Battery charging device

Abstract

The present invention relates to the technical field of battery charging, and provides a battery charging device. The present invention solves the problems of poor charging effect and inconvenient charging of existing storage batteries. The battery charging device comprises a power supply and DC-DC converter; a positive electrode of the power supply is connected to an input end of the DC-DC converter; a positive electrode output end of the DC-DC converter is connected to a negative electrode of the power supply, and then leads out a positive electrode charging interface connected to a positive electrode end of a random battery; a negative electrode output end of the DC-DC converter leads out a negative electrode charging interface connected to a negative electrode end of the random battery; and the voltage of the power supply is less than that of the random battery. The present invention can conveniently and effectively realize mobile charging and improve the battery endurance.

Description

A charging device for a battery TECHNICAL FIELD

[0001] The present application belongs to the technical field of battery charging, and relates to a charging device for a battery. BACKGROUND

[0002] Storage batteries have been widely used in various fields, especially in the fields of telecommunications, backup power supply, energy storage power supply and power use, due to their environmental protection and rechargeable advantages. However, there are some defects in the use of storage batteries, such as short cruising range and inconvenient charging when applied to electric vehicles.

[0003] Electric vehicles include two-wheeled electric vehicles, three-wheeled electric vehicles, electric cars and the like. It is well known that the existing battery charging of electric vehicles is all provided by external single-phase or three-phase alternating current, and the energy is provided after the alternating current is rectified to direct current by a transformer. The power grid cannot be charged at any time as a fixed energy device. The energy supplement of electric vehicles mainly comes from charging piles. Although the number of charging piles has increased, it is still necessary to go to a designated location to charge when charging, which is very inconvenient. In addition, when the voltage of the market public charging pile is lower than the charging voltage of the electric vehicle, the electric vehicle cannot effectively compatible with the charging pile on the market, the vehicle can only be charged to a lower SOC, cannot be fully charged, and even cannot be charged, which causes great inconvenience to people's travel.

[0004] In order to solve the above problems of inconvenient charging and poor vehicle endurance, one of the effective methods is to reduce the weight of the vehicle, so as to increase the cruising range of the electric vehicle. Another method is to provide energy for the vehicle at any time. As a renewable energy source, solar energy is easy to think of by those skilled in the art to provide charging energy for the vehicle by solar power generation. However, the power generation capacity of solar power is very small. According to the statistics of cadmium telluride solar panels at present, 1 square meter generates about 180 watts, but does not include factors such as overcast days and low conversion efficiency at night. For example, a solar power panel of about 2 square meters can be installed on the roof of an energy vehicle, and the power generation capacity is about 360 watts. The energy vehicle is provided with a 60V100AH storage battery, and the charging voltage is 90V. The charging current is 12.5A, and the charging capacity should be 1125W, which is much larger than the power generation capacity of solar energy. The charging effect of the storage battery is not ideal. In addition, the currently launched electric vehicle range extender that can be installed randomly indeed solves the endurance problem, but returns to the traditional supply of gasoline and diesel oil. The device is large in size, high in cost, loud in noise, and needs oil consumption, which is not environmentally friendly and economical.

[0005] And sometimes for public charging pile due to grid voltage drop and cause the voltage is lower than electric vehicle charging voltage, there is no normal charging situation, the existing operation is to split the battery on the vehicle into several batteries with voltage less than the charging device voltage, and then charge the several batteries one by one to meet the voltage high charging voltage low requirement, reduce the charging voltage of charging pile or charging device, but the existing charging method needs to split the battery on the vehicle, the charging needs to convert the line, the line is complex, the charging is complex. SUMMARY

[0006] The purpose of the present application is to solve the above-mentioned problems existing in the prior art, and to provide a battery charging device, which solves the technical problem of how to conveniently and effectively realize mobile charging.

[0007] The purpose of the present application can be realized by the following technical scheme: a battery charging device, comprising a power supply and a DCDC converter, the positive electrode of the power supply is connected with the input end of the DCDC converter, the positive electrode output end of the DCDC converter is connected with the negative electrode of the power supply and then leads out a positive electrode charging interface for connecting the positive electrode end of a random battery, the negative electrode output end of the DCDC converter leads out a negative electrode charging interface for connecting the negative electrode end of a random battery, and the voltage of the power supply is less than the voltage of the random battery.

