CN111082495A - BMS power supply system and control method thereof - Google Patents
BMS power supply system and control method thereof Download PDFInfo
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- CN111082495A CN111082495A CN202010015457.5A CN202010015457A CN111082495A CN 111082495 A CN111082495 A CN 111082495A CN 202010015457 A CN202010015457 A CN 202010015457A CN 111082495 A CN111082495 A CN 111082495A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
Abstract
The invention relates to a BMS power supply system and a control method thereof, wherein the BMS power supply system comprises: the battery pack, a first connector connected with the battery pack, a second connector connected with the first connector in a pluggable manner, and a load module or a charging module connected with the second connector; the battery pack comprises a battery pack, a controller, a signal detection unit, a switch driving unit and a discharge switch, wherein the signal detection unit is connected with the controller and the first connector; when the second connector is connected with the first connector, the first connector outputs a trigger level to trigger the signal detection unit to generate a detection level, and the controller receives the detection level and generates a control level to control the switch driving unit to drive the discharge switch to be conducted. The invention can effectively avoid the ignition of the battery pack in the using and accessing process.
Description
Technical Field
The present invention relates to the field of power supply technologies, and in particular, to a BMS power supply system and a control method thereof.
Background
With the increase of environmental awareness, the use of green energy is more extensive in the fields of power automobiles and the like. Among them, lithium batteries are used as green energy sources and are increasingly widely used. However, in the use process of a general lithium battery, because frequent charging or discharging is required, when a load or a charger is connected in the discharging or charging process, if a voltage exists at a connection port, a large sparking spark can be generated in the connection moment, so that the user experience is poor, and the interface is easy to age due to frequent sparking, thereby greatly reducing the service life of the lithium battery.
Disclosure of Invention
The present invention is directed to a BMS power supply system and a control method thereof, which address the above-mentioned drawbacks of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: constructing a BMS power supply system; the method comprises the following steps: the battery pack comprises a battery pack, a first connector connected with the battery pack, a second connector connected with the first connector in a pluggable mode, and a load module or a charging module connected with the second connector;
the battery pack comprises a battery pack, a controller, a signal detection unit, a switch driving unit and a discharge switch, wherein the signal detection unit is connected with the controller and the first connector;
when the second connector is connected with the first connector, a trigger level is output through the first connector to trigger the signal detection unit to generate a detection level, and the controller receives the detection level and generates a control level to control the switch driving unit to drive the discharge switch to be conducted.
Preferably, the first connector includes:
the first pin is connected with the anode of the battery pack, the second pin is connected with the signal detection unit, and the third pin is connected with the discharge switch;
the second connector includes:
a first pin which can be correspondingly connected with a first pin of the first connector, a second pin which can be correspondingly connected with a second pin of the first connector, and a third pin which can be correspondingly connected with a third pin of the first connector;
the second pin of the second connector is connected with the first pin of the second connector.
Preferably, the signal detection unit comprises a first voltage regulator tube, a second voltage regulator tube, a switch tube and a first resistor;
the anode of the first voltage-regulator tube is connected with the first end of the switch tube, and the cathode of the first voltage-regulator tube is connected with the second pin of the first connector;
the anode of the second voltage-stabilizing tube is grounded, and the cathode of the second voltage-stabilizing tube is connected with the first end of the switch tube;
the first resistor is connected with the second voltage-regulator tube in parallel;
the second end of the switch tube is grounded, the third end of the switch tube is connected with a power supply, and the third end of the switch tube is connected with the controller.
Preferably, the switch tube includes an MOS tube, a gate of the MOS tube is connected to an anode of the first voltage regulator tube and a cathode of the second voltage regulator tube, respectively, a source of the MOS tube is grounded, and a drain of the MOS tube is connected to the power supply and the controller, respectively.
Preferably, the first connector includes:
the first pin is connected with the anode of the battery pack, the second pin and the third pin of the signal detection unit are connected, and the fourth pin of the discharge switch is connected;
the second connector includes:
a first pin which can be correspondingly connected with a first pin of the first connector, a second pin which can be correspondingly connected with a second pin of the first connector, a third pin which can be correspondingly connected with the second pin of the first connector, and a fourth pin which can be correspondingly connected with a fourth pin of the first connector;
the second pin of the second connector is connected with the third pin of the second connector.
