CN213367449U - Ignition prevention circuit of battery management system and battery pack - Google Patents
Ignition prevention circuit of battery management system and battery pack Download PDFInfo
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- CN213367449U CN213367449U CN202022045955.2U CN202022045955U CN213367449U CN 213367449 U CN213367449 U CN 213367449U CN 202022045955 U CN202022045955 U CN 202022045955U CN 213367449 U CN213367449 U CN 213367449U
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Abstract
The utility model is suitable for an electronic circuit technical field provides a circuit and group battery are prevented striking sparks by battery management system, and the circuit includes: the voltage detection module is connected with the negative end of the external interface of the battery pack and is used for detecting a voltage signal of the negative end; the input end of the load detection module is connected with the output end of the voltage detection module; the input end of the charge and discharge control module is connected with the output end of the load detection module, and the output end of the charge and discharge control module is connected with a negative pole main loop of a battery management system of the battery pack and used for controlling the negative pole of the battery management system to be turned off. This embodiment just charges and discharges external equipment after confirming that the battery package is connected external interface and external equipment, the phenomenon of striking sparks can not appear, instantaneous heavy current when avoiding the battery package to connect the load the phenomenon of striking sparks appear and ablate the battery package and damage battery package and external equipment, each components and parts of protection circuit and equipment even.
Description
Technical Field
The utility model belongs to the technical field of the electronic circuit, especially, relate to a circuit and group battery are prevented striking sparks by battery management system.
Background
With the development of battery power technology, the capacity, safety, health state and endurance of a battery are increasingly important concerns, a Battery Management System (BMS) is a system for monitoring and controlling the battery, collected battery information is fed back to a user in real time, parameters are adjusted according to the collected information, and the performance of the battery is fully exerted.
When the output of a battery pack in a battery management system on the market is connected with a load, the load is usually connected with a large load capacitor, so that the phenomenon of 'striking sparks' through large current can be caused instantaneously when a power connector is plugged and pulled, the connector is easy to ablate, faults such as poor contact of a plug and the like are easily caused for a long time, and the service life of the connector is shortened.
SUMMERY OF THE UTILITY MODEL
The utility model provides a circuit of striking sparks is prevented to battery management system aims at solving the problem that the phenomenon of striking sparks appears in battery management system connection load.
The utility model discloses a realize like this, a circuit of striking sparks is prevented to battery management system, include:
the voltage detection module is connected with the negative end of the external interface of the battery pack and is used for detecting a voltage signal of the negative end;
the input end of the load detection module is connected with the output end of the voltage detection module;
and the input end of the charge and discharge control module is connected with the output end of the load detection module, and the output end of the charge and discharge control module is connected with a negative pole main loop of the battery management system and used for controlling the negative pole of the battery management system to be turned off.
Furthermore, the load detection module comprises a first resistor and a first triode;
one end of the first resistor is connected with the first voltage end, and the other end of the first resistor is connected with the collector electrode of the first triode;
the collector of the first triode is also connected with the input end of the charge-discharge control module, the emitter of the first triode is grounded, and the base of the first triode is connected with the output end of the voltage detection module.
Furthermore, the voltage detection module comprises a second resistor, one end of the second resistor is connected with the base electrode of the first triode, and the other end of the second resistor is connected with the negative electrode end.
Furthermore, the voltage detection module further comprises a voltage stabilizing diode, wherein the anode of the voltage stabilizing diode is connected with the base electrode of the first triode, and the cathode of the voltage stabilizing diode is connected with one end of the second resistor.
Furthermore, the charge and discharge control module comprises a control chip, a charge control switch tube and a discharge control switch tube;
the charging control switch tube and the discharging control switch tube are arranged on a negative pole main loop of the battery management system, a first path of control signal end of the control chip is connected with a control end of the charging control switch tube, and a second path of control signal end of the control chip is connected with a control end of the discharging control switch tube.
