a battery pack protection circuit, owing to set up the controller and the bleeder module of being connected with the switch module, owing to bleed module adopts isolator, its input side forms control circuit with the controller, its output side forms the circuit of discharging with the switch module, makes its bleeder module be controlled by the controller, when making the work of controller drive switch module thereby charge, controls the bleeder module simultaneously and stops the discharge to the switch module; when the controller drives the switch module not to work and does not charge, the corresponding control release module of the controller releases the charges in the switch module quickly, so that the quick and safe discharge of the switch module is realized, and the problem of damage to the power MOS tube in the working process of the existing battery pack is solved.
Drawings
Fig. 1 is a schematic block diagram of a battery pack protection circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a battery pack protection circuit according to another embodiment of the present invention, which is connected to a bleeding module;
fig. 3 is a circuit diagram of a battery pack protection circuit according to another embodiment of the present invention, the circuit diagram being connected to a switch module;
fig. 4 is a circuit diagram of a battery pack protection circuit according to another embodiment of the present invention, connected to a controller;
fig. 5 is a circuit diagram of a battery pack protection circuit according to another embodiment of the present invention, which is connected to a bleeding module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The utility model is provided with the controller and the release module which are connected with the switch module, and the release module adopts the isolating switch, the input side of the release module forms a control loop with the controller, and the output side of the release module forms a discharging loop with the switch module, so that the release module is controlled by the controller, and when the controller drives the switch module to work and charge, the release module is controlled to stop discharging the switch module; when the controller drives the switch module not to work and does not charge, the corresponding control release module of the controller releases the charges in the switch module quickly, so that the quick and safe discharge of the switch module is realized, and the problem of damage to the power MOS tube in the working process of the existing battery pack is solved.
Example one
Please refer to fig. 1, which is a schematic block diagram of a battery pack protection circuit according to a first embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown, and the battery pack protection circuit according to an embodiment of the present invention includes:
a controller 20 connected to a first end of the battery pack, a bleed-off module 30 using an isolation switch connected to the controller 20, and a switch module 40 connected between a second end of the battery pack and the charging port;
the input side of the bleed-off module 30 forms a control loop with the controller 20, and the output side of the bleed-off module 30 forms a discharge loop with the switch module 40;
when the controller 20 outputs the first control signal, the switch module 40 is controlled to turn on the battery pack and the charging port, and the bleeding module 30 is controlled to stop working; and when the second control signal is output, the switch module 40 is controlled to cut off the battery pack and the charging port, and the discharging module 30 is controlled to discharge the switch module 40.
The utility model discloses an in an embodiment, be equipped with charge port and discharge port on this battery package, wherein during concrete implementation in this embodiment, this battery package first end is the positive terminal BAT + of battery package, battery package second end is the negative terminal BAT "of battery package, this charge port is used for connecting the charger, discharge port is used for connecting the load, wherein, this charge port and discharge port can be for the setting of same mouthful in this embodiment, also can be for different mouthful settings, also when charge port and discharge port set up with the same mouthful, then use as charge port when this port connects the charger, use as discharge port when this port connects the load. The setting mode of the charging port and the discharging port is set according to the actual use requirement, and is not limited herein.
Further, as shown in fig. 3, the charging port includes a charging positive terminal C + and a charging negative terminal C-, and the discharging port includes a discharging positive terminal P + and a discharging negative terminal P-. When the battery pack positive terminal BAT + is connected with the charging positive terminal C + and the discharging positive terminal P +, the switch module 40 is connected between the battery pack negative terminal BAT-and the charging negative terminal C-and the discharging negative terminal P-, and the switch module 40 can control the connection state between the battery pack and the charger.
Further, in an embodiment of the present invention, the bleeding module 30 is respectively connected to the controller 20 and the switch module 40, and is used for controlling the discharging state of the switch module 40 according to the control response of the controller 20, wherein it is pointed out that the bleeding module 30 adopts an isolating switch, and in this embodiment, when in specific use, the isolating switch can adopt an optical coupler, and at this moment, the input side of the bleeding module 30 is connected to the controller 20, and the output side is connected to the switch module 40, and meanwhile, the output end is also connected to the charging negative terminal C-. The bleeding module 30 is controlled by the controller 20, and is configured to bleed the charge of the switch module 40 when acquiring a control signal of the controller 20.