Preferably, the signal detection circuit comprises a second resistor, a third resistor and a capacitor;
a first end of the second resistor is connected with a power supply, and a second end of the second resistor is connected with a second pin of the first connector;
a first end of the third resistor is connected with the controller, and a second end of the third resistor is connected with the second pin of the first connector;
the first end of the capacitor is connected with the controller, the second end of the capacitor is connected with the third pin of the first connector, and the second end of the capacitor is grounded.
The present invention also provides a BMS power system control method based on the BMS power system according to any one of the above, comprising the steps of:
maintaining the discharge switch in an off state;
when the first connection interface is correspondingly connected with the second connection interface, outputting a trigger level through the first connector to trigger the signal detection unit to generate a detection level;
the controller receives the detection level and generates a control level to control the switch driving unit to drive the discharge switch to be conducted.
The BMS power supply system and the control method thereof have the following beneficial effects: can effectively avoid the battery package to strike sparks in the use access process.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic diagram of functional modules of a BMS power supply system of the present invention;
fig. 2 is a circuit schematic of an embodiment of a BMS power supply system of the present invention;
fig. 3 is a circuit schematic of another embodiment of a BMS power supply system of the present invention;
fig. 4 is a circuit schematic of another embodiment of a BMS power supply system of the present invention;
fig. 5 is a schematic circuit diagram of another embodiment of a BMS power supply system of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, in a first embodiment of a BMS power supply system of the present invention, comprises: the battery pack 100, the first connector 200 connected with the battery pack 100, the second connector 300 connected with the first connector 200 in a pluggable manner, and the load module or charging module 400 connected with the second connector 300; the battery pack 100 includes a battery pack 110, a controller 120, a signal detection unit 150 connecting the controller 120 and the first connector 200, a switch driving unit 130 connecting the controller 120, and a discharge switch 140 connecting the switch driving unit 130 and the battery pack 110; when the second connector 300 is connected to the first connector 200, and when the second connector 300 is connected to the first connector 200, the trigger level is output through the first connector 200 to trigger the signal detection unit 150 to generate the detection level, and the controller 120 receives the detection level and generates the control level to control the switch driving unit 130 to drive the discharge switch 140 to be turned on. Specifically, in the BMS power supply system, the battery pack 110 is connected to the load module or the charging module 400 through the first connector 200 and the second connector 300 during normal use, so that the discharge of the load module is accomplished, or the battery pack 110 is charged through the charging module. The first connector 200 and the second connector 300 are connected in a pluggable manner, and the connection status thereof can be detected by the signal detection unit 150 connected to the first connector 200. That is, when the first connector 200 is not connected to the second connector 300, the signal detection unit 150 does not detect the corresponding level signal, i.e., the trigger level. In some embodiments, a default level signal, such as a default low level signal, may also be set. When the controller 120 does not detect the corresponding level signal or detects the default level signal, it generates the control level to control the switch driving unit 130 to generate the driving level to turn on the discharging switch 140, and through this process, it can be realized that before the load module or the charging module 400 is connected, the output port of the battery pack 110, i.e. the first connector 200, does not output, and only after the first connector 200 is connected with the second connector 300, it turns on the conducting loop formed by the first connector 200 and the second connector 300, so that it can effectively avoid the occurrence of sparking when the load module or the charging module 400 is connected under the condition that the port is electrified. It is understood that the discharge switch 140 herein may be a combination of various MOS switches disposed on the control charging loop and the discharge loop path in the battery pack 100. It can also be understood that the signal detection unit 150 detects a trigger level, which is a corresponding high-low level signal output by the first connector 200 pin. The controller 120 may be a BMS controller within a BMS power supply.
