Battery management system, battery pack and electric device

Abstract

The utility model discloses a battery management system, a battery pack and an electric device. The battery management system comprises a sampling resistor which is connected in series with a battery pack; the analog front-end chip is electrically connected with the sampling resistor and is used for monitoring a first current value of the battery pack according to the voltage drop at the two ends of the sampling resistor and outputting a first overcurrent signal under the condition that the first current value is greater than a first current threshold value; the isolation module is electrically connected with the analog front-end chip and is used for receiving the first overcurrent signal and outputting a second overcurrent signal; the processor is electrically connected with the isolation module and is used for receiving the second overcurrent signal and outputting an enable signal; and the driving chip is electrically connected with the processor and the protector and is used for disconnecting the protector according to the enable signal. According to the embodiment of the invention, damage caused by overcurrent can be prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery management, in particular to a battery management system, a battery pack and a power utilization device. BACKGROUND

[0002] During the use of the battery pack, short circuit may occur due to the aging or mechanical damage of the internal materials of the battery pack. In addition, short circuit or abnormal load may occur in the external circuit of the battery pack, for example, insulation damage of the power supply line, poor contact or external equipment failure. The above situations may cause the battery pack to release a large amount of current, the temperature of the battery to rise, and the battery to be damaged or safety problems to be caused. Therefore, an effective overcurrent detection scheme is needed for the overcurrent of the battery pack, and overcurrent protection is performed. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a battery management system, a battery pack and a power utilization device, which can prevent damage caused by overcurrent.

[0004] In a first aspect, the present application provides a battery management system, comprising: a sampling resistor, the sampling resistor being connected in series with a battery pack; a current sampling chip, electrically connected with the sampling resistor, configured to monitor a first current value of the battery pack according to a voltage drop across the sampling resistor, a comparator in the current sampling chip comparing the first current value with a first current threshold, and outputting a first overcurrent signal in a case where the first current value is greater than the first current threshold; an isolation module, electrically connected with the current sampling chip and a first power supply, configured to output a second overcurrent signal to a driving chip based on a voltage signal of the first power supply in a case where the first overcurrent signal is received; a processor, electrically connected with the isolation module, configured to receive the second overcurrent signal and output an enable signal; and a driving chip, electrically connected with the processor and a fuse, configured to cause the fuse to be disconnected according to the enable signal.

[0005] According to the battery management system provided by the embodiments of the present application, the first current value flowing through the sampling resistor is collected by the current sampling chip, whether the battery pack has an overcurrent condition is determined by the built-in comparator of the current sampling chip, the first overcurrent signal is outputted in the case where the first current value is greater than the first current threshold, then the second overcurrent signal is outputted to the processor by the isolation module, the processor outputs the enable signal to the driving chip, and the driving chip causes the fuse to be disconnected according to the enable signal, so that the loop in which the battery pack is located can be disconnected in the case where the battery pack has an overcurrent, and damage to the battery pack or even the high-voltage circuit of the whole vehicle caused by overcurrent can be prevented. Moreover, the isolation module realizes communication between the current sampling chip and the processor, and the isolation module is a hardware circuit, so that the overcurrent signal can be directly outputted to the processor by the hardware circuit, and the realization does not depend on software and has fast response speed.

[0006] In a possible implementation of the first aspect, the Hall sensor is electrically connected with the battery pack and the processor, and is configured to detect a second current value of the battery pack; the processor is configured to output an enable signal to the drive chip when the second overcurrent signal is received and the second current value is greater than a second current threshold.

[0007] The current monitored by the Hall sensor HALL and the current monitored by the current sampling chip based on the sampling resistor can both be used to represent the total current of the battery pack. By combining the Hall sensor HALL and the current sampling chip to monitor the current of the battery pack respectively, the problem of misjudgment of whether overcurrent exists can be avoided, and the robustness is improved.

