Automobile double-battery system

Abstract

The utility model relates to the technical field of automobile battery application, and discloses an automobile double-battery system which comprises an automobile generator, an original automobile battery and a standby battery, the original automobile battery is connected to the output end of the automobile generator, and the output end of the automobile generator is further connected with the input end of a double-battery isolator. The output end of the double-battery isolator is connected to the standby battery, the double-battery isolator is grounded through a grounding wire, the double-battery isolator comprises a current sampling unit, a relay unit and a control unit, and the output end of the automobile generator is connected to the standby battery after being connected with the current sampling unit and the relay unit. And the control unit controls the relay unit according to the current signal of the current sampling unit to enable the output end of the automobile generator to be connected and disconnected with the standby battery. According to the utility model, through the current detection function, the standby battery is disconnected when the current is reduced to be insufficient to charge the standby battery or the standby battery charges the original vehicle battery.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile battery application, in particular to an automobile dual-battery system. Background Art

[0002] When using special vehicles (emergency communication vehicles, RVs, ambulances, factory vehicles), a backup battery is needed in addition to the original vehicle battery to power the electronic equipment installed in the vehicle to ensure that the electronic equipment can operate normally when the vehicle is turned off.

[0003] Use the car dual battery separator to connect between the car generator and the two batteries. When charging, connect the original car battery and the backup battery in parallel. When not charging, disconnect the parallel connection and separate the original car battery and the backup battery.

[0004] The existing automobile dual battery separator connects the original vehicle battery and the backup battery through a relay, uses the automobile generator to charge the backup battery, and realizes the switching of the relay by monitoring the voltage of the automobile generator. When the automobile starts the generator to charge the original vehicle battery, after the original vehicle battery is full, the automobile dual battery separator starts to charge the backup battery. When the automobile is turned off, the generator output voltage will decrease, and the dual battery separator will be disconnected to stop charging.

[0005] However, during the driving of the car, the output voltage of the car generator changes, and during the charging process of the car dual battery separator, the backup battery will be discharged to the original car battery, thus affecting the normal working logic of the dual battery. Utility Model Content

[0006] The utility model aims to solve the above problems and provides a dual-battery system for automobiles. Through the current detection function, the backup battery is disconnected when the current is reduced to be insufficient to charge the backup battery or when a reverse current occurs in which the backup battery charges the original vehicle battery.

[0007] The technical solution adopted by the utility model is:

[0008] A car dual battery system, characterized in that it includes a car generator, an original car battery, and a backup battery, wherein the original car battery is connected to the output end of the car generator, the output end of the car generator is also connected to the input end of a dual battery isolator, the output end of the dual battery isolator is connected to the backup battery, the dual battery isolator is grounded through a grounding wire, the dual battery isolator includes a current sampling unit, a relay unit and a control unit, the output end of the car generator is connected to the backup battery after being connected to the current sampling unit and the relay unit, and the control unit controls the relay unit to connect and disconnect the output end of the car generator with the backup battery according to the current signal of the current sampling unit.

[0009] Furthermore, the control unit includes a current detection circuit, a main control circuit and a relay circuit of a relay unit. The relay unit also includes a relay element arranged at the input end of the backup battery. The current detection circuit detects the current value of the current sampling unit and sends it to the main control circuit. The main control circuit controls the relay circuit according to the current value to turn the relay element on and off.

[0010] Furthermore, the control unit also includes a voltage stabilizing circuit, a voltage detection circuit and a digital tube. The voltage stabilizing circuit provides a constant voltage for the main control circuit, the voltage detection circuit detects the voltage values ​​of the original vehicle battery and the backup battery, and the digital tube is used to display current and voltage data.

[0011] Furthermore, the control unit also includes an auxiliary circuit, and the auxiliary circuit is used to switch the digital tube to display different data.

[0012] Furthermore, the dual battery isolator includes a shell and a PCB installed in the shell. A terminal is arranged on the left and right sides of the shell, respectively used to connect the output end of the automobile generator and the input end of the backup battery. A ground wire is led out from the bottom of the shell for grounding. The control unit is integrated on the PCB.

[0013] Furthermore, a display panel is provided on the top of the housing, and the display panel displays battery and charging parameters.

[0014] The beneficial effects of the utility model are:

[0015] (1) Detect the voltage of the original vehicle battery and the backup battery at the same time. When the backup battery voltage is greater than the original vehicle battery voltage, the separator is not turned on to prevent the high-voltage backup battery from discharging to the low-voltage original vehicle battery;

[0016] (2) The separator detects the charging current when working, and can detect both the forward current and the reverse current;

[0017] (3) The charging status is determined by detecting the real-time forward charging current. When the forward current continues to decrease to a level that is insufficient to maintain charging; or when a reverse current appears when the backup battery charges the original vehicle battery, the separator will disconnect the charging and separate the two batteries.

[0018] (4) Use the product’s digital tube to display real-time charging current and other parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Attached Figure 1 It is the installation wiring diagram of the utility model;

[0020] Attached Figure 2 Yes Figure 1 Schematic diagram of the internal module of the dual-battery isolator. DETAILED DESCRIPTION

[0021] The specific implementation of the automobile dual battery system of the utility model is described in detail below with reference to the accompanying drawings.

[0022] See attached Figure 1 The automobile dual battery system includes an automobile generator 1, an original vehicle battery 2, and a backup battery 3. The original vehicle battery 2 is connected to the output end of the automobile generator 1. The output end of the automobile generator 1 is also connected to the input end of a dual battery isolator 4. The output end of the dual battery isolator 4 is connected to the backup battery 3. The dual battery isolator 4 is grounded through a grounding wire 5.

