Battery management system power supply system and method

Abstract

The invention discloses a power supply system and method for a battery management system, and the power supply system comprises the following steps: a lead-acid battery supplies ON power to the battery management system through an ignition switch to form a first ON power line, and transmits an ON electric signal to a standby power supply timing controller; the standby power supply timing controller provides constant power for the battery management system by closing a normally open pin of the five-pin relay to form a second constant power circuit; when the second constant power line is connected and reaches the set time, the power supply of the standby power supply timing controller is automatically cut off; and the battery management system is connected with the high-voltage contactor through a hard wire so as to control the closing and opening of the high-voltage contactor. The standby power supply is provided for the battery management system through the standby power supply timing controller, and the battery management system can normally control the disconnection of the high-voltage contactor as long as the lead-acid battery of the whole vehicle is electrified, so that the damage risk of on-load cutoff is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of mining vehicles, and in particular to a battery management system power supply system and method. Background Art

[0002] As the market size of mining trucks continues to expand, they are restricted by the use environment of mining trucks. The users of mining trucks are all employees who have not received long-term training. Improper operation often causes damage to some electrical components of the vehicles. For example, the driver directly turns off the handle switch without turning off the key, causing frequent problems with high-voltage contactor adhesion.

[0003] The existing battery management system for electric mining vehicles is powered by normal power and ON power. Due to the relatively low level of network management of mining vehicles, it is necessary to turn off the handle switch after parking to prevent the lead-acid battery from feeding. However, when we are debugging or parking the vehicle, we often violate regulations. For example, when the vehicle is heating or cooling, the ignition key is not turned off, that is, the ON power is not disconnected. In order to simply turn off the power, the driver directly turns off the power. At this time, the ON power and normal power of the battery management system are abnormally powered off at the same time, causing the contactor to be cut off with load and stick. When a fault occurs, we often replace the contactor and provide standardized training for the driver, which consumes a lot of manpower, material resources and financial resources. Summary of the invention

[0004] The object of the present invention is to provide a battery management system power supply system and method, which is used to solve the technical problem in the prior art that the handle switch is abnormally closed when the vehicle's ON power is not disconnected, causing the ON power and the normal power to be abnormally powered off at the same time, thereby causing the lead-acid battery to feed power and the contactor to be cut off under load and stick.

[0005] The present invention solves the above problems through the following technical solutions:

[0006] A battery management system power supply system comprises: a backup power timing controller, a lead-acid battery, a handle switch, an ignition switch, a battery management system, a five-pin relay and a high-voltage contactor, wherein the five pins of the backup power timing controller are respectively connected to three pins of the five-pin relay, the ignition switch and the lead-acid battery through hard wires, the lead-acid battery, the handle switch, the normally closed pin of the five-pin relay, the battery management system and the ignition switch are connected in sequence to form a loop, and the hard wire connecting the handle switch and the five-pin relay is connected to the hard wire connecting one pin of the backup power timing controller and the normally closed pin of the five-pin relay;

[0007] The lead-acid battery supplies normal power to the battery management system through the handle switch and the five-pin relay, and also supplies normal power to the backup power timing controller to form a first normal power circuit;

[0008] The lead-acid battery supplies ON power to the battery management system through the ignition switch to form a first ON power circuit, and at the same time transmits the ON power signal to the backup power timing controller;

[0009] The backup power timing controller provides normal power to the battery management system by closing the normally open pin of the five-pin relay to form a second normal power circuit; and when the second normal power circuit is connected and the set time is reached, the power supply of the backup power timing controller is automatically cut off;

[0010] The battery management system is connected to the high-voltage contactor through a hard line to control the closing and opening of the high-voltage contactor.

[0011] As a further improvement of the present invention, the second normal electric circuit is connected when the ignition switch is not turned off and the handle switch is directly disconnected.

[0012] As a further improvement of the present invention, the set time is the time required to ensure that the battery management system disconnects the high-voltage contactor.

[0013] As a further improvement of the present invention, the five pins of the backup power supply timing controller include: pin No. 1, pin No. 2, pin No. 3, pin No. 4 and pin No. 5, wherein pin No. 1 is connected to the normally closed pin of the five-pin relay, pin No. 2 is connected to the lead-acid battery, pin No. 3 is connected to the normally open pin of the five-pin relay, pin No. 4 is connected to the battery management system through the ignition switch, and pin No. 5 is connected to the five-pin relay.

