Battery management system, battery system and electric device

Abstract

The utility model provides a battery management system, a battery system and an electric device, and belongs to the technical field of batteries. The battery management system comprises: a DC-DC conversion device comprising: an input terminal for receiving a first DC voltage; the output end is used for outputting a second direct-current voltage converted based on the first direct-current voltage; the grounding end is used for providing a reference ground potential; the resistance adjusting circuit is used for inhibiting interference current transmitted to the DC-DC conversion device by the power utilization device under the condition that the battery management system is connected with the power utilization device, and the resistance adjusting circuit comprises a resistance circuit with an adjustable resistance value; and the control circuit is used for adjusting the resistance value of the resistance circuit according to the current flowing through the resistance adjusting circuit so as to suppress the interference current, and the resistance circuit comprises a plurality of resistance elements and a plurality of switch elements or comprises an adjustable resistance element. The battery management system can effectively suppress the amplitude of the interference signal and reduce the risk of abnormity caused by the interference signal.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery management system, a battery system, and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to sustainable social development. Rechargeable batteries, with their ability to store and release energy as needed, are widely used in various electrical devices and energy storage systems, and are an important component in promoting energy transition and sustainable development. For the new energy industry, battery technology is a crucial factor in its development.

[0003] As a crucial component of battery systems, DC-to-DC converters (DCDCs) work in conjunction with batteries to provide safe and stable power. However, due to interference signals such as power fluctuations in the circuit, DCDCs are highly susceptible to voltage drops and other anomalies, leading to power supply abnormalities. Utility Model Content

[0004] This application aims to at least address the technical problem in the prior art where DC-DC converters are easily interfered with by interference signals, leading to abnormalities. Therefore, one objective of this application is to provide a battery management system in which the DC-DC converter can effectively suppress the amplitude of interference signals introduced by external circuits, reduce the sensitivity of the DC-DC converter to interference signals, and reduce the risk of abnormalities caused by interference signals.

[0005] An embodiment of the first aspect of this application provides a battery management system, including: a DC-DC converter, comprising: an input terminal for receiving a first DC voltage; an output terminal for outputting a second DC voltage converted from the first DC voltage; a ground terminal for providing a reference ground potential; and a resistor adjustment circuit for suppressing interference current transmitted from the power device to the DC-DC converter when the battery management system is connected to a power device. The resistor adjustment circuit includes: a resistor circuit having an adjustable resistance value; and a control circuit for adjusting the resistance value of the resistor circuit according to the current flowing through the resistor adjustment circuit to suppress the interference current. The resistor circuit includes a plurality of resistive elements and a plurality of switching elements, wherein the plurality of resistive elements are connected in parallel, and the plurality of switching elements correspond one-to-one with the plurality of resistive elements and are respectively connected in series with the corresponding resistive elements; or the resistor circuit includes an adjustable resistive element, the resistance value of which is set by the control circuit according to the current flowing through the resistor adjustment circuit.

[0006] In the technical solution of this application embodiment, since a resistor adjustment circuit is connected to the ground terminal and / or output terminal of the DC-DC converter, interference signals introduced by external circuits can be effectively suppressed, reducing the impact of interference signals on the DC-DC converter. Adjusting the connected resistor according to the current in the circuit can effectively suppress interference current while reducing its impact on other functions. By setting multiple resistive elements and switching elements in the resistor circuit, the resistance value of the connected circuit can be changed by switching the switching elements, achieving flexible switching of the resistance value. By using adjustable resistive elements in the resistor circuit, flexible resistance adjustment can be achieved, while improving integration and simplifying circuit design.

[0007] In some embodiments, the battery management system further includes a current detection device for detecting the current flowing through the resistor regulation circuit. Detecting the current flowing through the resistor regulation circuit allows for accurate determination of the amplitude of interference signals in the DC-DC converter, thereby suppressing the interference signals.

[0008] In some embodiments, the current detection device includes: a detection resistor connected in series with a resistance adjustment circuit; and a current sampling element connected to the detection resistor, the current sampling element being used to acquire the current flowing through the detection resistor. By setting the detection resistor and the current sampling element, the current flowing through the resistance adjustment circuit can be acquired, thereby accurately determining the amplitude of the interference signal in the DC-DC converter.

[0009] In some embodiments, the resistor circuit is connected in series with the ground terminal and / or the output terminal. Connecting the resistor circuit in series with the ground terminal and / or the output terminal can effectively suppress interference signals on the ground loop and / or the power supply loop.

