Battery management system, battery system and electric device

Abstract

The utility model discloses a battery management system, a battery system and an electric device. The battery management system comprises a current source module which is connected with the first driving end of the fuse and is used for providing current; the sampling module is connected with the first driving end and the second driving end of the fuse, and is used for collecting the voltage of the first driving end and the voltage of the second driving end; the voltage dividing module is connected with the second driving end and the grounding end and comprises a voltage dividing node; the processor is connected with the sampling module and a voltage dividing node of the voltage dividing module, and is used for determining a resistance value between the first driving end and the second driving end according to the voltage collected by the sampling module and the current provided by the current source module, and is used for determining the resistance value between the first driving end and the second driving end according to the resistance value, the voltage collected by the sampling module and the voltage of the voltage dividing node; and determining whether the fuse has a fault or not. According to the embodiment of the invention, whether the fuse has a fault can be detected.

Description

Technical Field

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

[0002] With the popularity of electric vehicles, the high-voltage safety of electric vehicles has received more and more attention. Among them, fuses, as indispensable devices in the entire vehicle circuit, play a key role in circuit protection. Therefore, the reliability of their work is directly related to the safety of the entire vehicle.

[0003] If a fuse fails, when a vehicle collides or a high-voltage circuit short-circuits, the fuse cannot be blown normally, resulting in a safety risk. Therefore, it is particularly important to study the fault detection function of the fuse. Utility Model Content

[0004] The present application provides a battery management system, a battery system and an electrical device, which can detect whether a fuse is faulty.

[0005] In a first aspect, the present application provides a battery management system, comprising: a current source module, connected to a first driving end of a fuse, for providing current; a sampling module, connected to the first driving end and the second driving end of the fuse, for collecting voltages at the first driving end and the second driving end; a voltage divider module, connected to the second driving end and the ground end, comprising a voltage divider node; a processor, connected to the sampling module and the voltage divider node of the voltage divider module, for determining a resistance value between the first driving end and the second driving end based on a voltage collected by the sampling module and a current provided by the current source module, and for determining whether the fuse is faulty based on a voltage collected by the resistance value sampling module and a voltage at the voltage divider node.

[0006] According to the battery management system provided in the embodiment of the present application, a current source module, a sampling module, a voltage divider module and a processor are provided, which can not only detect the resistance value of the equivalent resistor in the fuse, but also detect whether there is a fault at the driving end of the fuse, thereby achieving a more comprehensive detection of the fuse, thereby avoiding the situation where the fuse cannot be blown normally when it is needed due to a fault at the driving end of the fuse or a large deviation in the resistance value of the fuse.

[0007] In a possible implementation of the first aspect, the sampling module is used to collect the voltage drop between the first driving end and the second driving end. The voltage input to the processor by the sampling module can directly represent the voltage drop between the first driving end and the second driving end, so that the processor does not need to calculate the voltage drop between the first driving end and the second driving end, thereby improving detection efficiency and determining the real-time status of the fuse more timely.

[0008] In a possible implementation of the first aspect, the sampling module includes a first resistor, a second resistor, a third resistor, a fourth resistor, and an operational amplifier;

[0009] The first resistor is connected between the first driving terminal and the first input terminal of the operational amplifier;

[0010] The second resistor is connected between the first input terminal of the operational amplifier and the ground terminal;

[0011] The third resistor is connected between the second driving terminal and the second input terminal of the operational amplifier;

[0012] The fourth resistor is connected between the second input terminal of the operational amplifier and the output terminal of the operational amplifier;

[0013] The output terminal of the operational amplifier is connected to the processor.

[0014] In the embodiment of the present application, a sampling module with a differential amplifier structure can amplify and compare the voltages of the first driving end and the second driving end. Even if the voltage drop between the first driving end and the second driving end is relatively small, accurate data collection can be performed, thereby ensuring that the resistance value of the equivalent resistance between the first driving end and the second driving end is accurately detected.

[0015] In a possible implementation of the first aspect, the voltage divider module includes a fifth resistor and a sixth resistor, the first end of the fifth resistor is connected to the second driving end, the second end of the fifth resistor and the first end of the sixth resistor are connected to the voltage divider node, the second end of the sixth resistor is connected to the ground end, and the voltage divider node is connected to the processor.

