Emergency starting power supply with anti-recoil and anti-overdischarge functions

Abstract

The emergency starting power supply with the anti-recoil and anti-over-discharge functions comprises a box body, a storage battery and a control circuit part, the box body is provided with a charging port, 24V and 12V binding posts and a common cathode, and the emergency starting power supply is characterized in that a Schottky diode is connected in series on a connecting line between the storage battery and control circuit part and the 12V binding posts, and the storage battery and control circuit part is connected in series with the common cathode. The storage battery and the control circuit part are connected with the positive electrode of the Schottky diode, and the 12V binding post is connected with the negative electrode of the Schottky diode. According to the emergency starting power supply of the utility model, the unilateral conductivity of the Schottky diode is utilized, so that the vehicle-mounted 24V storage battery can be prevented from being charged through the 12V binding post, and the overcharge phenomenon after misconnection can be avoided, and therefore, the fire and explosion phenomena of the emergency starting power supply can be avoided. Furthermore, a first fuse and a second fuse are connected in series between the storage battery and the control circuit part and the 12V and 24V binding posts, so that a short-circuit overcurrent protection effect on the starting power supply is achieved.

Description

Technical Field

[0001] The utility model relates to an emergency starting power supply, and more specifically, to an emergency starting power supply with the functions of preventing backlash and over-discharge. Background Art

[0002] The emergency starting power supply is used to replace the onboard battery to complete the normal starting of the vehicle when the car battery is low. Common car battery models are 12V and 24V. For 24V car batteries, due to the influence of ambient temperature, in Northeast my country, if the 24V car battery is low and falls below 21V, the vehicle will not start normally. In Shandong Province, if the battery is low and falls below 19V, the vehicle will not start normally. For 12V car batteries, in Shandong Province, if the battery is low and falls to 9V, the vehicle will not start normally. In Northeast China, if the battery is low and falls to 11V, the vehicle will not start normally. Therefore, to ensure that the emergency starting power supply can start vehicles with both 12V and 24V batteries, the emergency starting power supply is equipped with a 12V external power supply interface and a 24V external power supply interface.

[0003] The types of batteries used in the emergency starting power supply include ternary lithium batteries, lithium iron phosphate batteries, and sodium batteries. The emergency starting power supply uses a switching power supply charger to convert 220V AC power into 29.2-29.6V or 16.8V+12.6V for ternary lithium batteries, 29V-29.2V or 14.6V+14.6V for lithium iron phosphate batteries, and 27.65V or 15.8V+11.85V or 15.8V+15.8V for sodium batteries. The voltage of each battery cell is detected by a BMS or lithium battery protection board with different voltages to ensure that it does not exceed the maximum upper limit voltage for charging. Emergency starting power supplies use batteries with high-rate discharge and low-current charging. Because the discharge current is too large, the starting power supply has no protection on the discharge circuit (i.e., direct in and direct out). For example, patent document CN2022224271645 discloses a car emergency starting power supply with remote control, undervoltage protection and intermittent switching. Its 24V and 12V discharge circuits have no protection and adopt a direct external power supply method.

[0004] However, during use, some users do not distinguish between the 12V and 24V power supply terminals and use a direct connection charging method. When the weather is very cold, it is easy for users to connect the power supply line incorrectly. If the 24V terminal on the emergency starting power supply is connected to drive the 12V vehicle battery to start the vehicle, the vehicle battery will pull down the voltage of the starting power supply, which will not cause damage to the vehicle. At most, the power of the starting power supply will be completely discharged. However, if the 12V gear of the emergency starting power supply is used to start a vehicle with a 24V vehicle battery, the situation will be serious. The battery on the 24V vehicle will immediately charge the emergency starting power supply through the 12V terminal, and the charging current is quite large. The discharge port of the starting power supply is straight in and out without protection. At this time, the 12V of the starting power supply will be seriously overcharged, causing fire and explosion. Summary of the Invention

[0005] In order to overcome the disadvantages of the above technical problems, the utility model provides an emergency starting power supply with the functions of preventing backlash and over-discharge.

