Battery management system, battery pack and electric driving equipment

Abstract

The utility model discloses a battery management system, a battery pack and an electric driving device, the battery management system comprises an impedance adjusting circuit and a control circuit, the impedance adjusting circuit comprises a first resistor branch, the first resistor branch is connected in parallel with a communication bus to be tested, and the impedance adjusting circuit is connected with the control circuit; wherein a first end of the impedance adjusting circuit is connected with a power supply, and a second end of the impedance adjusting circuit is connected with a ground end; the control circuit is configured to send a first control signal to the impedance adjusting circuit on the basis of the voltage values at the two ends of the impedance adjusting circuit under the condition of determining that the to-be-tested terminal resistor does not exist in the to-be-tested communication bus; and the impedance adjusting circuit is configured to provide configuration resistance for the communication bus to be tested through the first resistance branch in response to the first control signal. The terminal resistance mismatching condition can be avoided, the labor cost can be reduced, the communication reliability of the to-be-tested communication bus is improved, and the development efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of power electronics, especially to a battery management system, a battery pack and an electric drive device. BACKGROUND

[0002] Controller Area Network (CAN) is a communication protocol widely used in automotive environment, which can realize efficient communication between multiple devices.

[0003] The terminal resistor is an important component in the CAN communication bus, which prevents signal reflection in the CAN communication bus and reduces noise. However, different models of CAN communication buses have different terminal resistor states. The mismatch of the terminal resistor will cause the CAN communication bus to fail to communicate normally. However, the related technology is difficult to detect whether the CAN communication bus has a terminal resistor. SUMMARY

[0004] The utility model mainly provides a kind of battery management system, battery pack and electric drive device, not only can avoid the situation of terminal resistor mismatch, but also can reduce cost, and then improve the communication reliability of the communication bus to be measured, simultaneously, it also improves development efficiency.

[0005] The technical solution of the utility model is as follows:

[0006] In the first aspect, the utility model embodiment provides a kind of battery management system, and the battery management system includes impedance adjustment circuit and control circuit, and impedance adjustment circuit includes first resistance branch, and first resistance branch is connected in parallel on the communication bus to be measured, and impedance adjustment circuit is connected with control circuit;Wherein:

[0007] The first end of impedance adjustment circuit is connected with power supply, and the second end of impedance adjustment circuit is connected with ground terminal;

[0008] Control circuit is configured to determine that there is no terminal resistor to be measured in the communication bus to be measured based on the voltage value between impedance adjustment circuit, and first control signal is sent to impedance adjustment circuit under the condition that the communication bus to be measured is determined to be measured;

[0009] Impedance adjustment circuit is configured to provide configuration resistance for the communication bus to be measured through first resistance branch in response to first control signal.

[0010] By the above technical means, the impedance adjusting circuit is connected in parallel with the communication bus to be tested, and the control circuit determines whether the terminal resistor to be tested exists in the communication bus to be tested according to the voltage value collected at the two ends of the impedance adjusting circuit. In the case that it is determined that the terminal resistor to be tested does not exist, the impedance adjusting circuit automatically provides the configuration resistor for the communication bus to be tested. In this way, it can be determined whether the configuration resistor is provided for the communication bus to be tested in a timely and accurate manner according to the detection of the terminal resistor to be tested in the communication bus to be tested. In this way, it can be ensured that the terminal resistor exists in the communication bus to be tested, and the situation that the terminal resistor is not matched is avoided, thereby improving the communication reliability of the communication bus to be tested. Moreover, manual detection intervention is not required, the labor cost is reduced, and the development efficiency is improved.

[0011] In some embodiments, the impedance adjusting circuit further comprises a second resistance branch; wherein: the first resistance branch comprises a first configuration unit and a switch unit, and the second resistance branch is connected in parallel with the first configuration unit; the first end of the first configuration unit is connected with the power supply and the first end of the control circuit respectively, the second end of the first configuration unit is connected with the first end of the switch unit, and the second end of the switch unit is connected with the ground and the second end of the control circuit respectively.