[0008] In a possible implementation of the first aspect, the current sampling chip comprises an analog front-end chip. In this embodiment, the existing analog front-end chip AFE is used to monitor whether the battery pack overflows, so that an additional current sampling chip does not need to be added, and the cost can be reduced.

[0009] In a possible implementation of the first aspect, a first input end of the analog front-end chip is electrically connected with a first end of the sampling resistor, and a second input end of the analog front-end chip is electrically connected with a second end of the sampling resistor.

[0010] In this embodiment, the analog front-end chip AFE with a self-provided current sampling circuit does not need to be provided with a current sampling circuit in the periphery of the analog front-end chip AFE, and the integration of the overall battery management system can be improved.

[0011] In a possible implementation of the first aspect, the battery management system further comprises a current amplifier.

[0012] A first input end of the current amplifier is electrically connected with a first end of the sampling resistor, a second input end of the current amplifier is electrically connected with a second end of the sampling resistor, and an output end of the current amplifier is electrically connected with an input end of the analog front-end chip. The current amplifier is configured to collect a voltage drop across the sampling resistor and output the voltage drop to the input end of the analog front-end chip after amplification.

[0013] The voltage drop across the sampling resistor is relatively small, and the use of the current amplifier can amplify the small voltage drop into an analog signal that can be recognized by the analog front-end chip AFE. The analog front-end chip AFE further determines the first current value according to the voltage drop and judges whether the first current value overflows.

[0014] In a possible implementation of the first aspect, the isolation module comprises an optoelectronic coupler, a first resistor, a second resistor, and a third resistor.

[0015] The first end of the optoelectronic coupler is electrically connected to the output end of the current sampling chip through a first resistor, and the second end of the optoelectronic coupler is electrically connected to a ground end.

[0016] The third end of the optoelectronic coupler is electrically connected to a power supply through a third resistor, and the fourth end of the optoelectronic coupler is electrically connected to the processor.

[0017] In the embodiment, the optoelectronic coupler is used as an isolation device, and the structure is simple, the overcurrent signal can be directly transmitted through the hardware circuit, the response speed is fast, and the isolation module is provided with multiple resistors as protection devices, so that the reliability of the battery management system is further improved.

[0018] In a possible implementation of the first aspect, the isolation module includes a relay, a fourth resistor and a fifth resistor.

[0019] The first end of the relay is electrically connected to the output end of the current sampling chip through the fourth resistor, the second end of the relay is electrically connected to the ground end, the third end of the relay is electrically connected to the power supply through the fifth resistor, and the fourth end of the relay is electrically connected to the processor.

[0020] In the embodiment, the relay is used as an isolation device, and the structure is simple, the overcurrent signal can be directly transmitted through the hardware circuit, the response speed is fast, and the isolation module is provided with multiple resistors as protection devices, so that the reliability of the battery management system is further improved.

[0021] In a possible implementation of the first aspect, the processor is further configured to:

[0022] In a case where the second overcurrent signal is received and the second current value is greater than the second current threshold, an enable signal is output to the drive chip and an overcurrent fault alarm is performed.

[0023] In a possible implementation of the first aspect, the processor is further configured to:

[0024] In a case where the second overcurrent signal is received and the number of times that the second current value is less than or equal to the second current threshold is greater than a preset number of times, a sampling fault alarm is performed.

[0025] In a possible implementation of the first aspect, the battery pack includes multiple battery cells, and the analog front-end chip is further configured to monitor a state parameter of the battery cell, the state parameter including at least one of a battery cell voltage, a battery cell current and a temperature at which the battery cell is located.

[0026] Based on the same inventive concept, in a second aspect, the embodiments of the present application provide a battery pack, including a battery pack and a battery management system as described in any one of the embodiments of the first aspect.

[0027] Based on the same inventive concept, in a third aspect, the embodiments of the present application provide a power utilization device comprising the battery pack according to any one of the embodiments of the second aspect.