[0010] In some embodiments, adjusting the resistance value of the resistor circuit according to the current flowing through it to suppress interference current includes: determining a target resistor element from a plurality of resistor elements based on the current obtained from a current detection device; and turning on a switching element connected in series with the target resistor element. Based on the detected current, a target resistor element with a suitable resistance value can be determined from a plurality of resistor elements, and by connecting this target resistor element, effective suppression of interference signals can be achieved.

[0011] In some embodiments, adjusting the resistance value of the resistor circuit according to the current flowing through the resistor adjustment circuit to suppress interference current includes: determining a target resistance value based on the current obtained from the current detection device; and setting the resistance value of the adjustable resistor element to the target resistance value. Setting the resistance value of the adjustable resistor element according to the detected current enables the adjustable resistor element to effectively suppress interference signals.

[0012] An embodiment of the second aspect of this application provides a battery system, including: a battery management system as described in the above embodiments; a battery for providing electrical energy, the battery including: a battery output terminal for outputting a first DC voltage; and a battery ground for determining a reference ground potential of the battery system, wherein the input terminal of the DC-DC converter in the battery management system is connected to the battery output terminal of the battery, and the ground terminal of the DC-DC converter is connected to the battery ground of the battery. Because the resistance adjustment circuit is located inside the DC-DC converter, the number of components connected to the wiring harness in the battery system can be reduced, the volume occupied by the battery system can be reduced, and the circuit design of the battery system can be simplified.

[0013] In some embodiments, a resistor regulation circuit is connected in series between the ground terminal of the DC-DC converter and the battery ground. By connecting the resistor regulation circuit in series between the battery ground and the ground terminal of the DC-DC converter, interference signals on the ground loop can be effectively suppressed, and ground voltage fluctuations of the DC-DC converter can be reduced.

[0014] In some embodiments, the battery system further includes a load device connected to the output of a DC-DC converter. The battery and DC-DC converter enable normal power supply to the load device, improving the reliability of the power supply process.

[0015] In some embodiments, a resistor regulation circuit is connected in series between the output of the DC-DC converter and the load device. By connecting a resistor regulation circuit in series between the load device and the output of the DC-DC converter, interference signals in the power supply circuit can be effectively suppressed, and the stability of the power supply voltage can be improved.

[0016] An embodiment of the third aspect of this application provides an electrical device that includes the battery system described in the above embodiments.

[0017] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0018] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0019] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0020] Figure 2This is a schematic diagram of a DC-DC converter according to some embodiments of this application;

[0021] Figure 3 This is a schematic diagram of the resistance adjustment circuit of some embodiments of this application;

[0022] Figure 4 This is a schematic diagram of the resistance adjustment circuit of some embodiments of this application;

[0023] Figure 5 This is a schematic diagram of the resistance adjustment circuit of some embodiments of this application;

[0024] Figure 6 This is a schematic diagram of the resistance adjustment circuit of some embodiments of this application;

[0025] Figure 7 This is a schematic diagram of a battery system according to some embodiments of this application. Detailed Implementation

[0026] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0028] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0029] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0030] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0031] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0032] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0033] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0034] Currently, the application of rechargeable batteries is becoming increasingly widespread, judging from market trends. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in various electronic devices, such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As the application areas of rechargeable batteries continue to expand, the market demand is also constantly increasing.

[0035] As a crucial component of battery systems, DC-to-DC converters (DCDCs) work in conjunction with batteries to achieve safe and stable power supply. However, when battery systems are used in electrical devices such as vehicles, interference signals, such as power fluctuations, can easily enter the DCDC, causing voltage drops and other anomalies. For example, during the high-voltage connection process in a vehicle, the presence of parasitic capacitance in the circuit can generate significant power fluctuations at the moment the relay closes, resulting in interference signals on the ground loop. If the filtering circuit cannot effectively filter out these interference signals, they will enter the DCDC, causing its output voltage to drop. When the DCDC output voltage becomes abnormal, the Battery Management System (BMS) will report a fault, interrupting the high-voltage connection process and resulting in a high-voltage connection failure.

[0036] Currently, interference signal suppression typically involves connecting a filter capacitor in parallel at the power supply port of the DC-DC converter to filter out interference signals within a certain frequency range. However, this suppression method can only filter out interference signals at a portion of the frequency range. The frequency of interference signals entering the DC-DC converter is usually related to the load characteristics of the electrical device, such as the vehicle. The filter capacitor cannot effectively filter out interference signals across all frequency ranges, resulting in poor interference signal suppression performance in certain scenarios.