[0012] By the above technical means, the control circuit determines whether the terminal resistor to be tested is set in the communication bus to be tested according to the voltage value at the two ends of the impedance adjusting circuit. When the terminal resistor to be tested is not set in the communication bus to be tested, the control circuit controls the configuration resistor inside the first resistance branch to replace the terminal resistor to be tested to work. In this way, the control circuit can not only detect whether the terminal resistor to be tested exists based on the voltage value at the two ends of the second resistance branch, but also can further make the switch inside the first resistance branch conductive by the control signal output by the control circuit when the terminal resistor to be tested does not exist, so that the configuration resistor is connected, the control circuit can automatically configure the terminal resistor for the communication bus to be tested, and the communication bus to be tested can normally communicate, the situation that the terminal resistor is not matched is avoided, and the communication reliability of the communication bus to be tested is improved.

[0013] In some embodiments, the second resistance branch comprises a first resistor; wherein: the first end of the first resistor is connected with the first end of the first configuration unit, the power supply and the first end of the control circuit respectively; and the second end of the first resistor is connected with the second end of the first configuration unit and the first end of the switch unit respectively.

[0014] By the above technical means, the first resistor is contained in the second resistance branch, and the control circuit determines whether the terminal resistor to be tested in parallel with the first resistor exists according to the difference between the first voltage value and the second voltage value collected at the two ends of the impedance adjusting circuit and the current value output by the power supply. In this way, the self-checking of whether the terminal resistor to be tested exists can be realized by using a simple circuit, and the development efficiency is improved.

[0015] In some embodiments, the first configuration unit comprises a configuration resistor and a first switch, and the switch unit comprises a second switch; wherein: a first end of the configuration resistor is connected with a first end of the first resistor, the power supply and a first end of the control circuit respectively, and a second end of the configuration resistor is connected with a first end of the first switch; a second end of the first switch is connected with a second end of the first resistor and a first end of the second switch respectively; and a second end of the second switch is connected with a second end of the control circuit and a ground end respectively.

[0016] Through the above technical means, the first configuration unit comprises a configuration resistor and a first switch, and the switch unit comprises a second switch, wherein the configuration resistor is used to provide a matching terminal resistor to the communication bus under test when no terminal resistor is set in the communication bus under test, so as to avoid the influence of no terminal resistor under test on normal communication, and improve the communication reliability; the first switch is used to be turned on when it is detected that no terminal resistor under test is set in the communication bus under test, so as to ensure that the terminal impedance of the communication bus under test remains consistent; and the second switch is used to be turned on when the first voltage value and the second voltage value between the impedance adjustment circuit are detected, so as to ensure that the collection of the voltage values is based on the ground, and improve the accuracy of the collected voltage values.

[0017] In some embodiments, the second switch is configured to be in a conductive state in response to a second control signal sent by the control circuit, so as to make the control circuit collect the voltage values between the first resistor branch.

[0018] Through the above technical means, the second switch is in a conductive state based on the second control signal sent by the control circuit, so as to make the control circuit collect the voltage values between the first resistor branch, and determine whether there is a terminal resistor under test in the communication bus under test, thereby improving the communication reliability.

[0019] In some embodiments, the second switch is further configured to be in a disconnected state in response to a third control signal sent by the control circuit in a case where it is determined that there is a terminal resistor under test in the communication bus under test.

[0020] Through the above technical means, the control circuit controls the first switch and the second switch to be turned on or turned off by sending control signals to the first switch and the second switch. In this way, different circuit connections are realized by controlling the states of the first switch and the second switch, the second switch is controlled to be disconnected in a case where it is determined that there is a terminal resistor under test in the communication bus under test, the impedance matching consistency of the terminal of the communication bus under test is ensured, and the communication reliability is improved.

[0021] In some embodiments, the first switch is configured to be in a conductive state in response to a fourth control signal sent by the control circuit in a case where it is determined that there is no terminal resistor under test in the communication bus under test; and the second switch is configured to be in a disconnected state in response to a fifth control signal sent by the control circuit in a case where it is determined that there is no terminal resistor under test in the communication bus under test.

[0022] Through the technical means, the control circuit controls the first switch and the second switch by sending control signals to the first switch and the second switch, and controls the conduction or turn-off of the first switch and the second switch. In this way, different circuit connections are realized by controlling the state of the first switch and the second switch, and in the case where it is determined that the terminal resistance to be detected does not exist in the communication bus to be detected, the configuration resistance is connected, the impedance matching consistency of the terminal of the communication bus to be detected is ensured, and the communication reliability is improved.