[0008] The battery charging device can charge the battery in the vehicle or the battery in each device that can be charged. The random battery refers to the battery on the electric vehicle or the battery in each device. In the charging device, the power supply with a voltage less than the random battery can charge the random battery. This design allows the use of a smaller power supply in the charging device, which reduces the size of the power supply and greatly reduces the size of the charging device, making it easy to carry and charge the electrical equipment at any time. In use, the positive electrode charging interface and the negative electrode charging interface are respectively connected to the positive electrode and the negative electrode of the random battery, so that the power supply and the random battery are connected in series. The voltage of the power supply and the random battery is added and then charged to the random battery through the DCDC converter. This solves the problem that the charging voltage must be greater than the battery voltage in the existing battery charging, which leads to large charging energy capacity, large charging device size and high cost, and cannot be charged randomly. Through the application of the battery charging device, the power supply of the power grid or the charging pile can be replaced to achieve the purpose of random charging of electrical equipment. At the same time, through the use of the charging device, the charging is not limited to the charging pile, but can also be applied to the field of mobile power supply, power storage and other energy sources. This scheme not only provides protection for the endurance of electrical equipment, but also achieves the purpose of conveniently and effectively charging the random battery.

[0009] In the battery charging device, the power supply is selected according to the voltage of the random battery and the charging current, and the DCDC converter is selected according to the voltage of the power supply, the voltage of the random battery and the charging current. The power supply is selected according to the random battery and the charging current, such as the charging of the random battery on the electric vehicle, a power supply with a smaller voltage is used, and a power supply with a larger voltage is used for the charging of the random battery on the electric vehicle. On this basis, the smaller the charging current, the smaller the voltage of the power supply selected, and the operation can ensure the charging efficiency while reducing the size of the charging device, so that it can be applied to different vehicle models and achieve the effect of portable mobile charging at any time and anywhere.

[0010] In the battery charging device, the power supply uses a power supply with a voltage value between one sixteenth and one third of the voltage value of the random battery. The size of the power supply is proportional to the capacity, and the smaller the voltage of the power supply, the smaller the size. The use of the charging device can not only ensure the charging effect of the power grid, but also reduce the size of the charging device, so that it can be conveniently carried and achieve the effect of charging at any time.

[0011] In the battery charging device, the power supply uses a power supply or a battery pack.

[0012] In the battery charging device, the power supply has a positive terminal port and a negative terminal port for connecting an external power supply. The power supply can use solar panels, generators, wind energy and other power generation equipment. By connecting the power supply to the two ends of the power supply, the power supply can be supplemented with electric energy, thereby further charging the random battery and further increasing the cruising range of the random battery. In addition, when the random battery is used for energy storage in power supply, the power storage efficiency can be improved. Moreover, the use of the charging device can effectively increase the conversion efficiency of solar power generation equipment, achieve the same charging capacity as traditional power grid power supply, and achieve the purpose of random charging.

[0013] In the battery charging device, the positive terminal port and the positive terminal of the power supply are connected with a diode D1, the positive terminal of the diode D1 is connected with the positive terminal port, and the negative terminal of the diode D1 is connected with the positive terminal of the power supply. The diode D1 can prevent the power supply from reverse discharging the power supply, and ensure the charging efficiency of the charging device.

[0014] In the above battery charging device, a first voltage limiting and current limiting circuit for preventing overcharging of the power supply is connected between the negative electrode of the diode D1 and the positive electrode of the power supply. The first voltage limiting and current limiting circuit is a prior art circuit, which can stop the power supply from charging when the power supply is fully charged, thereby avoiding damage to the power supply caused by overcharging and helping to improve the service life of the power supply.

[0015] In the above battery charging device, an under-voltage circuit for stopping charging when the voltage of the power supply is too low is connected between the positive electrode of the power supply and the input end of the DCDC converter. The under-voltage circuit is a prior art circuit, which, when applied in the present charging device, can stop charging the random battery when the voltage of the power supply is below a certain value, thereby reducing damage to the power supply caused by excessively low voltage.