[0016] The fifth resistor and the sixth resistor are connected in series and then divided. When the voltage connected to the first driving end or the second driving end is different, the voltage of the voltage dividing node will also change. Therefore, the state of the first driving end and the second driving end can be detected by collecting the voltage of the voltage dividing node of the fifth resistor and the sixth resistor.

[0017] In a possible implementation of the first aspect, the circuit further includes a seventh resistor, which is connected in parallel to the voltage divider module.

[0018] In the embodiment of the present application, by setting the seventh resistor in parallel with the voltage divider module, the voltage of the voltage divider node of the voltage divider module can be reduced, so that the voltage of the voltage divider node can fall within the collection range of the voltage collection module connected to the voltage divider node, thereby ensuring that the voltage of the voltage divider node can be accurately collected.

[0019] In a possible implementation of the first aspect, the current source module is used to provide a constant current. When the current source module provides a constant current, the constant current value may be stored in the processor in advance so that the processor can directly use it when calculating the resistance value of the equivalent resistance of the fuse. Furthermore, when the current source module provides a constant current, a current detector may not be required, and the current source module and the processor may not need to be connected.

[0020] In a possible implementation of the first aspect, the circuit further includes a diode connected between the current source module and the first driving end. The diode has an anti-reverse function, which can prevent a large current from flowing back into the current source module, thereby improving current reliability.

[0021] In a possible implementation of the first aspect, the voltage of the voltage division node is V12, and the processor is configured to:

[0022] If V12 is equal to the divided voltage of the sixth resistor in the series circuit of the fifth resistor and the sixth resistor, it is determined that at least one of the first driving end and the second driving end has a short power fault, where U represents the voltage value of the power supply short-circuited by the driving end of the fuse.

[0023] Since the resistance values ​​of the fifth resistor and the sixth resistor are much larger than the resistance value of the equivalent resistor, the voltage division of the equivalent resistor can be ignored. Therefore, no matter whether the power supply is short-circuited at the first driving end or the power supply is short-circuited at the second driving end, it can be considered that the first end of the fifth resistor is connected to the short-circuited power supply. Therefore, the voltage V12 of the voltage division node is the voltage division of the short-circuited power supply by the sixth resistor. According to the above formula, it can be determined whether there is a short power fault in at least one of the first driving end and the second driving end.

[0024] In a possible implementation of the first aspect, the sampling module is used to collect a voltage drop between the first driving end and the second driving end, the voltage drop is V11, the voltage of the voltage dividing node is V12, and the processor is used to:

[0025] If V11=0, and V12=0, it is determined that there is a short-to-ground fault at the first drive end;

[0026] If V11≠0, and V12=0, it is determined that a short-to-ground fault exists at the second driving end.

[0027] If there is a short-to-ground fault at the first driving end, the current provided by the current source module will not flow through the equivalent resistor, the fifth resistor and the sixth resistor, so the voltage at the first driving end is equal to 0, and the voltage at the second driving end is also equal to 0. Therefore, V11≠0, and V12=0, it can be determined that there is a short-to-ground fault at the first driving end.

[0028] If there is no short-to-ground fault at the first driving end, but there is a short-to-ground fault at the second driving end, the current provided by the current source module will flow through the equivalent resistor, but the current will not flow through the fifth resistor and the sixth resistor. Therefore, the sampling module can collect the voltage, and the voltage at the second driving end is 0. Therefore, if V11≠0, and V12=0, it is determined that there is a short-to-ground fault at the second driving end, and there is no short-to-ground fault at the first driving end.

[0029] In a possible implementation of the first aspect, the sampling module is used to collect a voltage drop between the first driving end and the second driving end, the voltage drop is V11, the voltage of the voltage dividing node is V12, and the processor is used to:

[0030] If the voltage value of V11 after being sampled by the processor is the full amplitude value that the processor can collect, and V12=0, it is determined that there is an open circuit fault between the first driving end and the second driving end.

[0031] If there is an open circuit fault between the first driving end and the second driving end, the voltage on the first driving end is roughly equal to the voltage of the current source module, and there is no voltage on the second driving end. Therefore, the voltage output by the sampling module to the processor at this time reaches the maximum voltage that the processor can collect, and there is no voltage on the voltage dividing node. Therefore, if V11 is equal to the maximum voltage that the sampling module can collect, and V12=0, it can be determined that there is an open circuit fault between the first driving end and the second driving end.