[0037] To improve the suppression of interference signals and reduce the risk of abnormal DC-DC output, a resistor adjustment circuit can be set in the DC-DC converter. By adjusting the resistor with a certain resistance value in the resistor adjustment circuit, interference signals of different frequencies can be effectively suppressed, enabling the DC-DC converter to work normally and improving the stability and reliability of the power supply process.

[0038] The battery management system disclosed in this application can be used, but is not limited to, in battery systems for electrical devices or energy storage devices such as vehicles, ships, or aircraft. A power system incorporating the battery management system disclosed in this application can be used to construct such an electrical device or energy storage device, which helps to suppress interference signals of different frequencies and improve the stability and reliability of the power supply process.

[0039] This application provides an electrical device that uses a battery system as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0040] This application also provides an energy storage device that uses a battery system as a power source. The energy storage device can be, but is not limited to, an energy storage container, an energy storage cabinet, an energy storage power station, an energy storage battery pack, or a portable energy storage system.

[0041] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0042] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery system 100 is installed inside the vehicle 1000, and the battery system 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery system 100 can be used to power the vehicle 1000; for example, the battery system 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a vehicle controller 200 and a motor 300. The vehicle controller 200 is used to control the battery system 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0043] In some embodiments of this application, the battery system 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0044] This application provides a battery management system. (See reference...) Figure 2 The battery management system 1 includes a DC-DC converter 10. The DC-DC converter 10 includes an input terminal IN, an output terminal OUT, a ground terminal GND, and a resistance adjustment circuit 11.

[0045] The IN input terminal is used to receive the first DC voltage.

[0046] The output terminal OUT is used to output the second DC voltage based on the first DC voltage.

[0047] The grounding terminal GND is used to provide a reference ground potential.

[0048] The resistor regulation circuit 11 is used to suppress interference current transmitted from the power device to the DC-DC converter 10 when the battery management system 1 is connected to the power device.

[0049] In the embodiments of this application, a DC-to-DC converter (DCDC) is also referred to as a DC-DC converter, which is a circuit or electromechanical device used for power conversion. A DCDC can convert direct current (DC) power into DC (or near-DC) power of the same or different voltage. A DCDC can be installed in a battery management system to convert the voltage output from the battery. Figure 2 As shown, a DC-DC converter typically has an input terminal (IN) and an output terminal (OUT). The input terminal (IN) receives DC power from an external source, such as a battery or charging station. The DC-DC converter converts the received DC power, transforming the first input DC voltage into a second DC voltage. The converted DC power is then output through the output terminal (OUT). Both the input terminal (IN) and the output terminal (OUT) can include positive and negative terminals, for example, they can be connected to the positive and negative terminals of a battery, respectively. It should be understood that a DC-DC converter may have one or more input terminals (IN) and one or more output terminals (OUT), and may also have bidirectional conversion functionality, meaning that the input terminals (IN) and output terminals (OUT) are bidirectional interfaces and can be used interchangeably.

[0050] In addition to the input terminal IN and the output terminal OUT, a DC-DC converter typically has a ground terminal GND, which provides a reference ground potential, i.e., a voltage reference for the various voltages in the DC-DC converter. When a DC-DC converter is used in circuit systems such as battery management systems, its ground terminal GND is usually connected to the system's ground or negative power supply.

[0051] like Figure 2 As shown, the DC-DC converter 10 also includes a resistor adjustment circuit 11. The resistor adjustment circuit 11 has a specific resistance value, which can be fixed or adjustable. By connecting the resistor in series, the amplitude of interference signals such as oscillation noise can be suppressed, thereby achieving the function of suppressing interference signals. The resistor adjustment circuit 11 can be connected to the ground terminal GND, which can effectively suppress interference signals in the ground loop, or it can be connected to the output terminal OUT, which can effectively suppress interference signals in the power supply loop. Figures 2 to 6 The example shown illustrates the specific design of the resistance adjustment circuit 11 by taking the connection of the resistance adjustment circuit 11 to the ground terminal GND as an example. The resistance adjustment circuit 11 connected to the output terminal OUT can use a similar design.