[0028] The above description is only a summary of the technical solutions of the present application. In order to enable one skilled in the art to better understand the technical means of the present application, the contents of the specification can be implemented, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more obvious and easy to understand, the specific embodiments of the present application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0029] The features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0030] Figure 1 A structural schematic diagram of the battery management system provided by the embodiments of the present application is shown in FIG. 1.

[0031] Figure 2 Another structural schematic diagram of the battery management system provided by the embodiments of the present application is shown in FIG. 2.

[0032] Figure 3 Another structural schematic diagram of the battery management system provided by the embodiments of the present application is shown in FIG. 3.

[0033] Figure 4 Another structural schematic diagram of the battery management system provided by the embodiments of the present application is shown in FIG. 4.

[0034] Figure 5 Another structural schematic diagram of the battery management system provided by the embodiments of the present application is shown in FIG. 5.

[0035] Figure 6 Another structural schematic diagram of the battery management system provided by the embodiments of the present application is shown in FIG. 6.

[0036] Figure 7 A structural schematic diagram of the battery pack provided by the embodiments of the present application is shown in FIG. 7.

[0037] Figure 8 A structural schematic diagram of the power utilization device provided by the embodiments of the present application is shown in FIG. 8. DETAILED DESCRIPTION

[0038] In order to make the purposes, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0039] 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 belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising," "having," "including," and "containing" used in the description and the appended claims herein are each intended to encompass the elements or steps listed thereafter, as well as other elements or steps not specifically listed otherwise. The terms "first," "second," and the like, used in the description and the appended claims herein are used for distinguishing between similar elements or steps and do not necessarily indicate an order or sequence.

[0040] In the description of the present application, it should be noted that the terms "mounting", "connection", "connecting", "attachment" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] In view of the overcurrent problem that may exist in the battery pack, a fuse (for example, an active fuse) can be added in the battery management system, and the active fuse is disconnected when overcurrent is detected, so as to protect the circuit.

[0042] In the related art, after the current sampling chip detects overcurrent, the current sampling chip and the processor of the battery management system communicate through a serial peripheral interface (SPI), and the response speed is slow due to the limitation of the clock signal of the SPI.

[0043] In order to solve the above technical problems, the embodiments of the present application provide a battery management system, a battery pack and a power consumption device. The various embodiments of the present application will be described below with reference to the accompanying drawings.

[0044] As shown in Figure 1 The battery management system provided by the embodiments of the present application includes a sampling resistor Rs, a current sampling chip 2, an isolation module 3, a processor 4, a driving chip 5 and a fuse 6.

[0045] The sampling resistor Rs is connected in series with the battery pack 200.

[0046] For example, the battery pack 200 includes a plurality of battery cells. The positive and negative electrodes of the battery pack 200 are respectively connected with bus bars, and the sampling resistor Rs can be connected in series with the bus bar connected with the negative electrode of the battery pack 200, or the sampling resistor Rs can be connected in series with the bus bar connected with the negative electrode of the battery pack 200. The current flowing through the sampling resistor Rs represents the current of the battery pack 200.

[0047] The sampling resistor Rs is used to measure the current of the battery pack 200, and the sampling resistor Rs is a precision resistor with very small resistance. The sampling resistor Rs includes but is not limited to a shunt resistor.

[0048] The current sampling chip 2 is electrically connected with the sampling resistor Rs, and is used to monitor the first current value of the battery pack 200 according to the voltage drop across the sampling resistor Rs. The comparator inside the current sampling chip 2 compares the first current value with the first current threshold, and outputs the first overcurrent signal OC1 when the first current value is greater than the first current threshold.

[0049] The sampling resistor Rs is connected in series in the loop in which the battery pack 200 is located. The current flowing through the loop will flow through the sampling resistor Rs, thereby generating a small voltage drop across the sampling resistor Rs. Since the resistance value of the sampling resistor Rs is known, the current value flowing through the sampling resistor Rs can be calculated by measuring the voltage drop, and the current value is the first current value of the battery pack 200.

