A lead-acid battery protection device for commercial vehicles

Abstract

A kind of commercial vehicle lead-acid battery protection device, by protection circuit module, the power line one connecting protection circuit module with vehicle battery positive output, the power line two being connected with vehicle normal power line positive terminal, signal line one being connected with vehicle battery negative terminal, signal line two being connected with vehicle power switch output end;Protection circuit of protection circuit module 24V IN connects power line one, 24V OUT connects power line two;MOSFET switch Q1 is used to control 24V_OUT loop on-off;MCU unit is used to drive MOSFET switch Q1 conduction / cutoff according to preset delay control logic;P_SG signal end is internally connected to MCU unit, externally connected signal line two;GND end connects signal line one;The utility model is used for commercial vehicle inventory process, when detecting that vehicle power supply master switch is opened, MCU unit disconnects 24V normal power loop according to preset delay control logic to protect battery.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to a protection device for lead-acid batteries used in commercial vehicles. Background Technology

[0002] Lead-acid batteries are widely used in industries such as manufacturing and transportation. Their sales are divided into original equipment manufacturer (OEM) sales and general market sales. Currently, many OEMs store vehicles for extended periods between production and sale. During this storage period, OEM personnel disconnect the vehicle's main power switch to reduce power consumption. However, the main power switch can only disconnect high-power loads, not low-power loads like T-BOXs and GPS devices, leaving the vehicle with residual current. Even if the vehicle is not used during storage, this residual current continues to drain the battery, leading to deep discharge. Consequently, the battery quickly fails when the customer uses the vehicle after it has been sold. Summary of the Invention

[0003] The purpose of this invention is to provide a protection device for lead-acid batteries in commercial vehicles, which solves the problem of the lifespan of batteries affected by deep discharge during the inventory period of vehicles supplied to OEMs.

[0004] The technical solution adopted by this utility model is as follows: a commercial vehicle lead-acid battery protection device, which consists of a protection circuit module, a power line 1 connecting the protection circuit module to the positive output terminal of the vehicle battery, a power line 2 connecting the protection circuit module to the positive terminal of the vehicle's constant power line, a signal line 1 connecting the protection circuit module to the negative terminal of the vehicle battery, and a signal line 2 connecting the protection circuit module to the output terminal of the vehicle's power switch.

[0005] The protection circuit module includes a PCB circuit board; the PCB circuit board is provided with a protection circuit.

[0006] The protection circuit includes: two power supply terminals, 24V IN and 24V OUT; two signal terminals, P_SG and GND; as well as MOSFET switch Q1 and MCU unit.

[0007] Connect 24V IN to power cord one, and 24V OUT to power cord two;

[0008] MOSFET switch Q1 is used to control the on and off of the 24V_OUT circuit;

[0009] The MCU unit is used to drive the MOSFET switch Q1 to turn on / off according to the preset delay control logic;

[0010] The P_SG signal terminal is internally connected to the MCU unit and externally connected to signal line two, used to detect the open / closed state of the vehicle's main power switch; the GND terminal is connected to signal line one.

[0011] When the P_SG signal terminal detects that the vehicle power main switch S1 is open, it outputs a digital signal to the MCU unit. The MCU unit outputs a control signal to turn off the MOSFET switch Q1 according to the preset delay control logic, thereby disconnecting the 24V constant power circuit.

[0012] The protection circuit also includes an emergency switch SW1 for reactivating the vehicle when the circuit protection module fails, allowing the vehicle to operate normally; the emergency switch SW1 is connected to the source and drain of the MOSFET switch Q1.

[0013] The protection circuit also includes a 24V-5V / 3.3V step-down unit for providing power to the MCU unit to maintain normal operation of the MCU unit.

[0014] The protection circuit module also includes a small box for housing the PCB circuit board; the PCB circuit board is placed inside the small box, and the PCB circuit board and the small box are potted with glue.

[0015] This utility model provides a commercial vehicle lead-acid battery protection device, mainly used in the inventory management process of commercial vehicles (batteries). It solves the problem that during vehicle inventory, the continuous draining of battery power by the vehicle's dark current leads to deep battery depletion, causing the battery to fail quickly after the vehicle is sold. By adding a protection device to the battery's constant power line, after the OEM personnel disconnect the vehicle's main power switch, a certain delay is allowed for the vehicle to upload relevant data before the constant power is disconnected, thus protecting the battery. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall design of this utility model.

[0017] Figure 2 This is a schematic diagram of the installation of this utility model.

[0018] Figure 3 This is the PCB circuit diagram of this utility model.

[0019] Figure 4 This is the installation wiring diagram for this utility model. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0021] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0022] like Figure 1 , Figure 2 As shown, the commercial vehicle lead-acid battery protection device provided by this utility model consists of a protection circuit module 1, a power line 2 connecting the protection circuit module to the positive output terminal of the vehicle battery, a power line 3 connecting the protection circuit module to the positive terminal of the vehicle's constant power supply, a signal line 4 connecting the protection circuit module to the negative terminal of the vehicle battery, and a signal line 5 connecting the protection circuit module to the output terminal of the vehicle's power switch. The protection circuit module 1 includes a PCB circuit board and a small box 6 for housing the PCB circuit board. The PCB circuit board is equipped with a protection circuit.

