A BMS power system and a control method thereof

Abstract

The application relates to a BMS power supply system and a control method thereof, which comprises a battery pack, a first connector connected with the battery pack, a second connector in pluggable connection with the first connector, a load module or a charging module connected with the second connector; the battery pack comprises a battery group, a controller, a signal detection unit connected with the controller and the first connector, a switch driving unit connected with the controller, and a discharge switch connected with the switch driving unit and the battery group; 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, the controller receives the detection level and generates a control level to control the switch driving unit to drive the discharge switch to be turned on. The application can effectively avoid the occurrence of sparking of the battery pack in the use access process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply, more particularly, to a BMS power supply system and a control method thereof. BACKGROUND

[0002] With the increase of environmental awareness, the use of green energy is more widely used in the field of power vehicles. Among them, lithium batteries as green energy, their application is also more and more widely used. But in the usual process of using lithium batteries, because it needs to be charged or discharged frequently, and in the process of discharging or charging, when accessing the load or charger, if the connection port has voltage, the moment of access will produce a larger spark, which makes the user experience poor, and frequent sparking is easy to cause the interface to age, causing the service life of the lithium battery to be greatly reduced. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a BMS power supply system and a control method thereof in view of the above technical defects of the prior art.

[0004] The technical scheme adopted by the present application to solve its technical problem is: a BMS power supply system is constructed; comprising: a battery pack, a first connector connected to the battery pack, a second connector pluggably connected to the first connector, a load module or a charging module connected to the second connector;

[0005] The battery pack comprises: a battery pack, a controller, a signal detection unit connected to the controller and the first connector, a switch driving unit connected to the controller, and a discharge switch connected to the switch driving unit and the battery pack.

[0006] When the second connector is connected to 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 conduct.

[0007] Preferably, the first connector comprises:

[0008] a first pin connected to the positive electrode of the battery pack, a second pin connected to the signal detection unit, and a third pin connected to the discharge switch.

[0009] The second connector comprises:

[0010] a first pin corresponding to the first pin of the first connector, a second pin corresponding to the second pin of the first connector, and a third pin corresponding to the third pin of the first connector.

[0011] The second pin of the second connector is connected to the first pin of the second connector.

[0012] Preferably, the signal detection unit comprises a first voltage stabilizing tube, a second voltage stabilizing tube, a switch tube and a first resistor;

[0013] The positive pole of the first voltage stabilizing tube is connected to the first end of the switch tube, and the negative pole of the first voltage stabilizing tube is connected to the second pin of the first connector;

[0014] The positive pole of the second voltage stabilizing tube is grounded, and the negative pole of the second voltage stabilizing tube is connected to the first end of the switch tube;

[0015] The first resistor is connected in parallel to the second voltage stabilizing tube;

[0016] The second end of the switch tube is grounded, the third end of the switch tube is connected to a power supply, and the third end of the switch tube is connected to the controller.

[0017] Preferably, the switch tube comprises a MOS tube, the gate of the MOS tube is connected to the positive pole of the first voltage stabilizing tube and the negative pole of the second voltage stabilizing tube respectively, the source of the MOS tube is grounded, and the drain of the MOS tube is connected to the power supply and the controller respectively.

[0018] Preferably, the first connector comprises:

[0019] The first pin connected to the positive pole of the battery pack, the second pin and the third pin connected to the signal detection unit, and the fourth pin connected to the discharge switch;

[0020] The second connector comprises:

[0021] The first pin corresponding to the first pin of the first connector, the second pin corresponding to the second pin of the first connector, the third pin corresponding to the second pin of the first connector, and the fourth pin corresponding to the fourth pin of the first connector;

[0022] The second pin of the second connector is connected to the third pin of the second connector.

[0023] Preferably, the signal detection circuit comprises a second resistor, a third resistor and a capacitor;

[0024] The first end of the second resistor is connected to a power supply, and the second end of the second resistor is connected to the second pin of the first connector;

[0025] The first end of the third resistor is connected to the controller, and the second end of the third resistor is connected to the second pin of the first connector;

[0026] The first end of the capacitor is connected to the controller, the second end of the capacitor is connected to the third pin of the first connector, and the second end of the capacitor is grounded.

