Battery management system of electric automobile, battery pack and electric automobile

Abstract

The utility model discloses a battery management system of an electric automobile, a battery pack and the electric automobile, the battery management system comprises a separated power supply system, and the power supply system comprises a power supply end used for inputting an input voltage; the first voltage conversion circuit is used for performing voltage conversion on an input voltage provided by an input power supply to generate a first power supply voltage; the second voltage conversion circuit is used for performing voltage conversion on the first power supply voltage to obtain second power supply voltage; the at least one voltage stabilizing circuit is used for performing voltage conversion on at least one of the input voltage, the first power supply voltage and the second power supply voltage to obtain at least one third power supply voltage; the first voltage conversion circuit receives the wake-up signal to control the loop to be powered on and off, so that the power consumption of the battery management system can be reduced. Therefore, the separated multi-stage power supply system can be used for providing various power supply voltages, the hardware cost of a product is reduced, and the stability and the design flexibility of the circuit are improved.

Description

[0001] Description of the case

[0002] This application is a divisional application of a Chinese patent with an application date of November 23, 2023, application number 202323184282.9, and invention name “Power supply system and battery management system”. Technical Field

[0003] The utility model relates to the field of power supply control, and in particular to a battery management system, a battery pack and an electric vehicle of an electric vehicle. Background Art

[0004] The System of Base Chip (SBC) is a power integrated chip that can be used to manage, control, adjust and monitor power outputs of various voltage specifications to provide power supply requirements for different functional circuits in the device.

[0005] In the related art, SBC performs a voltage conversion on the input power voltage through different buck-boost conversion modules or voltage stabilization modules, and converts the input power voltage into multiple power supply voltages. However, the SBCs on new energy vehicles are generally expensive and are subject to market supply and demand. Users may face the disadvantages of high supply risks and high costs. Utility Model Content

[0006] The utility model mainly provides a battery management system, a battery pack and an electric vehicle for an electric vehicle. Through multiple voltage conversion methods, not only can a separate multi-stage power supply system be used to replace the function of an SBC and provide multiple power supply voltages, but also the hardware cost of the product is reduced and the stability of the circuit and the design flexibility are improved.

[0007] The technical solution of the utility model is achieved in this way:

[0008] In a first aspect, an embodiment of the present utility model provides a power supply system, the power supply system comprising:

[0009] An input power supply, used for providing an input voltage;

[0010] A first voltage conversion circuit, the first voltage conversion circuit is connected to the output end of the input power supply, and is used to perform voltage conversion on the input voltage provided by the input power supply to generate a first supply voltage;

[0011] A second voltage conversion circuit, the second voltage conversion circuit is connected to the output end of the first voltage conversion circuit, and is used to perform voltage conversion on the first supply voltage to obtain a second supply voltage;

[0012] At least one voltage stabilizing circuit is respectively connected to at least one of the output end of the input power supply, the output end of the first voltage conversion circuit and the output end of the second voltage conversion circuit, and is used to perform voltage conversion on at least one of the input voltage, the first supply voltage and the second supply voltage to obtain at least one third supply voltage.

[0013] Through the above-mentioned technical means, the input voltage is converted through a first voltage conversion circuit, and then converted through a second voltage conversion circuit and at least one voltage stabilizing circuit for multi-branch conversion, so as to provide a first power supply voltage, a second power supply voltage and at least one third power supply voltage to power modules with different voltage requirements. This not only increases the range and number of specifications of the power supply voltage, meets the power voltage requirements of different modules, but also improves the accuracy and stability of voltage regulation.

[0014] In some embodiments, the at least one voltage stabilization circuit includes a first voltage stabilization circuit, wherein:

[0015] The first voltage stabilizing circuit is connected to the output end of the first voltage conversion circuit and is used for performing voltage conversion on the first power supply voltage to obtain a third power supply voltage.

[0016] Through the above technical means, the first power supply voltage is converted through the first voltage stabilizing circuit to provide a third power supply voltage to the power-consuming module, thereby meeting the voltage requirements of different power-consuming modules and improving the flexibility of the power supply system.

[0017] In some embodiments, the at least one voltage stabilization circuit includes a second voltage stabilization circuit, wherein:

[0018] The second voltage stabilizing circuit is connected to the output end of the second voltage conversion circuit and is used for performing voltage conversion on the second power supply voltage to obtain a third power supply voltage.

[0019] Through the above technical means, the second power supply voltage is converted through the second voltage stabilizing circuit to provide the third power supply voltage to the power-consuming module, thereby meeting the voltage requirements of different power-consuming modules and improving the flexibility of the power supply system.

[0020] In some embodiments, the at least one voltage stabilization circuit includes a third voltage stabilization circuit, wherein:

[0021] The third voltage stabilizing circuit is connected to the output end of the input power supply and is used for performing voltage conversion on the input voltage to obtain a third power supply voltage.

[0022] Through the above technical means, the input voltage is converted through the third voltage stabilizing circuit to provide a third power supply voltage to the power-consuming module, thereby meeting the voltage requirements of different power-consuming modules and improving the flexibility of the power supply system.

[0023] In some embodiments, the at least one voltage stabilizing circuit further comprises a fourth voltage stabilizing circuit, wherein:

[0024] The fourth voltage stabilizing circuit is connected to the output end of the third voltage stabilizing circuit, and is used for performing voltage conversion on the third power supply voltage output by the third voltage stabilizing circuit to obtain a fourth power supply voltage.

[0025] Through the above technical means, the third power supply voltage is converted through the fourth voltage stabilizing circuit to provide the fourth power supply voltage to the power-consuming module, thereby meeting the voltage requirements of different power-consuming modules and improving the flexibility of the power supply system.

[0026] In some embodiments, the power supply system further comprises a detection circuit, wherein:

[0027] The detection circuit is connected to the output end of the power module in the power supply system, and is used to detect the output signal of the power module; wherein the power module includes at least one of the following: a first voltage conversion circuit, a second voltage conversion circuit and at least one voltage stabilizing circuit.

[0028] Through the above technical means, the detection circuit detects one or more circuits in the power module to avoid abnormal output signals, protect the power-consuming module, and improve the safety of the power supply system.

[0029] In some embodiments, the detection circuit includes at least one voltage sampling circuit, wherein:

[0030] At least one voltage sampling circuit is connected to the output end of the power module respectively, and is used to perform voltage sampling detection on the output signal of the power module to obtain at least one voltage sampling signal;

[0031] The output signal of the power supply module includes at least one of the following: a first power supply voltage, a second power supply voltage and at least one third power supply voltage.

[0032] Through the above technical means, the voltage sampling circuit is used to perform voltage sampling detection on the output signal of one or more circuits in the power module, thereby preventing the output signal voltage from being too high or too low and causing damage to the power-consuming module, thereby improving the safety of the power supply system.

[0033] In some embodiments, the voltage sampling circuit includes a first resistor, a second resistor, a third resistor and a first capacitor, wherein:

[0034] The first end of the first resistor is connected to the output end of the power module, the second end of the first resistor is connected to the first end of the second resistor and the first end of the third resistor respectively, the second end of the second resistor is grounded, and the second end of the first capacitor is grounded;

[0035] The second end of the third resistor is connected to the first end of the first capacitor and is used to output a voltage sampling signal.

[0036] Through the above technical means, the voltage is sampled by a voltage-dividing resistor, which prevents the output signal voltage from being too high or too low and causing damage to the power module, thereby improving the safety of the power supply system.

[0037] In some embodiments, the detection circuit includes at least one current sampling circuit, wherein:

[0038] At least one current sampling circuit is connected to the output end of the power module respectively, and is used to perform current sampling detection on the output signal of the power module to obtain at least one current sampling signal;

[0039] The output signal of the power module includes at least one of the following: a first power supply current output by a first voltage conversion circuit, a second power supply current output by a second voltage conversion circuit, and at least one third power supply current output by at least one voltage stabilization circuit.

[0040] Through the above technical means, current sampling and detection are performed on the output signals of one or more circuits in the circuit of the power module to avoid damage to the power-consuming module caused by the current value of the output signal being too high or too low, thereby improving the safety of the power supply system.