[0023] Box 6 is a rectangular plastic box measuring 5cm x 4cm x 1.5cm (length x width x depth). The inside of the box contains a PCB circuit board, with glue applied between the circuit board and the plastic box. The back of the box has 3M adhesive for attaching to the battery. Small round holes are located at the top and bottom of the box for easy fixing using cable ties or screws, depending on the user's needs.

[0024] like Figure 3-4 As shown, the protection circuit includes two power supply terminals, 24V IN and 24V OUT, two signal terminals, P_SG and GND, as well as an MCU unit, MOSFET switch Q1, and emergency switch SW1.

[0025] The 24V IN terminal is connected to the positive output terminal of the vehicle battery via power line 2, and the 24V OUT terminal is connected to the positive terminal of the vehicle's constant power line via power line 3. The P_SG terminal is connected to the output terminal of the vehicle's main power switch via signal line 5, and the GND terminal is connected to the negative terminal of the vehicle battery.

[0026] 24V_OUT is the load output side of the circuit, and Q1 is a MOSFET that acts as an electronic switch to control the on and off of the 24V_OUT circuit.

[0027] The MCU unit drives Q1 to turn on and off according to the preset delay control logic.

[0028] The P_SG signal line is internally connected to the MCU unit and externally connected to the output side of the vehicle's main power switch S1 to detect the open / closed state of the main power switch.

[0029] The protection circuit also includes a 24V-5V / 3.3V buck converter to provide power to the MCU unit and maintain its normal operation. This buck converter is existing technology and will not be described in detail here.

[0030] When the protection circuit detects whether the vehicle power switch S1 is open, the detection unit P_SG converts the detection signal into a digital signal and transmits it to the MCU. The MCU outputs a control signal to the MOSFET drive unit to drive the MOSFET Q1 to turn on and off.

[0031] P_SG and the MCU unit form a delay circuit to delay the disconnection of MOSFET Q1, so as to allow time to upload vehicle data to the vehicle ECU.

[0032] Two power cables are led out from the PCB board, consisting of 2.5 square millimeter copper wires, with an M6 screw-in terminal block at the end for external connection. One power terminal is 24V IN, connected to the positive output terminal of the battery; the other power terminal is 24V OUT, connected to the positive terminal of the vehicle's constant power cable.

[0033] The two signal lines are led out from the PCB board and are made of 1.5 square millimeter copper wire. The end that connects to the external terminal is equipped with an M4 screw hole. One signal terminal is GND, which is connected to the negative terminal of the battery; the other signal terminal is P_SG, which is connected to the output terminal of the vehicle power switch.

[0034] SW1 is the circuit's emergency switch, connected to the source and drain of MOSFTE Q1. Its main function is to activate the circuit and restore normal vehicle operation in the event of a module failure. This switch can be manually closed to disable the device in case of a malfunction.

[0035] The working principle of this utility model is as follows: After the P_SG terminal detects that the vehicle's main power switch S1 is open, it outputs a digital signal to the MCU unit. The MCU unit, according to the preset delay control logic (such as a delay of 30 minutes), outputs a control signal to the MOSFET drive unit, turning off the MOSFET switch Q1, thereby disconnecting the constant power. If this protection device fails unexpectedly, the emergency switch SW1 can be manually closed to shield this device.

Claims

1. A protection device for lead-acid batteries in commercial vehicles, characterized in that: It consists of a protection circuit module, a power line 1 connecting the protection circuit module to the positive output terminal of the vehicle battery, a power line 2 connecting the protection circuit module to the positive terminal of the vehicle's constant power line, a signal line 1 connecting the protection circuit module to the negative terminal of the vehicle battery, and a signal line 2 connecting the protection circuit module to the output terminal of the vehicle's power switch. The protection circuit module includes a PCB circuit board; the PCB circuit board is provided with a protection circuit. The protection circuit includes: two power supply terminals, 24V IN and 24V OUT; two signal terminals, P_SG and GND; as well as MOSFET switch Q1 and MCU unit. Connect 24V IN to power cord one, and 24V OUT to power cord two; MOSFET switch Q1 is used to control the on and off of the 24V_OUT circuit; The MCU unit is used to drive the MOSFET switch Q1 to turn on / off according to the preset delay control logic; The P_SG signal terminal is internally connected to the MCU unit and externally connected to signal line two; the GND terminal is connected to signal line one. When the P_SG signal terminal detects that the vehicle power main switch S1 is open, it outputs a digital signal to the MCU unit. The MCU unit outputs a control signal to turn off the MOSFET switch Q1 according to the preset delay control logic, thereby disconnecting the 24V constant power circuit.

2. The commercial vehicle lead-acid battery protection device according to claim 1, characterized in that: The protection circuit also includes an emergency switch SW1 for reactivating the vehicle when the circuit protection module fails, allowing the vehicle to operate normally; the emergency switch SW1 is connected to the source and drain of the MOSFET switch Q1.

3. The commercial vehicle lead-acid battery protection device according to claim 1, characterized in that: The protection circuit also includes a 24V-5V / 3.3V step-down unit for providing power to the MCU unit to maintain normal operation of the MCU unit.

4. The commercial vehicle lead-acid battery protection device according to claim 1, characterized in that: The protection circuit module also includes a small box for housing the PCB circuit board; the PCB circuit board is placed inside the small box, and the PCB circuit board and the small box are potted with glue.

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