[0006] The utility model provides an emergency starting power supply with anti-recoil and over-discharge functions, comprising a box body, a battery and a control circuit part arranged in the box body, a charging port, a 24V terminal, a 12V terminal and a common negative pole are provided on the box body, the charging port, the 24V terminal, the 12V terminal and the common negative pole are all connected to the battery and the control circuit part, the charging port is used to charge the battery in the battery and the control circuit part, the 24V terminal and the common negative pole are used to provide emergency starting power supply to the 24V vehicle-mounted battery, and the 12V terminal and the common negative pole are used to provide emergency starting power supply to the 12V vehicle-mounted battery; the utility model is characterized in that a Schottky diode is connected in series on the connection line between the battery and the control circuit part and the 12V terminal, the battery and the control circuit part are connected to the positive pole of the Schottky diode, and the 12V terminal is connected to the negative pole of the Schottky diode.

[0007] In the utility model of the emergency starting power supply with the function of preventing backlash and over-discharge, a first fuse is connected in series on the connection line between the Schottky diode and the 12V terminal.

[0008] The utility model provides an emergency starting power supply with the functions of preventing backlash and over-discharge, wherein a second fuse is connected in series on the connection line between the battery and the control circuit part and the 24V terminal.

[0009] The utility model provides an emergency starting power supply with the functions of preventing backlash and over-discharge. The melting and cutting current of the first fuse is 300A-500A, and the melting and cutting current of the second fuse is 600A.

[0010] In the utility model of the emergency starting power supply with the functions of preventing backlash and over-discharge, the Schottky diode is formed by connecting two diodes in parallel.

[0011] The beneficial effect of the present invention is that the emergency starting power supply of the present invention has a Schottky diode in series on the connection line between the battery and control circuit part of the emergency starting power supply and the 12V terminal, and the positive electrode of the Schottky diode is connected to the battery and control circuit part, and the negative electrode of the Schottky diode is connected to the 12V terminal. In this way, when in use, when the 12V terminal is used to power the 12V vehicle battery to start the vehicle, the battery and the control circuit part normally supply power to the outside through the Schottky diode to complete the emergency starting of the vehicle. However, when the 12V terminal is mistakenly connected to the on-board 24V battery, the unidirectional conductivity of the Schottky diode will block the on-board 24V battery (the voltage of which is relatively low at this time, but also above 19V) from charging the emergency starting power supply through the 12V terminal, thereby avoiding the occurrence of overcharging of the emergency power supply after the wrong connection, thereby avoiding the occurrence of fire or explosion of the emergency starting power supply.

[0012] Furthermore, by connecting the first fuse and the second fuse in series between the battery and the control circuit part and the 12V terminal and the 24V terminal respectively, when the 12V terminal and the 24V terminal are short-circuited with the common negative pole, overcurrent can be avoided, thereby protecting the emergency starting power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the emergency starting power supply with anti-recoil and over-discharge functions of the utility model;

[0014] Figure 2 The utility model is a circuit diagram of an emergency starting power supply with anti-recoil and over-discharge functions.

[0015] In the figure: 1 box, 2 battery and control circuit part, 3 charging port, 4 24V terminal, 5 12V terminal, 6 common negative pole, 7 Schottky diode, 8 first fuse, 9 second fuse. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] like Figure 1 and 2The schematic diagram and circuit diagram of the emergency starting power supply with anti-recoil and anti-overdischarge functions of the present invention are shown, respectively. The emergency starting power supply comprises a housing 1, a battery and a control circuit 2 housed therein. Housing 1 is provided with a charging port 3, a 24V terminal 4, a 12V terminal 5, and a common negative electrode 6 extending through its sidewall. The charging port 3, 24V terminal 4, 12V terminal 5, and common negative electrode 6 are all connected to the battery and control circuit 2. The battery and control circuit 2 are charged via the charging port 3. The 24V terminal 4 and common negative electrode 6 connect to a 24V vehicle battery for emergency starting of a vehicle with a 24V battery. The 12V terminal 5 and common negative electrode 6 connect to a 12V vehicle battery for emergency starting of a vehicle with a 12V battery.