[0023] In some embodiments, the battery management system further comprises a power supply, the power supply comprising a power supply chip, a third resistor and a fourth resistor; wherein: the first end of the power supply chip is connected with the first end of the third resistor, the second end of the third resistor is connected with the second end of the power supply chip and the first end of the fourth resistor respectively; the second end of the fourth resistor is connected with the first end of the impedance adjustment circuit and the first end of the control circuit respectively.

[0024] Through the technical means, the power supply can comprise a power supply chip, a third resistor and a fourth resistor, and the output current can be continuously stable.

[0025] In some embodiments, the resistance value of the first resistor, the resistance value of the configuration resistance and the resistance value of the terminal resistance to be detected are equal.

[0026] Through the technical means, the resistance value of the first resistor, the resistance value of the configuration resistance and the resistance value of the terminal resistance to be detected are equal, so that the type of the resistance device can be reduced, the inventory can be avoided, the calculation of the control circuit is facilitated, and the detection efficiency and the matching accuracy are improved.

[0027] In the second aspect, the utility model embodiment provides a battery pack, the battery pack comprises the battery management system of any one of the first aspect.

[0028] In the third aspect, the utility model embodiment provides an electric drive device, the electric drive device comprises the battery pack of the second aspect.

[0029] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, but not limiting the technical scheme of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The utility model embodiment provides a kind of component structure diagram of battery management system Figure One ;

[0031] Figure 2 The utility model embodiment provides a kind of component structure diagram of battery management system Figure Two ;

[0032] Figure 3The utility model provides a kind of battery management system's composition structure schematic diagram for the utility model embodiment provides Figure Three ;

[0033] Figure 4 The utility model provides a kind of battery management system's composition structure schematic diagram for the utility model embodiment provides Figure Four ;

[0034] Figure 5 The utility model provides a kind of battery management system's composition structure schematic diagram for the utility model embodiment provides a kind of battery pack's composition structure schematic diagram;

[0035] Figure 6 The utility model provides a kind of battery management system's execution flow schematic diagram for the utility model embodiment provides

[0036] Figure 7 The utility model provides a kind of battery management system's application scene schematic diagram for the utility model embodiment provides

[0037] Figure 8 The utility model provides a kind of battery management system's application scene schematic diagram for the utility model embodiment provides a kind of electric drive equipment's composition structure schematic diagram. DETAILED DESCRIPTION

[0038] In order to be able to more detailedly understand the characteristics and technical content of the utility model embodiment, the implementation of the utility model embodiment is described in detail below in conjunction with the drawings, the attached drawings are only for reference, and are not used to limit the utility model embodiment.

[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 the utility model belongs. The terms used herein are only for the purpose of describing the utility model embodiments, and are not intended to limit the utility model.

[0040] In the following description, "some embodiments" are involved, which describe a subset of all possible embodiments, but it can be understood that "some embodiments" can be the same subset or different subset of all possible embodiments, and can be combined with each other without conflict.

[0041] It should also be noted that the terms "first, second, third" involved in the utility model embodiments are only used to distinguish similar objects, and do not represent the specific order of the objects. Understandably, "first, second, third" can be interchanged with specific order or sequence as allowed, so that the utility model embodiments described here can be implemented in an order other than that illustrated or described here.

[0042] In addition, reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. As will be apparent to those of ordinary skill in the art, embodiments described herein can be combinable with other embodiments.

[0043] The related technologies of the application will be introduced below.

[0044] New energy batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used, in addition, batteries are also increasingly used in energy storage fields and the like.

[0045] At present, new energy batteries are increasingly widely used in life and industry. New energy batteries are not only applied to energy storage power supply systems such as water power, fire power, wind power and solar power stations, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also increasing.

[0046] In the embodiments of the application, the battery can be a battery monomer, or can also be a battery pack (Pack) composed of a plurality of battery monomers. The battery monomer refers to a basic unit capable of realizing mutual conversion between chemical energy and electrical energy, and can be used to make a battery module or a battery pack, so as to be used to supply power to an electric device. The battery monomer can be a secondary battery, which refers to a battery monomer that can be activated by charging after discharging. The battery monomer can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., and the embodiments of the present disclosure are not limited thereto.

[0047] In the embodiments of the application, the battery can also be a single physical module including one or more battery monomers to provide higher voltage and capacity. When there are a plurality of battery monomers, the plurality of battery monomers are connected in series, in parallel or in a mixed manner through a current combining component.