[0041] In some embodiments, the first voltage conversion circuit is also used to receive a wake-up signal, and when the wake-up signal is at a low level, control the first voltage conversion circuit to be in a disconnected state to power off the power supply system; or, when the wake-up signal is at a high level, control the first voltage conversion circuit to be in a working state to power on the power supply system.

[0042] Through the above technical means, the first voltage conversion circuit is controlled by the wake-up signal, and then the power-on and power-off of the power supply system are controlled, so that the power supply system can enter a lower power consumption state as much as possible when it does not need to work, thereby saving the power consumption of the power supply system.

[0043] In some embodiments, the power supply system further includes an enabling circuit, which is respectively connected to an enabling terminal of the second voltage conversion circuit and an enabling terminal of at least one voltage stabilizing circuit, wherein:

[0044] an enabling circuit, configured to send a first enabling signal to the second voltage conversion circuit, and control power-on or power-off of the second voltage conversion circuit according to the first enabling signal;

[0045] The enabling circuit is further used to send a respective second enabling signal to at least one voltage stabilizing circuit, and to control the power-on or power-off of at least one voltage stabilizing circuit according to the second enabling signal.

[0046] Through the above technical means, the enable signal output by the enable circuit controls the power-on or power-off of the second voltage conversion circuit and at least one voltage stabilizing circuit respectively, thereby reducing the power consumption of the power supply system and improving the flexibility of the power supply system.

[0047] In some embodiments, the first voltage conversion circuit and the second voltage conversion circuit are buck-boost DC conversion circuits.

[0048] Through the above technical means, the first voltage conversion circuit and the second voltage conversion circuit are set as buck-boost DC conversion circuits to supply power to power modules that require DC voltage, thereby meeting the power supply requirements of different power modules. In a second aspect, an embodiment of the utility model provides a battery management system, the battery management system comprising at least one functional circuit and a power supply system as in the first aspect;

[0049] The power supply system is used to provide the power supply required by at least one functional circuit.

[0050] Through the above technical means, the power supply system provides power supply to at least one functional circuit, meets the power demand of at least one functional circuit, and improves the accuracy and stability of the power supply in the battery management system.

[0051] The utility model provides a power supply system and a battery management system, which convert the input voltage into a first power supply voltage, a second power supply voltage and at least one third power supply voltage respectively through different voltage conversion combinations between a first voltage conversion circuit, a second voltage conversion circuit and a voltage stabilizing circuit. In this way, not only can a separate multi-stage power supply system be used to replace the function of an SBC and provide a variety of power supply voltages, thereby improving the stability and flexibility of the circuit, but also the circuit design hardware cost is saved and the problem of SBC supply risk is solved.

[0052] The utility model mainly provides a battery management system, a battery pack and an electric vehicle for an electric vehicle. Through multiple voltage conversion methods, not only can a separate multi-stage power supply system be used to replace the function of an SBC and provide multiple power supply voltages, but also the hardware cost of the product is reduced and the stability and design flexibility of the circuit are improved. The utility model provides a separate power supply design to enrich user choices.

[0053] The technical solution of the utility model is achieved in this way:

[0054] In a third aspect, an embodiment of the utility model provides a battery management system for an electric vehicle, wherein the battery management system for the electric vehicle includes a power supply system, the power supply system is a separate type, and the power supply system includes:

[0055] The power supply terminal is used to access the input voltage provided by the input power supply;

[0056] A first voltage conversion circuit, the first voltage conversion circuit is connected to the power supply terminal and is used to perform voltage conversion on an input voltage provided by an input power supply to generate a first supply voltage;

[0057] A second voltage conversion circuit, the second voltage conversion circuit is connected to the output end of the first voltage conversion circuit, and is used to perform voltage conversion on the first supply voltage to obtain a second supply voltage;

[0058] At least one voltage stabilizing circuit is respectively connected to at least one of the power supply terminal, the output terminal of the first voltage conversion circuit and the output terminal of the second voltage conversion circuit, and is used to perform voltage conversion on at least one of the input voltage, the first supply voltage and the second supply voltage to obtain at least one third supply voltage.

[0059] The separation type described in the embodiments of the present application means that the power supply system is composed of discrete devices, or the power supply system is composed of chips or devices with single or simple functions, such as voltage conversion chips, low voltage drop linear regulators, etc. Since the power supply system in the embodiments of the present application is separation type, it is different from the integrated power supply system such as SBC, and thus provides a new power supply design to enrich user choices.

[0060] Through the above-mentioned technical means, the input voltage is converted through a first voltage conversion circuit, and then converted through a second voltage conversion circuit and at least one voltage stabilizing circuit for multi-branch conversion, so as to provide a first power supply voltage, a second power supply voltage and at least one third power supply voltage to power modules with different voltage requirements. This not only realizes multi-level power supply and meets the power voltage requirements of different modules, but also improves the accuracy and stability of voltage regulation.

[0061] In some embodiments, the at least one voltage stabilization circuit includes a third voltage stabilization circuit, wherein:

[0062] The third voltage stabilizing circuit is connected to the power supply terminal and is used for performing voltage conversion on the input voltage to obtain a third power supply voltage.

[0063] Through the above technical means, the input voltage is converted through the third voltage stabilizing circuit to provide a third power supply voltage to the power-consuming module, thereby meeting the voltage requirements of different power-consuming modules and improving the flexibility of the power supply system.

[0064] In some embodiments, the first voltage conversion circuit is also used to receive a wake-up signal, and when the wake-up signal is at a low level, the first voltage conversion circuit is in a disconnected state to power off the circuit where the first voltage conversion circuit is located; or, when the wake-up signal is at a high level, the first voltage conversion circuit is in a working state to power on the circuit where the first voltage conversion circuit is located.

[0065] The working or disconnecting state of the first voltage conversion circuit is controlled by the wake-up signal, thereby controlling the power-on and dormant power-off of the circuit where the first voltage conversion circuit is located. When the circuit where the first voltage conversion circuit is located does not need to work, it is made to enter a state of lower power consumption as much as possible, thereby saving the power consumption of the battery management system of the electric vehicle. In addition, the voltage stabilizing circuit connected to the power supply end is not affected by the power on and off of the first voltage conversion circuit, and can be in a state of continuous power-on operation to continuously supply power to the load.

[0066] In some embodiments, a battery management system for an electric vehicle includes at least one functional circuit;

[0067] The power supply system is used to provide the power supply required by at least one functional circuit.

[0068] Through the above technical means, the power supply system provides power supply to at least one functional circuit, meets the power demand of at least one functional circuit, and improves the accuracy and stability of the power supply in the battery management system.

[0069] In a fourth aspect, an embodiment of the utility model provides a battery pack, which includes a battery and a battery management system for an electric vehicle as in the third aspect.

[0070] In a fifth aspect, an embodiment of the utility model provides an electric vehicle, which includes a battery management system of the electric vehicle as in the third aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1 A schematic diagram of the composition structure of an SBC chip;

[0072] Figure 2 A schematic diagram of the structure of a power supply system provided in an embodiment of the utility model Figure 1 ;

[0073] Figure 3 A schematic diagram of the structure of a power supply system provided in an embodiment of the utility model Figure 2 ;

[0074] Figure 4 A schematic diagram of the structure of a power supply system provided in an embodiment of the utility model Figure 3 ;

[0075] Figure 5 A schematic diagram of the structure of a power supply system provided in an embodiment of the utility model Figure 4 ;

[0076] Figure 6 A schematic diagram of the structure of a voltage sampling circuit provided in an embodiment of the utility model Figure 1 ;

[0077] Figure 7 A schematic diagram of the structure of a voltage sampling circuit provided in an embodiment of the utility model Figure 2 ;

[0078] Figure 8 A schematic diagram of the structure of a current sampling circuit provided by an embodiment of the utility model Figure 1 ;

[0079] Fig. 9 A schematic diagram of the structure of a current sampling circuit provided by an embodiment of the utility model Figure 2 ;

[0080] Fig.10 A schematic diagram of the structure of a power supply system provided in an embodiment of the utility model Figure 5 ;

[0081] Fig.11 A schematic diagram of the structure of a battery management system provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0082] In order to more thoroughly understand the features and technical contents of the embodiments of the present invention, the implementation of the embodiments of the present invention is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not intended to limit the embodiments of the present invention.

