Low-voltage power supply system, battery pack and battery box

Abstract

The invention relates to a low-voltage power supply system, a battery pack and a battery box, and belongs to the technical field of low-voltage power supply. The low-voltage power supply system comprises a direct-current conversion module; the input end of the direct-current conversion module is used for being connected with a power supply line in a single battery pack, and the output end of the direct-current conversion module is used for being connected with a vehicle low-voltage load so as to reduce the voltage of the power supply line in the battery pack to the voltage level required by the vehicle low-voltage load and provide the voltage to the vehicle low-voltage load; the battery pack belongs to a battery box comprising at least two battery packs and is used for driving a vehicle motor. High voltage of the power supply line in the battery pack connected with the input end is directly converted into low voltage through the direct current conversion module, power is supplied to the low-voltage load, and the system is more reliable and stable.

Description

Technical Field

[0001] The present invention relates to a low-voltage power supply system, a battery pack and a battery box, belonging to the technical field of low-voltage power supply. Background Art

[0002] For electric vehicles, the power supply system of electric vehicles usually consists of a high-voltage power supply (power battery) and a low-voltage power supply. As the high-voltage power supply, the main function of the power battery is to store energy and release it when needed to drive the motor. The low-voltage power supply, such as a lead-acid battery of 24V, 12V or 48V, is mainly used to supply power to the low-voltage loads of the vehicle. These low-voltage loads include lighting systems, instrument systems, entertainment systems, electric windows, windshield wipers, defrosters and various controllers. In addition, when the vehicle starts, a low-voltage power supply is also required to activate the high-voltage electricity of the power battery so that the high-voltage electricity of the power battery can drive the motor. However, the commonly used lead-acid battery has strong pollution, and the lead-acid battery is heavy, has a short service life and a large volume, resulting in a waste of the precious space of the vehicle. At present, some electric vehicles begin to use lithium batteries as low-voltage power supplies. Lithium batteries have less pollution and can reduce the pollution caused by using lead-acid batteries as low-voltage power supplies. However, lithium batteries have high costs and a risk of fire, and the volume after grouping is also large, still resulting in a waste of the precious space of the vehicle.

[0003] The Chinese invention patent with the application publication number of CN116278820A discloses a technical solution of an integrated vehicle electrical architecture without a low-voltage energy source and a vehicle. This technical solution controls the converter control module to supply power to the first central domain controller and / or the second central domain controller through the battery management system, and the first central domain controller and / or the second central domain controller then provide low-voltage electricity to various low-voltage loads. This technical solution cancels low-voltage energy sources such as lead-acid batteries or lithium batteries as starting power supplies, saving the precious space of the vehicle. At the same time, it can also meet the energy requirements of the vehicle for various low-voltage loads under various working conditions (including the low-voltage energy required for vehicle starting). However, both the first central domain controller and the second central domain controller output low-voltage electricity through electronic fuses. After any fuse in the high-voltage circuit is disconnected, low-voltage electricity cannot be provided to the low-voltage loads, resulting in the vehicle crashing and poor reliability. Summary of the Invention

[0004] The purpose of the present invention is to provide a low-voltage power supply system, a battery pack and a battery box to solve the problem that the current method of supplying low-voltage power to low-voltage loads through electronic fuses will cause the interruption of low-voltage power supply after any fuse in the high-voltage circuit is disconnected, resulting in the vehicle crashing and poor reliability.

[0005] The present invention provides a low-voltage power supply system to solve the above technical problems, which includes a DC conversion module; the input end of the DC conversion module is used to connect to the power supply line inside a single battery pack, and the output end is used to connect to a vehicle low-voltage load, so as to reduce the voltage of the power supply line inside the battery pack to the voltage level required by the vehicle low-voltage load and supply it to the vehicle low-voltage load; the battery pack belongs to a battery box containing at least two battery packs and is used to drive a vehicle motor.

[0006] Further, the output end of the DC conversion module is used to connect to the vehicle low-voltage load through the battery monitoring circuit board of the battery pack where the power supply line connected to the input end is located, so as to use the battery monitoring circuit board of this battery pack to adjust the output power of the output end of the DC conversion module.