[0016] In the above battery charging device, a diode D2 is further connected between the positive output end of the DCDC converter and the positive charging interface, with the positive electrode of the diode D2 connected to the positive output end of the DCDC converter and the negative electrode of the diode D2 connected to the positive charging interface. The diode D2 can prevent reverse discharge and improve the charging efficiency of the random battery.

[0017] In the above battery charging device, a second voltage limiting and current limiting circuit for preventing overcharging of the random battery is further connected between the positive output end of the DCDC converter and the positive charging interface. The second voltage limiting and current limiting circuit is a prior art circuit, which can prevent overcharging of the random battery and protect the random battery.

[0018] In the above battery charging device, a super capacitor C1 and a diode D3 are connected between the positive charging interface and the negative charging interface, with the positive electrode of the diode D3 connected to the positive electrode of the super capacitor C1, the negative electrode of the diode D3 connected to the positive charging interface, and the negative electrode of the super capacitor C1 connected to the negative charging interface. Since the random battery is used to provide power for other electrical appliances, the super capacitor C1 is designed to reduce the voltage drop when the appliance is first used, thereby improving the stability of the circuit.

[0019] In the above battery charging device, the diode D3 is connected in parallel with a current limiting circuit. The current limiting circuit is a prior art circuit for protecting the random battery.

[0020] Compared with the prior art, the battery charging device has the following advantages:

[0021] 1. The application solves the problem that small batteries cannot charge large batteries in the prior art. The application charges random batteries by designing a small-capacity power supply, effectively reducing the size of the charging device, making it easy to carry, and providing power storage for electrical equipment anytime and anywhere, making charging more convenient and improving the endurance of electrical equipment.

[0022] 2. The design of the application can also be connected to a power supply energy source, which can supplement the power supply with power supply energy, and achieve the same charging effect as traditional power grid power supply. When the power supply energy is solar energy, the application can also improve the conversion efficiency of solar energy, providing further guarantee for the endurance of random batteries, and realizing the convenient and effective mobile charging of electrical equipment. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic diagram of the circuit structure of the application.

[0024] In the figure, 1 is a power supply, 2 is a DCDC converter, 3 is a positive charging interface, 4 is a negative charging interface, 5 is a positive connection port, 6 is a negative connection port, 7 is a first voltage limiting and current limiting circuit, 8 is a second voltage limiting and current limiting circuit, 9 is an under-voltage circuit, 10 is a current limiting circuit, 11 is a random battery, and 12 is a power supply energy source. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the application clearer, the following will further describe the embodiments of the application in conjunction with the drawings. The following description of at least one exemplary embodiment is actually only illustrative, but not as any limitation on the application and its application or use. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the application.

[0026] As shown in Figure 1, the charging device of the application comprises a power supply 1 and a DCDC converter 2, the positive electrode of the power supply 1 is connected with the input end of the DCDC converter 2, the positive electrode output end of the DCDC converter 2 is connected with the negative electrode of the power supply 1 and then leads out a positive electrode charging interface 3 for connecting the positive electrode end of the random battery 11, the negative electrode output end of the DCDC converter 2 leads out a negative electrode charging interface 4 for connecting the negative electrode end of the random battery 11, and the voltage of the power supply 1 is less than the voltage of the random battery 11. When selecting the power supply 1, the power supply 1 is selected according to the voltage and charging current of the random battery 11, and the power supply 1 is generally selected to have a voltage value between one-sixteenth and one-third of the voltage value of the random battery 11, and a power bank or a battery pack can be used as the power supply 1. When selecting the power supply 1, if the charging device is used to supplement the electric energy of an electric vehicle, a power supply 1 with a smaller voltage value can be selected, for example, when the random battery 11 of the electric vehicle is 48V, the voltage value of the power supply 1 is selected to be between 3V and 16V, and within this voltage value range, the voltage value of the power supply 1 is selected to be proportional to the size of the charging current, that is, the larger the charging current, the larger the voltage value of the power supply 1. However, when the charging device is used to supplement the electric energy of an electric vehicle, for example, when the random battery 11 of the electric vehicle is 332V, a power supply 1 with a larger voltage value can be selected, for example, a 96V battery is selected as the power supply 1. The use of a power supply 1 with a voltage value much smaller than that of the random battery 11 as a charging energy source effectively reduces the size of the charging device, making the charging device portable and allowing it to supplement the electric energy of an electric vehicle or an electric vehicle at any time, thereby improving the endurance.