[0014] As a further improvement of the present invention, the backup power timing controller is provided with a MOS tube and a timer, so that the MOS tube is controlled by the timer to automatically disconnect the power supply of the internal power device, thereby ensuring low power consumption of the backup power timing controller.

[0015] At the same time, the present invention also solves the above problems through the following technical solutions:

[0016] A battery management system power supply method is implemented by the battery management system power supply system as described above, comprising:

[0017] S1, detect whether the first normal power circuit and the first ON power circuit of the battery management system are powered at the same time, if not, enter S2;

[0018] S2, the backup power timing controller starts the control program, controls the second normal power line and the first ON power line to be powered at the same time, so that the second normal power line supplies normal power to the battery management system, and enters S3;

[0019] S3, the battery management system starts the instruction to disconnect the high-voltage contactor, and at the same time, the backup power timing controller starts the timing program. After the set time is reached, the lead-acid battery connection that supplies power to the backup power timing controller is cut off.

[0020] As a further improvement of the present invention, S2 also includes: detecting whether the five-pin relay is closed, and if not, detecting whether pins 3 and 5 of the backup power timing controller output power; if so, the battery management system is normally powered; if it times out, reporting a fault and cutting off the connection of the lead-acid battery that supplies power to the backup power timing controller.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0022] The present invention can effectively avoid the problem of lead-acid battery power feeding and contactor load disconnection and adhesion caused by abnormal power failure of ON power and normal power at the same time. The backup power supply timing controller is used to provide backup power supply for the battery management system. As long as the lead-acid battery of the whole vehicle has power, the battery management system can normally control the disconnection of the high-voltage contactor, avoiding the risk of damage caused by load disconnection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a block diagram of a battery management system power supply system of the present invention;

[0024] Figure 2 This is a flow chart of a power supply method for a battery management system of the present invention.

[0025] Reference numerals: 1, backup power supply timing controller; 11, pin 1; 12, pin 2;

[0026] 13. Pin 3; 14. Pin 4; 15. Pin 5; 2. Lead-acid battery; 3. Handle switch; 4. Ignition switch; 5. Battery management system; 6. Five-pin relay; 7. High-voltage contactor. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0028] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0029] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or display that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed but may include other steps or elements not explicitly listed or inherent to such process, method, product, or display.

[0032] The following will be combined Figure 1-2 , a battery management system power supply system and method involved in the embodiments of the present application are described in detail. It is worth noting that the following embodiments are only used to explain the present application and do not constitute a limitation on the present application.

[0033] Embodiment 1:

[0034] Combined with Figure 1 As shown, a battery management system power supply system includes: a backup power timing controller 1, a lead-acid battery 2, a handle switch 3, an ignition switch 4, a battery management system 5, a five-pin relay 6 and a high-voltage contactor 7, etc. The five pins of the backup power timing controller 1 are respectively connected to three pins of the five-pin relay, the ignition switch 4, and the lead-acid battery 2 through hard wires, the lead-acid battery 2, the handle switch 3, the normally closed pin of the five-pin relay 6, the battery management system 5 and the ignition switch 4 are connected in sequence to form a loop, and the hard wire connecting the handle switch 3 and the five-pin relay 6 is connected to the hard wire connecting one pin of the backup power timing controller 1 and the normally closed pin of the five-pin relay 6;

[0035] The lead-acid battery 2 supplies normal power to the battery management system 5 and the backup power timing controller 1 through the handle switch 3 and the five-pin relay 6 to form a first normal power circuit. The lead-acid battery 2 supplies ON power to the battery management system 5 through the ignition switch 4 to form a first ON power circuit, and transmits the ON power signal to the backup power timing controller 1. The backup power timing controller 1 provides normal power to the battery management system by attracting the relay through the five-pin relay 6 in a specific scenario, forming a second normal power circuit; and when the second normal power circuit is connected and the set time is reached, the power supply of the backup power timing controller 1 is automatically cut off; the battery management system 5 is connected to the high-voltage contactor 7 through a hard line to control the closing and opening of the high-voltage contactor.