Furthermore, the charge and discharge control module further comprises a first switch tube driving module and a second switch tube driving module;
the input end of the first switch tube driving module is connected with the first path of control signal end, and the output end of the first switch tube driving module is connected with the control end of the charging control switch tube;
the input end of the second switch tube driving module is connected with the second path of control signal end, and the output end of the second switch tube driving module is connected with the control end of the discharge control switch tube.
In a second aspect, the present application also provides a battery pack including the battery management system anti-sparking circuit as described above.
The embodiment of the utility model provides a because detect the voltage signal of the negative pole end of battery package external tapping through voltage detection module, the voltage of its negative pole end changes when the battery package external tapping is connected with external equipment, the voltage signal that voltage detection module detected is received to load detection module and output to charge-discharge control module's input, charge-discharge control module and battery package's battery management system's positive negative pole return circuit are connected, a negative pole for output signal control battery management system according to load detection module turns off, just charge-discharge to external equipment after confirming battery package external tapping is connected with external equipment, the phenomenon of striking sparks can not appear, the phenomenon of striking sparks appears in the instantaneous heavy current when avoiding battery package to connect the load and the phenomenon of burning sparks battery package external tapping damages battery package and external equipment even, each components and parts of protection circuit and equipment.
Drawings
Fig. 1 is a schematic block diagram of an anti-strike circuit for a battery management system according to the present invention;
fig. 2 is a schematic diagram of a specific circuit structure of an embodiment of an ignition prevention circuit of a battery management system provided by the present invention;
fig. 3 is a schematic diagram of a specific circuit structure of another embodiment of the ignition prevention circuit of the battery management system provided by the present invention.
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.
The voltage detection module is used for detecting a voltage signal of a cathode end of an external interface of a battery pack, when the external interface of the battery pack is connected with external equipment, the voltage of the cathode end of the external interface of the battery pack changes, the load detection module receives the voltage signal detected by the voltage detection module and outputs the voltage signal to an input end of the charge-discharge control module, the charge-discharge control module is connected with a positive circuit and a negative circuit of a battery management system of the battery pack, the negative circuit is used for controlling the cathode of the battery management system to be turned off according to an output signal of the load detection module, the external equipment is charged and discharged after the external interface of the battery pack is confirmed to be connected with the external equipment, the ignition phenomenon can not occur, the ignition phenomenon is avoided when instantaneous large current generated when the battery pack is connected with the load, the battery pack is ablated and the.
Example one
In some alternative embodiments, referring to fig. 1, fig. 1 is a block diagram of an anti-sparking circuit of a battery management system according to an embodiment of the present application.
As shown in fig. 1, the present application provides an anti-ignition circuit of a battery management system, which includes a voltage detection module 1, a load detection module 2, and a charge and discharge control module 3.
The voltage detection module 1 is connected with a negative electrode end P-of the external interface of the battery pack and is used for detecting a voltage signal of the negative electrode end P-; the input end of the load detection module 2 is connected with the output end of the voltage detection module 1; the input end of the charge and discharge control module 3 is connected with the output end of the load detection module 2, and the output end of the charge and discharge control module 3 is connected with the negative pole main loop of the battery management system and used for controlling the negative pole of the battery management system to be turned off.
