Hybrid battery system and electric vehicle

Abstract

The utility model provides a hybrid battery system and an electric automobile. The hybrid battery system comprises a high-energy battery; a high-rate type battery, wherein the high-energy type battery and the high-rate type battery are connected in series; the output end of the high-magnification battery is connected with the input end of the driving motor; and the energy supplementing circuit is connected between the high-energy type battery and the high-rate type battery. When the electric quantity of the high-magnification type battery is insufficient, the high-energy type battery can supplement energy to the high-magnification type battery through the energy supplementing circuit. The high-magnification battery serves as a power source to output stable and effective high-strength electric power for the driving motor, and normal and efficient operation of the driving motor is guaranteed. The high-rate battery and the high-energy battery are connected in series, so that the advantages of the two types of batteries can be fully utilized, and effective fusion of high efficiency and high-strength power is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicles, in particular to a hybrid battery system and an electric vehicle. Background Art

[0002] Battery systems are widely used in many applications, of which electric vehicles are a notable example. As electric vehicles become more popular, the demand for battery systems is also increasing. Battery systems need to meet the energy storage and power output requirements required for vehicle driving while also ensuring long life and good reliability.

[0003] In the related art, common electric vehicles usually use a single type of battery system, such as a high-energy battery, such as a lithium iron phosphate battery, which has a high energy density and can provide a long driving range. However, when the vehicle requires a large current output, a single high-energy battery will be limited and may not be able to meet the demand. At the same time, another type of battery, a high-rate battery, such as a lithium titanate battery, although it can provide a higher current output, has a relatively low energy density, resulting in a limited driving range. Therefore, there are some shortcomings in using these two types of batteries alone. Utility Model Content

[0004] According to one aspect of the present disclosure, a hybrid battery system is provided, the hybrid battery system comprising: a high energy battery;

[0005] a high-rate battery, the high-energy battery being connected in series with the high-rate battery;

[0006] A driving motor, wherein the output end of the high-rate battery is connected to the input end of the driving motor;

[0007] A charging circuit is connected between the high-energy battery and the high-rate battery.

[0008] In some possible implementations, the high-energy battery is a lithium iron phosphate battery.

[0009] In some possible implementations, the high-rate battery is a lithium titanate battery.

[0010] In some possible implementations, the energy compensation circuit includes a DC-DC conversion circuit.

[0011] In some possible implementations, the DC-DC conversion circuit includes a buck-boost converter.

[0012] In some possible implementations, the hybrid battery system further includes a battery management module, and the battery management module is connected to the high-energy battery and the high-rate battery.

[0013] In some possible implementations, the battery management module is connected to an energy management module.

[0014] In some possible implementations, the drive motor is connected to a wheel module.

[0015] According to another aspect of the present disclosure, the utility model also provides an electric vehicle, comprising a hybrid battery system as described in the above aspect.

[0016] The hybrid battery system provided by the embodiment of the utility model includes a high-energy battery, a high-rate battery, a drive motor and a recharge circuit. The high-energy battery serves as a power source, and its extremely high energy storage capacity can meet the main daily power needs. When the power of the high-rate battery is insufficient, the high-energy battery can recharge the high-rate battery through the recharge circuit. The high-rate battery serves as a power source and outputs stable and effective high-intensity electricity to the drive motor to ensure the normal and efficient operation of the drive motor. By arranging the high-rate battery and the high-energy battery in series, the advantages of the two types of batteries can be fully utilized to achieve an effective fusion of high efficiency and high-intensity power. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a module block diagram of an embodiment of the utility model.

[0018] Explanation of reference numerals: 100, high-energy battery; 200, high-rate battery; 300, driving motor; 400, energy replenishment circuit; 500, battery management module; 600, energy management module; 700, wheel module. DETAILED DESCRIPTION

[0019] The overall idea of ​​the technical solution provided by the utility model is as follows:

[0020] See also Figure 1 A hybrid battery system includes: a high-energy battery 100; a high-rate battery 200, the high-energy battery 100 and the high-rate battery 200 are connected in series; a drive motor 300, the output end of the high-rate battery 200 is connected to the input end of the drive motor 300; and a charging circuit 400, the charging circuit 400 is connected between the high-energy battery 100 and the high-rate battery 200.