[0050] It can be understood that the current sampling chip 2 is integrated with a comparator. The comparator inside the current sampling chip 2 compares the first current value with the first current threshold. When the first current value is greater than the first current threshold, the output end GPIO of the current sampling chip 2 outputs the first overcurrent signal OC1.

[0051] It can be understood that, when the first current value is less than or equal to the first current threshold, the current sampling chip 2 does not output the first overcurrent signal.

[0052] Since the current sampling chip 2 is located in the high-voltage circuit, and the processor 4 is located in the low-voltage circuit, direct connection between the two can easily cause damage to the low-voltage circuit.

[0053] In this embodiment, an isolation module 3 is further provided. The isolation module 3 is electrically connected with the current sampling chip 2 and the first power supply V1, and the isolation module 3 is electrically connected with the processor 4. The isolation module 3 is used to output a second overcurrent signal OC2 to the processor 4 based on the voltage signal of the first power supply V1 when the first overcurrent signal OC1 is received. The isolation module 3 can realize isolated communication between the current sampling chip 2 and the processor 4, and can make the signal output by the current sampling chip 2 in the high-voltage circuit directly transmitted to the processor 4 in the low-voltage circuit without damaging the insulation state between the high-voltage circuit and the low-voltage circuit. Compared with the communication between the current sampling chip based on SPI and the processor, in this embodiment, the isolation module 3 is a hardware circuit, which can directly output the overcurrent signal to the processor, and can be realized without relying on software, with fast response speed.

[0054] It can be understood that, in the case that the current sampling chip 2 does not output the first overcurrent signal, the isolation module 3 does not output the second overcurrent signal.

[0055] The processor 4 is electrically connected with the isolation module 3 and the driving chip 5, and outputs an enable signal to the driving chip 5 in the case that the second overcurrent signal OC2 from the isolation chip 3 is received. The driving chip 5 is electrically connected with the fuse 6, and the driving chip 5 causes the fuse 6 to be disconnected according to the enable signal from the processor 4.

[0056] The processor 4 includes but is not limited to a microprogrammed control unit (MCU), and the processor 4 is a core control part of a battery management system 100 (BMS), and is responsible for signal detection and instruction control.

[0057] The fuse 6 is connected in series in a loop in which the battery pack 200 is located. The fuse 6 includes a pyrofuse, and the enable signal output by the driving chip 5 is used as an ignition signal of the fuse 6. After the ignition signal is received, an explosive fuel inside the pyrofuse is ignited, the explosive fuel drives a piston device to move rapidly, a copper bar is cut off, and the power supply of the battery pack is cut off to realize overcurrent protection.

[0058] According to the battery management system provided in the embodiments of the present application, the current sampling chip 2 is used to collect a first current value flowing through the sampling resistor Rs, the built-in comparator of the current sampling chip 2 is used to determine whether the battery pack has an overcurrent, the first overcurrent signal OC1 is output in the case that the first current value is greater than a first current threshold, then the isolation module 3 outputs the second overcurrent signal OC2 to the processor 4, the processor 4 outputs the enable signal to the driving chip 5, and the driving chip 5 disconnects the fuse 6 according to the enable signal, so that the loop in which the battery pack is located can be disconnected in the case that the battery pack has an overcurrent, and damage to the battery pack and even the high-voltage circuit of the whole vehicle caused by the overcurrent can be prevented. In addition, the isolation module 3 realizes communication between the current sampling chip 2 and the processor 4, the isolation module 3 is a hardware circuit, so that the overcurrent signal can be directly output to the processor by the hardware circuit, and the overcurrent signal can be realized without relying on software, and the response speed is fast.

[0059] In the related art, a current sampling chip needs to be additionally added in the battery management system to detect whether the battery pack has an overcurrent, and the cost is high.

[0060] In some embodiments, as shown in FIG. 1, the current sampling chip 2 includes an analog front end chip AFE. Figure 1

[0061] ​The analog front-end chip AFE is an existing chip in the battery management system. The analog front-end chip AFE integrates a plurality of acquisition channels, and can acquire a plurality of parameters of the battery pack. In this embodiment, the existing analog front-end chip AFE is used to monitor whether the battery pack 200 overflows, so that an additional current sampling chip does not need to be added, and the cost can be reduced.