In implementation, the positive and negative electrode circuits of the battery management system include a positive electrode main circuit and a negative electrode main circuit, wherein the positive electrode main circuit is connected with a positive electrode B + of the battery, the negative electrode main circuit is connected with a negative electrode B-of the battery, and the output protection of the battery pack of the battery management system adopts a negative electrode turn-off mode, and the charge and discharge control module 3 can control the on and off of the negative electrode main circuit of the battery management system, for example, a triode or a field effect transistor is connected to the negative electrode main circuit, and the on and off of the negative electrode main circuit is controlled by controlling the on and off of the triode or the field effect transistor. In implementation, the external interface of the battery pack is used for connecting with an external device, for example, the external interface of the battery pack adopts a USB interface, which can be connected with a connector for charging or connected with an external device for discharging, the external interface of the battery pack includes a positive terminal P + and a negative terminal P-, the voltage detection module 1 is connected with the negative terminal P-of the external interface of the battery pack for detecting a voltage signal of the negative terminal P-, the load detection module 2 is connected with the voltage detection module 1 and the charge and discharge control module 3 for outputting a preset voltage signal to the charge and discharge control module 3 according to the voltage signal detected by the voltage detection module 1, so that the charge and discharge control module 3 can determine whether to access a load according to the preset voltage signal, for example, when the load is not accessed, the voltage signal of the negative terminal P-is at a low level because the negative electrode of the battery management system is turned off, the load detection module 2 outputs a preset voltage signal as a low level according to the low level voltage signal, the charge and discharge control module 3 judges that the load is not connected according to the low level of the preset voltage signal, and continues to maintain the negative pole to be switched off, when the load is connected, the ignition phenomenon cannot occur due to the negative pole switching off of the battery management system, at this time, the voltage signal of the negative pole end P-is pulled high by the load to be a high level, the load detection module 2 outputs the preset voltage signal as a high level according to the high level voltage signal, the charge and discharge control module 3 judges that the load is connected according to the high level of the preset voltage signal, the negative pole is switched off and keeps supplying power to the load, and the ignition phenomenon cannot occur.
The voltage detection module 1 is used for detecting a voltage signal of a negative electrode end p-of an external interface of a battery pack, the voltage of the negative electrode end p-of the external interface of the battery pack changes when the external interface of the battery pack is connected with an external device, a load detection module 2 receives the voltage signal detected by the voltage detection module 1 and outputs the voltage signal to a signal input end Vin of a charge and discharge control module 3, the charge and discharge control module 3 is connected with a positive electrode loop and a negative electrode loop of a battery management system of the battery pack, for controlling the negative pole of the battery management system to be turned off according to the output signal of the load detection module 2, the external equipment is charged and discharged after the external interface of the battery pack is confirmed to be connected with the external equipment, the ignition phenomenon can not occur, the ignition phenomenon is avoided when instantaneous heavy current generated when the battery pack is connected with a load, the external interface of the battery pack is ablated, and even the battery pack and the external equipment are damaged, and each component and equipment of a protection circuit are protected.
Example two
In some optional embodiments, please refer to fig. 2, fig. 2 is a schematic circuit structure diagram of an embodiment of an anti-ignition circuit of a battery management system according to the present application.
As shown in fig. 2, the load detection module 2 includes a first resistor R1 and a first transistor Q1, one end of the first resistor R1 is connected to the first voltage terminal VCC, the other end of the first resistor R1 is connected to the collector of the first transistor Q1, the collector of the first transistor Q1 is further connected to the input of the charge and discharge control module 3, the emitter of the first transistor Q1 is grounded, and the base of the first transistor Q1 is connected to the output of the voltage detection module 1.
In implementation, the input end of the charge and discharge control module 3 is a signal input end Vin, the first voltage end VCC outputs a working voltage of the circuit, when the output end of the voltage detection module 1 outputs a low level, the base of the first triode Q1 is a low level, the first triode Q1 is cut off, the first voltage end VCC outputs a high level to the signal input end Vin of the charge and discharge control module 3, and when the output end of the voltage detection module 1 outputs a high level, the base of the first triode Q1 is a high level, the first triode Q1 is turned on, and the signal input end Vin of the charge and discharge control module 3 is grounded.
In some embodiments, the voltage detection module 1 includes a second resistor R2, one end of the second resistor R2 is connected to the base of the first transistor Q1, and the other end of the second resistor R2 is connected to the negative terminal P-.
In implementation, the negative electrode of the battery management system is turned off, if the load RL is not accessed, the negative electrode end P-is at a low level, so that the base electrode of the first triode Q1 is at a low level, the first triode Q1 is cut off, the first voltage end VCC outputs a high level to the charge and discharge control module 3, and the charge and discharge control module 3 judges that the load RL is not accessed and controls to keep the negative electrode turned off; when the load RL is accessed, because the negative electrode is switched off, large current cannot be generated between the negative electrode and the load RL, the ignition phenomenon cannot occur, at the moment, the voltage signal of the negative electrode end P & lt- & gt is pulled to be high level by the load RL capacitor and the resistor, namely, the base electrode of the first triode Q1 is high level, the first triode Q1 is switched on, the signal input end Vin of the charge and discharge control module 3 is grounded to be low level, the charge and discharge control module 3 detects that the load RL is accessed to start the negative electrode to be switched off, power supply is kept for the load RL, and the ignition phenomenon cannot occur.