[0021] The high-energy battery 100 is used as a power source, and its extremely high energy storage capacity can meet the main daily power needs. The high-energy battery 100 can replenish the high-rate battery 200 through the energy replenishment circuit 400. The high-rate battery 200, as a power source, outputs stable and effective high-intensity power to the drive motor 300 to ensure the normal and efficient operation of the drive motor 300. By arranging the high-rate battery 200 and the high-energy battery 100 in series, the advantages of the two types of batteries can be fully utilized to achieve an effective fusion of high efficiency and high-intensity power.

[0022] In addition, if the high-energy battery 100 is connected in parallel with the high-rate battery 200 to the drive motor 300 through the energy replenishment circuit 400, once the voltage of the high-energy battery 100 is low, it cannot charge the high-rate battery 200, so it is difficult to drive the drive motor 300. On the contrary, if the two batteries are connected in series, even if the voltage of the high-energy battery 100 is low, it will not affect the charging and discharging of the high-rate battery 200. This can ensure that the drive motor 300 can get enough current to drive under any circumstances, thereby effectively avoiding the problem that the high-energy battery 100 has a low voltage and cannot charge the high-rate battery 200 due to the high-energy battery 100 being connected in parallel with the high-rate battery 200, so that it is difficult to drive the drive motor 300.

[0023] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Furthermore, the high-energy battery 100 is a lithium iron phosphate battery. Specifically, the high-energy battery 100 refers to a type of battery that can store more energy and provide power output for a longer time. This type of battery, such as a lithium iron phosphate battery, has a higher energy density, that is, more energy can be stored per unit volume or mass. The lithium iron phosphate battery is a new type of rechargeable battery. It has the advantages of large energy storage capacity, long cycle life, good thermal stability and high safety performance. As a power source, the lithium iron phosphate battery can provide continuous and stable high power output.

[0025] Furthermore, the high-rate battery 200 is a lithium titanate battery. Specifically, the high-rate battery 200 refers to a type of battery designed and manufactured with rapid discharge and extraction, that is, high-rate discharge capability as the main goal. In some application scenarios, such as electric vehicle starting, power tools, etc., what is needed is that the battery can provide high peak current in a short time, which requires the battery to have a high-rate discharge capability. Lithium titanate batteries are widely believed in the market to have excellent charging and discharging performance, can provide large current in a very short time, and are suitable for scenarios with high requirements for large current. At the same time, lithium titanate batteries have a long cycle life and good thermal stability, and are extremely suitable for use as high-rate batteries 200.

[0026] Furthermore, the energy replenishment circuit 400 includes a DC-DC conversion circuit. Specifically, the DC-DC conversion circuit has two parts, an input part and an output part. The input part is connected to the high-voltage high-energy battery 100, and the output part is connected to the low-voltage high-rate battery 200. During operation, this DC-DC conversion circuit can convert the electric energy of the high-voltage high-energy battery 100 into a low voltage suitable for the high-rate battery 200. As needed, the DC-DC conversion circuit can smoothly supply electric energy to the high-rate battery 200, thereby achieving a smooth supply of electric energy.

[0027] Furthermore, the DC-DC conversion circuit includes a buck-boost converter. Specifically, the buck-boost converter is a four-switch converter that can convert the input DC voltage into an output voltage higher or lower than the original input voltage. Such a design can provide very flexible voltage conversion options and can keep the power supply current smooth and continuous during the voltage conversion process, thereby preventing potential problems caused by sudden changes in current and voltage. The buck-boost converter is used to adjust the voltage difference between the high-energy battery 100 and the high-rate battery 200. It can efficiently convert the high-voltage output of the high-energy battery 100 into the low-voltage input required by the high-rate battery 200, thereby providing a stable power supply for the high-rate battery 200.