As shown in fig. 2, in some embodiments, the first connector 200 includes: a first pin connected to the positive electrode of the battery pack 110, a second pin connected to the signal detection unit 150, and a third pin connected to the discharge switch 140; the second connector 300 includes: a first pin correspondingly connectable to the first pin of the first connector 200, a second pin correspondingly connectable to the second pin of the first connector 200, and a third pin correspondingly connectable to the third pin of the first connector 200; the second pin of the second connector 300 is connected to the first pin of the second connector 300. Specifically, a first pin of the first connector 200 is connected to the positive electrode of the battery pack 110, a second pin of the first connection is connected to the signal detection unit 150, and a third pin of the first connector 200 is connected to the discharge switch 140, i.e., a control loop corresponding to charging and discharging. The first pin, the second pin, and the third pin of the second connector 300 and the first pin, the second pin, and the third pin of the first connector 200 may be correspondingly connected. The first pin and the second pin of the second connector 300 are connected, and after the connection, the first pin and the second pin are connected to the positive pole of the load module or the charging module 400, and the third pin of the second connector 300 is connected to the negative pole of the load module or the charging module 400. When the first connector 200 is connected to the second connector 300, the positive electrode of the battery pack 110 forms a loop with the signal detection circuit through the first pin of the first connector 200 and the first pin of the second connector 300, the second pin of the first connector 200, that is, the second pin of the first connector 200 has a voltage level of the battery pack 110, that is, a trigger level output by the second pin of the first connector 200, the controller 120 detects the voltage level through the signal detection unit 150, confirms that the first connector 200 and the second connector 300 are connected, that is, a charging module or a discharging load is connected, the controller 120 outputs a control level to enable the switch driving unit 130 to output a single-level-driven discharging switch 140 to be turned on, and at this time, the negative electrode of the load module or the charging module 400 forms a loop with the positive electrode of the battery pack 110, the battery pack 110 normally discharges the load module or the charging module normally charges the battery pack 110.
As shown in fig. 3, in an embodiment, the signal detecting unit 150 includes a first resistor connected to a first voltage regulator, a second voltage regulator, a switch tube and a first resistor; the positive electrode of the first voltage-stabilizing tube is connected with the first end of the switch tube, and the negative electrode of the first voltage-stabilizing tube is connected with the second pin of the first connector 200; the anode of the second voltage-stabilizing tube is grounded, and the cathode of the second voltage-stabilizing tube is connected with the first end of the switch tube; the first resistor is connected with the second voltage-regulator tube in parallel; the second terminal of the switch tube is grounded, the third terminal of the switch tube is connected to a power supply, and the third switch of the switch tube is connected to the controller 120. Specifically, the signal detection circuit includes a voltage regulator ZD1, i.e., a first voltage regulator, a voltage regulator ZD2, i.e., a second voltage regulator, and a switch tube, wherein the positive output of the battery pack 110 is connected to the signal detection input terminal through a second pin of the first connector 200, and after passing through a voltage division circuit formed by the voltage regulator ZD1, the voltage regulator ZD2, and a resistor R2, i.e., a first resistor, connected in parallel with the voltage regulator ZD2, a control voltage is generated at a switch control terminal, i.e., a first terminal, of the switch tube, and the control voltage drives the switch tube to be turned on, and when the signal detection output terminal outputs a corresponding detection level, the controller 120 generates a corresponding control level according to the detection level to control the switch driving unit 130 to drive the discharge switch 140 to. In one embodiment, when the switch tube is turned off, the signal detection output end outputs a high level, that is, the signal detection output end can be connected with a 3.3V power supply through a pull-up resistor R2, when the switch tube is turned on, the signal detection output end and the turned-on switch tube are pulled down to be grounded, and a low level is output at the signal detection output end.
In an embodiment, the switching tube may include a MOS tube Q1, a gate of the MOS tube Q1 is connected to an anode of the first regulator tube and a cathode of the second regulator tube, respectively, a source of the MOS tube Q1 is grounded, and a drain of the MOS tube Q1 is connected to the power supply and the controller 120, respectively. Specifically, the switching tube may adopt a MOS transistor Q1, wherein a gate of the MOS transistor Q1 is connected to a negative electrode of the ZD1, a source of the MOS transistor Q1 is grounded, and a drain of the MOS transistor Q1 is connected to the controller 120 through the signal detection output terminal.