[0036] In this embodiment, the backup power supply timing controller 1 is provided with a built-in MOS tube and a timer. When the timer is started, the MOS tube automatically disconnects the power supply of the internal power device when the set time is reached. The MOS tube is controlled by the timer to automatically disconnect the power supply of the internal power device, thereby ensuring the low power consumption of the backup power supply timing controller and avoiding long-term power use causing lead-acid battery feeding.

[0037] The five-pin relay is a normally closed relay. Under normal circumstances, the normally closed contact is the normal power of the lead-acid battery. When the coil is energized, it will jump to the normally open contact.

[0038] The battery management system is a controller that opens and closes the high-voltage contactor. This case is just an example. The actual battery management system controls multiple contactors with the same principle.

[0039] The handle switch is mainly used to disconnect the power supply of all electrical appliances in the vehicle after the mine car stops to prevent the lead-acid battery from being powered up.

[0040] The five pins of the backup power supply timing controller include: pin 11, pin 2, pin 12, pin 3, pin 13, pin 4, and pin 5, wherein pin 1 is connected to the normally closed pin of the five-pin relay 6, pin 2 is connected to the lead-acid battery 2, pin 3 is connected to the normally open pin of the five-pin relay 6, pin 4 is connected to the battery management system through the ignition switch, and pin 5 is connected to the five-pin relay 6.

[0041] Under normal circumstances, the battery management system 5 is provided with ON power by the lead-acid battery 2 through the ignition switch 4, and the lead-acid battery 2 is provided with normal power through the handle switch 3 and the five-pin relay 6. The normal order of powering off the whole vehicle is that the key of the whole vehicle is turned off first, and the battery management system 5 is disconnected from the ON power. After the battery management system 5 detects that the ON power is disconnected, it cuts off the high-voltage contactor 7 of the whole vehicle. Turn off the handle switch, the normal power of the battery management system is lost, and the electrical appliances of the whole vehicle are not damaged. When the key is not turned off, the handle switch is directly turned off. At this time, the ON power and normal power of the battery management system are lost at the same time, and the high-voltage contactor 7 is subject to the risk of adhesion when the load is cut off. In this embodiment, the second normal power circuit is connected when the ignition switch is not turned off and the handle switch is directly disconnected. When the handle switch 3 is directly disconnected, the backup power timing controller 1 detects that the normal power hard line 1 and the ON power hard line 4 are both powered off, and the internal control program is started. The battery management system 5 hardware is energized, and the five-pin relay 6 is controlled to attract the hard line 3 connected by the backup power timing controller to provide the battery management system 5 with normal power. At this time, the battery management system 5 detects that the ON power is disconnected, and enters the high-voltage contactor 7 disconnection control. At the same time, the backup power timing controller 1 enters the start timing program. When the set time is reached, that is, the time required for the battery management system to disconnect the high-voltage contactor, the backup power timing controller No. 3 hard line power supply is automatically cut off. This ensures that the high-voltage contactor does not cause the risk of on-load switching adhesion due to the simultaneous loss of ON power and normal power, and does not cause lead-acid battery feeding due to the backup power timing controller working all the time.

[0042] Embodiment 2:

[0043] Combined with Figure 2 As shown, a battery management system power supply method is implemented by a battery management system power supply system described in Example 1, and the specific steps include:

[0044] S1, detect whether the first normal power circuit and the first ON power circuit of the battery management system are powered at the same time, that is, whether the first pin 11 and the fourth pin 14 of the backup power timing controller 1 are powered at the same time, if not, enter S2;

[0045] S2, the backup power timing controller starts the control program, controls the second normal power circuit and the first ON power circuit to have power at the same time, that is, controls the third pin 13 and the fifth pin 15 to output power, so that the second normal power circuit provides normal power to the battery management system, and enters S3;

[0046] Preferably, S2 also includes: detecting whether the five-pin relay 6 is closed, and if not, detecting whether pins 3 and 5 of the backup power timing controller output power; if so, the battery management system is normally powered and enters S3; if it times out, reporting a fault and cutting off the connection of the lead-acid battery 2 that powers the backup power timing controller 1.

[0047] S3, the battery management system starts the instruction to disconnect the high-voltage contactor, and at the same time, the backup power timing controller starts the timing program. After the set time is reached, the lead-acid battery 2 that supplies power to the backup power timing controller 1 is disconnected.