[0062] In some embodiments, as shown in Figure 2 The battery management system provided by the embodiment of the present application further includes a Hall sensor HALL, which is electrically connected with the battery pack 200 and the processor 4, and is used to detect a second current value of the battery pack 200. The processor 4 is specifically configured to: in the case that the second overcurrent signal OC2 is received and the second current value is greater than a second current threshold value, output an enable signal to the drive chip.

[0063] The Hall sensor HALL is a magnetic induction sensor based on the Hall effect. The Hall sensor HALL is electrically connected with the bus connected with the battery pack. For example, the Hall sensor HALL is electrically connected with the bus connected with the positive electrode of the battery pack, or the Hall sensor HALL is electrically connected with the bus connected with the negative electrode of the battery pack.

[0064] The current monitored by the Hall sensor HALL and the current monitored by the current sampling chip 2 (for example, the analog front-end chip AFE) based on the sampling resistor Rs can both be used to represent the total current of the battery pack. By combining the Hall sensor HALL and the current sampling chip 2 (for example, the analog front-end chip AFE) to monitor the current of the battery pack respectively, the problem of misjudgment of whether overcurrent exists can be avoided, and the robustness is improved.

[0065] The first current threshold value and the second current threshold value can be set according to actual conditions. For example, the first current threshold value and the second current threshold value can be equal.

[0066] In some embodiments, the current sampling circuit can be integrated in the analog front-end chip AFE. The analog front-end chip AFE has a current sampling port. For example, the first input end in1 and the second input end in2 of the analog front-end chip AFE are current sampling ports of the analog front-end chip AFE. The first input end in1 and the second input end in2 are input ends of the current sampling circuit integrated in the analog front-end chip AFE.

[0067] As shown in Figure 2 The first input end in1 of the analog front-end chip AFE is electrically connected with the first end of the sampling resistor Rs, and the second input end in2 of the analog front-end chip AFE is electrically connected with the second end of the sampling resistor Rs. The current sampling circuit integrated in the analog front-end chip AFE determines the first current value according to the voltage drop of the signals input through the first input end in1 and the second input end in2 and the resistance value of the sampling resistor Rs.

[0068] In the embodiment, the analog front-end chip AFE is sampled with the current sampling circuit, and the current sampling circuit does not need to be additionally arranged outside the analog front-end chip AFE, so that the integration degree of the battery management system as a whole can be improved.

[0069] It can be understood that, in the embodiment, as shown in Figure 3 , the analog front-end chip AFE not only integrates the current sampling circuit 21 but also integrates a comparator 22, the output end of the current sampling circuit 21 is electrically connected with the input end of the comparator 22, and the comparator 22 compares the first current value collected by the current sampling circuit 21 with a first current threshold value to determine whether the battery pack overflows.

[0070] It should be noted that the specific circuit structure of the current sampling circuit integrated in the analog front-end chip AFE is not limited in the application, and the current collection can be realized. The specific circuit structure of the comparator integrated in the analog front-end chip AFE is also not limited, and the comparison of the current value can be realized.

[0071] In other embodiments, the analog front-end chip AFE can not include the current sampling circuit, and a current amplifier can be further arranged.

[0072] As shown in Figure 4 , the battery management system further includes a current amplifier 7, the first input end of the current amplifier 7 is electrically connected with the first end of the sampling resistor Rs, the second input end of the current amplifier 7 is electrically connected with the second end of the sampling resistor Rs, and the output end of the current amplifier 7 is electrically connected with the input end of the analog front-end chip AFE. The current amplifier 7 is used to collect the voltage drop across the sampling resistor Rs and amplify and output the voltage drop to the input end of the analog front-end chip AFE.

[0073] The current amplifier 7 has the functions of voltage drop collection and amplification, and the specific amplification multiple can be designed according to actual requirements.