[0083] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the field of the present invention. The terms used herein are only for the purpose of describing the embodiments of the present invention and are not intended to limit the present invention.

[0084] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0085] It should also be pointed out that the terms "first\second\third" involved in the embodiments of the present invention are only used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of the present invention described here can be implemented in an order other than that illustrated or described here.

[0086] In the Battery Management System (BMS), multiple power supplies with different voltages are required to power each module. In related technologies, this function is implemented by the SBC chip, which is an integrated chip that includes wake-up, diagnosis, reset, power output and other functions. The SBC chip usually provides multiple external interfaces for outputting different voltages to different modules.

[0087] Figure 1 Figure 1 is a schematic diagram of the composition structure of an SBC chip. Figure 1 As shown, the SBC chip 101 may include multiple modules for voltage conversion, wherein the buck-boost module 1014, also known as the Buck / Boost module, is used to step down the input power supply voltage and supply power to other modules in the BMS. By way of example, the input power supply may be a battery with a voltage range of 11 to 15V, and the voltage output by the buck-boost module 1014 may be 7V or 5V; the first voltage stabilizing module 1015, also known as the LDO_uC module, is used to stabilize and step down the input power supply voltage and supply power to the main chip in the BMS; the second voltage stabilizing module 1016, also known as the LDO_Com module, is used to stabilize and step down the input power supply voltage and supply power to the communication module in the BMS; the third voltage stabilizing module 1018, also known as the LDO_Ref module, is used to stabilize and step down the input power supply voltage and supply power to the amplifier module. It can be understood that the output voltage of the first voltage stabilizing module 1015, the second voltage stabilizing module 1016, and the third voltage stabilizing module 1018 can be set according to the voltage requirement of the functional circuit, also referred to as the power module below, and can be 5V or 7V by way of example.

[0088] In the related art, the SBC chip 101 may further include a wake-up input module 1011, which may also be called a Wake Input module, for receiving an externally inputted wake-up signal to start the SBC chip.

[0089] The SBC chip 101 may further include a diagnosis module 1012, also referred to as a Diagnosis module, for determining whether an abnormality occurs in the operation status release of the SBC chip.

[0090] The SBC chip 101 may further include a reset module 1013, which may also be called a Watchdog / Reset module, and is used to restart or reset the SBC chip when an abnormality occurs in the operation of the SBC chip.

[0091] The SBC chip 101 may further include a tracking module 1017 , also referred to as a Tracker module, for networking and communication with other modules in the BMS.

[0092] Although the above SBC chip is used in BMS in related technologies to supply power to multiple power modules with different voltage requirements in BMS, the SBC in new energy vehicles is generally expensive and subject to market supply and demand, so users may face the disadvantages of high supply risk and high cost. Therefore, the design of a separate multi-level power supply system is particularly important.

[0093] Based on the above technical problems, the embodiments of the utility model provide a battery management system, a battery pack and an electric vehicle for an electric vehicle, which can convert the input voltage into a first power supply voltage, a second power supply voltage and at least one third power supply voltage respectively through different voltage conversion combinations between a first voltage conversion circuit, a second voltage conversion circuit and at least one voltage stabilizing circuit. In this way, not only can a separate multi-stage power supply system be used to replace the function of the SBC and provide a variety of power supply voltages, but also the hardware cost of the product is reduced and the stability and design flexibility of the circuit are improved. In addition, the utility model provides a separate power supply design to enrich user choices.

[0094] The present invention is further described in detail below through the accompanying drawings and specific embodiments.

[0095] See also Fig.11 An embodiment of the present application provides a battery management system 30 for an electric vehicle including a power supply system 20 .

[0096] It should be noted that the electric vehicle in this application refers to a vehicle that uses electric energy as the main or secondary power source and uses an electric motor to drive the wheels. The electric vehicle in this application includes but is not limited to pure electric vehicles and hybrid electric vehicles.

[0097] The battery management system 30 of the electric vehicle in the present application refers to a system applied in the field of electric vehicles and used for monitoring and charging and discharging management of the battery.

[0098] like Figure 2 As shown, the power supply system 20 is a separate type, and the power supply system 20 may include:

[0099] The power supply terminal is used to receive the input voltage provided by the input power supply 201 .

[0100] It should be noted that the power supply end in this article may also be referred to as the output end of the input power supply 201 .

[0101] A first voltage conversion circuit 202, the first voltage conversion circuit 202 is connected to the power supply terminal, and is used to perform voltage conversion on the input voltage provided by the input power supply 201 to generate a first supply voltage;

[0102] A second voltage conversion circuit 203, the second voltage conversion circuit 203 is connected to the output end of the first voltage conversion circuit 202, and is used to perform voltage conversion on the first supply voltage to obtain a second supply voltage;

[0103] At least one voltage stabilizing circuit 204 is respectively connected to at least one of the power supply terminal, the output terminal of the first voltage conversion circuit 202 and the output terminal of the second voltage conversion circuit 203, and is used to perform voltage conversion on at least one of the input voltage, the first supply voltage and the second supply voltage to obtain at least one third supply voltage.

[0104] In the embodiment of the utility model, the input power source 201 can be a battery in a battery pack or other power sources in the electric vehicle, such as a storage battery. It can also be an external power source outside the electric vehicle, such as a charging pile input source, which is not limited in this application.

[0105] It can be understood that the power module can be connected to the power supply end, the first voltage conversion circuit 202, the second voltage conversion circuit 203, and the voltage stabilizing circuit 204 according to the voltage requirement, and connected to the above input voltage, or the first power supply voltage, or the second power supply voltage, or the third power supply voltage. Therefore, the embodiment of the present application provides a multi-stage power supply system that provides multiple power supply voltages, improves the flexibility of the design, and expands the application scope of the battery management system.

[0106] It should be noted that a multi-level power supply system refers to a power supply system that outputs power supply voltages at multiple voltage levels. In addition, "multi-level" means that the power supply system can output power supply voltages at multiple voltage levels. For example, Figure 2 In the embodiment, the first supply voltage outputted by the input power supply 201 after voltage conversion by the first voltage conversion circuit 202 and the second voltage conversion circuit 203 is the first level voltage, and the second supply voltage outputted by the input power supply 201 after voltage conversion by the first voltage conversion circuit 202 and the second voltage conversion circuit 203 is the second level voltage. The first level voltage and the second level voltage may be equal or different.

[0107] An embodiment of the utility model provides a battery management system for an electric vehicle, which converts an input voltage through a first voltage conversion circuit, and then converts it through a second voltage conversion circuit and at least one voltage stabilizing circuit for multi-branch conversion, to provide a first power supply voltage, a second power supply voltage and at least one third power supply voltage to power modules with different voltage requirements, which not only increases the range and number of specifications of the power supply voltage, meets the power voltage requirements of different modules, but also improves the accuracy and stability of voltage regulation.

[0108] It should be noted that, on the one hand, "separate" means that the power supply system is composed of discrete devices. Discrete devices here refer to devices that can be used alone or in combination with other devices to complete specific circuit functions. The types of discrete devices can be resistors, capacitors, inductors, transistors, diodes, etc. In addition, "separate" is compared with "integrated". "Integrated" means that the components required for the circuit are wired and interconnected using semiconductor technology. The integrated circuit structure and components are complex, with many functions, and usually cannot be disassembled and reversed. The SBC mentioned above is an integrated type.

[0109] On the other hand, "separate" can also mean that the power supply system is composed of discrete devices or chips with simple functions. This is also compared to the "integrated" power supply system with complex functions. For example, a DCDC voltage conversion chip or a low voltage drop linear regulator that only has a single or simple function, the power supply system 20 composed of them is separate. The SBC mentioned above has complex functions such as wake-up, diagnosis, buck-boost output, etc. and is highly integrated, so it is an integrated power supply system.