[0032] Based on the same inventive concept, in a second aspect, an embodiment of the present application provides a battery system, including a battery management system as described in any embodiment of the first aspect.

[0033] Based on the same inventive concept, in a third aspect, an embodiment of the present application provides an electrical device, comprising a battery system as described in any embodiment of the first aspect.

[0034] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0036] Figure 1 This is a schematic diagram of the structure of a battery management system according to an embodiment of the present application;

[0037] Figure 2 This is a schematic diagram of the structure of another battery management system according to an embodiment of the present application;

[0038] Figure 3 A schematic diagram of the structure of a battery management system according to an embodiment of the present application;

[0039] Figure 4 A schematic diagram of the structure of a battery management system according to an embodiment of the present application;

[0040] Figure 5 The present invention provides a schematic structural diagram of a battery management system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0043] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] The embodiments of the present application provide a battery management system, a battery system and an electrical device. The embodiments of the present application are described below in conjunction with the accompanying drawings.

[0045] like Figure 1As shown, the battery management system provided in the embodiment of the present application can detect the fuse 20. The driving end of the fuse 20 includes a first driving end 21 and a second driving end 22, and the resistance between the first driving end 21 and the second driving end 22 is recorded as an equivalent resistance R0. Here, the equivalent resistance R0 is the internal resistance value of the fuse to be calculated. In the actual product form, it does not mean that there is a resistor connected between the two driving ends of the fuse.

[0046] The battery management system includes a current source module 11 , a sampling module 12 , a voltage division module 13 and a processor 14 .

[0047] The current source module 11 is connected to the first driving end 21 and is used to provide current to the first driving end 21 .

[0048] The sampling module 12 is connected to the first driving end 21 and the second driving end 22 , and is used for collecting voltages of the first driving end 21 and the second driving end 22 .

[0049] The voltage dividing module 13 is connected to the second driving end 22 and the ground end GND, and the voltage dividing module 13 includes a voltage dividing node IN2 .

[0050] The processor 14 is connected to the sampling module 12 and the voltage dividing node IN2 of the voltage dividing module 13, and is used to determine the resistance value of the equivalent resistor R0 between the first driving end 21 and the second driving end 22 according to the voltage collected by the sampling module 12 and the current provided by the current source module 11, and is used to determine whether the fuse 20 is faulty according to the resistance value and the voltage collected by the sampling module 12 and the voltage of the voltage dividing node IN2.

[0051] For example, when a vehicle collides or a high-voltage circuit short-circuits, a voltage signal can be applied to the first drive end 21 and the second drive end 22, so that a certain current will be generated between the first drive end 21 and the second drive end 22. If the generated current exceeds a specified value, an explosive shock can be triggered to cut off the circuit and achieve a protective function.

[0052] Exemplarily, the first driving end 21 can be connected to the voltage source V1 through the first switch K1, and the second driving end 22 can be connected to the ground terminal GND through the second switch K2. When the fuse needs to be blown, the first switch K1 and the second switch K2 can be controlled to be closed, the voltage source V1 and the ground terminal GND are connected, and a current exceeding a specified value is generated between the first driving end 21 and the second driving end 22 to blow the fuse.

[0053] Exemplarily, the voltage source V1 is a constant voltage, for example, the voltage of the voltage source V1 is a voltage of about 12V. The fuse blows when driven by a current of 3A to 4A. For example, in the industry standard, the fuse blows at 1.75A@0.5ms. Under normal circumstances, the resistance value of the equivalent resistor R0 of the fuse is relatively small, for example, the resistance value of the equivalent resistor R0 is about 2Ω. If the resistance value of the equivalent resistor R0 is too large, the normal blowing of the fuse cannot be achieved. Therefore, it is very important to detect the resistance value of the equivalent resistor in the fuse.