Further, in an embodiment of the present invention, the switch module 40 is connected between the battery pack negative terminal BAT-and the charging negative terminal C-, and the switch module 40 is further connected to the discharging module 30, and the switch module 40 is used for driving the communication state between the battery pack negative terminal BAT-and the charging negative terminal C-according to the control of the controller 20, so as to control whether the battery pack is charged by the charger. Wherein the switching module 40 adopts a power MOS transistor.
Further, in one embodiment of the present invention, the controller 20 is connected to the bleed module 30; during operation, when the charger is connected with the charging port to charge the battery pack, the controller 20 outputs a first control signal correspondingly, the switch module 40 is driven to be communicated with the battery pack and the charging port, the bleeding module 30 is controlled to stop working, the current of the corresponding charger flows to the positive terminal BAT + of the battery pack through the positive charging terminal C +, and flows to the negative charging terminal C-through the negative terminal BAT-of the battery pack and the switch module 40, and the charging loop is conducted, so that the charger charges the battery pack.
When the charger is in an overcurrent state and needs to stop charging, the controller 20 outputs a second control signal correspondingly, the switch module 40 is controlled to disconnect the battery pack and the charging port, the bleeding module 30 is controlled to work to discharge the charge in the switch module 40, so that the charger stops charging the battery pack, meanwhile, the bleeding module 30 adopts an isolating switch, the input side of the bleeding module is controlled by the controller 20, the output side can control the switch module 40, the switch module 40 is controllable during charge discharging, and meanwhile, the switch module 40 can be rapidly discharged through the set bleeding module 30, so that the damage to the switch module 40 caused by the overlong existing discharging time is avoided.
Further, in an embodiment of the present invention, the controller in the battery pack protection circuit is directly connected to the battery pack positive terminal BAT +, and works by supplying power provided by the battery pack. It can be understood that the utility model discloses in, this battery package protection circuit can also include power module, and power module one end is connected with battery package positive end BAT + for convert the power supply that the battery package provided into the work power supply, and the power module other end is connected with controller 20 and discharge module 30 respectively, with the drive rather than the controller 20 of being connected and discharge module 30 normally work. It should be noted that the voltage converted by the power module from the power supplied by the battery pack may be one voltage or a plurality of different voltages, which is determined according to the power supply requirements of the controller 20 and the bleeding module 30, and is not limited herein.
In this embodiment, because the controller and the bleeding module connected to the switch module are provided, and the bleeding module adopts the disconnecting switch, an input side of the bleeding module and the controller form a control loop, and an output side of the bleeding module and the switch module form a discharging loop, the bleeding module is controlled by the controller, so that when the controller drives the switch module to work and charge, the bleeding module is controlled to stop discharging the switch module; when the controller drives the switch module not to work and does not charge, the corresponding control release module of the controller releases the charges in the switch module quickly, so that the quick and safe discharge of the switch module is realized, and the problem of damage to the power MOS tube in the working process of the existing battery pack is solved.
Example two
Please refer to fig. 2, which is a circuit diagram of a battery pack protection circuit connected to a bleeding module according to a second embodiment of the present invention, the second embodiment has a structure substantially the same as that of the first embodiment, and the difference is that in this embodiment, the circuit further includes an anti-reverse module 50 connected to the controller 20, the bleeding module 30, and the switch module 40, respectively;
in an embodiment of the present invention, the anti-reverse module 50 is connected to the controller 20, the discharge module 30 and the switch module 40 respectively, and is used to prevent the charge of the switch module 40 from flowing back to the controller 20 and damaging the controller, and in particular, the anti-reverse module 50 can use a rectifier diode.
Further, in an embodiment of the present invention, the bleeding module 30 includes:
a bleeding unit 31 using an isolation switch connected to the switch module 40, for discharging the switch module 40; and
the control unit 32 is respectively connected with the controller 20 and the discharge unit 31, and is used for controlling the working state of the discharge unit according to the corresponding signal of the controller 20;
the switch module 40 is connected with the drain unit 31 and the reverse preventing module 50, respectively.