[0110] Generally speaking, for those skilled in the art, English abbreviations such as DCDC and LDO generally refer to discrete devices or integrated chips. However, in the Chinese context, if "devices" or "devices" are clearly stated, such as low-dropout linear regulators and voltage converters, then for those skilled in the art, these "devices" or "devices" generally refer to discrete devices or chips with a single function and a low degree of integration. Furthermore, the power supply system composed of "devices" or "devices" is a separate type.

[0111] The power supply system in the battery management system in the embodiment of the utility model is separate, thereby reducing the difficulty of hardware selection and improving the flexibility of circuit design. In addition, since the power supply system in the embodiment of the present application is separate, it is different from the integrated power supply system such as SBC, so it can enrich user choices.

[0112] In some embodiments, Figure 3 As shown, the at least one voltage stabilizing circuit 204 includes a third voltage stabilizing circuit 2043, wherein: the third voltage stabilizing circuit 2043 is connected to the power supply end, and is used to perform voltage conversion on the input voltage to obtain a third power supply voltage.

[0113] In some embodiments, the first voltage conversion circuit 202 is also used to receive a wake-up signal, and when the wake-up signal is at a low level, the first voltage conversion circuit 202 is in a disconnected state to power off the circuit where the first voltage conversion circuit 202 is located; or, when the wake-up signal is at a high level, the first voltage conversion circuit 202 is in a working state to power on the circuit where the first voltage conversion circuit 202 is located.

[0114] In addition, the loop in the embodiment of the present application refers to a closed path in which current can flow from the positive pole to the negative pole of the power supply. For example, Figure 2 The input power supply 201, the power supply terminal, the first voltage conversion circuit 202 and the second voltage conversion circuit 203 form a loop. The input power supply 201, the power supply terminal and the third voltage stabilizing circuit 2043 form a loop. The first voltage conversion circuit 202 and the third voltage stabilizing circuit 2043 are in parallel relationship, and the two cannot form a loop.

[0115] It should also be noted that the high level in the embodiment of the present application is relative to the low level in the present application, that is, the voltage value of the high level is greater than the voltage value of the low level.

[0116] It can be understood that when the input wake-up signal is at a high level, the first voltage conversion circuit 202 is powered on and started, and the second voltage conversion circuit 203, the first voltage stabilizing circuit 2041, and the second voltage stabilizing circuit 2042 connected to the first voltage conversion circuit 202 are also powered on and started; when the input wake-up signal is at a low level, the first voltage conversion circuit 202 is powered off, and the second voltage conversion circuit 203, the first voltage stabilizing circuit 2041, and the second voltage stabilizing circuit 2042 in the same loop as the first voltage conversion circuit 202 are also powered off and stop outputting the supply voltage.

[0117] In one embodiment, see Figure 2 , the third voltage stabilizing circuit 2043 is connected to the power supply end, and is not in the same loop as the first voltage conversion circuit 202. Therefore, the disconnection or operation of the first voltage conversion circuit 202 will not affect the power on and off of the third voltage stabilizing circuit 2043, and the two are independent of each other. In addition, the loop where the first voltage conversion circuit 202 is located can stop supplying power to the load, while the third voltage stabilizing circuit 2043 continues to supply power to the load.

[0118] The embodiment of the utility model controls the first voltage conversion circuit through a wake-up signal, and controls the power-on and power-off of the circuit where the first voltage conversion circuit is located. Therefore, the circuit where the first voltage conversion circuit is located can be powered off when it is not needed, thereby reducing the power consumption of the battery management system without affecting the power on and off of other circuits.

[0119] Based on the same technical concept, the present application also provides a battery pack, which includes a battery and a battery management system for an electric vehicle as described above. The embodiments of the battery pack can refer to the embodiments of the battery management system mentioned above, and the repeated parts will not be repeated.

[0120] It should be noted that the battery pack in the present application refers to a device that can output electrical energy. The battery in the present application can be at least one battery cell (battery cell) or a battery module composed of multiple battery cells.

[0121] Based on the same technical concept, the present application also provides an electric vehicle, which includes a battery management system for the electric vehicle as described above. The embodiments of the electric vehicle can refer to the embodiments of the battery management system in the above text, and the repeated parts will not be repeated.

[0122] Based on the above technical problems, the embodiments of the utility model provide a power supply system and a battery management system, which can convert the input voltage into a first power supply voltage, a second power supply voltage and at least one third power supply voltage respectively through different voltage conversion combinations between a first voltage conversion circuit, a second voltage conversion circuit and at least one voltage stabilizing circuit. In this way, not only can a separate multi-stage power supply system be used to replace the function of the SBC and provide a variety of power supply voltages, but also the hardware cost of the product is reduced and the stability of the circuit and the design flexibility are improved.

[0123] The present invention is further described in detail below through the accompanying drawings and specific embodiments.

[0124] Figure 2 A schematic diagram of the structure of a power supply system provided in an embodiment of the utility model Figure 1 .

[0125] like Figure 2 As shown, the power supply system 20 may include:

[0126] An input power supply 201, used to provide an input voltage;

[0127] A first voltage conversion circuit 202, the first voltage conversion circuit 202 is connected to the output end of the input power supply 201, and is used to perform voltage conversion on the input voltage provided by the input power supply 201 to generate a first supply voltage;

[0128] A second voltage conversion circuit 203, the second voltage conversion circuit 203 is connected to the output end of the first voltage conversion circuit 202, and is used to perform voltage conversion on the first supply voltage to obtain a second supply voltage;

[0129] At least one voltage stabilizing circuit 204 is respectively connected to at least one of the output end of the input power supply 201, the output end of the first voltage conversion circuit 202 and the output end of the second voltage conversion circuit 203, and is used to perform voltage conversion on at least one of the input voltage, the first supply voltage and the second supply voltage to obtain at least one third supply voltage.

[0130] In the embodiment of the utility model, the input power source 201 can be a battery with a voltage range of 11V to 15V. The positive electrode of the battery, that is, the KL30 terminal, can be connected to the input terminal of the first voltage conversion circuit 202 to provide the first voltage conversion circuit 202 with an input voltage in the voltage range of 11V to 15V.

[0131] It is understandable that the voltage range of the battery serving as the input power source 201 may also be other values, which are specifically determined according to the voltage requirements of the power consumption modules in the BMS.

[0132] In the embodiment of the present utility model, the first voltage conversion circuit 202 can perform voltage conversion on the input voltage provided by the input power source 201 to generate a first power supply voltage.

[0133] Among them, the first voltage conversion circuit 202 can be a buck-boost converter, which can buck or boost the input voltage and output a stable voltage less than or greater than the input voltage as the first supply voltage. It can be understood that according to the voltage conversion requirements of different specific scenarios, the first voltage conversion circuit 202 can also be a more efficient Buck converter, which is only used to buck the input voltage; or a Boost converter, which is only used to boost the input voltage.

[0134] In the embodiment of the utility model, the input power supply 201 is a DC power supply. If the power module in the BMS is also a DC voltage, the first voltage conversion circuit 202 can be a DC-DC type buck-boost converter. It can be understood that, according to the different voltage types of the input power supply 201 and the power module, the first voltage conversion circuit 202 can also be a DC-AC type buck-boost converter, an AC-DC type buck-boost converter, or an AC-AC type buck-boost converter.

[0135] Exemplarily, when the input power source 201 is a battery, the input voltage range provided to the first voltage conversion circuit 202 through the KL30 terminal may be 11V to 15V, and after the first voltage conversion circuit 202 performs voltage conversion, the output first supply voltage may be 7.0V.

[0136] In the embodiment of the utility model, the second voltage conversion circuit 203 can perform voltage conversion on the first power supply voltage to obtain the second power supply voltage.

[0137] In an embodiment of the utility model, the second voltage conversion circuit 203 can be a buck-boost converter of the same type as the first voltage conversion circuit 202, or a buck-boost converter of a different type from the first voltage conversion circuit 202, which is determined according to the voltage conversion requirements.