[0018] However, in actual use, due to negligence of the user, the 12V terminal and the common negative electrode 6 may be mistakenly connected to the 24V vehicle battery. At this time, although the 24V vehicle battery cannot start the vehicle, its battery is also about 19V. Therefore, when the 12V terminal of the emergency starting power supply is connected to the 24V vehicle battery, the 24V vehicle battery will charge the emergency starting power supply quickly and with a large current, thereby causing the emergency starting power supply to catch fire or explode. Therefore, the emergency starting power supply of the utility model has increased Figure 1 and Figure 2 The circuit in the dotted line part, Figure 1 and Figure 2 In the figure, the dotted part is the circuit part added by the emergency starting power supply of the present invention, and the remaining solid line part is consistent with that in the patent document with patent number CN2022224271645.

[0019] like Figure 1 and Figure 2 As shown by the dashed line in the figure, a Schottky diode 7 is connected in series between the battery and control circuit 2 and the 12V terminal 5. The positive electrode of Schottky diode 7 is connected to the battery and control circuit 2, and the negative electrode of Schottky diode 7 is connected to the 12V terminal 5. Due to the unidirectional conductivity of Schottky diode 7, current can only flow from the positive electrode to the negative electrode of Schottky diode 7, and cannot flow from the negative electrode to the positive electrode. Therefore, after the Schottky diode 7 is connected between the 12V terminal 5 of the emergency starting power supply and the battery and control circuit 2, when the 12V terminal 5 and the common negative electrode 6 are connected to the vehicle's 12V battery, the battery and control circuit 2 can normally power the 12V vehicle battery via the 12V terminal 5 and the common negative electrode 6, completing the vehicle emergency starting.

[0020] When the 12V terminal 5 and the common negative pole 6 on the emergency starting power supply are mistakenly connected to the on-board 24V battery, due to the unidirectional conductivity of the Schottky diode 7, the on-board 24V battery will not charge the battery in the emergency starting power supply through the 12V terminal 5, and the emergency starting power supply will not be overcharged, thereby avoiding the occurrence of fire or explosion of the emergency starting power supply.

[0021] A first fuse 8 is connected in series between the Schottky diode 7 and the 12V terminal 5, and a second fuse 9 is connected in series between the battery and control circuit 2 and the 24V terminal 4. The first fuse 8 has a cutoff current of 300A to 500A, while the second fuse 9 has a cutoff current of 600A. This prevents overcurrent when the 12V and 24V terminals are shorted to the common negative pole, thus protecting the emergency starting power supply.

Claims

1. An emergency starting power supply with anti-recoil and over-discharge functions, comprising a box (1) and a battery and a control circuit part (2) arranged in the box, the box being provided with a charging port (3), a 24V terminal (4), a 12V terminal (5) and a common negative electrode (6), the charging port, the 24V terminal, the 12V terminal and the common negative electrode being connected to the battery and the control circuit part, the charging port being used to charge the battery in the battery and the control circuit part, the 24V terminal and the common negative electrode being used to provide emergency starting power to a 24V vehicle-mounted battery, and the 12V terminal and the common negative electrode being used to provide emergency starting power to a 12V vehicle-mounted battery; characterized in that: A Schottky diode (7) is connected in series on the connection line between the battery and control circuit part and the 12V terminal, the battery and control circuit part are connected to the positive electrode of the Schottky diode, and the 12V terminal is connected to the negative electrode of the Schottky diode.

2. The emergency starting power supply with anti-recoil and over-discharge functions according to claim 1, characterized in that: A first fuse (8) is connected in series on the line between the Schottky diode (7) and the 12V terminal.

3. The emergency starting power supply with anti-recoil and over-discharge functions according to claim 2 is characterized in that: A second fuse (9) is connected in series on the connection line between the battery and control circuit part (2) and the 24V terminal (4).

4. The emergency starting power supply with anti-recoil and over-discharge functions according to claim 3 is characterized in that: The melting and cutting current of the first fuse (8) is 300A-500A, and the melting and cutting current of the second fuse (9) is 600A.

5. The emergency starting power supply with anti-recoil and over-discharge functions according to claim 1 or 2, characterized in that: The Schottky diode (7) is formed by connecting two diodes in parallel.

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