[0007] Further, the DC conversion module includes a positioning sub-module, and the positioning sub-module is used to send the position information of the DC conversion module to the battery monitoring circuit board connected to the output end of the DC conversion module, so that the battery monitoring circuit board can obtain the position of the battery pack connected to the DC conversion module according to the position information of the DC conversion module.

[0008] Further, the low-voltage power supply system is used to be installed inside the outer shell of the battery pack connected to the DC conversion module.

[0009] Beneficial effects: The present invention provides a new low-voltage power supply system. In this system, the input end of the DC conversion module is used to connect to the power supply line inside a single battery pack, and the output end is used to connect to a vehicle low-voltage load, so as to reduce the voltage (high voltage) of the power supply line inside the battery pack connected to the input end of the DC conversion module to the voltage level required by the vehicle low-voltage load (low voltage), and supply the obtained low-voltage power to the low-voltage load inside the vehicle. The provided low-voltage power can meet the low-voltage energy requirements under various working conditions of the vehicle (including the low-voltage energy requirements during vehicle startup and driving). Compared with the existing method of supplying low voltage through a high-voltage loop fuse and then through a step-down module, the present invention does not require a high-voltage fuse and directly converts the high-voltage power of the power supply line inside the battery pack into low-voltage power through the DC conversion module to supply power to the low-voltage load, which is more reliable and stable; and compared with the method of taking power from the vehicle's overall high-voltage power supply loop externally connected to the battery box, the present invention only takes power from the internal power supply line of a single battery pack in the battery pack used to drive the vehicle motor, so the voltage level before voltage conversion is actually relatively low, and a DC conversion module with a large power is not required, thus saving costs accordingly.

[0010] The present invention also provides a battery pack, which includes a low-voltage power supply system and an internal power supply line; the low-voltage power supply system includes a DC conversion module; the input end of the DC conversion module is connected to the internal power supply line, and the output end is used to be connected to a vehicle low-voltage load to reduce the voltage of the internal power supply line to the voltage level required by the vehicle low-voltage load and supply it to the vehicle low-voltage load; the battery pack belongs to a battery box containing at least two battery packs and is used to drive a vehicle motor.

[0011] Further, it also includes a battery monitoring circuit board; the output end of the DC conversion module is connected to the vehicle low-voltage load through the battery monitoring circuit board of this battery pack to adjust the output power of the output end of the DC conversion module by using this battery monitoring circuit board.

[0012] Further, the DC conversion module includes a positioning sub-module, and the positioning sub-module is used to send the position information of the DC conversion module to the battery monitoring circuit board of this battery pack so that the battery monitoring circuit board can obtain the position of this battery pack according to the position information of the DC conversion module.

[0013] This battery pack can achieve the same beneficial effects as the above-mentioned low-voltage power supply system.

[0014] The present invention also provides a battery box, which contains at least two battery packs and is used to drive a vehicle motor; at least one battery pack in the battery box includes a low-voltage power supply system and an internal power supply line, and the low-voltage power supply system in this battery pack includes a DC conversion module; the input end of the DC conversion module is connected to the internal power supply line, and the output end is used to be connected to a vehicle low-voltage load to reduce the voltage of the internal power supply line to the voltage level required by the vehicle low-voltage load and supply it to the vehicle low-voltage load.

[0015] Further, the battery pack in the battery box that includes a low-voltage power supply system and an internal power supply line also includes a battery monitoring circuit board; the output end of the DC conversion module is connected to the vehicle low-voltage load through the battery monitoring circuit board of this battery pack to adjust the output power of the output end of the DC conversion module by using this battery monitoring circuit board.

[0016] Further, the DC conversion module includes a positioning sub-module, and the positioning sub-module is used to send the position information of the DC conversion module to the battery monitoring circuit board of this battery pack so that the battery monitoring circuit board can obtain the position of this battery pack according to the position information of the DC conversion module.