In practical implementation, referring to fig. 2 to 4, in an embodiment of the present invention, as shown in fig. 3, the bleeding unit 31 includes: the circuit comprises an isolating switch U1, a first resistor R1, a second resistor R2 and a first voltage stabilizing diode Z1;
the first end of the isolating switch U1 is connected with one end of a first resistor R1, the second end of the isolating switch U is connected with the control unit 32, the third end of the isolating switch U1 is connected with one end of a second resistor R2, the anode of a first voltage-stabilizing diode Z1 and one end of the switch module 40 connected with the charging port C-, the fourth end of the isolating switch U1 is connected with the other end of a second resistor R2, the cathode of the first voltage-stabilizing diode Z1 and one end of the switch module 40 connected with the anti-reverse module 50, and the other end of the first resistor R1 is connected with the power supply end VDD. The isolating switch U1 is specifically an optical coupler and is divided into an input side and an output side, the first end and the second end of the isolating switch are input sides, the third end and the fourth end are output sides, the first end of the isolating switch U1 is an anode, the second end of the isolating switch U1 is a cathode, the third end of the isolating switch U1 is an emitter, and the fourth end of the isolating switch U1 is a collector. The first resistor R1 is used for limiting current, the second resistor R2 is used for clamping and releasing, and the first voltage stabilizing diode Z1 is used for stabilizing voltage and absorbing pulse spike voltage, so that the switch module 40 is prevented from being damaged by the spike voltage. The power supply terminal VDD may be a power supply provided by the power supply module, or may also be a power supply provided by other devices, such as a power supply provided by a controller, which is set according to actual use requirements, and is not specifically limited herein.
Further, in an embodiment of the present invention, the control unit 32 includes: a first field effect transistor Q1, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a second field effect transistor Q2, a sixth resistor R6 and a seventh resistor R7;
the first end of the first field-effect transistor Q1 is connected with the bleeder unit 31, the second end of the first field-effect transistor Q1 is connected with one end of a third resistor R3 and one end of a fourth resistor R4, the third end of the first field-effect transistor Q1 and the other end of the third resistor R3 are all grounded, the other end of the fourth resistor R4 is connected with one end of a fifth resistor R5 and the first end of the second field-effect transistor Q2, the other end of the fifth resistor R5 is connected with the power supply terminal VDD, the second end of the second field-effect transistor Q2 is connected with one end of a sixth resistor R6 and one end of a seventh resistor R7, the third end of the second field-effect transistor Q2 and the other end of the sixth resistor R6 are all grounded, and the other end of the seventh resistor R7 is connected with the controller 20. The first fet Q1 and the second fet Q2 are NMOS transistors, the first terminals thereof are drains, the second terminals thereof are gates, the third terminals thereof are sources, and the first terminal of the first fet Q1 is connected to the second terminal of the isolating switch U1 in the bleeder unit 31. The third resistor R3 is used for clamping and draining, the fourth resistor R4 is used for limiting current, the fifth resistor R5 is used for limiting current, the sixth resistor R6 is used for clamping and draining, and the seventh resistor R7 is used for limiting current.
Further, in an embodiment of the present invention, the switch module 40 includes a third fet Q3, a fourth fet Q4, an eighth resistor R8, and a ninth resistor R9;
the first end of the third field-effect tube Q3 is connected with the second end of the battery pack, the second end of the third field-effect tube Q3 is connected with one end of an eighth resistor R8, the third end of the third field-effect tube Q3 is connected with the third end of the fourth field-effect tube Q4, the second end of the fourth field-effect tube Q4 is connected with one end of a ninth resistor R9, the other end of the ninth resistor R9 is connected with the bleeder module 30 and the anti-reverse module 50 respectively, and the first end of the fourth field-effect tube Q4 is connected with the bleeder module 30 and the charging port respectively. The third field-effect transistor Q3 and the fourth field-effect transistor Q4 are NMOS transistors, first ends of the third field-effect transistor Q3 and the fourth field-effect transistor Q4 are source electrodes, second ends of the third field-effect transistor Q3 and the fourth field-effect transistor Q4 are gate electrodes, third ends of the third field-effect transistor Q8 are drain electrodes, the other end of the eighth resistor R8 is connected with the fourth end of the isolating switch U1, the other end of the second resistor R2, the negative electrode of the first zener diode Z1 and the anti-reverse module 50, the first end of the fourth field-effect transistor Q4 is connected with the charging port, the third end of the isolating switch U1, one end of the second resistor R2 and the positive electrode of the first zener diode Z1, and the eighth resistor R8 and the ninth resistor R9 are used for limiting current.