[0052] like Figure 2 As shown, the resistance adjustment circuit 11 can be connected in series with the ground loop of the DC-DC converter 10. When the battery management system 1 is applied in a circuit system, Figure 2The GND_EMC of the DC-DC converter 10 illustrated herein can indicate the system's ground potential. For example, when the battery management system 1 is applied in a battery system or electrical device, GND_EMC can indicate the ground potential of the battery system or the electrical device. In some embodiments, an interface can be provided in the DC-DC converter 10 for connecting the ground terminal GND of the DC-DC converter 10 to the ground potential of an external system. A resistor adjustment circuit 11 can be provided between the ground terminal GND and the GND_EMC interface. When the GND_EMC interface is connected to an external system, the resistor adjustment circuit 11 is connected in series between the ground terminal GND of the DC-DC converter 10 and the system ground potential.

[0053] Because a resistor adjustment circuit is connected to the ground terminal and / or output terminal of the DC-DC converter, interference signals introduced by external circuits can be effectively suppressed, reducing the impact of interference signals on the DC-DC converter.

[0054] According to some embodiments of this application, reference is made to Figure 3 and Figure 5 The battery management system 1 also includes a current detection device 111.

[0055] The current detection device 111 is used to detect the current flowing through the resistor adjustment circuit 11.

[0056] The current detection device 111 can be integrated into the resistance adjustment circuit 11, or it can be designed separately from the resistance adjustment circuit 11. Figure 3 and Figure 5 In the example shown, the current detection device 111 is integrated into the resistance adjustment circuit 11.

[0057] like Figure 3 and Figure 5 As shown, the current detection device 111 can be connected in series in the resistor adjustment circuit 11, that is, in series in the ground loop. In this case, the current flowing through the resistor adjustment circuit 11 is also the current in the ground loop. It should be understood that in the embodiment where the resistor adjustment circuit 11 is connected to the output terminal OUT, the current flowing through the resistor adjustment circuit 11 is also the current in the power supply loop.

[0058] In embodiments where the current detection device 111 and the resistance adjustment circuit 11 are designed separately, the current detection device 111 can also be configured to be connected in series with the resistance adjustment circuit 11, so as to detect the current flowing through the resistance adjustment circuit 11.

[0059] By detecting the current flowing through the resistor adjustment circuit, the amplitude of the interference signal in the DC-DC converter can be accurately determined, thereby suppressing the interference signal.

[0060] According to some embodiments of this application, reference is made to Figure 3and Figure 5 The current detection device 111 includes a detection resistor R1 and a current sampling element T1.

[0061] The sensing resistor R1 is connected in series with the resistance adjustment circuit 11.

[0062] The current sampling element T1 is connected to the sensing resistor R1. The current sampling element T1 is used to obtain the current flowing through the sensing resistor R1.

[0063] like Figure 3 and Figure 5 As shown, current sensing can be implemented using a sensing resistor R1 and a current sampling element T1. The sensing resistor R1 can be referred to as the sampling resistor; in one example, a 25 microohm (uΩ) resistor can be used. The current sampling element T1 can be, for example, a current sampling chip. Since the sensing resistor R1 is connected in series in the loop, the current sampling element T1 achieves current sensing by sampling the current flowing through the sensing resistor R1. In some embodiments, the current sampling element T1 can directly sample the current through the sensing resistor R1. In other embodiments, the current sampling element T1 can also sample the voltage across the sensing resistor R1 and calculate the current flowing through the sensing resistor R1 based on its resistance value. For example, the voltage sampling signal across the sensing resistor R1 can be amplified and sent to a control chip (e.g., a microcontroller unit, MCU, etc.) for real-time analysis.

[0064] By setting up a detection resistor and a current sampling element, the current flowing through the resistor adjustment circuit can be obtained, thereby accurately determining the amplitude of the interference signal in the DC-DC converter.

[0065] According to some embodiments of this application, reference is made to Figure 3 and Figure 5 The resistance adjustment circuit 11 includes a resistance circuit 112 and a control circuit U1.

[0066] Resistor circuit 112 is connected in series with ground terminal GND and / or output terminal OUT.

[0067] The control circuit U1 is used to: adjust the resistance value of the current-regulating resistor circuit 112 based on the current-regulating device 111 to suppress interference current.

[0068] As the resistor adjustment circuit 11 is positioned in different locations, such as connected to the ground terminal GND and / or the output terminal OUT, the resistor circuit 112 is connected in series in the ground loop and / or the power supply loop. The resistance value of the resistor circuit 112 can be adjusted.