[0017] This battery box can achieve the same beneficial effects as the above-mentioned low-voltage power supply system. Description of the Drawings

[0018] Figure 1It is a structural schematic diagram of the low-voltage power supply system in the embodiment of the low-voltage power supply system of the present invention installed inside the outer shell of the battery pack connected to the DC conversion module; Figure 2 It is a schematic diagram of the internal structure of the battery box in the embodiment of the battery box of the present invention. Detailed implementation manners

[0019] The following further describes the detailed implementation manners of the present invention with reference to the accompanying drawings.

[0020] Embodiment of the low-voltage power supply system This embodiment provides a technical solution for a low-voltage power supply system. The low-voltage power supply system directly converts the high-voltage electricity of the power supply line inside a single battery pack for driving a vehicle motor into low-voltage electricity to supply low-voltage electricity to the low-voltage loads of the vehicle, without passing through a high-voltage fuse. Compared with the existing method of supplying low-voltage power through an electronic fuse, it is more reliable and stable.

[0021] The low-voltage power supply system specifically includes a DC conversion module; the input end of the DC conversion module is used to connect to the power supply line inside a single battery pack, and the output end is used to connect to the low-voltage loads of the vehicle, so as to reduce the voltage of the power supply line inside the battery pack to the voltage level required by the low-voltage loads of the vehicle and supply it to the low-voltage loads of the vehicle; the battery pack belongs to a battery box containing at least two battery packs and is used to drive the vehicle motor. The low-voltage power supply system can convert the high-voltage electricity of the power supply line inside a single battery pack connected to the input end of the DC conversion module in the low-voltage power supply system into the low-voltage electricity required by the low-voltage loads of the vehicle, and supply the converted low-voltage electricity to the low-voltage loads of the vehicle. Moreover, the power supply process does not need to pass through a high-voltage fuse. Compared with the existing method of supplying low-voltage power through an electronic fuse, it is more reliable and stable.

[0022] The following gives an example of the low-voltage power supply system: The low-voltage power supply system includes a DC conversion module; the input end of the DC conversion module is used to connect to the power supply line inside a single battery pack, and the output end is used to connect to the low-voltage loads of the vehicle, so as to reduce the voltage of the power supply line inside the battery pack to the voltage level required by the low-voltage loads of the vehicle and supply it to the low-voltage loads of the vehicle; the battery pack belongs to a battery box containing at least two battery packs and is used to drive the vehicle motor.

[0023] In this embodiment, the low-voltage power supply system is used to be installed inside the outer shell of the battery pack connected to the DC conversion module, which helps to protect the low-voltage power supply system and is more reliable and safe. The structural schematic diagram of the low-voltage power supply system installed inside the outer shell of the battery pack connected to the DC conversion module is as Figure 1 shown, Figure 1The blue rectangle in it represents a single battery pack connected to the DC conversion module. There is a power supply line inside the battery pack, and the battery packs are connected in series with other battery packs in the battery box. MSD is the high-voltage circuit fuse; in this embodiment, the DC conversion module uses a DC / DC converter, and the DC / DC converter is high-low voltage isolated, which improves the reliability of low-voltage power supply. The DC conversion module is corresponding to Figure 1 "DCDC & Positioning" in it. In other embodiments, the DC conversion module can also use other devices or combinations of devices that can convert high-voltage electricity into low-voltage electricity; In this embodiment, the output end of the DC conversion module is used to connect to the vehicle low-voltage load through the battery monitoring circuit board of the battery pack where the power supply line connected to the input end is located, so as to use the battery monitoring circuit board (Cell Supervision Circuit, CSC) of this battery pack to adjust the output power of the output end of the DC conversion module. The output end of the DC conversion module is used to connect to the vehicle low-voltage load through the battery monitoring circuit board of the battery pack where the power supply line connected to the input end is located, so that the output end of the DC conversion module provides low-voltage electricity (taking 24V as an example of the low-voltage electricity here) to the CSC and the low-voltage load. The DC conversion module is also serially connected (SPI) to the CSC to utilize the CSC to adjust the output power of the DC conversion module; Figure 1 The negative grounding in it means that the negative pole output by the CSC is grounded nearby; Figure 1 The activation in it refers to waking up the sleeping CSC through a high-level signal. The encoding refers to the CSC sorting each battery box according to the voltage level on the encoding line to facilitate distinguishing each battery box. The CSC is connected to a CAN communication line for communicating with the Battery Management System (BMS).