Further, in an embodiment of the present invention, the anti-reverse module is an anti-reverse diode D1, a positive electrode of the anti-reverse diode D1 is connected to the controller 20, and a negative electrode of the anti-reverse diode D1 is connected to the drain module 30 and the switch module 40. Specifically, the cathode of the anti-reverse diode D1 is connected to the fourth terminal of the isolating switch U1, the other end of the second resistor R2, the cathode of the first zener diode Z1, and the other end of the eighth resistor R8.
It should be noted that, the switch module 40 provided in this embodiment is configured to be charge and discharge in the same port, that is, the charge port and the discharge port are configured in the same port, and the port is used as the charge port when connected to the charger and used as the discharge port when connected to the load. Since the ninth resistor R9 is connected to the bleeding module 30 and the anti-reverse module 50, if charging is performed, the power of the negative terminal BAT-of the battery pack can flow from the body diode of the third fet Q3 to the drain of the fourth fet Q4, and the controller 20 outputs high and low levels and drives the on state of the fourth fet Q4 after passing through the anti-reverse diode D1, so as to control whether the battery pack is charged by the charger.
It can be understood that in other embodiments of the present invention, the switch module 40 can also be set for charging and discharging, i.e. the charging port and the discharging port are set for different ports, the charger is connected to the charging port to charge the battery pack, and the battery pack discharges the load connected to the discharging port. The present invention is not particularly limited, and may be set according to actual use requirements.
Further, in an embodiment of the present invention, a specific circuit of the controller 20 is shown in fig. 4, and is not described herein again. The CHG pin of the controller 20 is connected to the seventh resistor R7 and the anti-reverse diode D1 in fig. 2, wherein, when the power module is adopted in the embodiment, the power module converts the voltage provided by the battery pack into the voltage of the power supply terminal VDD, so as to provide power for the controller 20, the bleeding unit 31 and the control unit 32 to work normally. The power supply module capable of realizing power supply voltage conversion in the prior art can be adopted, and is set according to actual use requirements, and is not specifically limited.
In normal use, as shown in fig. 2 and 3, when the charger is connected to the charging port to charge the battery pack, the controller 20 outputs a high level signal, and at this time, the high level signal flows through the anti-reverse diode D1 and the ninth resistor to the gate of the fourth fet Q4, so that the gate of the fourth fet Q4 is at a high level, and accordingly the fourth fet Q4 is correspondingly driven to be turned on, and at this time, the switch module 40 communicates with the negative terminal BAT-and the negative terminal C-of the battery pack, so that the charger charges the battery pack. Accordingly, in the bleeding module 30, the high level output by the controller 20 thereof flows to the seventh resistor R7, so that the second fet Q2 is turned on, and the fifth resistor R5 is grounded through the second fet Q2, so that the fourth resistor R4 is at a low level, and the first fet Q1 is turned off, and at this time, the corresponding isolating switch U1 does not operate, so that the bleeding module 30 does not perform charge bleeding on the switch module 40.
When the charger charges the battery pack over-current or has other faults, the controller 20 outputs a low level signal, and the switch module 40 does not have a driving voltage to drive the battery pack to work according to the above, so that the switch module 40 disconnects the battery pack from the charger, and the charger stops charging the battery pack. However, at this time, a large amount of charges exist in the gate of the fourth fet Q4 in the switch module 40 and need to be discharged, at this time, in the discharging module 30, the second fet Q2 is turned off, so that the first fet Q1 is turned on, so that the input side of the isolating switch U1 is turned on to operate, at this time, the output side of the isolating switch U1 is correspondingly turned on, a discharging loop is formed between the fourth fet Q4 and the output side of the ninth resistor R9 in the switch module 40 and the output side of the isolating switch U1, at this time, the charges on the gate of the fourth fet Q4 can be quickly discharged through the isolating switch U1, so that the switch module 40 can be quickly discharged.