[0138] After the first voltage conversion circuit 202 converts the input voltage once, the output first supply voltage may still not reach the required voltage of some power-consuming modules due to the voltage conversion range. In this case, the second voltage conversion circuit 203 can perform voltage conversion on the first supply voltage again, step up or step down the first supply voltage again, and output the second supply voltage.

[0139] For example, if the first supply voltage output by the first voltage conversion circuit 202 is 7.0V, after the second voltage conversion circuit 203 performs voltage conversion again, the output second supply voltage may be 3.3V.

[0140] In the embodiment of the present invention, at least one voltage stabilizing circuit 204 may be used to perform voltage conversion on at least one of the input voltage, the first power supply voltage and the second power supply voltage to obtain at least one third power supply voltage.

[0141] The voltage stabilizing circuit 204 may be a low dropout regulator (LDO), which is a DC or AC regulator that can step down and stabilize an input voltage.

[0142] like Figure 2 As shown, the voltage stabilizing circuit 204 may include multiple types, each type of voltage stabilizing circuit is connected to the output end of different circuits, such as the first voltage stabilizing circuit 2041, the second voltage stabilizing circuit 2042, the third voltage stabilizing circuit 2043, etc., wherein each type of voltage stabilizing circuit 204 may include multiple circuits that output different supply voltages. Below, taking the first voltage stabilizing circuit 2041, the second voltage stabilizing circuit 2042, and the third voltage stabilizing circuit 2043 as an example, the connection method of each type of voltage stabilizing circuit 204 is described.

[0143] In the embodiment of the utility model, the first voltage stabilizing circuit 2041 can also be connected to the output end of the first voltage conversion circuit 202 to perform voltage conversion on the first supply voltage to obtain at least one third supply voltage. It can be understood that the voltage of the third supply voltage output by different voltage stabilizing circuits 204 can be different. For example, if the first supply voltage is 7.0V, after the voltage stabilizing circuit 204 steps down and stabilizes the voltage, the output third supply voltage can be 5.0V.

[0144] In the embodiment of the utility model, a second voltage stabilizing circuit 2042 may be further provided, connected to the output end of the second voltage conversion circuit 203, to perform voltage conversion on the second supply voltage to obtain at least one third supply voltage. It can be understood that the voltage of the third supply voltage output by different voltage stabilizing circuits 204 may be different. For example, if the second supply voltage is 3.3V, after the voltage stabilizing circuit 204 steps down and stabilizes the voltage, the output third supply voltage may be 1.2V.

[0145] In the embodiment of the utility model, a third voltage stabilizing circuit 2043 may be provided, connected to the output end of the input power supply 201, and the input voltage is converted to obtain at least one third power supply voltage. It can be understood that the voltage of the third power supply voltage output by different voltage stabilizing circuits 204 may be different. Exemplarily, when the input power supply 201 is a battery, its voltage range is 11V to 15V, and after the voltage stabilizing circuit 204 steps down and stabilizes the voltage, the output third power supply voltage may be 5.0V.

[0146] It should be noted that the multiple third voltage stabilizing circuits 2043 in the voltage stabilizing circuit 204 can be connected to the output end of the above-mentioned input power supply 201, the multiple first voltage stabilizing circuits 2041 in the voltage stabilizing circuit 204 can be connected to the output end of the first voltage conversion circuit 202, and the multiple second voltage stabilizing circuits 2042 in the voltage stabilizing circuit 204 can be connected to the output end of the second voltage conversion circuit 203. The connection method and quantity are determined according to the needs of the power consumption module, and the embodiments of the utility model are not listed one by one here.

[0147] It can be understood that the power consumption module can be connected to one of the output ends of the input power supply 201, the output end of the first voltage conversion circuit 202, the output end of the second voltage conversion circuit 203, and the output end of the voltage stabilizing circuit 204 according to the voltage requirements, and connected to the input voltage provided by any of the above output ends, or the first power supply voltage, or the second power supply voltage, or the third power supply voltage.

[0148] An embodiment of the utility model provides a power supply system, which converts an input voltage through a first voltage conversion circuit, and then converts it through a second voltage conversion circuit and at least one voltage stabilizing circuit for multi-branch conversion, so as to provide a first power supply voltage, a second power supply voltage and at least one third power supply voltage to power modules with different voltage requirements, thereby increasing the range and number of specifications of the power supply voltage, meeting the power voltage requirements of different modules, and improving the accuracy and stability of voltage regulation.

[0149] In another embodiment of the present invention, Figure 3 A schematic diagram of the structure of a power supply system provided in an embodiment of the utility model Figure 2 .like Figure 3As shown, the at least one voltage stabilizing circuit 204 may include a first voltage stabilizing circuit 2041, wherein: the first voltage stabilizing circuit 2041 is connected to the output end of the first voltage conversion circuit 202, and is used to perform voltage conversion on the first supply voltage to obtain a third supply voltage.

[0150] As in the above-mentioned embodiment, there may be multiple first voltage stabilizing circuits 2041, and the voltage values ​​of the output third power supply voltages may be the same or different. Figure 3 As shown, the first voltage stabilizing circuit 20411 can be called an LDO_uC module, which is used to output a third power supply voltage of 5.0V to the main chip; the first voltage stabilizing circuit 20412 can be called an LDO_communication module, which is used to output a third power supply voltage of 5.0V to the communication module; the first voltage stabilizing circuit 20413 can be called an LDO_Analog module, which is used to output a third power supply voltage of 5.0V to the analog module.

[0151] It can be understood that, in order to realize independent control of powering on and off of each power-consuming module, the voltage values ​​of the third power supply voltage output by the first voltage stabilizing circuit 20411, the first voltage stabilizing circuit 20412, and the first voltage stabilizing circuit 20413 can be the same, and are respectively input to multiple power-consuming modules with the same required voltage. The voltage values ​​of the third power supply voltage output by the above circuits can also be different, and are respectively input to multiple power-consuming modules with different required voltages. In addition, if space saving is considered, multiple power-consuming modules with the same required voltage can be combined and powered by the same first voltage stabilizing circuit 2041.

[0152] In some embodiments, continue to refer to Figure 3 The at least one voltage stabilizing circuit 204 may include a second voltage stabilizing circuit 2042, wherein the second voltage stabilizing circuit 2042 is connected to the output end of the second voltage conversion circuit 203, and is used to perform voltage conversion on the second supply voltage to obtain a third supply voltage.

[0153] The second voltage stabilizing circuit 2042 may be provided in multiple numbers, such as Figure 3 As shown, the embodiment of the utility model takes the second voltage stabilizing circuit 2042 as an example. After the input voltage provided by the input power supply 201 undergoes two voltage conversions by the first voltage conversion circuit 202 and the second voltage conversion circuit 203, the output second power supply voltage may still not meet the voltage requirements of some power-consuming modules due to voltage drop. The second voltage stabilizing circuit 2042 can perform voltage conversion on the second power supply voltage again and output a third power supply voltage to the power-consuming device.

[0154] Exemplarily, the second voltage stabilizing circuit 2042 may be an LDO_Core module, configured to output a third supply voltage of 1.2 V to the core power module.

[0155] In some embodiments, Figure 3 As shown, the at least one voltage stabilizing circuit 204 includes a third voltage stabilizing circuit 2043, wherein the third voltage stabilizing circuit 2043 is connected to the output end of the input power supply 201, and is used to perform voltage conversion on the input voltage to obtain a third power supply voltage.

[0156] The third voltage stabilizing circuit 2043 may be provided in multiple numbers, such as Figure 3 As shown, the embodiment of the utility model takes the third voltage stabilizing circuit 2043 as one example. The third voltage stabilizing circuit 2043 can be directly connected to the output end of the input power supply 201. When the first power supply voltage output by the first voltage conversion circuit 202 and the second power supply voltage output by the second voltage conversion circuit 203 cannot meet the voltage requirement of the power module, the third voltage stabilizing circuit 2043 can directly perform voltage conversion on the input voltage within the voltage drop range of the input voltage and output the third power supply voltage.