[0069] Figure 4 and Figure 6The diagram illustrates an example of control circuit U1. For example... Figure 4 and Figure 6 As shown, the control circuit U1 can contain several comparators D2, inverters D3, AND gates D4, etc. The voltage sampling signal across the sensing resistor R1 can be amplified by amplifier D1 and then input to comparator D2. Each comparator D2 can be set with a different reference voltage, i.e. Figure 4 Vref1, Vref2, Vref3, and Vref4 are specified in the diagram. Comparator D2 compares the received amplified voltage sample signal with a reference voltage. When the voltage sample signal is large, comparator D2 will output a high level. Inverter D3 and AND gate D4 can be used to select the level signals output by comparator D2, thereby adjusting the resistance value of resistor circuit 112.

[0070] In some embodiments, the control circuit U1 may also use different types of control chips, such as MCUs, microcontrollers, etc. The control chip can receive the current detected by the current detection device 111 and set the resistance value of the resistor circuit 112 according to the magnitude of the current, for example, by sending a command to the resistor circuit 112 to adjust the resistance value. The specific control method of the control circuit U1 over the resistor circuit 112 will be described in detail below.

[0071] It should be understood that the above embodiments are merely examples of the control circuit U1. In other embodiments, other circuit configurations can also be used to adjust the resistance value of the resistor circuit according to the current. This application does not limit the specific form of the control circuit.

[0072] Since a larger resistance value results in a stronger suppression effect on current, in some embodiments, as the detected current increases, the control circuit U1 can increase the resistance value of the resistor circuit 112, thereby effectively suppressing interference current. When a large surge interference current occurs in the circuit due to lightning strikes, load changes, or switching operations, it can be controlled within the safe range that the DC-DC 10 can withstand, reducing the ground potential fluctuation of the DC-DC 10.

[0073] Adjusting the connected resistor based on the current in the circuit can effectively suppress interference current while reducing its impact on other functions.

[0074] According to some embodiments of this application, reference is made to Figure 3 The resistor circuit 112 includes multiple resistor elements R2 and multiple switching elements K1.

[0075] Multiple resistors R2 are connected in parallel.

[0076] Multiple switching elements K1 correspond one-to-one with multiple resistive elements R2. Each switching element K1 is connected in series with its corresponding resistive element R2.

[0077] like Figure 3 As shown, multiple parallel branches are provided in the resistor circuit 112. Figure 3 The example shown has three branches. It should be understood that other numbers of branches may be provided in other embodiments, and this application does not limit this. Each branch has a resistor R2 and a switch K1. When a switch K1 is turned on, the resistor R2 connected to it is connected in series to the ground loop.

[0078] In some embodiments, each resistive element R2 can be set to be different from each other. Since the resistance value of each resistive element R2 is different, the resistance value of the circuit will change when different switching elements K1 are turned on. In other embodiments, the resistive elements R2 can also form different circuit topologies by controlling the individual switching elements K1. For example, by turning on several switching elements K1, the resistive elements R2 connected to these switching elements K1 can be connected in parallel, thereby changing the resistance value of the circuit. In some embodiments, the resistance value of the resistive element R2 can be selected from the range of 0 ohms (Ω) to 1 kiloohm (kΩ).

[0079] By setting multiple resistive and switching elements, the resistance value of the circuit can be changed by switching the switching elements, thus achieving flexible switching of the resistance value.

[0080] According to some embodiments of this application, adjusting the resistance value of resistor circuit 112 based on the current flowing through resistor adjustment circuit 11 to suppress interference current includes:

[0081] The target resistor element is determined from the multiple resistor elements R2 based on the current obtained from the current detection device 111;

[0082] Turn on the switching element K1, which is connected in series with the target resistor element.

[0083] Based on the current detected by the current detection device 111, the control circuit U1 can select a target resistor element from multiple resistor elements R2. The resistance value of the target resistor element can effectively suppress the current in the circuit without significantly affecting other functions. It should be understood that there can be one or more target resistor elements. When the resistance value of a single resistor element can achieve good suppression, only one target resistor element can be determined, and the switching element K1 connected to the target resistor element can be turned on, thereby connecting the resistor element in series in the circuit. If the resistance value of multiple resistor elements connected in parallel can achieve good suppression, multiple target resistor elements can also be determined, and the switching elements K1 connected to each of these target resistor elements can be turned on, so that these target resistor elements will be connected in parallel and then in series in the circuit.