[0074] The analog front-end chip AFE receives the amplified voltage drop from the current amplifier 7, and determines the first current value according to the amplified voltage drop, the resistance value of the sampling resistor Rs and the amplification multiple.

[0075] The voltage drop across the sampling resistor Rs is relatively small, and the use of the current amplifier 7 can amplify the small voltage drop into an analog signal that can be recognized by the analog front-end chip AFE. The analog front-end chip AFE further determines the first current value according to the voltage drop and determines whether the first current value overflows.

[0076] It should be noted that the specific circuit structure of the current amplifier is not limited in the application, and the functions of signal collection and amplification can be realized.

[0077] Some exemplary structures of the isolation module are described below.

[0078] In some embodiments, as shown in FIG. 1, the isolation module 3 includes an optocoupler Q1, a first resistor R1, a second resistor R2, and a third resistor R3. Figure 5 The first end of the optocoupler Q1 is electrically connected to the output end GPIO of the analog front-end chip AFE through the first resistor R1, the second end of the optocoupler Q1 is electrically connected to the ground end GND, and the two ends of the second resistor R2 are respectively electrically connected to the first end and the second end of the optocoupler Q1; the third end of the optocoupler Q1 is electrically connected to the power supply V1 through the third resistor R3, and the fourth end of the optocoupler Q1 is electrically connected to the processor 4.

[0079] The anode of the light-emitting diode in the optocoupler Q1 serves as the first end of the optocoupler Q1, the anode and cathode of the light-emitting diode in the optocoupler Q1 serve as the second end of the optocoupler Q1, and the source and drain of the switch tube in the optocoupler Q1 serve as the third end and the fourth end of the optocoupler Q1, respectively.

[0080] For example, in the case where the first current value is greater than the first current threshold, the output end GPIO of the analog front-end chip AFE outputs a high-level signal, the light-emitting diode in the optocoupler Q1 emits light, the switch tube in the optocoupler Q1 is turned on, and the voltage (e.g., 12V) provided by the power supply V1 is transmitted to the processor 4 through the third resistor R3 and the switch tube in the optocoupler Q1, i.e., the optocoupler Q1 outputs a second overcurrent signal of 12V to the processor 4.

[0081] The first resistor R1 and the third resistor R3 can be used for current limiting, and the second resistor R2 can be used for shunt, so as to protect the devices in the circuit.

[0082] In this embodiment, the optocoupler is used as the isolation device, the structure is simple, the overcurrent signal can be directly transmitted through the hardware circuit, the response speed is fast, and the isolation module is configured with multiple resistors as protection devices, so that the reliability of the battery management system is further improved.

[0083] In other embodiments, as shown in FIG. 2, the isolation module 3 includes a relay Q2, a fourth resistor R4, and a fifth resistor R5.

[0084] Figure 6 The first end of the relay Q2 is electrically connected to the output end of the analog front-end chip AFE through the fourth resistor R4, the second end of the relay Q2 is electrically connected to the ground end GND, the third end of the relay Q2 is electrically connected to the power supply V1 through the fifth resistor R5, and the fourth end of the relay Q2 is electrically connected to the processor 4.

[0085] The first end of the relay Q2 is electrically connected to the output end of the analog front-end chip AFE through the fourth resistor R4, the second end of the relay Q2 is electrically connected to the ground end GND, the third end of the relay Q2 is electrically connected to the power supply V1 through the fifth resistor R5, and the fourth end of the relay Q2 is electrically connected to the processor 4.

[0086] ​For example, in the case that the first current value is greater than the first current threshold, the output terminal GPIO of the analog front-end chip AFE outputs a high-level signal, the relay Q2 is turned on, and the voltage (for example, 12V) provided by the power supply V1 is transmitted to the processor 4 through the fifth resistor R5 and the relay Q2, that is, the relay Q2 outputs the second overcurrent signal of 12V to the processor 4.