[0054] The current source module 11 is connected to the first driving end 21, and the second driving end 22 is connected to the ground terminal GND through the voltage divider module 13, so the current provided by the current source module 11 can flow from the first driving end 21 to the second driving end 22. When the current flows through the first driving end 21 and the second driving end 22, and there is a certain resistance between the first driving end 21 and the second driving end 22, a certain voltage drop will be generated between the first driving end 21 and the second driving end 22. The sampling module 12 can collect the voltage of the first driving end 21 and the second driving end 22. In this way, the processor 14 can calculate the resistance value of the equivalent resistance R0 between the first driving end 21 and the second driving end 22 according to the voltage of the first driving end 21 and the second driving end 22 and the current flowing through the first driving end 21 and the second driving end 22, so that the resistance value of the equivalent resistance of the fuse can be detected. By obtaining the resistance value of the equivalent resistance of the fuse, it can be determined whether the resistance value of the equivalent resistance of the fuse is within a reasonable range. If it is not within a reasonable range, a fault can be reported and an early warning signal can be issued to remind the user to check in time to avoid serious damage to the fuse in the circuit, causing damage to the circuit and endangering driving safety.

[0055] It is understandable that the current provided by the current source module 11 is less than the specified current value, where the specified current value refers to the current value that can explode the fuse.

[0056] As described above, the fuse can be blown by applying a voltage signal to the first drive end 21 and the second drive end 22. However, if the first drive end 21 and the second drive end 22 have a short power supply, a short ground or an open circuit fault, the fuse cannot be blown normally. Therefore, it is also very important to detect the state of the drive end of the fuse.

[0057] The sampling module 12 can collect the voltage of the first driving end 21 and the second driving end 22, and the voltage of the voltage dividing node IN2 of the voltage dividing module 13 is related to the voltage of the second driving end 22. Therefore, the processor 14 can determine whether there is a short power supply, a short ground or an open circuit fault at the first driving end 21 and the second driving end 22 according to the voltage collected by the sampling module 12 and the voltage of the voltage dividing node IN2. If there is a short power supply, a short ground or an open circuit fault, the fault can be reported and an early warning signal can be issued to remind the user to check in time to avoid circuit damage and endanger driving safety.

[0058] It should be noted that in the embodiment of the present application, it is not necessary to close any switch connected to the driving end during the detection process. For example, during the detection process, neither the first switch K1 nor the second switch K2 needs to be closed.

[0059] According to the battery management system provided in the embodiment of the present application, a current source module, a sampling module, a voltage divider module and a processor are provided, which can not only detect the resistance value of the equivalent resistor in the fuse, but also detect whether there is a fault at the driving end of the fuse, thereby achieving a more comprehensive detection of the fuse, thereby avoiding the situation where the fuse cannot be blown normally when it is needed due to a fault at the driving end of the fuse or a large deviation in the resistance value of the fuse.

[0060] In some embodiments, the sampling module 12 can be directly used to collect the voltage drop between the first driving end 21 and the second driving end 22. In other words, the voltage input from the sampling module 12 to the processor 14 can directly represent the voltage drop between the first driving end 21 and the second driving end 22, so that the processor 14 does not need to calculate the voltage drop between the first driving end 21 and the second driving end 22, thereby improving detection efficiency and determining the real-time status of the fuse in a more timely manner.

[0061] Of course, in other examples, the sampling module 12 may also collect the voltage value of the first driving end and the voltage value of the second driving end respectively, and feed the collected two voltage values ​​back to the processor 14, and the processor 14 calculates the voltage drop between the first driving end and the second driving end according to the two voltage values.

[0062] Exemplarily, the sampling module 12 may adopt any circuit structure as long as the voltage value can be detected.

[0063] As an example, Figure 2 As shown, the sampling module 12 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and an operational amplifier C.

[0064] The first resistor R1 is connected between the first driving end 21 and the first input end of the operational amplifier C; the second resistor R2 is connected between the first input end of the operational amplifier C and the ground end GND; the third resistor R3 is connected between the second driving end 22 and the second input end of the operational amplifier C; the fourth resistor R4 is connected between the second input end of the operational amplifier C and the output end of the operational amplifier C; the output end of the operational amplifier C is connected to the processor 14.

[0065] The first resistor R1 , the second resistor R2 , the third resistor R3 , the fourth resistor R4 and the operational amplifier C constitute a differential amplifier.