[0048] The functions of new energy vehicles are gradually increasing, and the requirements for the battery management system (Battery Management System, BMS) are also increasingly harsh. The CAN communication bus can be used as the communication bus inside the BMS, and can also be used as the communication between the BMS and other control units or vehicle-mounted devices in the new energy vehicle.

[0049] Generally, based on the transmission line principle, when a signal encounters an impedance discontinuity during propagation, a reflected wave is generated. This reflected signal, superimposed on the original signal, alters the original signal's shape, causing signal loss or distortion, affecting communication quality, or even preventing normal communication. Therefore, by adding a terminating resistor at both ends of the CAN communication bus, matching the characteristic impedance of the cable, signal reflection and echo absorption at the CAN communication bus ends can be achieved, preventing the reflected waveform from superimposing on the original waveform and thus avoiding impact on communication quality.

[0050] However, different models of CAN communication buses may or may not have terminating resistors when they leave the factory. However, the relevant technology is difficult to realize automatically whether the CAN communication bus has terminating resistors. It is necessary to manually check whether there are terminating resistors at both ends of the CAN communication bus during on-site debugging, and to solder matching terminating resistors to the CAN communication bus that does not have matching terminating resistors. Such operation not only increases labor costs and reduces development efficiency, but also poses potential safety risks due to measurement abnormalities.

[0051] Based on this, this utility model embodiment provides a battery management system, a battery pack, and an electric drive device. An impedance adjustment circuit is connected in parallel to the communication bus under test. The control circuit determines whether a terminating resistor exists in the communication bus under test based on the collected voltage values ​​across the impedance adjustment circuit. If no terminating resistor exists, the impedance adjustment circuit automatically provides a configuration resistor to the communication bus under test. This allows for timely and accurate determination of whether to provide a configuration resistor based on the detected terminating resistor in the communication bus under test, ensuring the presence of a terminating resistor and avoiding terminating resistor mismatch, thereby improving the communication reliability of the communication bus under test. Furthermore, it eliminates the need for manual detection intervention, reducing labor costs and improving development efficiency.

[0052] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0053] In one embodiment of this utility model, Figure 1 A schematic diagram of the composition structure of a battery management system provided in this embodiment of the present invention. Figure One .like Figure 1 As shown, the battery management system 10 includes an impedance adjustment circuit 101 and a control circuit 102. The impedance adjustment circuit 101 includes a first resistor branch 1011, which is connected in parallel to the communication bus under test 20. The impedance adjustment circuit 101 is connected to the control circuit 102.

[0054] The first terminal of the impedance adjustment circuit 101 is connected to the power supply 103, and the second terminal of the impedance adjustment circuit 101 is connected to the ground terminal.

[0055] The control circuit 102 is configured to send a first control signal to the impedance adjusting circuit 101 in a case where it is determined that the terminal resistance 201 under test does not exist in the communication bus 20 under test based on the voltage value across the impedance adjusting circuit 101.

[0056] The impedance adjusting circuit 101 is configured to provide a configuration resistance for the communication bus 20 under test through the first resistance branch 1011 in response to the first control signal.

[0057] In the embodiments of the utility model, the communication bus 20 under test can be a CAN communication bus, and the terminal resistance 201 under test can be a terminal resistance on the CAN communication bus. It should be understood that Figure 1 As shown, the terminal resistance 201 under test exists on the communication bus 20 under test, and in some embodiments, the terminal resistance 201 under test can not exist on the communication bus 20 under test. Whether the terminal resistance 201 under test exists on the communication bus 20 under test or not, the terminal of the communication bus 20 under test is connected in parallel with the impedance adjusting circuit 101. Exemplarily, in a case where the communication bus 20 under test uses twisted pair as a physical medium, two signal lines CAN_H and CAN_L of the communication bus 20 under test can be connected in parallel with both ends of the impedance adjusting circuit 101, wherein both ends of the terminal resistance 201 under test can be connected with the two signal lines CAN_H and CAN_L respectively.