As shown in fig. 4, in one embodiment, the first connector 200 includes: a first pin connected to the positive electrode of the battery pack 110, a second pin and a third pin connected to the signal detection unit 150, and a fourth pin connected to the discharge switch 140; the second connector 300 includes: a first pin which can be correspondingly connected with a first pin of the first connector 200, a second pin which can be correspondingly connected with a second pin of the first connector 200, a third pin which can be correspondingly connected with the second pin of the first connector 200, and a fourth pin which can be correspondingly connected with four pins of the first connector 200; the second pin of the second connector 300 is connected to the third pin of the second connector 300. Specifically, a first pin of the first connector 200 is connected to the positive electrode of the battery pack 110, a second pin and a third pin of the first connector are connected to the signal detection unit 150, and a fourth pin of the first connector 200 is connected to the discharge switch 140, i.e., a control loop of charging and discharging corresponding thereto. The first, second, third and fourth pins of the second connector 300 and the first, second, third and fourth pins of the first connector 200 may be correspondingly connected. The first pin of the second connector 300 is connected to the positive pole of the load module or the charging module 400, the second pin and the third pin of the second connector 300 are connected, and the fourth pin of the second connector 300 is connected to the negative pole of the load module or the charging module 400. When the first connector 200 is connected to the second connector 300, the positive electrode of the battery pack 110 supplies power to the load module or the charging module 400 through the first pin of the first connector 200 and the first pin of the second connector 300, the signal detection unit 150 forms a detection loop through the second pin of the first connector 200, the second pin of the second connector 300, the third pin of the second connector 300 and the third pin of the first connector 200, the signal detection unit 150 acquires a detection signal according to the detection loop, that is, a trigger level output by the third pin of the first connector 200, and after the controller 120 detects the voltage level through the signal detection unit 150, it is determined that the first connector 200 and the second connector 300 are connected, that is, the load module or the charging module 400 is connected, the controller 120 outputs a control level to make the switch driving unit 130 output a single-level driving discharge switch 140 to be turned on, at this time, the negative electrode of the load module or the charging module 400 and the positive electrode of the battery pack 110 form a loop, and the battery pack 110 normally discharges the load module or the charging module normally charges the battery pack 110.
As shown in fig. 5, in an embodiment, the signal detection circuit includes a second resistor, a third resistor and a capacitor; a first end of the second resistor is connected to a power supply, and a second end of the second resistor is connected to a second pin of the first connector 200; a first end of the third resistor is connected to the controller 120, and a second end of the third resistor is connected to the second pin of the first connector 200; the first terminal of the capacitor is connected to the controller 120, the second terminal of the capacitor is connected to the third pin of the first connector 200, and the second terminal of the capacitor is grounded. Specifically, the signal detection circuit includes a resistor RX1, i.e., a second resistor, a resistor RX2, i.e., a third resistor, and a capacitor CX 1. When the first connector 200 is not connected to the second connector 300, the signal detection output terminal outputs a high level to the controller 120 because it is connected to a pull-up power source through the pull-up resistor RX1, i.e., when the signal detection input terminal has no signal input. The pull-up power may be provided by a power supply. When the first connector 200 is connected to the second connector 300, the second pin and the third pin of the first connector 200 are connected through the second connector 300, the signal detection input terminal is pulled down to ground, and a low level is output at the signal detection output terminal.
In addition, a BMS power system control method of the present invention is based on the BMS power system according to any one of the above, and the process thereof includes: the discharge switch 140 is kept in an off state; when the first connection interface is correspondingly connected with the second connection interface, the first connector 200 outputs a trigger level to trigger the signal detection unit 150 to generate a detection level; the controller 120 receives the detection level and generates a control level to control the switch driving unit 130 to drive the discharge switch 140 to be turned on. Specifically, in the BMS power supply system, the battery pack 110 is connected to the load module through the first connector 200 and the second connector 300 during normal use, so that the discharge of the load module is accomplished, or the battery pack 110 is charged through the charging module. The first connector 200 and the second connector 300 are connected in a pluggable manner, and the connection status thereof can be detected by the signal detection unit 150 connected to the first connector 200. That is, when the first connector 200 is not connected to the second connector 300, the signal detection unit 150 does not detect the corresponding level signal, i.e., the trigger level. In some embodiments, a default level signal, such as a default low level signal, may also be set. When the controller 120 does not detect the corresponding level signal or detects the default level signal, it generates the control level to control the switch driving unit 130 to generate the driving level to turn on the discharging switch 140, and through this process, it can be realized that before the load module or the charging module 400 is connected, the output port of the battery pack 110, i.e. the first connector 200, does not output, and only after the first connector 200 is connected with the second connector 300, it turns on the conducting loop formed by the first connector 200 and the second connector 300, so that it can effectively avoid the occurrence of sparking when the load module or the charging module 400 is connected under the condition that the port is electrified. It is understood that the discharge switch 140 herein may be a combination of various MOS switches disposed on the control charging loop and the discharge loop path in the battery pack 100. It can also be understood that the signal detection unit 150 detects a trigger level, which is a corresponding high-low level signal output by the first connector 200 pin.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (7)
1. A BMS power supply system, comprising: the battery pack comprises a battery pack, a first connector connected with the battery pack, a second connector connected with the first connector in a pluggable mode, and a load module or a charging module connected with the second connector;
the battery pack comprises a battery pack, a controller, a signal detection unit, a switch driving unit and a discharge switch, wherein the signal detection unit is connected with the controller and the first connector;
when the second connector is connected with the first connector, a trigger level is output through the first connector to trigger the signal detection unit to generate a detection level, and the controller receives the detection level and generates a control level to control the switch driving unit to drive the discharge switch to be conducted.