[0157] Exemplarily, the third voltage stabilizing circuit 2043 may be an LDO_CAN module, configured to output a third power supply voltage of 5.0 V to a controller area network (CNA) communication module.

[0158] In addition, the third voltage stabilizing circuit 2043 directly steps down the input voltage provided by the input power supply 201. Therefore, after the first voltage conversion circuit 202, the second voltage conversion circuit 203 and at least one voltage stabilizing circuit 204 are powered off, the third voltage stabilizing circuit 2043 can output a third power supply voltage to the power-consuming module to meet the load power supply demand when the power supply system 20 is in sleep mode.

[0159] In some embodiments, Figure 3 As shown, the at least one voltage stabilizing circuit 204 further includes a fourth voltage stabilizing circuit 2044, wherein the fourth voltage stabilizing circuit 2044 is connected to the output end of the third voltage stabilizing circuit 2043, and is used to perform voltage conversion on the third power supply voltage output by the third voltage stabilizing circuit 2043 to obtain a fourth power supply voltage.

[0160] The fourth voltage stabilizing circuit 2044 may be provided in plurality, such as Figure 3 As shown, the embodiment of the utility model takes the fourth voltage stabilizing circuit 2044 as an example. The fourth voltage stabilizing circuit 2044 can be connected to the output end of the third voltage stabilizing circuit 2043, and further step down the third supply voltage to output the fourth supply voltage to the electrical equipment.

[0161] Exemplarily, the fourth voltage stabilizing circuit 2044 may be a LDO_RTC module, configured to provide a fourth power supply voltage of 3.3V to a real time clock (RTC).

[0162] It should be noted that Figure 3The number and output voltage range of the first voltage stabilizing circuit 2041, the second voltage stabilizing circuit 2042, the third voltage stabilizing circuit 2043, and the fourth voltage stabilizing circuit 2044 shown are only examples, and the actual number and output voltage range can be determined according to the specific situation of the power module. For example, the output end of the above voltage stabilizing circuit can also be connected to at least one voltage stabilizing circuit, which is not listed here in the utility model.

[0163] An embodiment of the utility model provides a power supply system, including a first voltage stabilizing circuit, a second voltage stabilizing circuit, a third voltage stabilizing circuit and a fourth voltage stabilizing circuit, so that the input voltage is converted through the voltage of a multi-branch voltage stabilizing circuit and multiple third power supply voltages are output, thereby meeting the voltage requirements of different power modules and improving the flexibility of the power supply system.

[0164] In another embodiment of the present invention, Figure 4 A schematic diagram of the structure of a power supply system provided in an embodiment of the utility model Figure 3 .like Figure 4 As shown, the power supply system 20 also includes a detection circuit 206, wherein: the detection circuit 206 is connected to the output end of the power module 205 in the power supply system 20, and is used to detect the output signal of the power module 205; wherein the power module 205 includes at least one of the following: a first voltage conversion circuit 202, a second voltage conversion circuit 203 and at least one voltage stabilizing circuit 204.

[0165] The power supply system 20 may also be provided with a detection circuit 206, which may also be called a Diagnosis module. By setting a detection point at the output end of any circuit among the first voltage conversion circuit 202, the second voltage conversion circuit 203 and at least one voltage stabilizing circuit 204, the current, voltage, temperature or other output signal output by any of the above circuits is sampled, so that the detection circuit 206 can accurately determine the output current value, voltage value and other information to avoid abnormal output of the power supply system 20.

[0166] The detection circuit 206 can be a multimeter capable of detecting voltage and current, an oscilloscope capable of displaying voltage and current waveforms, a current clamp meter capable of detecting voltage and current, or other circuits capable of detecting voltage and current, which are not listed here one by one in the utility model.

[0167] It can be understood that the detection circuit 206 can perform comprehensive detection on the signals output by one of the first voltage conversion circuit 202, the second voltage conversion circuit 203 and the at least one voltage stabilizing circuit 204, or multiple of them, or all of the circuits. Figure 4 The following description is made by taking the detection circuit 206 detecting all the above circuits as an example, and the actual connection is determined according to specific detection requirements.

[0168] In some embodiments, Figure 5 A schematic diagram of the structure of a power supply system provided in an embodiment of the utility model Figure 4 .like Figure 5 As shown, the detection circuit 206 includes at least one voltage sampling circuit 2061, wherein: at least one voltage sampling circuit 2061 is respectively connected to the output end of the power supply module 205, and is used to perform voltage sampling detection on the output signal of the power supply module 205 to obtain at least one voltage sampling signal; wherein, the output signal of the power supply module 205 includes at least one of the following: a first supply voltage, a second supply voltage and at least one third supply voltage.

[0169] Understandably, Figure 5 The figure only shows one connection mode between the voltage sampling circuit 2061 and the power module 205. The number of the voltage sampling circuits 2061 can be set according to the actual functional safety requirements. In addition, according to the voltage values ​​of the first power supply voltage, the second power supply voltage and the third power supply voltage in the output signal, a voltage sampling circuit 2061 can be set at the output end of each circuit in the power module 205, and the output signal of each circuit can be sampled and detected to output at least one voltage sampling signal.

[0170] The voltage sampling circuit 2061 may be a voltage-dividing resistor sampling circuit, or a battery sampling chip (analog front end, AFE) in a BMS capable of collecting voltage signals, or other circuits capable of collecting voltage signals.

[0171] In some embodiments, Figure 6 A schematic diagram of the structure of a voltage sampling circuit provided in an embodiment of the utility model Figure 1 . See Figure 6 The voltage sampling circuit 2061 includes a first resistor 20611, a second resistor 20612, a third resistor 20613 and a first capacitor 20614, wherein: the first end of the first resistor 20611 is connected to the output end of the power supply module 205, the second end of the first resistor 20611 is respectively connected to the first end of the second resistor 20612 and the first end of the third resistor 20613, the second end of the second resistor 20612 is grounded, and the second end of the first capacitor 20614 is grounded; the second end of the third resistor 20613 is connected to the first end of the first capacitor 20614, for outputting a voltage sampling signal.

[0172] The voltage sampling circuit 2061 can use a voltage dividing resistor for sampling. Figure 6 When the connection mode is , a voltage sampling signal is generated by sampling the voltage across the second resistor 20612.

[0173] In some embodiments, Figure 7 A schematic diagram of the structure of a voltage sampling circuit provided in an embodiment of the utility model Figure 2 .like Figure 7 As shown, another connection method of the voltage sampling circuit 2061 can be: the first end of the first resistor 20611 is connected to the output end of the power supply module 205, the second end of the first resistor 20611 is respectively connected to the first end of the second resistor 20612 and the first end of the first capacitor 20614, the second end of the second resistor 20612 is respectively connected to the first end of the third resistor 20613 and the second end of the first capacitor 20614, the voltage sampling signal is output through the two ends of the first capacitor 20614, and the second end of the third resistor 20613 is grounded.

[0174] Figure 7 The figure shows another connection mode when the voltage sampling circuit 2061 uses a voltage dividing resistor for sampling. In this connection mode, the voltage across the second resistor 20612 is sampled to generate a voltage sampling signal.

[0175] In the embodiment of the present utility model, the voltage sampling circuit 2061 can adopt the above Figure 6 or Figure 7 Any connection method in the above example can be used, or other circuits can be used for voltage detection. It can be understood that for the output end of the same circuit, the voltage sampling circuit 2061 adopts Figure 6 or Figure 7 When different connection modes are used, due to different sampling modes, the resistance values ​​of the first resistor 20611, the second resistor 20612, and the third resistor 20613 may be different. In addition, for current output terminals with different voltage values, the voltage sampling circuit 2061 adopts Figure 6 or Figure 7 When one of the connection modes is used, due to different sampled voltages, the resistance values ​​of the first resistor 20611, the second resistor 20612, and the third resistor 20613 may also be different.