[0084] Figure 4 The diagram illustrates an example of determining the target resistive element and the switching element. Figure 4 In the example shown, the switching element K1 can be a metal-oxide-semiconductor field-effect transistor (MOSFET). Since the magnitude of the current flowing through the sensing resistor R1 can also be reflected by the magnitude of the voltage across R1, the target resistive element can be connected in the circuit based on the voltage across R1. Figure 4 As shown, the voltage sampling signal across the sensing resistor R1 can be amplified by amplifier D1 and then input into multiple comparators D2. Since each comparator D2 uses a different reference voltage, the comparison results will also be different. The reference voltage used by each comparator D2 is... Figure 4 The values ​​Vref1, VRef2, Vref3, and Vref4 shown in the diagram can be determined based on the resistance values ​​of each resistor R2. By comparing these values ​​with a reference voltage, the target resistor to be connected in the circuit can be identified. When the voltage sampling signal of the sensing resistor R1 is large, comparator D2 will output a high level; when the voltage sampling signal is small, comparator D2 will output a low level. The high and low levels output by comparator D2 will pass through inverter D3 and AND gate D4. The output of AND gate D4 will serve as the control level for switch K1. The high level output of AND gate D4 will drive the corresponding switch K1 to conduct, thus connecting the target resistor to the circuit.

[0085] In some embodiments, the control circuit U1 uses a control chip such as an MCU or a microcontroller. In these embodiments, the control chip can determine the target resistor element with a resistance value that can achieve the suppression function that needs to be connected to the circuit based on the current obtained by the current detection device, and send a control signal to the switching element K1 connected to it to turn it on.

[0086] It should be understood that Figure 4 The circuit shown in the diagram is merely an example. In other embodiments, other methods can be used to implement the function of connecting the target resistive element to the circuit. For example, the current sampling signal flowing through the detection resistor R1 can be used for corresponding control. This application does not limit the specific implementation method.

[0087] Based on the detected current, a target resistor element with a suitable resistance value can be determined from multiple resistor elements. By connecting this target resistor element, effective suppression of interference signals can be achieved.

[0088] According to some embodiments of this application, reference is made to Figure 5 The resistor circuit 112 includes an adjustable resistor element R3.

[0089] like Figure 5 As shown, the resistor circuit 112 can also use an adjustable resistor element R3, such as a sliding rheostat or potentiometer. The adjustable resistor element R3 is connected in series in the circuit, and the control circuit U1 can change the resistance value connected in the circuit by changing its resistance value, thereby achieving a good suppression function for different interference currents.

[0090] Using adjustable resistors allows for flexible resistance adjustment, while also increasing integration and simplifying circuit design.

[0091] According to some embodiments of this application, adjusting the resistance value of resistor circuit 112 based on the current flowing through resistor adjustment circuit 11 to suppress interference current includes:

[0092] The target resistance value is determined based on the current obtained from the current detection device 111;

[0093] Set the resistance value of the adjustable resistor R3 to the target resistance value.

[0094] Based on the current detected by the current detection device 111, the control circuit U1 can determine the target resistance value corresponding to that current. The target resistance value effectively suppresses the current in the circuit without significantly affecting other functions. The control circuit U1 will set the resistance value of the adjustable resistive element R3 to the target resistance value.

[0095] like Figure 5 and Figure 6 As shown, similar to the method described above where the target resistor is connected to the circuit by turning on the switch element K1, the resistance value of the adjustable resistor element R3 can also be adjusted using hardware circuits such as comparator D2, inverter D3, and AND gate D4. Alternatively, a control chip can send control commands to the adjustable resistor element R3 to set its resistance value. This application does not limit the specific method of adjusting the resistance value.

[0096] By setting the resistance value of the adjustable resistor element based on the detected current, the adjustable resistor element can effectively suppress interference signals.

[0097] According to some embodiments of this application, the resistance adjustment circuit 11 includes at least one resistive element.

[0098] In addition to using the resistor adjustment circuit 11 mentioned above, which can adjust the resistance value, a suitable resistance value can also be determined according to the specific application scenario of the DC-DC converter, such as the load condition of the vehicle using the DC-DC converter, by determining the amplitude range of the interference signal in the circuit. In this case, the resistor adjustment circuit 11 can use one or more resistor elements with fixed resistance values, such as resistor elements in the range of 0Ω to 1kΩ.

[0099] Using resistors with fixed resistance values ​​can effectively suppress interference signals in DC-DC converters under specific application scenarios, thereby simplifying circuit design and saving design costs.