EXAMPLE III
Please refer to fig. 5, which is a circuit diagram of a battery pack protection circuit connected to a bleeding module according to a third embodiment of the present invention, the circuit structure of the third embodiment is substantially the same as that of the second embodiment, and the difference is that in this embodiment, the bleeding unit 31 further includes a debugging resistor R10 connected between the third end of the isolation switch U1 and one end of the switch module 40 connected to the anti-reverse module 50. One end of the debugging resistor R10 is connected with the third end of the isolating switch U1, and the other end of the debugging resistor R10 is connected with one end of the second resistor R2, the negative electrode of the first voltage stabilizing diode Z1 and one end of the eighth resistor R8 respectively.
Further, in an embodiment of the present invention, referring to fig. 5, the circuit further includes a first capacitor C1 and a second capacitor C2.
One end of a first capacitor C1 is connected with the power supply end VDD and the other end of a first resistor R1, the other end of the first capacitor C1 is grounded, one end of a second capacitor C2 is connected with the power supply end VDD and the other end of a fifth resistor R5, and the other end of the second capacitor C2 is grounded.
In this embodiment, the leakage speed of the switch module 40 can be correspondingly controlled by setting the resistance value of the debug resistor R10, and the filtering and voltage stabilization of the power supply terminal VDD can be realized by the first capacitor C1 and the second capacitor C2.
Example four
The utility model discloses the fourth embodiment still provides a battery package protection device, including battery package and as embodiment one to embodiment three arbitrary one battery package protection circuit.
In the battery pack protection device provided by this embodiment, the controller and the bleed-off module connected to the switch module are arranged in the battery pack protection circuit, and the bleed-off module adopts the isolating switch, so that the input side of the bleed-off module and the controller form a control loop, and the output side of the bleed-off module and the switch module form a discharge loop, so that the bleed-off module is controlled by the controller, and when the controller drives the switch module to work to charge, the bleed-off module is controlled to stop discharging the switch module; when the controller drives the switch module not to work and does not charge, the corresponding control release module of the controller releases the charges in the switch module quickly, so that the quick and safe discharge of the switch module is realized, and the problem of damage to the power MOS tube in the working process of the existing battery pack is solved.
EXAMPLE five
The fifth embodiment of the present invention further provides an electric device, including the battery pack protection apparatus according to the fourth embodiment.
The controller and the bleeding module connected with the switch module are arranged in the electric equipment provided by the embodiment, the bleeding module adopts the isolating switch, the input side of the bleeding module and the controller form a control loop, the output side of the bleeding module and the switch module form a discharging loop, so that the bleeding module is controlled by the controller, and the bleeding module is controlled to stop discharging the switch module when the controller drives the switch module to work so as to charge; when the controller drives the switch module not to work and does not charge, the corresponding control release module of the controller releases the charges in the switch module quickly, so that the quick and safe discharge of the switch module is realized, and the problem of damage to the power MOS tube in the working process of the existing battery pack is solved.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A battery pack protection circuit, the circuit comprising:
the battery pack charging system comprises a controller connected with a first end of a battery pack, a discharge module which is connected with the controller and adopts an isolating switch, and a switch module connected between a second end of the battery pack and a charging port;
the input side of the bleeder module and the controller form a control loop, and the output side of the bleeder module and the switch module form a discharge loop;
when the controller outputs a first control signal, the switch module is controlled to conduct a battery pack and a charging port, and meanwhile the discharge module is controlled to stop working; and when outputting the second control signal, controlling the switch module to cut off the battery pack and the charging port, and simultaneously controlling the discharge module to discharge the switch module.