2. The BMS power supply system of claim 1, wherein the first connector comprises:
the first pin is connected with the anode of the battery pack, the second pin is connected with the signal detection unit, and the third pin is connected with the discharge switch;
the second connector includes:
a first pin which can be correspondingly connected with a first pin of the first connector, a second pin which can be correspondingly connected with a second pin of the first connector, and a third pin which can be correspondingly connected with a third pin of the first connector;
the second pin of the second connector is connected with the first pin of the second connector.
3. The BMS power supply system according to claim 2, wherein the signal detection unit comprises a first resistor connected to a first voltage regulator tube, a second voltage regulator tube, a switching tube;
the anode of the first voltage-regulator tube is connected with the first end of the switch tube, and the cathode of the first voltage-regulator tube is connected with the second pin of the first connector;
the anode of the second voltage-stabilizing tube is grounded, and the cathode of the second voltage-stabilizing tube is connected with the first end of the switch tube;
the first resistor is connected with the second voltage-regulator tube in parallel;
the second end of the switch tube is grounded, the third end of the switch tube is connected with a power supply, and the third end of the switch tube is connected with the controller.
4. The BMS power supply system according to claim 3, wherein the switching tube comprises MOS tubes, gates of the MOS tubes are respectively connected with the anode of the first voltage regulator tube and the cathode of the second voltage regulator tube, sources of the MOS tubes are grounded, and drains of the MOS tubes are respectively connected with the power supply and the controller.
5. The BMS power supply system of claim 1, wherein the first connector comprises:
the first pin is connected with the anode of the battery pack, the second pin and the third pin of the signal detection unit are connected, and the fourth pin of the discharge switch is connected;
the second connector includes:
a first pin which can be correspondingly connected with a first pin of the first connector, a second pin which can be correspondingly connected with a second pin of the first connector, a third pin which can be correspondingly connected with the second pin of the first connector, and a fourth pin which can be correspondingly connected with a fourth pin of the first connector;
the second pin of the second connector is connected with the third pin of the second connector.
6. The BMS power supply system according to claim 5, wherein the signal detection circuit comprises a second resistor, a third resistor, and a capacitor;
a first end of the second resistor is connected with a power supply, and a second end of the second resistor is connected with a second pin of the first connector;
a first end of the third resistor is connected with the controller, and a second end of the third resistor is connected with the second pin of the first connector;
the first end of the capacitor is connected with the controller, the second end of the capacitor is connected with the third pin of the first connector, and the second end of the capacitor is grounded.
7. A BMS power supply system control method based on the BMS power supply system according to any one of claims 1 to 6, characterized by comprising:
maintaining the discharge switch in an off state;
when the first connection interface is correspondingly connected with the second connection interface, outputting a trigger level through the first connector to trigger the signal detection unit to generate a detection level;
the controller receives the detection level and generates a control level to control the switch driving unit to drive the discharge switch to be conducted.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010015457.5A CN111082495A (en) | 2020-01-07 | 2020-01-07 | BMS power supply system and control method thereof |
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| CN202010015457.5A CN111082495A (en) | 2020-01-07 | 2020-01-07 | BMS power supply system and control method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113203959A (en) * | 2021-03-24 | 2021-08-03 | 深圳市拓邦锂电池有限公司 | Anti-ignition battery system and anti-ignition device |
| 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 |
| CN114520438A (en) * | 2022-02-23 | 2022-05-20 | 深圳中科捷飞科技有限公司 | Charging device and control method |
-
2020
- 2020-01-07 CN CN202010015457.5A patent/CN111082495A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113203959A (en) * | 2021-03-24 | 2021-08-03 | 深圳市拓邦锂电池有限公司 | Anti-ignition battery system and anti-ignition device |
| 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 |
| CN114520438A (en) * | 2022-02-23 | 2022-05-20 | 深圳中科捷飞科技有限公司 | Charging device and control method |
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