[0100] Based on the same technical concept, embodiments of this application provide a battery system. (Reference) Figure 7 The battery system 100 includes the battery management system 1 and the battery 120 in the above embodiments.

[0101] Battery 120 is used to provide electrical energy, including battery output terminal OUT_PACK and battery ground GND_PACK.

[0102] The battery output terminal OUT_PACK is used to output the first DC voltage.

[0103] Battery ground GND_PACK is used to determine the reference ground potential of battery system 100.

[0104] The input terminal IN of the DC-DC converter 10 in the battery management system 1 is connected to the battery output terminal OUT_PACK of the battery 120. The ground terminal GND of the DC-DC converter 10 is connected to the battery ground GND_PACK of the battery 120.

[0105] The embodiment of the battery system 100 can be referred to the embodiment of the DC-DC converter 10, and the repeated parts will not be described again.

[0106] In embodiments of this application, the term "battery" may encompass a single battery cell, or a series, parallel, or interconnected structure of multiple battery cells (e.g., a battery pack or battery module). Figure 7 As shown, the battery output terminal OUT_PACK can include a positive output interface and a negative output interface, which are connected to the positive and negative input interfaces of the DC-DC 10, respectively. The voltage output by the battery 120 serves as the input voltage of the DC-DC 10, which can perform voltage conversion on it. For example, it can convert a higher voltage (e.g., 400 volts or 800 volts) output by the battery 120 to a lower voltage (e.g., 12 volts or 24 volts), which is then output through the output terminal OUT.

[0107] Battery 120 also includes battery ground GND_PACK, which serves as the ground potential for the entire battery system 100, and all voltages in the battery system 100 use this ground potential as a reference potential. In one example, battery ground GND_PACK can be the casing of battery 120 or connected to the casing of battery 120. The ground terminal GND of DC-DC 10 is connected to battery ground GND_PACK, thereby ensuring that DC-DC 10 and the battery have the same reference ground potential.

[0108] Since the resistance adjustment circuit is located inside the DC-DC converter, the number of components connected to the wiring harness in the battery system can be reduced, the size occupied by the battery system can be reduced, and the circuit design of the battery system can be simplified.

[0109] According to some embodiments of this application, the resistor adjustment circuit 11 is connected in series between the ground terminal GND of the DC-DC converter 10 and the battery ground GND_PACK of the battery 120.

[0110] like Figure 7 As shown, GND_EMC is connected to battery ground GND_PACK, which is the ground potential of battery system 100. The resistor adjustment circuit 11 is connected in series between the ground terminal GND of DC-DC 10 and battery ground GND_PACK. When external interference signals (such as lightning strikes, high voltage surges, interference signals introduced from the vehicle end, etc.) enter the ground loop, the resistor adjustment circuit 11 can suppress them.

[0111] By connecting a resistor regulation circuit in series between the battery ground and the ground terminal of the DC-DC converter, interference signals on the ground loop can be effectively suppressed, and ground voltage fluctuations of the DC-DC converter can be reduced.

[0112] According to some embodiments of this application, reference is made to Figure 7The battery system 100 also includes a load device 130.

[0113] The load device 130 is connected to the output terminal OUT of the DC-DC converter.

[0114] like Figure 7 As shown, the output terminal OUT of DC-DC 10 can be connected to the load device 130, and the second DC voltage output by DC-DC 10 can be used to power the load device 130. Figure 7 In the example shown, the load device 130 can be a Smart Battery Management Unit (SBMU) in the battery management system 1. As the reliability of the DC-DC converter 10 improves, the DC-DC converter 10 can continuously power the SBMU, greatly reducing the probability of the SBMU unexpectedly powering down due to power interruption, thereby reducing the risk of power failure. In other embodiments, the load device 130 can also be a load device other than the battery management system 1.

[0115] Batteries and DC-DC converters can provide normal power to load devices and improve the reliability of the power supply process.

[0116] According to some embodiments of this application, the resistance adjustment circuit 11 is connected in series between the output terminal OUT of the DC-DC converter 10 and the load device 130.

[0117] As mentioned above, the resistor adjustment circuit 11 can also be connected in series between the output terminal OUT of the DC-DC converter 10 and the load device 130 to suppress oscillation noise in the power supply circuit. The specific design of the resistor adjustment circuit 11 can be found in the embodiments described above, and will not be repeated here for the sake of brevity.

[0118] By connecting a resistor regulation circuit in series between the load device and the output of the DC-DC converter, interference signals in the power supply circuit can be effectively suppressed, and the stability of the power supply voltage can be improved.