[0176] In another embodiment of the present invention, Figure 5 As shown, the detection circuit 206 may further include at least one current sampling circuit 2062, wherein: at least one current sampling circuit 2062 is respectively connected to the output end of the power supply module 205, and is used to perform current sampling detection on the output signal of the power supply module 205 to obtain at least one current sampling signal; wherein the output signal of the power supply module 205 includes at least one of the following: a first power supply current output by the first voltage conversion circuit 202, a second power supply current output by the second voltage conversion circuit 203, and at least one third power supply current output by at least one voltage stabilization circuit 204.

[0177] In the embodiment of the present utility model, Figure 5The figure shows an example of a connection mode of the current sampling circuit 2062 . The current sampling circuit 2062 can also be respectively set at the output end of one or more circuits among the first voltage conversion circuit 202 , the second voltage conversion circuit 203 and the at least one voltage stabilizing circuit 204 .

[0178] The current sampling circuit 2062 may be a circuit including a current sampling resistor, or a circuit including a current sampling resistor and an operational amplifier, or other circuits capable of detecting current, which are not specifically limited herein.

[0179] In some embodiments, Figure 8 A schematic diagram of the structure of a current sampling circuit provided in an embodiment of the utility model Figure 1 .like Figure 8 As shown, taking the power module 205 as a DCDC voltage conversion chip as an example, the above-mentioned current sampling circuit 2062 can be a current sampling resistor, and the output terminal VOUT of the DCDC voltage conversion chip is connected to the current sampling resistor, and one end of the current sampling resistor is connected to the ISN port, and the other end of the current sampling resistor is connected to the ISP port. Here, sampling is performed through the current sampling resistor to generate a current sampling signal. In addition, as Figure 8 As shown in the figure, VOUT' is the voltage signal obtained after the VOUT port of the DCDC voltage conversion chip passes through the current sampling resistor. Since the voltage drop on the current sampling resistor is small and can be ignored, the voltage at the VOUT port is approximately equal to the output voltage at VOUT'.

[0180] It can be understood that the resistance value of the current sampling resistor 20621 may be different according to the different current values ​​of the first power supply current, the second power supply current and at least one third power supply current output by the circuit in the power module 205 connected to the current sampling circuit 2062.

[0181] In some embodiments, Fig. 9 A schematic diagram of the structure of a current sampling circuit provided in an embodiment of the utility model Figure 2 .like Fig. 9 As shown, taking the power module 205 as the first voltage conversion circuit or the second voltage conversion circuit as an example, the current sampling circuit 2062 can also be a current transformer, and the output terminal VOUT of the DCDC voltage conversion chip is connected to the current transformer, and one end of the current transformer is connected to the ISN port, and the other end of the current transformer is connected to the ISP port. Here, sampling is performed through the current transformer to generate a current sampling signal. In addition, as Fig. 9As shown in FIG. 1 , VOUT' is the voltage signal obtained by the VOUT port of the DCDC voltage conversion chip through the current transformer. Since the voltage drop on the current transformer is small and can be ignored, the voltage at the VOUT port is approximately equal to the output voltage at VOUT'.

[0182] The embodiment of the utility model provides a power supply system, in which the detection circuit includes a current sampling circuit and a voltage sampling circuit, which detects the output signal of one or more circuits in the power supply module to avoid damage to the power-consuming module caused by abnormal output signals, thereby protecting the power-consuming module and improving the safety of the power supply system.

[0183] In another embodiment of the present invention, Fig.10 A schematic diagram of the structure of a power supply system provided in an embodiment of the utility model Figure 5 .like Fig.10 As shown, the first voltage conversion circuit 202 is also used to receive a wake-up signal, and when the wake-up signal is at a low level, control the first voltage conversion circuit 202 to be in a disconnected state so as to power off the power supply system 20; or, when the wake-up signal is at a high level, control the first voltage conversion circuit 202 to be in a working state so as to power on the power supply system 20.

[0184] The wake-up signal may be provided by a controller that controls the power supply system 20 , and the controller may be a microcontroller unit (MCU) in the BMS.

[0185] It can be understood that when the input wake-up signal is at a high level, the first voltage conversion circuit 202 is powered on and started, and the first power supply voltage is output. The second voltage conversion circuit 203 and at least one voltage stabilizing circuit 204 connected to the first voltage conversion circuit 202 are also powered on and started, and the second power supply voltage and at least one third power supply voltage are output; when the input wake-up signal is at a low level, the first voltage conversion circuit 202 is powered off and the first power supply voltage is stopped from being output. The second voltage conversion circuit 203 and at least one voltage stabilizing circuit 204 connected to the first voltage conversion circuit 202 are also powered off and the second power supply voltage and at least one third power supply voltage are stopped from being output. In addition, as in the aforementioned embodiment, the wake-up signal is input to the third voltage stabilizing circuit 2043 and the fourth voltage stabilizing circuit 2044. Therefore, the third voltage stabilizing circuit 2043 and the fourth voltage stabilizing circuit 2044 can provide the third power supply voltage and the fourth power supply voltage to the power-consuming module after the first voltage conversion circuit 202 is powered off.

[0186] The embodiment of the utility model provides a power supply system, which controls the first voltage conversion circuit through a wake-up signal, and further controls the power-on and power-off of the power supply system, so that the power supply system enters a state of lower power consumption as much as possible when it does not need to work, thereby saving the power consumption of the power supply system.

[0187] In another embodiment of the present invention, Fig.10 As shown, the power supply system 20 may further include an enable circuit 207, which is respectively connected to an enable end of the second voltage conversion circuit 203 and an enable end of at least one voltage stabilizing circuit 204, wherein: the enable circuit 207 is used to send a first enable signal to the second voltage conversion circuit 203, and control the power on or off of the second voltage conversion circuit 203 according to the first enable signal.

[0188] In the embodiment of the present invention, the first enable signal output by the enable circuit 207 may be a signal that enables the second voltage conversion circuit 203 to output or not output the second supply voltage by activating or disabling the enable terminal of the second voltage conversion circuit 203 .

[0189] The enabling circuit 207 is further configured to send a respective second enabling signal to at least one voltage stabilizing circuit 204 , and control power-up or power-down of at least one voltage stabilizing circuit 204 according to the second enabling signal.

[0190] The first enable signal output by the enable circuit 207 may be a signal that enables the voltage stabilizing circuit 204 to output or not output the third supply voltage by activating or disabling the enable terminal of at least one voltage stabilizing circuit 204 .

[0191] Understandably, Fig.10 The figure shows only one connection mode of the enabling circuit 207. According to the circuit control requirements in the power supply system 20, the enabling module 207 can be connected to one or more of the second voltage conversion circuit 203 and at least one voltage stabilizing circuit 204, and respectively send an enabling signal to control the corresponding second voltage conversion circuit 203 or voltage stabilizing circuit 204 to power on or off.

[0192] An embodiment of the utility model provides a power supply system, including an enabling circuit, which controls the power-on or power-off of a second voltage conversion circuit and at least one voltage stabilizing circuit respectively through an enabling signal output by the enabling circuit, thereby reducing the power consumption of the power supply system and improving the flexibility of the power supply system.

[0193] In another embodiment of the present invention, the first voltage conversion circuit 202 and the second voltage conversion circuit 203 are buck-boost DC conversion circuits.

[0194] As in the aforementioned embodiments, the first voltage conversion circuit 202 and the second voltage conversion circuit 203 can both be buck-boost DC conversion circuits, which are used to boost or buck the DC input voltage input by the input power supply 201 and convert it into a DC first supply voltage, or to boost or buck the DC first supply voltage and convert it into a DC second supply voltage.

[0195] The embodiment of the utility model provides a power supply system, in which the first voltage conversion circuit and the second voltage conversion circuit are configured as buck-boost DC conversion circuits to supply power to power consumption modules requiring DC voltage, thereby meeting the power supply requirements of different power consumption modules.

[0196] In another embodiment of the present invention, Fig.11 The following is a schematic diagram of the structure of a battery management system 30 provided in an embodiment of the present utility model. Fig.11 As shown, the battery management system 30 includes at least one functional circuit 301 and the power supply system 20 as shown in the above embodiment; wherein the power supply system 20 is used to provide the at least one functional circuit 301 with the power supply required by each circuit.