EXAMPLE III
In some optional embodiments, please refer to fig. 3, fig. 3 is a schematic circuit structure diagram of another embodiment of the ignition prevention circuit of the battery management system of the present application.
As shown in fig. 3, the voltage detecting module 1 further includes a zener diode D1, an anode of the zener diode D1 is connected to the base of the first transistor Q1, and a cathode of the zener diode D1 is connected to one end of the second resistor R2.
In implementation, the zener diode D1 is arranged between the second resistor R2 and the base of the first triode Q1, so that the damage to the triode or other components and the protection circuit caused by the transient high voltage or the transient high current generated when the load RL is connected can be effectively prevented.
Example four
In some optional embodiments, the charge and discharge control module 3 includes a control chip MCU, a charge control switch M1 and a discharge control switch M2, the charge control switch M1 and the discharge control switch M2 are disposed on a negative main circuit of the battery management system, a first path of control signal terminal of the control chip MCU is connected to a control terminal of the charge control switch M1, and a second path of control signal terminal of the control chip MCU is connected to a control terminal of the discharge control switch M2.
In implementation, the charge control switch tube M1 and the discharge control switch tube M2 may be transistors or MOS (Metal-Oxide-Semiconductor transistors), the charge control switch tube M1 and the discharge control switch tube M2 are N-type MOS transistors, the source of the charge control switch tube M1 is connected to the negative electrode B-of the battery, the gate of the charge control switch tube M1 is connected to the first path of control signal end of the control chip MCU, the drain of the charge control switch tube M1 is connected to the drain of the discharge control switch tube M2, the gate of the discharge control switch tube M2 is connected to the second path of control signal end of the control chip MCU, and the source of the discharge control switch tube M2 is connected to the negative electrode p-. The charging control switch tube M1 and the discharging control switch tube M2 are controlled to be switched on and off by the control chip MCU, so that the output protection of the battery pack of the battery management system is switched off by the negative electrode.
EXAMPLE five
In some embodiments, the charge and discharge control module 3 further includes a first switch tube driving module and a second switch tube driving module, an input end of the first switch tube driving module is connected to the first path of control signal end, an output end of the first switch tube driving module is connected to the control end of the charge control switch tube M1, an input end of the second switch tube driving module is connected to the second path of control signal end, and an output end of the second switch tube driving module is connected to the control end of the discharge control switch tube M2. The first switch tube driving module and the second switch tube driving module adopt driving control circuits of switch tubes, the control chip MCU respectively outputs control signals to the first switch tube driving module and the second switch tube driving module, and then the first switch tube driving module and the second switch tube driving module respectively output driving signals to the charging control switch tube M1 and the discharging control switch tube M2 so as to control the on and off of the charging control switch tube M1 and the discharging control switch tube M2.
EXAMPLE six
In some alternative embodiments, the present application further provides a battery pack including a battery management system anti-strike circuit as described above.
In implementation, the battery pack comprises a plurality of battery packs connected in series or in parallel, a voltage signal of a negative end of the external interface of the battery pack is detected by the voltage detection module 1, the voltage of the negative end of the external interface of the battery pack changes when the external interface of the battery pack is connected with external equipment, the load detection module 2 receives the voltage signal detected by the voltage detection module 1 and outputs the voltage signal to a signal input end of the charge-discharge control module 3, the charge-discharge control module 3 is connected with a positive and negative loop of a battery management system of the battery pack and is used for controlling the negative turn-off of the battery management system according to an output signal of the load detection module 2, the external equipment is charged and discharged after the external interface of the battery pack is confirmed to be connected with the external equipment, the ignition phenomenon can not occur, the ignition phenomenon caused by instantaneous large current when the battery pack is connected with a load RL can be avoided, the, and protecting each component and equipment of the circuit.