[0087] The fourth resistor R4 and the fifth resistor R5 can be used for current limiting to protect the devices in the circuit.

[0088] In the embodiment, the relay is used as the isolation device, the structure is simple, the overcurrent signal can be directly transmitted through the hardware circuit, and the response speed is fast. In addition, the isolation module is configured with multiple resistors as protection devices, and the reliability of the battery management system is further improved.

[0089] In some embodiments, as shown in Figure 5 or Figure 6 The battery management system can further include a power module 8, the power module 8 is electrically connected with the power supply V1, the processor 4 and the driving chip 5, and the power module 8 is used for converting the voltage of the power supply V1, so as to provide a stable power supply for the processor 4 and the driving chip 5.

[0090] In some embodiments, the processor 4 is further configured to: in the case that the second overcurrent signal is received and the second current value is greater than the second current threshold, output an enable signal to the driving chip and perform an overcurrent fault alarm; and / or in the case that the second overcurrent signal is received and the number of times that the second current value is less than or equal to the second current threshold is greater than a preset number of times, perform a sampling fault alarm.

[0091] It should be noted that the present application is not strictly limited to the case that the processor performs the overcurrent fault alarm at the same time when the enable signal is output to the driving chip. The processor can complete both the output of the enable signal to the driving chip and the overcurrent fault alarm.

[0092] In the case that the analog front-end chip AFE monitors that the battery pack has an overcurrent problem, the processor 4 receives the second overcurrent signal. In the case that the second current value monitored by the Hall sensor HALL is greater than the second current threshold, it is indicated that the battery pack has an overcurrent problem based on the current monitored by the Hall sensor HALL. In the case that the currents monitored by both the Hall sensor HALL and the analog front-end chip AFE are determined to have an overcurrent problem, the enable signal is output to the driving chip to make the fuse disconnect, and the overcurrent fault alarm can also be performed, so that the overcurrent fault can be timely and effectively handled subsequently.

[0093] The analog front-end chip AFE and the Hall sensor HALL monitor the total current of the battery pack. If one of them detects an overcurrent problem and the other does not detect an overcurrent problem, it indicates that at least one of them has a current sampling fault. In this case, a sampling fault alarm is performed so as to facilitate subsequent timely and effective processing of the sampling fault.

[0094] As introduced above, the analog front-end chip AFE is an existing chip in the battery management system. In some embodiments, the battery pack includes a plurality of battery cells, and the analog front-end chip AFE is further configured to monitor state parameters of the battery cells, the state parameters including at least one of a battery cell voltage, a battery cell current, and a temperature at which the battery cell is located. The processor 4 receives the state parameter information of the battery cells collected by the analog front-end chip AFE to perform real-time analysis to support other functional requirements of the system.

[0095] Based on the same inventive concept, the embodiments of the present application also provide a battery pack. As shown in Figure 7 The battery pack 1000 includes the battery pack 200 and the battery management system 100 in any of the above embodiments. It can be understood that the battery pack has the beneficial effects of the battery management system provided by the embodiments of the present application, and specific descriptions can be referred to the specific descriptions of the battery management system in the above embodiments. The present embodiment will not be described here again.

[0096] Based on the same inventive concept, the present application also provides a power utilization device. As shown in Figure 8 The power utilization device 2000 includes the battery pack 1000. The battery pack 1000 includes the battery management system in any of the above embodiments. It can be understood that the power utilization device has the beneficial effects of the battery management system provided by the embodiments of the present application, and specific descriptions can be referred to the specific descriptions of the battery management system in the above embodiments. The present embodiment will not be described here again.

[0097] It should be noted that in the above embodiments, the resistance is in the form of a single resistance. In other embodiments, the resistance can also be an integrated series, parallel or mixed resistance. In addition, in the above embodiments, the capacitor is in the form of a single capacitor. In other embodiments, the capacitor can also be an integrated series, parallel or mixed capacitor. The specific parameters of each device can be set according to actual needs, which are not limited in the present application.