[0024] In this embodiment, the DC conversion module includes a positioning sub-module. The positioning sub-module is used to send the position information of this DC conversion module to the battery monitoring circuit board (CSC) connected to the output end of the DC conversion module, so that the battery monitoring circuit board (CSC) can obtain the position of the battery pack connected to this DC conversion module according to the position information of this DC conversion module. Adding a positioning sub-module to the DC conversion module is equivalent to adding an anti-theft function to the battery pack. In this embodiment, the DC / DC converter is added with a positioning sub-module, and the input end of the DC / DC converter added with the positioning sub-module is connected to the power supply line inside a single battery pack; in other embodiments, when the anti-theft function added to the battery pack is not required, the DC conversion module can also have no positioning sub-module. Correspondingly, the battery monitoring circuit board will not be able to obtain the position of the battery pack.

[0025] Battery Pack Embodiment This embodiment provides a technical solution for a battery pack. The battery pack includes a low-voltage power supply system and an internal power supply line; referring to Figure 1 , the low-voltage power supply system is installed inside the housing of the battery pack. The low-voltage power supply system includes a DC conversion module; in this embodiment, the DC conversion module uses a DC / DC converter, which is high-voltage and low-voltage isolated, improving the reliability of the low-voltage power supply. In other embodiments, the DC conversion module can also use other devices or combinations of devices that can convert high-voltage electricity into low-voltage electricity; the input end of the DC conversion module is connected to the internal power supply line, and the output end is used to connect to the vehicle low-voltage load to reduce the voltage of the internal power supply line of the battery pack to the voltage level required by the vehicle low-voltage load and supply it to the vehicle low-voltage load; the battery pack belongs to a battery box containing at least two battery packs and is used to drive the vehicle motor.

[0026] In this embodiment, the battery pack further includes a battery monitoring circuit board (CSC); the output end of the DC conversion module is connected to the vehicle low-voltage load through the battery monitoring circuit board of the battery pack to adjust the output power of the output end of the DC conversion module by using the battery monitoring circuit board.

[0027] In this embodiment, the DC conversion module includes a positioning sub-module (i.e., a positioning sub-module is added to the DC / DC converter), and the positioning sub-module is used to send the position information of the DC conversion module to the battery monitoring circuit board of the battery pack, so that the battery monitoring circuit board can obtain the position of the battery pack according to the position information of the DC conversion module.

[0028] Battery box embodiment This embodiment provides a technical solution for a battery box. The battery box contains at least two battery packs and is used to drive the vehicle motor; at least one battery pack in the battery box includes a low-voltage power supply system and an internal power supply line. An example diagram of the internal structure of the battery box in this embodiment is as Figure 2 shown. In this embodiment, each battery pack in the battery box corresponds to Figure 2 Pack1, Pack2, PackN in Figure 2The battery packs in the battery box all include a low-voltage power supply system and an internal power supply line; in this embodiment, the low-voltage power supply system is installed inside the housing of the battery pack where the low-voltage power supply system is located. The low-voltage power supply system in the battery pack that includes the low-voltage power supply system and the internal power supply line in the battery box includes a DC conversion module; in this embodiment, the DC conversion module in the low-voltage power supply system uses a DC / DC converter, and the DC / DC converter is high-low voltage isolated, which improves the reliability of the low-voltage power supply. In other embodiments, other components capable of realizing DC voltage conversion can also be used; the input end of the DC conversion module is connected to the internal power supply line in the battery pack, and the output end is used to be connected to the vehicle low-voltage load to reduce the voltage of the internal power supply line of the battery pack to the voltage level required by the vehicle low-voltage load and provide it to the vehicle low-voltage load.

[0029] In this embodiment, the battery pack in the battery box that includes the low-voltage power supply system and the internal power supply line further includes a battery monitoring circuit board (corresponding to Figure 2 the CSC in); the output end of the DC conversion module is connected to the vehicle low-voltage load through the battery monitoring circuit board of the battery pack to adjust the output power of the output end of the DC conversion module by using the battery monitoring circuit board. The CSC in each battery pack respectively adjusts the output power of the output end of the DC conversion module connected to the battery monitoring circuit board.