[0066] For example, the output end of the operational amplifier C is connected to the processor 14 at the first sampling point IN1. The processor 14 can calculate the resistance value between the first driving end 21 and the second driving end 22 based on the voltage at the first sampling point IN1 and the resistance values ​​of the third resistor R3 and the fourth resistor R4. Specifically, the resistance values ​​of the first driving end 21 and the second driving end 22 can be calculated based on the following relationship (1):

[0067] R5=(V IN1 *R3) / (R4*I) (1);

[0068] Among them, V IN1 represents the voltage of the first sampling point IN1 , and I represents the current provided by the current source module 11 .

[0069] Under normal circumstances, the resistance value of the equivalent resistor R0 between the first driving end 21 and the second driving end 22 is about 2Ω. The current provided by the current source module 11 is less than the specified current value. For example, the current provided by the current source module 11 is about 10mA. Under normal circumstances, the voltage drop between the first driving end 21 and the second driving end 22 is relatively small.

[0070] In the embodiment of the present application, a sampling module with a differential amplifier structure can amplify and compare the voltages of the first driving end and the second driving end. Even if the voltage drop between the first driving end and the second driving end is relatively small, accurate data collection can be performed, thereby ensuring that the resistance value of the equivalent resistance between the first driving end and the second driving end is accurately detected.

[0071] Of course, the structure of the sampling module described in the above example is only an example. In other embodiments, the sampling module may also adopt circuits of other structures as long as the voltage drop across the equivalent resistor can be sampled.

[0072] In some embodiments, Figure 3As shown, the voltage divider module 13 includes a fifth resistor R5 and a sixth resistor R6, the first end of the fifth resistor R5 is connected to the second driving end 22, the second end of the fifth resistor R5 and the first end of the sixth resistor R6 are connected to the voltage divider node IN2, the second end of the sixth resistor R is connected to the ground end GND, and the voltage divider node IN2 is connected to the processor 14.

[0073] The fifth resistor R5 and the sixth resistor R6 are connected in series and then divided. When the voltage of the first driving end or the second driving end is different, the voltage of the voltage dividing node IN2 will also change. Therefore, the state of the first driving end and the second driving end can be detected by collecting the voltage of the voltage dividing node IN2 of the fifth resistor R5 and the sixth resistor R6. In addition, in the embodiment of the present application, the processor combines the voltage of the first sampling point IN1 and the voltage of the voltage dividing node IN2 to detect whether the first driving end and the second driving end are faulty. Compared with only relying on the voltage of the voltage dividing node IN2 to detect whether the first driving end and the second driving end are faulty, higher detection accuracy can be achieved.

[0074] Exemplarily, the resistance value of the fifth resistor R5 and the sixth resistor R6 may be much greater than the resistance value of the equivalent resistor R0 between the first drive end and the second drive end. Under normal circumstances, the resistance value of the equivalent resistor R0 is several ohms. The resistance value of the fifth resistor R5 and the sixth resistor R6 may be in the order of kiloohms. For example, the resistance value of the fifth resistor R5 is about 100KΩ, and the resistance value of the sixth resistor R6 is about 33KΩ. For example, in the case of a short power supply at the first drive end and / or the second drive end, the short-circuited power supply is certain, for example, the short-circuited power supply is 9V~16V. According to the power formula P=U 2 / R shows that U in the formula can represent a short-circuited power supply. The larger the resistance value, the smaller the power. Setting the resistance values ​​of the fifth resistor R5 and the sixth resistor R6 to be larger can reduce the power, thereby avoiding the fifth resistor R5 and the sixth resistor R6 from being damaged due to excessive heat when a short power supply appears at the first driving end and / or the second driving end, thereby improving the reliability of the overall circuit.

[0075] In some embodiments, Figure 4 As shown, the detection circuit further includes a seventh resistor R7 , and the seventh resistor R7 is connected in parallel with the voltage dividing module 13 .

[0076] As described above, the voltage divider module 13 includes a fifth resistor R5 and a sixth resistor R6 connected in series. During the detection process, for example, if there is no open circuit fault between the first driving end 21 and the second driving end 22, the current value provided by the current source module 11 reaches the ground terminal GND through the equivalent resistor R0, the fifth resistor R5 and the sixth resistor R6 in sequence. When the resistance values ​​of the fifth resistor R5 and the sixth resistor R6 are much greater than the resistance value of the equivalent resistor R0, the voltage of the voltage divider node IN2 will be relatively large. For example, the voltage divider node IN2 is connected to a voltage acquisition module (not shown in the figure), and the voltage acquisition range of the voltage acquisition module is certain. When the voltage of the voltage divider node IN2 is large, it will exceed the acquisition range of the voltage acquisition module, resulting in the inability to acquire the voltage of the voltage divider node IN2. Exemplarily, the processor 14 may include a voltage acquisition module, or the voltage acquisition module may be arranged outside the processor 14. Exemplarily, the voltage acquisition module includes an analog-to-digital conversion module (ADC).