[0058] In the embodiments of the utility model, the impedance adjusting circuit 101 includes resistors, switches and other devices, and based on the power supply of the power supply, the control circuit 102 obtains the voltage value across the impedance adjusting circuit 101, so that the control circuit 102 can determine whether the terminal resistance 201 under test exists on the communication bus 20 under test according to the voltage value across the impedance adjusting circuit 101. Wherein, when the control circuit 102 determines that the terminal resistance 201 under test does not exist on the communication bus 20 under test, the impedance adjusting circuit 101 can also be used to receive the first control signal sent by the control circuit 102, and respond to the first control signal to control the internal switch to turn on and connect the configuration resistance to the communication bus 20 under test, so as to realize the adjustment of the terminal impedance of the communication bus 20 under test. Here, the circuit structure of the impedance adjusting circuit 101 is not specifically limited; and Figure 1 The circuit structure of the battery management system is only schematically provided, and the circuit structure thereof is not specifically limited.

[0059] In the embodiments of the utility model, the power supply 103 can be a constant current source, which is used as a power supply with stable output current value to supply power for the battery management system 10. Exemplarily, the current value output by the power supply 103 can be 1mA.

[0060] In the embodiment of the utility model, control circuit 102 can be microcontroller unit (MCU), be used to gather impedance adjustment circuit 101 first end's first voltage value and impedance adjustment circuit 101 second end's second voltage value, or also can be said to gather the voltage value of both ends of impedance adjustment circuit 101.

[0061] In a possible implementation, assuming that there is a terminal resistance to be measured on the communication bus 20 to be measured, the control circuit 102 determines the voltage value across the impedance adjustment circuit 101 based on Ohm's law, i.e., the preset voltage value in the embodiment of the application. After actually accessing the communication bus 20 to be measured, the control circuit 102 collects the first voltage value and the second voltage value across the impedance adjustment circuit 101, determines the voltage value across the impedance adjustment circuit 101 according to the difference between the first voltage value and the second voltage value, and further determines whether there is a terminal resistance 201 to be measured by comparing whether the currently collected voltage value is consistent with the preset voltage value. Exemplarily, if the voltage value across the impedance adjustment circuit 101 is consistent with the preset voltage value, it indicates that there is a terminal resistance 201 to be measured in the communication bus 20 to be measured; if the voltage value across the impedance adjustment circuit 101 is inconsistent with the preset voltage value, it indicates that there is no terminal resistance 201 to be measured in the communication bus 20 to be measured. In the case where there is no terminal resistance 201 to be measured in the communication bus 20 to be measured, the control circuit 102 sends a first control signal to the impedance adjustment circuit 101 to control the switch in the impedance adjustment circuit 101 to be turned on, so as to connect the configuration resistance in the first resistance branch 1011 to the communication bus 20 to be measured, and provide the configuration resistance equivalent to the terminal resistance 201 to be measured for the communication bus 20 to be measured.

[0062] In another possible implementation, the control circuit 102 can also collect the voltage value across the impedance adjustment circuit 101 before the communication bus 20 to be measured, determine the voltage difference before access, and after actually accessing the communication bus 20 to be measured, the control circuit 102 collects the voltage value across the impedance adjustment circuit 101 again, determines the voltage difference after access, compares the voltage difference after access with the voltage difference before access, and if the voltage difference after access is inconsistent with the voltage difference before access, it is determined that there is a terminal resistance 201 to be measured in the communication bus 20 to be measured, otherwise, if they are consistent, it is determined that there is no terminal resistance 201 to be measured in the communication bus 20 to be measured.

[0063] It should be noted that the control circuit 102 can integrate a hardware module for collecting the voltage value across the impedance adjustment circuit 101, such as an analog-to-digital converter (ADC), or in some embodiments, a hardware module capable of voltage collection can be provided across the impedance adjustment circuit 101, and the voltage values across the impedance adjustment circuit 101 are collected by the two voltage collection modules and sent to the control circuit 102.