[0197] The functional circuit 301 may be a power consumption module in the above-mentioned BMS system, and may also be called a load. For example, it may be a communication module, a main chip, a CAN communication module or other circuits.

[0198] The functional circuit 301 may include one or more, Fig.11 The functional circuit 301 shown is an example of connection with the power supply system 20 when it includes the first functional circuit 3011, the second functional circuit 3012, and the third functional circuit 3013. It can be understood that according to actual conditions, there can be multiple functional circuits 301, which are connected to the power supply system 20 according to their respective voltage requirements.

[0199] The embodiment of the utility model provides a battery management system, in which the power supply system 20 provides power supply required by at least one functional circuit, thereby meeting the voltage requirements of different functional circuits.

[0200] The above description is only a preferred embodiment of the present utility model and is not intended to limit the protection scope of the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

[0201] The embodiment of the utility model further provides a computer program product including instructions, which, when executed on a computer, enables the computer to execute the steps of the thermal control method provided in the above method embodiment.

[0202] It should be understood that the description of the above storage medium and device embodiments is similar to the description of the above method embodiments, and has similar beneficial effects as the method embodiments. For technical details not disclosed in the storage medium, storage medium and device embodiments of the present utility model, please refer to the description of the method embodiments of the present utility model for understanding.

[0203] It should be understood that "one embodiment" or "an embodiment" or "some embodiments" mentioned throughout the specification means that specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the utility model. Therefore, "in one embodiment" or "in one embodiment" or "in some embodiments" appearing throughout the specification may not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the utility model, the size of the sequence number of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the utility model. The above-mentioned sequence numbers of the embodiments of the utility model are for description only and do not represent the advantages and disadvantages of the embodiments. The above description of each embodiment tends to emphasize the differences between the embodiments, and the same or similar aspects can be referenced to each other. For the sake of brevity, this article will not repeat them.

[0204] It should also be noted that, in the present invention, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0205] The serial numbers of the above-mentioned embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0206] The methods disclosed in the several method embodiments provided by the present invention can be arbitrarily combined without conflict to obtain new method embodiments.

[0207] The features disclosed in several product embodiments provided by the present invention can be arbitrarily combined without conflict to obtain new product embodiments.

[0208] The features disclosed in several method or device embodiments provided by the present invention can be arbitrarily combined without conflict to obtain new method embodiments or device embodiments.

[0209] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

[0210] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A battery management system for electric vehicles, It is characterized in that The battery management system of the electric vehicle includes a power supply system, which is a separate power supply system and includes: The power supply terminal is used to access the input voltage provided by the input power supply; a first voltage conversion circuit, the first voltage conversion circuit being connected to the power supply terminal and configured to perform voltage conversion on an input voltage provided by the input power supply to generate a first supply voltage; a second voltage conversion circuit, the second voltage conversion circuit being connected to an output end of the first voltage conversion circuit and being used for performing voltage conversion on the first supply voltage to obtain a second supply voltage; At least one voltage stabilizing circuit, wherein the at least one voltage stabilizing circuit is respectively connected to at least one of the power supply terminal, the output terminal of the first voltage conversion circuit, and the output terminal of the second voltage conversion circuit, and is used to perform voltage conversion on at least one of the input voltage, the first supply voltage, and the second supply voltage to obtain at least one third supply voltage.

2. The battery management system for an electric vehicle according to claim 1, It is characterized in that The at least one voltage stabilizing circuit comprises a first voltage stabilizing circuit, wherein: The first voltage stabilizing circuit is connected to the output end of the first voltage conversion circuit, and is used for performing voltage conversion on the first supply voltage to obtain the third supply voltage.

3. The battery management system for an electric vehicle according to claim 1, It is characterized in that The at least one voltage stabilizing circuit comprises a second voltage stabilizing circuit, wherein: The second voltage stabilizing circuit is connected to the output end of the second voltage conversion circuit, and is used for performing voltage conversion on the second supply voltage to obtain the third supply voltage.

4. The battery management system for an electric vehicle according to claim 1, It is characterized in that The at least one voltage stabilizing circuit comprises a third voltage stabilizing circuit, wherein: The third voltage stabilizing circuit is connected to the power supply end and is used for performing voltage conversion on the input voltage to obtain the third power supply voltage.

5. The battery management system for an electric vehicle according to claim 4, It is characterized in that The at least one voltage stabilizing circuit further comprises a fourth voltage stabilizing circuit, wherein: The fourth voltage stabilizing circuit is connected to the output end of the third voltage stabilizing circuit and is used for performing voltage conversion on the third power supply voltage output by the third voltage stabilizing circuit to obtain a fourth power supply voltage.

6. The battery management system for an electric vehicle according to claim 1, It is characterized in that The power supply system also includes a detection circuit, wherein: The detection circuit is connected to the output end of the power module in the power supply system, and is used to detect the output signal of the power module; wherein the power module includes at least one of the following: the first voltage conversion circuit, the second voltage conversion circuit and the at least one voltage stabilizing circuit.

7. The battery management system for an electric vehicle according to claim 6, It is characterized in that The detection circuit includes at least one voltage sampling circuit, wherein: The at least one voltage sampling circuit is respectively connected to the output end of the power module, and is used to perform voltage sampling detection on the output signal of the power module to obtain at least one voltage sampling signal; The output signal of the power supply module includes at least one of the following: the first supply voltage, the second supply voltage and the at least one third supply voltage.

8. The battery management system for an electric vehicle according to claim 7, It is characterized in that The voltage sampling circuit includes a first resistor, a second resistor, a third resistor and a first capacitor, wherein: The first end of the first resistor is connected to the output end of the power module, the second end of the first resistor is connected to the first end of the second resistor and the first end of the third resistor respectively, the second end of the second resistor is grounded, and the second end of the first capacitor is grounded; The second end of the third resistor is connected to the first end of the first capacitor for outputting the voltage sampling signal.

9. The battery management system for an electric vehicle according to claim 6, It is characterized in that The detection circuit includes at least one current sampling circuit, wherein: The at least one current sampling circuit is respectively connected to the output end of the power module, and is used to perform current sampling detection on the output signal of the power module to obtain at least one current sampling signal; The output signal of the power module includes at least one of the following: a first power supply current output by the first voltage conversion circuit, a second power supply current output by the second voltage conversion circuit, and at least one third power supply current output by the at least one voltage stabilizing circuit.

10. The battery management system for an electric vehicle according to claim 1, It is characterized in that The first voltage conversion circuit is also used to receive a wake-up signal, and when the wake-up signal is at a low level, the first voltage conversion circuit is in a disconnected state to power off the circuit where the first voltage conversion circuit is located; or, when the wake-up signal is at a high level, the first voltage conversion circuit is in a working state to power on the circuit where the first voltage conversion circuit is located.

11. The battery management system for an electric vehicle according to claim 1, It is characterized in that The power supply system further includes an enabling circuit, which is respectively connected to an enabling terminal of the second voltage conversion circuit and an enabling terminal of the at least one voltage stabilizing circuit, wherein: The enabling circuit is configured to send a first enabling signal to the second voltage conversion circuit, and control power-on or power-off of the second voltage conversion circuit according to the first enabling signal; The enabling circuit is further used to send a respective second enabling signal to the at least one voltage stabilizing circuit, and to control the power-on or power-off of the at least one voltage stabilizing circuit according to the second enabling signal.

12. The battery management system of an electric vehicle according to any one of claims 1 to 11, It is characterized in that The first voltage conversion circuit and the second voltage conversion circuit are buck-boost DC conversion circuits.

13. The battery management system of an electric vehicle according to any one of claims 1 to 11, It is characterized in that The battery management system of the electric vehicle further comprises at least one functional circuit; The power supply system is used to provide the at least one functional circuit with the power supply required by the respective functional circuits.

14. A battery pack, It is characterized in that The battery pack comprises a battery and a battery management system for an electric vehicle according to any one of claims 1 to 13.

15. An electric car, It is characterized in that The electric vehicle comprises the battery management system for the electric vehicle according to any one of claims 1 to 13.

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