[0027] In order to reduce the size of the charging device while achieving the purpose of using a power supply 1 with a voltage value much smaller than that of the random battery 11 as a charging energy source to charge the random battery 11, that is, to achieve the purpose of charging a large battery with a small battery, the positive electrode charging interface 3 and the negative electrode charging interface 4 of the charging device are respectively connected to the positive electrode and the negative electrode of the random battery 11, so that the power supply 1 is connected in series with the random battery 11. After series connection, the voltage of the power supply 1 and the random battery 11 is greater than the voltage of the random battery 11, and then the DCDC converter 2 charges the random battery 11, solving the problem that the charging voltage must be greater than the battery voltage during the charging of the existing battery, resulting in a large charging energy capacity, a large charging device size, a high cost and the inability to charge randomly. In addition, through the application of the battery charging device, the power supply of the power grid or charging pile can be replaced to achieve the purpose of random charging of the power equipment, thereby providing protection for the endurance of the power equipment and achieving the purpose of conveniently and effectively charging the random battery 11.

[0028] In order to ensure the charging efficiency of the random battery 11, the DCDC converter 2 is selected according to the voltage of the power supply 1, the voltage of the random battery 11 and the charging current. Specifically, the value obtained by adding the voltage of the power supply 1 to the voltage of the random battery 11 and then multiplying by the charging current can be selected, for example, the random battery 11 on the electric vehicle is 48V, the power supply 1 is 12V, and the charging current is 2.5A, then (12v+48v)×2.5A=150w, the DCDC converter 2 is selected to be about 150W converter. For example, the random battery 11 on the electric vehicle is 332V, the power supply 1 is 96V, and the charging current is 10A, then (96v+332v)x10A=4280w, so the DCDC converter 2 is selected to be about 4280W converter. Thus, the charging efficiency is ensured, and the vehicle can be randomly charged, which provides guarantee for the endurance of the vehicle.

[0029] In order to further improve the endurance of the random battery 11, the power supply 1 has a positive terminal port 5 and a negative terminal port 6 at both ends, respectively. The positive terminal port 5 and the negative terminal port 6 are used to externally connect the power supply 12. The power supply 12 can use solar panels, battery packs or generators, etc. When the solar panels are connected between the positive terminal port 5 and the negative terminal port 6, the solar panels can convert solar energy into electrical energy to supplement the power supply 1. Since the capacity of the power supply 1 is small, the conversion efficiency of the solar panels is greatly improved. Through the application of the charging device, the same charging capacity as traditional power grid power supply can be achieved, and the purpose of random charging is achieved.