[0064] It should be noted that in the embodiments of the present application, the control circuit 102 obtains the voltage value across the impedance adjustment circuit 101, i.e. the voltage difference across the impedance adjustment circuit 101, which can be determined by collecting the first voltage value of the first end of the impedance adjustment circuit 101 relative to the ground end and the second voltage value of the second end of the impedance adjustment circuit 101 relative to the ground end, and then subtracting; or it can be obtained directly based on the differential voltage sampling method. Since the impedance adjustment circuit 101 is connected in series between the power supply 103 and the ground, and contains a resistor in the circuit, the voltage difference across the impedance adjustment circuit 101 before the impedance adjustment circuit 101 is connected to the communication bus 20 under test can be determined based on Ohm's law and the current value provided by the power supply 103. The voltage difference is compared with the difference between the first voltage value and the second voltage value detected before the communication bus 20 under test is connected. If they are consistent, it means that the communication bus 20 under test does not contain the terminal resistance 201 under test. Otherwise, if they are inconsistent, it means that the first voltage value and the second voltage value across the impedance adjustment circuit 101 have changed due to the parallel or series connection of the terminal resistance 201 under test and the resistor in the impedance adjustment circuit 101. In this way, the difference between the first voltage value and the second voltage value is different from the voltage difference across the impedance adjustment circuit 101 before the communication bus 20 under test is connected, that is, the communication bus 20 under test contains the terminal resistance 201 under test.

[0065] It should also be noted that if it is determined that the communication bus 20 under test does not contain the terminal resistance 201 under test, the control circuit 102 can send a first control signal to the impedance adjustment circuit 101 to change the connection relationship of the circuit through the switch and enable the configuration resistance in the first resistance branch 1011, which is equivalent to the terminal resistance 201 under test connected in parallel to the terminal of the communication bus 20 under test, replacing the function of the terminal resistance 201 under test and ensuring normal communication.

[0066] It should also be noted that after the configuration resistance is connected in parallel to the terminal of the communication bus 20 under test, the control circuit 102 can also collect the first voltage value and the second voltage value across the impedance adjustment circuit 101 based on the same judgment method as described above to determine whether the configuration resistance has been correctly connected.

[0067] The utility model embodiment provides a kind of battery management system, impedance adjusting circuit is connected in parallel on the communication bus to be measured, and control circuit determines whether there is terminal resistance to be measured in the communication bus to be measured according to the voltage value of the impedance adjusting circuit two ends of collection, impedance adjusting circuit provides configuration resistance for the communication bus to be measured in the case where there is no terminal resistance to be measured. Thus, it can be timely, accurately according to the detection condition of terminal resistance to be measured in the communication bus to be measured, determine whether to provide configuration resistance for it, so, it can guarantee that there is terminal resistance in the communication bus to be measured, avoid the case where terminal resistance is not matched, and then improve the communication reliability of the communication bus to be measured. Moreover, without manual detection intervention, reduce the labor cost, improve development efficiency.

[0068] In another embodiment of the utility model, Figure 2 The utility model embodiment provides a kind of battery management system's component structure diagram Figure Two As shown in Figure 2 Impedance adjusting circuit further includes second resistance branch 1012;Wherein:

[0069] First resistance branch 1011 includes first configuration unit 1013 and switch unit 1014, and second resistance branch 1012 is connected in parallel with first configuration unit 1013;

[0070] The first end of first configuration unit 1013 is connected with power supply 103 and the first end of control circuit 102 respectively, and the second end of first configuration unit 1013 is connected with the first end of switch unit 1014, and the second end of switch unit 1014 is connected with ground and the second end of control circuit 102 respectively.

[0071] In the utility model embodiment, the two ends of second resistance branch 1012 are connected in parallel on first resistance branch 1011, and first resistance branch 1011 and second resistance branch 1012 can include resistance, switch and other devices, and the specific circuit structure is not limited here.

[0072] It should be noted that when the control circuit 102 collects the voltage value across the impedance adjusting circuit, that is, the voltage value across the first resistance branch 1011 in the embodiment of the utility model, that is, the first voltage value of the first end of the first configuration unit 1013 and the second voltage value of the second end of the second end 1014 of the switch unit 1014, in order to avoid the influence of the resistance in the first resistance branch 1011 on the detection result, the first configuration unit 1013 can be controlled to be disconnected, and the control circuit 102 determines the voltage difference across the first resistance branch 1011 before the communication bus 20 to be detected is accessed according to the current value output by the power supply 103 and the resistance value of the second resistance branch 1012.In the absence of the terminal resistance 201 to be detected in the communication bus 20 to be detected, the difference between the first voltage value and the second voltage value collected by the control circuit 102 across the first resistance branch 1011 is consistent with the voltage difference across the first resistance branch 1011 before the communication bus 20 to be detected is accessed determined as described above; otherwise, in the presence of the terminal resistance 201 to be detected in the communication bus 20 to be detected, the terminal resistance 201 to be detected is connected in parallel with the second resistance branch 1012, so that the resistance value between the two ends of the first resistance branch 1011 changes, and in the case that the current value remains unchanged, the difference between the first voltage value and the second voltage value collected by the control circuit 102 also changes, thereby making the difference determined by the collection inconsistent with the voltage difference across the first resistance branch 1011 before the communication bus 20 to be detected is accessed determined as described above.