[0027] The application also constructs a BMS power supply system control method based on the BMS power supply system as claimed in any one of the above, and the process thereof comprises:

[0028] The discharge switch is kept in an off state;

[0029] When the first connection interface and the second connection interface are connected correspondingly, the first connector outputs a trigger level to trigger the signal detection unit to generate a detection level;

[0030] The controller receives the detection level and generates a control level to control the switch driving unit to drive the discharge switch to be turned on.

[0031] The BMS power supply system and the control method thereof according to the application have the following beneficial effects: the battery pack can be effectively prevented from sparking during the use connection process. BRIEF DESCRIPTION OF DRAWINGS

[0032] The application will be further described below with reference to the accompanying drawings and embodiments. In the drawings:

[0033] Figure 1 is a functional module schematic diagram of the BMS power supply system according to the application;

[0034] Figure 2 is a circuit principle diagram of an embodiment of the BMS power supply system according to the application;

[0035] Figure 3 is a circuit principle diagram of another embodiment of the BMS power supply system according to the application;

[0036] Figure 4 is a circuit principle diagram of another embodiment of the BMS power supply system according to the application;

[0037] Figure 5 is a circuit principle diagram of another embodiment of the BMS power supply system according to the application. DETAILED DESCRIPTION

[0038] In order to have a clearer understanding of the technical features, objectives and effects of the application, the specific embodiments of the application will be described in detail below with reference to the accompanying drawings.

[0039] As Figure 1As shown, in a first embodiment of the BMS power supply system of the present application, it comprises: a battery pack 100, a first connector 200 connected to the battery pack 100, a second connector 300 pluggably connected to the first connector 200, and a load module or a charging module 400 connected to the second connector 300; the battery pack 100 comprises: a battery pack 110, a controller 120, a signal detection unit 150 connected to the controller 120 and the first connector 200, a switch driving unit 130 connected to the controller 120, and a discharge switch 140 connected to the switch driving unit 130 and the battery pack 110; when the second connector 300 is connected to the first connector 200, a trigger level is output through the first connector 200 to trigger the signal detection unit 150 to generate a detection level, and 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, during normal use, 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, so as to discharge the load module or charge the battery pack 110 through the charging module. Among them, the first connector 200 and the second connector 300 are pluggably connected to each other, and the connection state 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 can also be set, for example, a default low level signal. When the controller 120 does not detect the corresponding level signal or detects the default level signal, it generates a control level to control the switch driving unit 130 to generate a driving level to make the discharge switch 140 off. 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, has no output, and only after the first connector 200 is connected to the second connector 300, the first connector 200 and the second connector 300 form a conduction loop, so as to effectively avoid the occurrence of sparking when the load module or the charging module 400 is connected in the case of port electrification. It can be understood that the discharge switch 140 here can be a combination of various MOS tube switches arranged in the control charging loop and the discharge loop of the battery pack 100. It can also be understood that the signal detection unit 150 detects the trigger level, which is the corresponding high-low level signal output by the pin of the first connector 200. The controller 120 can be a BMS controller in the BMS power supply.

[0040] As Figure 2As shown, in some embodiments, the first connector 200 includes a first pin connected to the positive pole 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 corresponding to the first pin of the first connector 200, a second pin corresponding to the second pin of the first connector 200, and a third pin corresponding 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, the first pin of the first connector 200 is connected to the positive pole of the battery pack 110, the second pin of the first connector 200 is connected to the signal detection unit 150, and the third pin of the first connector 200 is connected to the control loop of the discharge switch 140. The first pin, the second pin, and the third pin of the second connector 300 can be connected to the first pin, the second pin, and the third pin of the first connector 200, respectively. The first pin and the second pin of the second connector 300 are connected, and the connected pins 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 and the second connector 300 are connected, the positive pole of the battery pack 110 forms a loop with the first pin of the first connector 200 and the first pin of the second connector 300, the second pin of the second connector 300, and the second pin of the first connector 200, i.e., the second pin of the first connector 200 has the voltage level of the battery pack 110 at this time, which is equivalent to the trigger level output by the second pin of the first connector 200. After the controller 120 detects the voltage level through the signal detection unit 150, it is confirmed that the first connector 200 and the second connector 300 have been connected, i.e., the charging module or the discharge load has been connected, and the controller 120 outputs a control level to make the switch driving unit 130 output a drive level to drive the discharge switch 140 to be conductive. At this time, the negative pole of the load module or the charging module 400 forms a loop with the positive pole of the battery pack 110, and the battery pack 110 normally discharges the load module or the charging module normally charges the battery pack 110.