[0077] As an example, the acquisition range of the voltage acquisition module is 0~3.3V, or 0~5V, the constant current provided by the current source module 11 is approximately 10mA, the fifth resistor R5 is approximately 100KΩ, the sixth resistor R6 is approximately 33KΩ, and the seventh resistor R7 can be approximately 200Ω.

[0078] Exemplarily, a resistor with a resistance value of approximately 200Ω may be set as the seventh resistor R7, or five resistors with a resistance value of 1KΩ may be set in parallel as the seventh resistor R7.

[0079] In the embodiment of the present application, by setting the seventh resistor in parallel with the voltage divider module, the voltage of the voltage divider node of the voltage divider module can be reduced, so that the voltage of the voltage divider node can fall within the collection range of the voltage collection module connected to the voltage divider node, thereby ensuring that the voltage of the voltage divider node can be accurately collected.

[0080] In some embodiments, the current source module 11 is used to provide a constant current. For example, the constant current is less than the current specified value. For example, the current source module 11 is used to provide a constant current of about 10 mA. In the case where the current source module 11 provides a constant current, the constant current value can be stored in the processor 14 in advance so that the processor can directly use it when calculating the resistance value of the fuse equivalent resistance. In addition, in the case where the current source module 11 provides a constant current, it is not necessary to set a current detector, and the current source module 11 and the processor 14 do not need to be connected.

[0081] In some embodiments, Figure 5As shown, the detection circuit also includes a diode D1, which is connected between the current source module 11 and the first driving end 21. Specifically, the positive electrode of the diode D1 is connected to the current source module 11, and the negative electrode of the diode D1 is connected to the first driving end 21. The diode has an anti-reverse function, which can prevent large current from flowing back to the current source module, thereby improving current reliability.

[0082] The following describes how to determine whether there is a short power fault, a short ground fault, or an open circuit fault at the first drive end or the second drive end.

[0083] In some embodiments, please refer to Figure 5 For example, the voltage of the voltage-dividing node IN2 is V12, and the processor 14 is used to: if V12 is equal to the voltage U divided by the sixth resistor in the series circuit of the fifth resistor and the sixth resistor, it is determined that at least one of the first driving end 21 and the second driving end 22 has a short power fault, wherein U represents the voltage value of the power supply short-circuited by the driving end of the fuse.

[0084] Since the resistance values ​​of the fifth resistor R5 and the sixth resistor R6 are much larger than the resistance value of the equivalent resistor R0 between the first driving end and the second driving end, the voltage division of the equivalent resistor R0 can be ignored. Therefore, no matter whether the first driving end 21 or the second driving end 22 is short-circuited with the power supply, it can be considered that the first end of the fifth resistor R5 is connected to the short-circuited power supply. Therefore, the voltage V12 of the voltage division node IN2 is the voltage division of the short-circuited power supply by the sixth resistor R6. Therefore, according to the above formula, it can be determined whether there is a short power fault in at least one of the first driving end and the second driving end.

[0085] Under normal circumstances, the normal voltage range of the external power supply is 9V~16V, so the voltage range of the power supply short-circuited by the first driving terminal 21 and the second driving terminal 22 is 9V~16V. The voltage value of the external power supply may fluctuate. For example, in some cases, the voltage range of the external power supply may fluctuate to 6V~18V. Therefore, the size of U can be set according to the normal voltage range of the external power supply and with a certain redundancy.

[0086] It is understandable that, without considering the voltage division of the equivalent resistance R0, the processor can be used to: if U1*R6 / (R5+R6)≤V12≤U2*R6 / (R5+R6), it is determined that at least one of the first drive end 21 and the second drive end 22 has a short power fault, wherein U1 represents the minimum value of the power short-circuited by the control end of the fuse, and U2 represents the maximum value of the power short-circuited by the control end of the fuse.