[0048] The present invention has the following advantages:

[0049] 1. The battery management system is normally powered by a five-pin relay, which is a mature component and does not require additional cost.

[0050] 2. The five-pin relay is controlled by the backup power timing controller to connect and switch to ensure the continuity and stability of the backup power supply of the battery management system;

[0051] 3. The standby power timing controller has a timed shutdown function. At the same time, when the normal power and ON power of the lead-acid battery are restored, it has a start-up function to avoid the standby power timing controller consuming power for a long time after the vehicle stops, causing the lead-acid battery to be fed;

[0052] 4. The backup power controller uses the existing lead-acid battery of the vehicle to draw power, without the need for additional power supply, thus saving the cost of the vehicle;

[0053] 5. The backup power timing controller can be inherited into the vehicle controller, battery management system or other vehicle controllers, or it can exist independently.

[0054] Although the present invention is described herein with reference to the illustrative embodiments of the present invention, the above embodiments are only preferred embodiments of the present invention, and the embodiments of the present invention are not limited to the above embodiments. It should be understood that those skilled in the art can design many other modifications and embodiments, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A battery management system power supply system, characterized in that: include: A backup power timing controller, a lead-acid battery, a handle switch, an ignition switch, a battery management system, a five-pin relay and a high-voltage contactor, wherein the five pins of the backup power timing controller are respectively connected to three pins of the five-pin relay, the ignition switch and the lead-acid battery through hard wires, the lead-acid battery, the handle switch, the normally closed pin of the five-pin relay, the battery management system and the ignition switch are connected in sequence to form a loop, and the hard wire connecting the handle switch and the five-pin relay is connected to the hard wire connecting one pin of the backup power timing controller and the normally closed pin of the five-pin relay; The lead-acid battery supplies normal power to the battery management system through the handle switch and the five-pin relay, and also supplies normal power to the backup power timing controller to form a first normal power circuit; The lead-acid battery supplies ON power to the battery management system through the ignition switch to form a first ON power circuit, and at the same time transmits the ON power signal to the backup power timing controller; The backup power timing controller provides normal power to the battery management system by closing the normally open pin of the five-pin relay, forming a second normal power circuit; And when the second normal power line is connected and the set time is reached, the power supply of the backup power timing controller is automatically cut off; The battery management system is connected to the high-voltage contactor through a hard line to control the closing and opening of the high-voltage contactor.

2. A battery management system power supply system according to claim 1, characterized in that: The second normal electric circuit is connected when the ignition switch is not turned off and the handle switch is directly disconnected.

3. A battery management system power supply system according to claim 1, characterized in that: The set time is the time required to ensure that the battery management system disconnects the high-voltage contactor.

4. A battery management system power supply system according to claim 1, characterized in that: The five pins of the backup power timing controller include: pin 1, pin 2, pin 3, pin 4 and pin 5, wherein pin 1 is connected to the normally closed pin of the five-pin relay, pin 2 is connected to the lead-acid battery, pin 3 is connected to the normally open pin of the five-pin relay, pin 4 is connected to the battery management system through the ignition switch, and pin 5 is connected to the five-pin relay.

5. A battery management system power supply system according to any one of claims 1 to 4, characterized in that: The backup power timing controller is provided with a MOS tube and a timer, so as to control the MOS tube to automatically disconnect the power supply of the internal power device through the timer, thereby ensuring the low power consumption of the backup power timing controller.

6. A battery management system power supply method, implemented by a battery management system power supply system according to any one of claims 1 to 5, characterized in that: include: S1, detect whether the first normal power circuit and the first ON power circuit of the battery management system are powered at the same time, if not, enter S2; S2, the backup power timing controller starts the control program, controls the second normal power line and the first ON power line to be powered at the same time, so that the second normal power line supplies normal power to the battery management system, and enters S3; S3, the battery management system starts the instruction to disconnect the high-voltage contactor, and at the same time, the backup power timing controller starts the timing program. After the set time is reached, the lead-acid battery connection that supplies power to the backup power timing controller is cut off.

7. A battery management system power supply method according to claim 6, characterized in that: The S2 also includes: detecting whether the five-pin relay is closed, if not, detecting whether the third and fifth pins of the backup power timing controller output power; if so, the battery management system is normally powered; if it times out, reporting a fault and cutting off the connection of the lead-acid battery that supplies power to the backup power timing controller.

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