[0041] As Figure 3As shown, in an embodiment, the signal detection unit 150 includes a first voltage stabilizing tube, a second voltage stabilizing tube, a switch tube and a first resistor. The positive pole of the first voltage stabilizing tube is connected to the first end of the switch tube, and the negative pole of the first voltage stabilizing tube is connected to the second pin of the first connector 200. The positive pole of the second voltage stabilizing tube is grounded, and the negative pole of the second voltage stabilizing tube is connected to the first end of the switch tube. The first resistor is connected in parallel with the second voltage stabilizing tube. The second end of the switch tube is grounded, the third end of the switch tube is connected to a power supply, and the third end of the switch tube is connected to the controller 120. Specifically, the signal detection circuit includes the voltage stabilizing tube ZD1 (first voltage stabilizing tube), the voltage stabilizing tube ZD2 (second voltage stabilizing tube) and the switch tube. The positive pole output of the battery pack 110 is connected to the signal detection input end through the second pin of the first connector 200, and after passing through the voltage stabilizing tube ZD1, the voltage stabilizing tube ZD2 and the voltage divider circuit composed of the resistor R2 (first resistor) connected in parallel with the voltage stabilizing tube ZD2, a control voltage is generated at the switch control end (first end) of the switch tube. The control voltage drives the switch tube to turn on, and when the corresponding detection level is output at the signal detection output end, 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 turn on. In an embodiment, when the switch tube is turned off, the signal detection output end outputs a high level, i.e., it can be connected to a 3.3V power supply through the pull-up resistor R2. When the switch tube is turned on, the signal detection output end is pulled down to ground through the turned-on switch tube, and the signal detection output end outputs a low level.

[0042] In an embodiment, the switch tube can include a MOS tube Q1. The gate of the MOS tube Q1 is connected to the positive pole of the first voltage stabilizing tube and the negative pole of the second voltage stabilizing tube, respectively. The source of the MOS tube Q1 is grounded, and the drain of the MOS tube Q1 is connected to the power supply and the controller 120, respectively. Specifically, the switch tube can use the MOS tube Q1, in which the gate of the MOS tube Q1 is connected to the negative pole of the voltage stabilizing tube ZD1, the source of the MOS tube Q1 is grounded, and the drain of the MOS tube Q1 is connected to the controller 120 through the signal detection output end.

[0043] As shown in FIG. 1, the controller 120 is connected to the switch driving unit 130 and the signal detection unit 150. The controller 120 is connected to the switch driving unit 130 through the signal detection output end, and the controller 120 is connected to the signal detection unit 150 through the switch control end of the switch tube. Figure 4As shown, in an embodiment, the first connector 200 comprises: a first pin connected to the positive pole 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 comprises: a first pin corresponding to the first pin of the first connector 200, a second pin corresponding to the second pin of the first connector 200, a third pin corresponding to the third pin of the first connector 200, and a fourth pin corresponding to the fourth pin 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, the first pin of the first connector 200 is connected to the positive pole of the battery pack 110, the second pin and the third pin of the first connector 200 are connected to the signal detection unit 150, and the fourth pin of the first connector 200 is connected to the discharge switch 140, i.e., the control loop of the corresponding charge and discharge. The first pin, the second pin, the third pin, and the fourth pin of the second connector 300 can be connected to the first pin, the second pin, the third pin, and the fourth pin of the first connector 200, respectively. 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 pole 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, and the signal detection unit 150 obtains a detection signal according to the detection loop, i.e., the trigger level output by the third pin of the first connector 200. After the controller 120 detects the voltage level through the signal detection unit 150, it is confirmed that the first connector 200 and the second connector 300 have been connected, i.e., the load module or the charging module 400 has been connected, the controller 120 outputs a control level to make the switch driving unit 130 output a driving level to drive the discharge switch 140 to be conductive. At this time, the negative pole of the load module or the charging module 400 forms a loop with the positive pole of the battery pack 110, and the battery pack 110 normally discharges the load module or the charging module normally charges the battery pack 110.