[0087] As mentioned above, the voltage value of the external power supply may fluctuate. For example, in some cases, the voltage range of the external power supply may fluctuate to 6V~18V. Therefore, the size of U1 and U2 can be set according to the normal voltage range of the external power supply and with a certain redundancy. For example, U1 is smaller than the minimum value of the normal voltage range of the external power supply, and U2 is larger than the maximum value of the normal voltage range of the external power supply.

[0088] Without considering the voltage division of the equivalent resistor R0, the processor can also be used to: if the voltage V12 of the voltage division node meets U1*R6 / (R5+R6)≤V12≤U2*R6 / (R5+R6), it can be considered that at least one of the first drive end 21 and the second drive end 22 has a short power fault; if the voltage V12 of the voltage division node does not meet U1*R6 / (R5+R6)≤V12≤U2*R6 / (R5+R6), it can be considered that the first drive end 21 and the second drive end 22 do not have a short power fault.

[0089] In some embodiments, please refer to Figure 5 For example, the voltage of the voltage-dividing node IN2 is V12, the sampling module 12 is used to collect the voltage drop between the first driving end 21 and the second driving end 22, the voltage drop collected by the sampling module 12 is V11, that is, the voltage of the first sampling point IN1 is V11, and the processor 14 is used to: if V11=0, and V12=0, then determine that there is a short-to-ground fault in the first driving end 21; if V11≠0, and V12=0, then determine that there is a short-to-ground fault in the second driving end 22.

[0090] If there is a short-to-ground fault at the first driving end 21, the current provided by the current source module 11 will not flow through the equivalent resistor R0, the fifth resistor R5 and the sixth resistor R6, so the voltage at the first driving end 21 is equal to 0, and the voltage at the second driving end 22 is also equal to 0. Therefore, V11≠0, and V12=0, it can be determined that there is a short-to-ground fault at the first driving end.

[0091] If there is no short-to-ground fault at the first driving end 21, and there is a short-to-ground fault at the second driving end 22, the current provided by the current source module 11 will flow through the equivalent resistor R0, but the current will not flow through the fifth resistor R5 and the sixth resistor R6. Therefore, the sampling module 12 can collect the voltage, and the voltage at the second driving end is 0. Therefore, if V11≠0, and V12=0, it is determined that there is a short-to-ground fault at the second driving end 22, and there is no short-to-ground fault at the first driving end.

[0092] In some embodiments, please refer to Figure 5For example, the voltage of the voltage-dividing node IN2 is V12, the sampling module 12 is used to collect the voltage drop between the first driving end 21 and the second driving end 22, and the voltage drop collected by the sampling module 12 is V11, that is, the voltage of the first sampling point IN1 is V11, and the processor 14 is used to: if the voltage value of V11 after being sampled by the processor is the full amplitude value that the processor can collect, and V12=0, then it is determined that there is an open circuit fault between the first driving end 21 and the second driving end 22.

[0093] If there is an open circuit fault between the first driving end 21 and the second driving end 22, the voltage on the first driving end 21 is substantially equal to the voltage of the current source module 11, and there is no voltage on the second driving end 22. Therefore, the voltage input to the processor by the sampling module 12 at this time reaches the maximum voltage that the voltage sampling module in the processor can collect, and there is no voltage on the voltage dividing node IN2. Therefore, if V11 is equal to the maximum voltage that the sampling module 12 can collect, and V12=0, it can be determined that there is an open circuit fault between the first driving end 21 and the second driving end 22.

[0094] It should be noted that, in the process of detecting the resistance value of the fuse and detecting the states of the first driving end and the second driving end, the first switch K1 and the second switch K2 do not need to be actuated, that is, the first switch K1 and the second switch K2 are both disconnected.

[0095] Exemplarily, the processor 14 may be a chip or circuit that performs related actions according to characteristic instructions. For example, the processor 14 may be a microcontroller unit (MCU), a digital signal controller (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. For another example, the processor 14 may include an external clock, a random access memory (RAM), a read-only memory (ROM), etc. The present application does not limit the specific structure of the processor 14.

[0096] Based on the same inventive concept, the embodiment of the present application also provides a battery system, including the battery management system in any of the above embodiments. It can be understood that the battery system has the beneficial effects of the battery management system provided in the embodiment of the present application, and the specific description of the battery management system in the above embodiments can be referred to, and this embodiment will not be repeated here.