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 (7)
1. A battery management system anti-strike circuit, comprising:
the voltage detection module is connected with the negative end of the external interface of the battery pack and used for detecting a voltage signal of the negative end;
the input end of the load detection module is connected with the output end of the voltage detection module;
and the input end of the charge and discharge control module is connected with the output end of the load detection module, and the output end of the charge and discharge control module is connected with a negative pole main loop of the battery management system and used for controlling the negative pole of the battery management system to be turned off.
2. The battery management system anti-strike circuit of claim 1, wherein the load detection module includes a first resistor and a first transistor;
one end of the first resistor is connected with a first voltage end, and the other end of the first resistor is connected with a collector electrode of the first triode;
and the collector electrode of the first triode is also connected with the input end of the charge and discharge control module, the emitter electrode of the first triode is grounded, and the base electrode of the first triode is connected with the output end of the voltage detection module.
3. The battery management system anti-sparking circuit according to claim 2, wherein the voltage detection module comprises a second resistor, one end of the second resistor is connected with the base of the first triode, and the other end of the second resistor is connected with the negative terminal.
4. The battery management system anti-sparking circuit of claim 3, wherein the voltage detection module further includes a zener diode, an anode of the zener diode being connected to the base of the first transistor, and a cathode of the zener diode being connected to one end of the second resistor.
5. The battery management system anti-sparking circuit according to claim 1, wherein the charge-discharge control module comprises a control chip, a charge control switch tube and a discharge control switch tube;
the charging control switch tube and the discharging control switch tube are arranged on a negative electrode main loop of the battery management system, a first path of control signal end of the control chip is connected with a control end of the charging control switch tube, and a second path of control signal end of the control chip is connected with a control end of the discharging control switch tube.
6. The battery management system anti-sparking circuit according to claim 5, wherein the charge-discharge control module further comprises a first switching tube driving module and a second switching tube driving module;
the input end of the first switch tube driving module is connected with the first path of control signal end, and the output end of the first switch tube driving module is connected with the control end of the charging control switch tube;
the input end of the second switch tube driving module is connected with the second path of control signal end, and the output end of the second switch tube driving module is connected with the control end of the discharge control switch tube.
7. A battery pack characterized in that it comprises a battery management system anti-strike circuit according to any of claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022045955.2U CN213367449U (en) | 2020-09-17 | 2020-09-17 | Ignition prevention circuit of battery management system and battery pack |
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| CN202022045955.2U CN213367449U (en) | 2020-09-17 | 2020-09-17 | Ignition prevention circuit of battery management system and battery pack |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113595169A (en) * | 2021-06-18 | 2021-11-02 | 浙江高泰昊能科技有限公司 | BMS (battery management system) ignition prevention method and device, computer equipment and storage medium |
| CN113734330A (en) * | 2021-08-24 | 2021-12-03 | 宁波道一能源技术有限公司 | Battery pack protection method and protection circuit of two-wheeled electric vehicle |
| CN113937374A (en) * | 2021-09-30 | 2022-01-14 | 无锡职业技术学院 | Parallel battery pack and control method |
-
2020
- 2020-09-17 CN CN202022045955.2U patent/CN213367449U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113595169A (en) * | 2021-06-18 | 2021-11-02 | 浙江高泰昊能科技有限公司 | BMS (battery management system) ignition prevention method and device, computer equipment and storage medium |
| CN113734330A (en) * | 2021-08-24 | 2021-12-03 | 宁波道一能源技术有限公司 | Battery pack protection method and protection circuit of two-wheeled electric vehicle |
| CN113734330B (en) * | 2021-08-24 | 2022-11-01 | 宁波道一能源技术有限公司 | Battery pack protection method and protection circuit of two-wheeled electric vehicle |
| CN113937374A (en) * | 2021-09-30 | 2022-01-14 | 无锡职业技术学院 | Parallel battery pack and control method |
| CN113937374B (en) * | 2021-09-30 | 2023-10-27 | 无锡职业技术学院 | Parallel battery pack and control method |
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