2. The battery pack protection circuit of claim 1, further comprising an anti-reverse module connected to the controller, the bleed module, and the switch module, respectively;
the reverse-flow prevention module is a reverse-flow prevention diode, the anode of the reverse-flow prevention diode is connected with the controller, and the cathode of the reverse-flow prevention diode is connected with the discharge module and the switch module.
3. The battery pack protection circuit of claim 2, wherein the bleed-off module comprises:
the bleeder unit is connected with the switch module and adopts an isolating switch, and is used for discharging the switch module; and
the control unit is respectively connected with the controller and the discharge unit and is used for controlling the working state of the discharge unit according to the corresponding signal of the controller;
the switch module is respectively connected with the discharge unit and the reverse prevention module.
4. The battery pack protection circuit of claim 3, wherein the bleed off unit comprises: the circuit comprises an isolating switch, a first resistor, a second resistor and a first voltage stabilizing diode;
the first end of the isolating switch is connected with one end of the first resistor, the second end of the isolating switch is connected with the control unit, the third end of the isolating switch is connected with one end of the second resistor, the anode of the first voltage stabilizing diode and one end of the switch module connected with the charging port, the fourth end of the isolating switch is connected with the other end of the second resistor, the cathode of the first voltage stabilizing diode and one end of the switch module connected with the anti-reverse module, and the other end of the first resistor is connected with the power supply end.
5. The battery pack protection circuit of claim 3, wherein the control unit comprises: the resistor comprises a first field effect transistor, a third resistor, a fourth resistor, a fifth resistor, a second field effect transistor, a sixth resistor and a seventh resistor;
the first end of the first field effect tube is connected with the bleeder unit, the second end of the first field effect tube is connected with one end of the third resistor and one end of the fourth resistor, the third end of the first field effect tube is grounded with the other end of the third resistor, the other end of the fourth resistor is connected with one end of the fifth resistor and the first end of the second field effect tube, the other end of the fifth resistor is connected with the power supply end, the second end of the second field effect tube is connected with one end of the sixth resistor and one end of the seventh resistor, the third end of the second field effect tube is grounded with the other end of the sixth resistor, and the other end of the seventh resistor is connected with the controller.
6. The battery pack protection circuit of claim 2, wherein the switch module comprises a third fet, a fourth fet, an eighth resistor, and a ninth resistor;
the first end of the third field effect transistor is connected with the second end of the battery pack, the second end of the third field effect transistor is connected with one end of the eighth resistor, the third end of the third field effect transistor is connected with the third end of the fourth field effect transistor, the second end of the fourth field effect transistor is connected with one end of the ninth resistor, the other end of the ninth resistor is connected with the anti-reverse module and the discharge module respectively, and the first end of the fourth field effect transistor is connected with the discharge module and the charging port respectively.
7. The battery pack protection circuit of claim 4, wherein the bleed-off unit further comprises a debug resistor connected between the third terminal of the isolation switch and a terminal to which the switch module and the anti-reverse module are connected.
8. A battery pack protection device, characterized in that the device comprises a battery pack and a battery pack protection circuit according to any one of claims 1-7.
9. An electrically powered device characterized in that it comprises a battery pack protection device according to claim 8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022494983.2U CN214380064U (en) | 2020-11-02 | 2020-11-02 | Battery pack protection circuit, device and electric equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022494983.2U CN214380064U (en) | 2020-11-02 | 2020-11-02 | Battery pack protection circuit, device and electric equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023142067A1 (en) * | 2022-01-29 | 2023-08-03 | 东莞新能安科技有限公司 | Discharge circuit, battery management system, battery pack, device and charge discharge method |
| WO2024113737A1 (en) * | 2022-11-30 | 2024-06-06 | 比亚迪股份有限公司 | Charging circuit, charging method, charger and vehicle |
-
2020
- 2020-11-02 CN CN202022494983.2U patent/CN214380064U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023142067A1 (en) * | 2022-01-29 | 2023-08-03 | 东莞新能安科技有限公司 | Discharge circuit, battery management system, battery pack, device and charge discharge method |
| WO2024113737A1 (en) * | 2022-11-30 | 2024-06-06 | 比亚迪股份有限公司 | Charging circuit, charging method, charger and vehicle |
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