[0030] In this embodiment, the DC conversion module includes a positioning sub-module (that is, a positioning sub-module is added to the DC / DC converter), and the positioning sub-module is used to send the position information of the DC conversion module to the battery monitoring circuit board of the battery pack that includes the low-voltage power supply system and the internal power supply line, so that the battery monitoring circuit board can obtain the position of the battery pack according to the position information of the DC conversion module.

[0031] It should be understood that the above specific embodiments of the present invention are only used for exemplary illustration or explanation of the principle of the present invention, and do not constitute a limitation to the present invention.

Claims

1. A low voltage power supply system, characterized in that: It includes a DC conversion module; the input end of the DC conversion module is used to connect to the power supply line inside a single battery pack, and the output end is used to connect to the vehicle's low-voltage load, so as to reduce the voltage of the power supply line inside the battery pack to the voltage level required by the vehicle's low-voltage load and provide it to the vehicle's low-voltage load; the battery pack is a battery box containing at least two battery packs, which is used to drive the vehicle's motor.

2. The low voltage power supply system according to claim 1, characterized in that: The output end of the DC conversion module is used to connect to the vehicle's low-voltage load through the battery monitoring circuit board of the battery pack where the power supply line connected to the input end is located, so as to use the battery monitoring circuit board of the battery pack to adjust the output power of the output end of the DC conversion module.

3. The low voltage power supply system according to claim 2, characterized in that: The DC conversion module includes a positioning submodule, which is used to send the position information of the DC conversion module to the battery monitoring circuit board connected to the output end of the DC conversion module, so that the battery monitoring circuit board can obtain the position of the battery pack connected to the DC conversion module according to the position information of the DC conversion module.

4. The low voltage power supply system according to any one of claims 1 to 3, characterized in that: The low-voltage power supply system is used to be installed inside the housing of the battery pack to which the DC conversion module is connected.

5. A battery pack, characterized in that: Including low voltage power supply system and internal power supply circuit; The low-voltage power supply system includes a DC conversion module; the input end of the DC conversion module is connected to the internal power supply line, and the output end is used to connect to the vehicle's low-voltage load to reduce the voltage of the internal power supply line to the voltage level required by the vehicle's low-voltage load and provide it to the vehicle's low-voltage load; the battery pack is a battery box containing at least two battery packs, which is used to drive the vehicle's motor.

6. The battery pack according to claim 5, characterized in that: It also includes a battery monitoring circuit board; the output end of the DC conversion module is connected to the vehicle low-voltage load through the battery monitoring circuit board of the battery pack, so that the output power of the output end of the DC conversion module can be adjusted by using the battery monitoring circuit board.

7. The battery pack according to claim 6, characterized in that: The DC conversion module includes a positioning submodule, which is used to send the position information of the DC conversion module to the battery monitoring circuit board of the battery pack, so that the battery monitoring circuit board obtains the position of the battery pack according to the position information of the DC conversion module.

8. A battery box, characterized in that: Contains at least two battery packs for driving a vehicle motor; at least one battery pack in the battery box includes a low-voltage power supply system and an internal power supply circuit, and the low-voltage power supply system in the battery pack includes a DC conversion module; The input end of the DC conversion module is connected to the internal power supply line, and the output end is used to connect to the vehicle low-voltage load to reduce the voltage of the internal power supply line to the voltage level required by the vehicle low-voltage load and provide it to the vehicle low-voltage load.

9. The battery box according to claim 8, characterized in that: The battery pack in the battery box, which includes a low-voltage power supply system and an internal power supply line, also includes a battery monitoring circuit board; the output end of the DC conversion module is connected to the vehicle's low-voltage load through the battery monitoring circuit board of the battery pack, so that the output power of the output end of the DC conversion module can be adjusted by using the battery monitoring circuit board.

10. The battery box according to claim 9, characterized in that: The DC conversion module includes a positioning submodule, which is used to send the position information of the DC conversion module to the battery monitoring circuit board of the battery pack, so that the battery monitoring circuit board obtains the position of the battery pack according to the position information of the DC conversion module.

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