[0028] Furthermore, the hybrid battery system further includes a battery management module 500, which is connected to the high-energy battery 100 and the high-rate battery 200. Specifically, the battery management module 500 is responsible for real-time monitoring of the status of the dual battery pack. The battery management module 500 generally includes some sensors and controllers to monitor and control the status of the battery in real time. For example, a current sensor can be used to measure charging and discharging currents, a voltage sensor can be used to measure battery voltage, a temperature sensor can be used to monitor battery temperature, and so on.

[0029] Furthermore, the battery management module 500 is connected to the energy management module 600. Specifically, the energy management module 600 is an energy control and optimization device, which is mainly responsible for the overall management of energy generation, transmission, storage and consumption. Its main purpose is to ensure the stability of energy supply and maximize the effective use of energy. In the hybrid battery system, the energy management module 600 is responsible for making decisions to start the energy replenishment process based on the information provided by the battery management module 500. For example, when the SOC of the high-rate battery 200 is low, the high-rate battery 200 may need to provide more energy to meet the demand. At this time, the energy management module 600 will notify the energy replenishment circuit 400 to start, and convert the electrical energy of the high-energy battery 100 and transmit it to the low-voltage high-rate battery 200.

[0030] Furthermore, the drive motor 300 is connected to the wheel module 700. Specifically, the drive motor 300 acts as an engine in the electric vehicle, providing driving force to drive the vehicle. The wheel module 700 is a part of the vehicle, which transmits the driving force to the road surface to drive the vehicle. The drive motor 300 can directly drive the wheel module 700, or it can drive the wheel module 700 through some transmission device (such as a transmission or a differential).

[0031] An embodiment of the utility model further provides an electric vehicle, including a hybrid battery system as in the aforementioned embodiment. Various variations and specific embodiments in the aforementioned embodiment are also applicable to the electric vehicle of this embodiment. Through the aforementioned detailed description of a hybrid battery system, those skilled in the art can clearly understand the implementation method of the electric vehicle in this embodiment. For the sake of brevity of the specification, it will not be described in detail here.

[0032] In summary, the utility model provides a hybrid battery system. In actual use, the high-energy battery 100 is used as a power source. Its extremely high energy storage capacity can meet the main daily power needs. When the power of the high-rate battery 200 is insufficient, the high-energy battery 100 can replenish the high-rate battery 200 through the energy replenishment circuit 400. The high-rate battery 200, as a power source, outputs stable and effective high-intensity power to the drive motor 300 to ensure the normal and efficient operation of the drive motor 300. By arranging the high-rate battery 200 and the high-energy battery 100 in series, the advantages of the two types of batteries can be fully utilized to achieve an effective fusion of high efficiency and high-intensity power.

[0033] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0034] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A hybrid battery system, characterized in that: include: High energy type battery; a high-rate battery, the high-energy battery being connected in series with the high-rate battery; A driving motor, wherein the output end of the high-rate battery is connected to the input end of the driving motor; A charging circuit is connected between the high-energy battery and the high-rate battery.

2. A hybrid battery system according to claim 1, characterized in that: The high energy battery is a lithium iron phosphate battery.

3. A hybrid battery system according to claim 1, characterized in that: The high-rate battery is a lithium titanate battery.

4. A hybrid battery system according to claim 1, characterized in that: The energy compensation circuit includes a DC-DC conversion circuit.

5. A hybrid battery system according to claim 4, characterized in that: The DC-DC conversion circuit includes a buck-boost converter.

6. A hybrid battery system according to claim 1, characterized in that: It also includes a battery management module, which is connected to the high-energy battery and the high-rate battery.

7. A hybrid battery system according to claim 6, characterized in that: The battery management module is connected to the energy management module.

8. A hybrid battery system according to claim 1, characterized in that: The drive motor is connected to the wheel module.

9. An electric vehicle, characterized in that: Comprising a hybrid battery system as described in any one of claims 1-8.

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