[0098] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0099] Although the present application has been described with reference to preferred embodiments, it is to be understood that various modifications can change the scope of the present application to the full extent the equivalent thereof are intended to be within this application, and that each of the technical features mentioned in the various embodiments can be combined in an arbitrary 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 by, The battery management system comprises: a sampling resistor connected in series with the battery pack; a current sampling chip electrically connected with the sampling resistor, configured to monitor a first current value of the battery pack according to a voltage drop across the sampling resistor, and a comparator inside the current sampling chip compares the first current value with a first current threshold, and outputs a first overcurrent signal in a case where the first current value is greater than the first current threshold; an isolation module electrically connected with the current sampling chip and a first power supply, configured to output a second overcurrent signal based on a voltage signal of the first power supply in a case where the first overcurrent signal is received; a processor electrically connected with the isolation module, configured to receive the second overcurrent signal and output an enable signal to a drive chip; a drive chip electrically connected with the processor and a fuse, configured to cause the fuse to be disconnected according to the enable signal, and the fuse is connected in series with the battery pack.

2. The battery management system of claim 1, wherein, Further comprising: a Hall sensor electrically connected with the battery pack and the processor, configured to detect a second current value of the battery pack; the processor is configured to output the enable signal to the drive chip in a case where the second overcurrent signal is received and the second current value is greater than a second current threshold.

3. The battery management system of claim 1, wherein, The current sampling chip comprises an analog front-end chip.

4. The battery management system of claim 3, wherein, A first input end of the analog front-end chip is electrically connected with a first end of the sampling resistor, and a second input end of the analog front-end chip is electrically connected with a second end of the sampling resistor.

5. The battery management system of claim 3, wherein, The battery management system further comprises a current amplifier; a first input end of the current amplifier is electrically connected with the first end of the sampling resistor, a second input end of the current amplifier is electrically connected with the second end of the sampling resistor, and an output end of the current amplifier is electrically connected with an input end of the analog front-end chip, and the current amplifier is configured to collect a voltage drop across the sampling resistor and output the voltage drop to the input end of the analog front-end chip after amplification.

6. The battery management system of any one of claims 1-5, wherein, The isolation module comprises an optoelectronic coupler, a first resistor, a second resistor and a third resistor; a first end of the optoelectronic coupler is electrically connected with an output end of the current sampling chip through the first resistor, a second end of the optoelectronic coupler is electrically connected with a ground end, and two ends of the second resistor are respectively electrically connected with the first end and the second end of the optoelectronic coupler; a third end of the optoelectronic coupler is electrically connected with a power supply through the third resistor, and a fourth end of the optoelectronic coupler is electrically connected with the processor.

7. The battery management system of any one of claims 1-5, wherein, The isolation module comprises a relay, a fourth resistor and a fifth resistor; a first end of the relay is electrically connected with the output end of the current sampling chip through the fourth resistor, a second end of the relay is electrically connected with the ground end, a third end of the relay is electrically connected with the power supply through the fifth resistor, and a fourth end of the relay is electrically connected with the processor.

8. The battery management system of claim 2, wherein, The processor is further configured to: output the enable signal to the drive chip and perform overcurrent fault alarm in a case where the second overcurrent signal is received and the second current value is greater than the second current threshold.

9. The battery management system of claim 2, wherein, The processor is further configured to: In a case where the second overcurrent signal is received and the number of cycles in which the second current value is less than or equal to a second current threshold is greater than a preset number of times, a sampling fault alarm is performed.

10. The battery management system of any one of claims 3-5, wherein, The battery pack includes a plurality of battery cells, and the analog front-end chip is further configured to monitor a state parameter of the battery cells, the state parameter including at least one of a battery cell voltage, a battery cell current, and a temperature at which the battery cell is located.

11. A battery pack, characterized by, A battery management system as claimed in any one of claims 1-10.

12. An electrical device, characterized by A battery pack as claimed in claim 11. A battery pack as claimed in claim 11.

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