[0023] The dual battery isolator 4 includes a shell and a PCB installed in the shell. A terminal is arranged on the left and right sides of the shell respectively, which is used to connect the output end of the automobile generator 1 and the input end of the backup battery 3 respectively. A grounding wire 5 is led out from the bottom of the shell for grounding.

[0024] See attached Figure 2 The dual battery isolator 4 includes a current sampling unit 6, a relay unit 7 and a control unit 8. The output end of the automobile generator 1 is connected to the current sampling unit 6 and the relay unit 7 and then connected to the backup battery 3. The control unit 8 controls the relay unit 7 to connect and disconnect the output end of the automobile generator 1 and the backup battery 3 according to the current signal of the current sampling unit 6.

[0025] The control unit 8 is integrated on the PCB inside the battery isolator. The PCB is installed inside the housing and sealed inside the housing by waterproof glue. The housing is made of plastic, with operation buttons installed on it, and sealed by screws. A display panel is set on the top of the housing, and the display panel displays battery and charging parameters.

[0026] The control unit 8 includes a current detection circuit, a main control circuit and a relay circuit of a relay unit 7. The relay unit 7 also includes a relay element arranged at the input end of the backup battery 3. The current detection circuit detects the current value of the current sampling unit 6 and sends it to the main control circuit. The main control circuit controls the relay circuit according to the current value to turn the relay element on and off.

[0027] The control unit 8 also includes a voltage stabilizing circuit, a voltage detection circuit, an auxiliary circuit and a digital tube. The voltage stabilizing circuit provides a constant voltage for the main control circuit, the voltage detection circuit detects the voltage values ​​of the original vehicle battery 2 and the backup battery 3, the digital tube is used to display current and voltage data, and the auxiliary circuit is used to switch the digital tube to display different data.

[0028] Since the output voltage and current of the generator have different characteristics when the car is idling, driving, turning on the air conditioner, using a smart generator, or using a lithium battery as the backup battery 3, for different output voltages and currents, the dual battery isolator 4 analyzes the current information of the current sampling unit 6 through the logic control of the main control circuit, and when a certain threshold is reached, the circuit breaker is activated to disconnect the backup battery 3 from the circuit, so as to prevent the generation of charging reverse current between the backup battery 3 and the original vehicle battery 2.

[0029] It should be noted that the main control unit inside the dual battery isolator of this patent is assembled and configured by the electrical module in the prior art. It is an application of the prior art and can be completed by technicians in this field. The current detection circuit inside the control unit, the main control circuit, the relay circuit of the relay unit, the voltage stabilization circuit, the voltage detection circuit, the auxiliary circuit and the digital tube, etc., can all be built using circuits or modules in the prior art. The main control circuit is responsible for the logical operation when the automobile generator outputs different voltages and currents. The main control circuit uses an MCU programmable chip to determine the on-off control of the relay unit on the relay element according to the different voltage and current values ​​obtained in the experiment. The MCU chip uses a general chip in the prior art. According to the MCU manual and the basic programming ability mastered, the technicians in this field can program according to the logic of the relay control to complete the dual battery charging function. Therefore, the internal logic part of the control unit of this patent belongs to the prior art. The object of protection of this patent is to use the dual battery isolator to cooperate with the automobile generator and dual batteries to enable the relay to achieve safe charging of the dual batteries. Its essence is the circuit on-off itself, not the logic itself.

[0030] The above are only preferred implementations of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An automotive dual battery system, characterized in that: The invention comprises an automobile generator, an original vehicle battery and a backup battery. The original vehicle battery is connected to the output end of the automobile generator. The output end of the automobile generator is also connected to the input end of a dual-battery isolator. The output end of the dual-battery isolator is connected to the backup battery. The dual-battery isolator is grounded through a grounding wire. The dual-battery isolator comprises a current sampling unit, a relay unit and a control unit. The output end of the automobile generator is connected to the backup battery after being connected to the current sampling unit and the relay unit. The control unit controls the relay unit to switch the output end of the automobile generator on and off with the backup battery according to the current signal of the current sampling unit.

2. The automotive dual battery system according to claim 1, characterized in that: The control unit includes a current detection circuit, a main control circuit and a relay circuit of a relay unit. The relay unit also includes a relay element arranged at the input end of the backup battery. The current detection circuit detects the current value of the current sampling unit and sends it to the main control circuit. The main control circuit controls the relay circuit according to the current value to realize the switching of the relay element.

3. The automotive dual battery system according to claim 2, characterized in that: The control unit also includes a voltage stabilizing circuit, a voltage detection circuit and a digital tube. The voltage stabilizing circuit provides a constant voltage for the main control circuit, the voltage detection circuit detects the voltage values ​​of the original vehicle battery and the backup battery, and the digital tube is used to display current and voltage data.

4. The automotive dual battery system according to claim 3, characterized in that: The control unit also includes an auxiliary circuit, and the auxiliary circuit is used to switch the digital tube to display different data.

5. The automotive dual battery system according to any one of claims 1 to 4, characterized in that: The dual battery isolator includes a shell and a PCB installed in the shell. A terminal is arranged on the left and right sides of the shell, respectively used to connect the output end of the automobile generator and the input end of the backup battery. A ground wire is led out from the bottom of the shell for grounding. The control unit is integrated on the PCB.

6. The automotive dual battery system according to claim 5, characterized in that: A display panel is arranged on the top of the housing, and the display panel displays battery and charging parameters.

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