[0073] It should be further noted that in the case that it is determined that there is no terminal resistance 201 to be detected in the communication bus 20 to be detected, the control circuit 102 can control the first resistance branch 1011 to be turned on, so that the configuration resistance inside the first resistance branch 1011 is connected in parallel with the terminal of the communication bus 20 to be detected, and the equivalent terminal resistance 201 to be detected is realized in the communication bus 20 to be detected, thereby realizing the function of the terminal resistance 201 to be detected.

[0074] The embodiment of the utility model provides a kind of battery management system, and control circuit determines whether the terminal resistance to be detected is arranged in the communication bus to be detected according to the voltage value across the impedance adjusting circuit;When the terminal resistance to be detected is not arranged in the communication bus to be detected, control circuit controls the configuration resistance inside the first resistance branch to replace terminal resistance to be detected and work.So, control circuit not only can realize detection to terminal resistance to be detected based on the voltage value across the second resistance branch;Also further when terminal resistance to be detected does not exist, the switch inside the first resistance branch is turned on by the control signal output by control circuit, so that configuration resistance is accessed, and control circuit can be configured to terminal resistance for communication bus to be detected, thereby ensuring that communication bus to be detected can normally communicate, avoid the case that terminal resistance does not match, improve the communication reliability of communication bus to be detected.

[0075] In another embodiment of the utility model,Figure 3 A composition structure of a battery management system is provided in the embodiment of the utility model Figure Three . As Figure 3 indicated, the second resistance branch 1012 includes a first resistance R1;wherein:

[0076] The first end of the first resistance R1 is connected with the first end of the first configuration unit 1013, the power supply 103 and the first end of the control circuit 102 respectively;

[0077] The second end of the first resistance R1 is connected with the second end of the first configuration unit 1013 and the first end of the switch unit 1014 respectively.

[0078] In the embodiment of the utility model, exemplaryly, the resistance value of the first resistance R1 can be 120Ω, in the case that the current output by the power supply 103 is 1mA, based on Ohm's law, the voltage difference between the two ends of the first resistance branch 1012 should be 120V.

[0079] It needs to be explained that, if the terminal resistance 201 to be measured does not exist in the communication bus to be measured, only the first resistance R1 is connected in series in the circuit, and the difference between the first voltage value and the second voltage value collected by the control circuit 102 is 120V;Otherwise, if the terminal resistance 201 to be measured exists in the communication bus to be measured, and the resistance value of the terminal resistance 201 to be measured is 120Ω, then the first resistance R1 is connected in parallel with the terminal resistance 201 to be measured, then the difference between the first voltage value and the second voltage value collected by the control circuit 102 is U1=(RL / / R1)*I=60V, which is inconsistent with the voltage value in the case that only the first resistance R1 is connected in series in the circuit, so that it can be determined that the terminal resistance 201 to be measured exists in the communication bus to be measured. Wherein, RL is the resistance value of the terminal resistance 201 to be measured, and I is the current value output by the power supply 103.

[0080] The embodiment of the utility model provides a kind of battery management system, first resistance is contained in second resistance branch, and control circuit determines whether the terminal resistance to be measured in parallel with first resistance exists according to the difference between the first voltage value and the second voltage value of impedance adjustment circuit collected, and the current value output by power supply, so that it can be realized to the self-checking of terminal resistance to be measured whether existence using simple circuit, improve development efficiency.

[0081] In some embodiments, continue to refer to Figure 3 , the first configuration unit 1013 includes configuration resistance R2 and first switch K1, and the switch unit 1014 includes second switch K2;Wherein:

[0082] The first end of the resistance R2 is connected with the first end of the first resistance R1, the power supply 103 and the first end of the control circuit 102 respectively, and the second end of the resistance R2 is connected with the first end of the first switch K1.