[0097] Based on the same inventive concept, the present application also provides an electric device. The electric device includes a battery system, and the battery system includes the battery management system in any of the above embodiments. It can be understood that the electric device has the beneficial effects of the battery management system provided in the embodiments of the present application. For details, please refer to the specific description of the battery management system in the above embodiments, which will not be repeated in this embodiment.

[0098] It should be noted that, in the above embodiments, the resistor is represented by a single resistor. In other embodiments, the resistor may also be an integration of series, parallel or hybrid resistors. In addition, in the above embodiments, the capacitor is represented by a single capacitor. In other embodiments, the capacitor may also be an integration of series, parallel or hybrid capacitors. The specific parameters of each device may be set according to actual needs, and this application does not limit this.

[0099] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0100] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present 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: A current source module, connected to the first driving end of the fuse, and used for providing current; A sampling module, connected to the first driving end and the second driving end of the fuse, and used for collecting voltages of the first driving end and the second driving end; A voltage dividing module, connected to the second driving end and the ground end, including a voltage dividing node; A processor is connected to the sampling module and the voltage dividing node of the voltage dividing module, and is used to determine the resistance value between the first driving end and the second driving end according to the voltage collected by the sampling module and the current provided by the current source module, and is used to determine whether the fuse is faulty according to the resistance value, the voltage collected by the sampling module, and the voltage of the voltage dividing node.

2. The battery management system according to claim 1, characterized in that: The sampling module is used to collect the voltage drop between the first driving end and the second driving end.

3. The battery management system according to claim 2, characterized in that: The sampling module includes a first resistor, a second resistor, a third resistor, a fourth resistor and an operational amplifier; The first resistor is connected between the first driving end and the first input end of the operational amplifier; The second resistor is connected between the first input terminal of the operational amplifier and the ground terminal; The third resistor is connected between the second driving end and the second input end of the operational amplifier; The fourth resistor is connected between the second input terminal of the operational amplifier and the output terminal of the operational amplifier; The output terminal of the operational amplifier is connected to the processor.

4. The battery management system according to any one of claims 1 to 3, characterized in that: The voltage divider module includes a fifth resistor and a sixth resistor, the first end of the fifth resistor is connected to the second driving end, the second end of the fifth resistor and the first end of the sixth resistor are connected to the voltage divider node, the second end of the sixth resistor is connected to the ground end, and the voltage divider node is connected to the processor.

5. The battery management system according to any one of claims 1 to 3, characterized in that: The battery management system further includes a seventh resistor, and the seventh resistor is connected in parallel with the voltage dividing module.

6. The battery management system according to any one of claims 1 to 3, characterized in that: The current source module is used to provide a constant current.

7. The battery management system according to any one of claims 1 to 3, characterized in that: The battery management system further includes a diode connected between the current source module and the first driving end.

8. The battery management system according to claim 4, characterized in that: The voltage of the voltage-dividing node is V12, and the processor is used for: If V12 is equal to the divided voltage U of the sixth resistor in the series circuit of the fifth resistor and the sixth resistor, it is determined that at least one of the first driving end and the second driving end has a short power fault, where U represents the voltage value of the power supply short-circuited by the driving end of the fuse.

9. The battery management system according to claim 4, characterized in that: The sampling module is used to collect the voltage drop between the first driving end and the second driving end, the voltage drop is V11, the voltage of the voltage dividing node is V12, and the processor is used to: If V11=0, and V12=0, it is determined that there is a short-to-ground fault at the first driving end; If V11≠0, and V12=0, it is determined that a short-to-ground fault exists at the second driving end.

10. The battery management system according to claim 4, characterized in that: The sampling module is used to collect the voltage drop between the first driving end and the second driving end, the voltage drop is V11, the voltage of the voltage dividing node is V12, and the processor is used to: If the voltage value of V11 after being sampled by the processor is the full amplitude value that can be sampled by the processor, and V12=0, it is determined that there is an open circuit fault between the first driving end and the second driving end.

11. A battery system, characterized in that: The invention comprises a battery management system as claimed in any one of claims 1 to 10.

12. An electrical device, characterized in that: Comprising the battery system as claimed in claim 11.

Images