[0119] Based on the same technical concept, embodiments of this application provide an electrical device. The electrical device includes the battery system 100 in the above embodiments.

[0120] Examples of electrical devices can be found in the embodiments of DC-DC converter 10 and battery system 100, and the repetitions will not be repeated.

[0121] A specific embodiment of this application is described below. It should be understood that this specific embodiment is described for illustrative purposes only and should not be construed as limiting the scope of this application.

[0122] like Figure 3As shown, the battery management system 1 includes a DC-DC converter 10, which comprises an input terminal IN, an output terminal OUT, a ground terminal GND, and a resistor adjustment circuit 11. The resistor adjustment circuit 11 is connected in series in the ground loop of the DC-DC converter 10 and includes a resistor circuit 112 and a control circuit U1. The battery management system also includes a current detection device 111. Figure 3 In the example shown, the current detection device 111 is integrated into the resistance adjustment circuit 11.

[0123] The resistor circuit 112 includes multiple parallel branches, each of which is equipped with a resistor element R2 and a switch element K1.

[0124] Based on the current obtained by the current detection device 111, the control circuit U1 can select the target resistor element from multiple resistor elements R2, and turn on the switching element K1 connected to the target resistor element, thereby connecting the target resistor element into the circuit, which effectively suppresses the current in the circuit, while not causing significant impact on other functions.

[0125] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery management system, characterized in that, include: DC-DC converter, including: The input terminal is used to receive the first DC voltage; The output terminal is used to output a second DC voltage based on the first DC voltage after conversion. The grounding terminal is used to provide a reference ground potential; A resistance regulation circuit is used to suppress interference current transmitted from the power consumption device to the DC-DC converter when the battery management system is connected to the power consumption device. The resistance regulation circuit includes: A resistor circuit having an adjustable resistance value; A control circuit is used to adjust the resistance value of the resistor circuit according to the current flowing through the resistor adjustment circuit to suppress the interference current, wherein, The resistive circuit includes multiple resistive elements and multiple switching elements. The resistive elements are connected in parallel, and the multiple switching elements correspond one-to-one with the resistive elements and are connected in series with their respective resistive elements; or The resistor circuit includes an adjustable resistor element, the resistance value of which is set by the control circuit according to the current flowing through the resistor adjustment circuit.

2. The battery management system according to claim 1, characterized in that, The battery management system also includes: A current detection device is used to detect the current flowing through the resistor adjustment circuit.

3. The battery management system according to claim 2, characterized in that, The current detection device includes: The detection resistor is connected in series with the resistance adjustment circuit. A current sampling element is connected to the detection resistor, and the current sampling element is used to acquire the current flowing through the detection resistor.

4. The battery management system according to claim 1, characterized in that, The resistor circuit is connected in series with the ground terminal and / or the output terminal.

5. The battery management system according to claim 2, characterized in that, The step of adjusting the resistance value of the resistor circuit according to the current flowing through the resistor adjustment circuit to suppress the interference current includes: The target resistance element is determined from the plurality of resistance elements based on the current obtained from the current detection device; Turn on the switching element that is connected in series with the target resistor element.

6. The battery management system according to claim 2, characterized in that, The step of adjusting the resistance value of the resistor circuit according to the current flowing through the resistor adjustment circuit to suppress the interference current includes: The target resistance value is determined based on the current obtained from the current detection device; Set the resistance value of the adjustable resistive element to the target resistance value.

7. A battery system, characterized in that, include: Battery management system as described in any one of claims 1-6; A battery for providing electrical energy, the battery comprising: The battery output terminal is used to output the first DC voltage; Battery ground is used to determine the reference ground potential of the battery system, wherein, The input terminal of the DC-DC converter in the battery management system is connected to the battery output terminal of the battery, and the ground terminal of the DC-DC converter is connected to the battery ground.

8. The battery system according to claim 7, characterized in that, The resistor adjustment circuit is connected in series between the ground terminal of the DC-DC converter and the battery ground of the battery.

9. The battery system according to claim 7 or 8, characterized in that, The battery system also includes: A load device is connected to the output terminal of the DC-DC converter.

10. The battery system according to claim 9, characterized in that, The resistor adjustment circuit is connected in series between the output terminal of the DC-DC converter and the load device.

11. An electrical appliance, characterized in that, Includes the battery system as described in any one of claims 7-10.

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