[0030] In order to ensure the charging efficiency and charging stability, the positive terminal 5 is connected with the positive pole of the power supply 1 through a diode D1, the positive pole of the diode D1 is connected with the positive terminal 5, and the negative pole of the diode D1 is connected with the positive pole of the power supply 1. The negative pole of the diode D1 is connected with the positive pole of the power supply 1 through a first voltage limiting and current limiting circuit 7 for preventing overcharging of the power supply 1. The positive pole of the power supply 1 is connected with the input end of the DCDC converter 2 through an under-voltage circuit 9 for stopping charging when the voltage of the power supply 1 is too low. The positive output end of the DCDC converter 2 is connected with the positive charging interface 3 through a diode D2, the positive pole of the diode D2 is connected with the positive output end of the DCDC converter 2, and the negative pole of the diode D2 is connected with the positive charging interface 3 through a second voltage limiting and current limiting circuit 8 for preventing overcharging of the random battery 11. The positive charging interface 3 and the negative charging interface 4 are connected with a super capacitor C1 and a diode D3, the positive pole of the diode D3 is connected with the positive pole of the super capacitor C1, the negative pole of the diode D3 is connected with the positive charging interface 3, the negative pole of the super capacitor C1 is connected with the negative charging interface 4, and the diode D3 is connected with a current limiting circuit 10 in parallel. In the embodiment, the first voltage limiting and current limiting circuit 7, the second voltage limiting and current limiting circuit 8, the current limiting circuit 10 and the under-voltage circuit 9 are all existing circuits, which will not be discussed in detail. Through the diode D1 and the diode D2, the reverse discharge can be avoided, and the stability of charging is improved. Through the diode D3, the discharge path of the super capacitor C1 to the random battery 11 is provided. Through the first voltage limiting and current limiting circuit 7, the second voltage limiting and current limiting circuit 8, the current limiting circuit 10 and the under-voltage circuit 9, the power supply 1 and the random battery 11 can be protected, the damage caused by overcharging or too low voltage can be avoided, and the life of the battery can be improved.

[0031] The specific embodiments described herein merely illustrate the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A battery charging device, characterized in that, The charging device includes a power supply (1) and a DC-DC converter (2). The positive terminal of the power supply (1) is connected to the input terminal of the DC-DC converter (2). The positive output terminal of the DC-DC converter (2) is connected to the negative terminal of the power supply (1) and then leads out a positive charging interface (3) for connecting the positive terminal of the random battery (11). The negative output terminal of the DC-DC converter (2) leads out a negative charging interface (4) for connecting the negative terminal of the random battery (11). The voltage of the power supply (1) is less than the voltage of the random battery (11).

2. The battery charging device according to claim 1, characterized in that, The power supply (1) is selected based on the voltage and charging current of the random battery (11), and the DC-DC converter (2) is selected based on the voltage of the power supply (1), the voltage of the random battery (11), and the charging current.

3. The battery charging device according to claim 2, characterized in that, The power supply (1) uses a voltage value between one-sixteenth and one-third of the voltage value of the random battery (11).

4. The battery charging device according to claim 1, 2, or 3, characterized in that, The power supply (1) is a power bank or battery pack.

5. The battery charging device according to claim 1, 2, or 3, characterized in that, The power supply (1) also has a positive terminal (5) and a negative terminal (6) for connecting an external power source (12) at both ends. A diode D1 is connected between the positive terminal (5) and the positive terminal of the power supply (1). The positive terminal of the diode D1 is connected to the positive terminal (5), and the negative terminal of the diode D1 is connected to the positive terminal of the power supply (1).

6. The battery charging device according to claim 5, characterized in that, A first voltage limiting and current limiting circuit (7) for preventing overcharging of the power supply (1) is connected between the negative terminal of the diode D1 and the positive terminal of the power supply (1).

7. The battery charging device according to claim 1, 2, or 3, characterized in that, An undervoltage circuit (9) is connected between the positive terminal of the power supply (1) and the input terminal of the DC-DC converter (2).

8. The battery charging device according to claim 1, 2, or 3, characterized in that, A diode D2 is connected between the positive output terminal of the DC-DC converter (2) and the positive charging interface (3). The positive terminal of the diode D2 is connected to the positive output terminal of the DC-DC converter (2), and the negative terminal of the diode D2 is connected to the positive charging interface (3).

9. The battery charging device according to claim 8, characterized in that, A second voltage and current limiting circuit (8) is also connected between the positive output terminal of the DC-DC converter (2) and the positive charging interface (3) to prevent the random battery (11) from being overcharged.

10. The battery charging device according to claim 1, 2, or 3, characterized in that, A supercapacitor C1 and a diode D3 are connected between the positive charging interface (3) and the negative charging interface (4). The positive terminal of the diode D3 is connected to the positive terminal of the supercapacitor C1, the negative terminal of the diode D3 is connected to the positive charging interface (3), and the negative terminal of the supercapacitor C1 is connected to the negative charging interface (4). The diode D3 is connected in parallel to a current limiting circuit (10).

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