[0044] As Figure 5As shown, 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, a second end of the second resistor is connected to the second pin of the first connector 200; a first end of the third resistor is connected to the controller 120, a second end of the third resistor is connected to the second pin of the first connector 200; a first end of the capacitor is connected to the controller 120, a second end of the capacitor is connected to the third pin of the first connector 200, and the second end of the capacitor is grounded. Specifically, the signal detection circuit includes a resistor RX1 (the second resistor), a resistor RX2 (the third resistor) and a capacitor CX1. When the first connector 200 and the second connector 300 are not connected, the signal detection output end outputs a high level to the controller 120 because it is connected to a pull-up power supply through the pull-up resistor RX1, i.e. there is no signal input to the signal detection input end at this time. The pull-up power supply can be provided by the power supply. When the first connector 200 and the second connector 300 are connected, the second pin and the third pin of the first connector 200 are communicated through the second connector 300, the signal detection input end is pulled down to the ground, and a low level is output at the signal detection output end.

[0045] In addition, the BMS power supply system control method of the application is based on the BMS power supply system of any one of the above, and the process includes: keeping the discharge switch 140 in an off state; when the first connection interface and the second connection interface are connected correspondingly, outputting a trigger level through the first connector 200 to trigger the signal detection unit 150 to generate a detection level; and 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 conduct. 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 in the normal use process, so as to realize discharging of the load module, or charging of the battery pack 110 through the charging module. The first connector 200 and the second connector 300 are pluggable to each other, and the connection state 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, that is, the trigger level. In some embodiments, a default level signal, for example, a default low level signal, can also be set. When the controller 120 does not detect the corresponding level signal or detects the default level signal, it generates a control level to control the switch driving unit 130 to generate a driving level to make the discharge switch 140 conduct. Through the above process, the output port of the battery pack 110, that is, the first connector 200, has no output before the load module or the charging module 400 is connected, and the first connector 200 and the second connector 300 are only connected to form a conduction loop after the first connector 200 is connected to the second connector 300, so as to effectively avoid the occurrence of sparking when the load module or the charging module 400 is connected in the case of port electrification. It can be understood that the discharge switch 140 herein can be a combination of various MOS tube switches arranged in the control charging loop and the discharge loop of the battery pack 100. It can also be understood that the signal detection unit 150 detects the trigger level, which is the corresponding high-low level signal output by the pin of the first connector 200.

[0046] It can be understood that the above embodiments only express the preferred embodiments of the application, which are described in detail and specifically, but cannot be understood as a limitation on the scope of the patent of the application; it should be pointed out that, for ordinary skilled persons in the art, the above technical features can be freely combined without departing from the concept of the application, and some modifications and improvements can be made, which all belong to the protection scope of the application; therefore, any equivalent transformation and modification within the scope of the claims of the application shall belong to the scope of the claims of the application.

Claims

1. A BMS power system control method, characterized by, The BMS power supply system comprises a battery pack, a first connector connected to the battery pack, a second connector pluggably connected to the first connector, a load module or a charging module connected to the second connector; The battery pack comprises a battery group, a controller, a signal detection unit connected to the controller and the first connector, a switch driving unit connected to the controller, and a discharge switch connected to the switch driving unit and the battery group; The signal detection unit comprises a first voltage stabilizing tube, a second voltage stabilizing tube, a switch tube and a first resistor, the first connector comprises a first pin connected to the positive electrode of the battery group, a second pin connected to the negative electrode of the first voltage stabilizing tube, and a third pin connected to the discharge switch, the second connector comprises a first pin corresponding to the first pin of the first connector, a second pin corresponding to the second pin of the first connector, and a third pin corresponding to the third pin of the first connector, and the second pin of the second connector is connected to the first pin of the second connector; The positive electrode of the first voltage stabilizing tube is connected to the first end of the switch tube, the positive electrode of the second voltage stabilizing tube is grounded, the negative electrode of the second voltage stabilizing tube is connected to the first end of the switch tube, the first resistor is connected in parallel to the second voltage stabilizing tube, the second end of the switch tube is grounded, the third end of the switch tube is connected to a power supply, and the third end of the switch tube is connected to the controller; The control method comprises: keeping the discharge switch in an off state; when the first connection interface and the second connection interface are connected correspondingly, 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 turned on.

2. The BMS power system control method of claim 1, wherein, The switch tube comprises a MOS tube, the gate of the MOS tube is connected to the positive electrode of the first voltage stabilizing tube and the negative electrode of the second voltage stabilizing tube respectively, the source of the MOS tube is grounded, and the drain of the MOS tube is connected to the power supply and the controller respectively.

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