[0083] The second end of the first switch K1 is connected with the second end of the first resistance R1 and the first end of the second switch K2 respectively, and the second end of the second switch K2 is connected with the second end of the control circuit 102 and the ground end.

[0084] In the embodiment of the utility model, after the terminal access impedance adjustment circuit of the communication bus to be measured, the control circuit 102 controls the first switch K1 to be disconnected and the second switch K2 to be conducted, in the case that the terminal resistance 201 to be measured exists in the communication bus to be measured, the terminal resistance 201 to be measured is connected in parallel with the first resistance R1, the resistance value is changed, and then the voltage difference of the impedance adjustment circuit relative to the ground is changed, in the case that the terminal resistance 201 to be measured does not exist in the communication bus to be measured, only the first resistance R1 is connected in series between the output end of the power supply 103 and the ground end, the voltage difference of the first voltage value and the second voltage value collected at the two ends of the impedance adjustment circuit is different from the voltage difference of the impedance adjustment circuit collected when the terminal resistance 201 to be measured is connected in parallel with the first resistance R1, so that whether the terminal resistance 201 to be measured exists in the communication bus to be measured is determined.

[0085] In the embodiment of the utility model, the resistance value of the resistance R2 can be 120Ω exemplarily, in the case that the control circuit 102 determines that the terminal resistance 201 to be measured exists in the communication bus to be measured according to the first voltage value and the second voltage value collected at the two ends of the impedance adjustment circuit, the control circuit 102 can control the first switch K1 to be conducted, and the second switch K2 continues to be conducted, the control circuit 102 collects the voltage value at the two ends of the impedance adjustment circuit to determine the voltage difference, if the voltage difference is U2=(RL / / R1)*I=60V, it can be determined that the resistance R2 is connected in parallel at the end of the communication bus to be measured, and the impedance matching of the communication bus to be measured is realized, otherwise, it can be determined that the resistance R2 is not successfully connected.

[0086] It should be noted that further, after the control circuit 102 determines that the resistance R2 is connected in parallel at the end of the communication bus to be measured, the second switch K2 can be controlled to be turned off, and the first switch K1 continues to be conducted, so that the resistance R2 realizes the function of the terminal resistance.

[0087] It should be further explained that the first switch K1 and the second switch K2 can be a triode, a transistor, an IGBT, a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), or even a switching component, a high-low side chip, a signal relay, or other devices with switching functions. In addition, according to the channel type, it can be an N-type switch tube or a P-type switch tube; here, no specific limitation is made.

[0088] It should be further explained that the lines connected across the configuration resistance R2 can be two signal lines CAN_H and CAN_L, which are extended from the communication bus to be detected.

[0089] The embodiment of the utility model provides a kind of battery management system, first configuration unit includes configuration resistance and first switch, switch unit includes second switch, wherein, configuration resistance is used as matching terminal resistance to provide to communication bus to be detected when terminal resistance is not set in communication bus to be detected, avoid not set in communication bus to be detected to influence normal communication that terminal resistance is detected, improve communication reliability;First switch is used to turn on when detecting that terminal resistance is not set in communication bus to be detected, ensure that the terminal impedance of communication bus to be detected remains consistent;Second switch is used to turn on when detecting the first voltage value and the second voltage value across impedance adjustment circuit, ensure that the collection of voltage value is with ground as reference, improve the accuracy of collection voltage value.

[0090] In some embodiments, with reference to Figure 3 Second switch K2 is configured to be in an on state in response to a second control signal sent by control circuit 102 to enable control circuit 102 to collect a voltage value across first resistance branch 1011.

[0091] In the embodiment of the utility model, control circuit 102 can control the on or off of second switch K2 based on the level state of the second control signal sent to second switch K2, and the correspondence between the level state and the state of second switch K2 can be determined according to the device properties of second switch K2. For example, second switch K2 can be controlled to be on when the second control signal is in a high level state, or second switch K2 can be controlled to be off when the second control signal is in a high level state.

[0092] As described above, after communication bus to be detected 20 is connected, control circuit 102 controls first switch K1 to be off and second switch K2 to be on, collects the first voltage value and the second voltage value across first resistance branch, and determines whether the circuit between them is connected to terminal resistance to be detected 201.

[0093] The embodiment of the utility model provides a kind of battery management system, second switch is in the on state based on the second control signal sent by control circuit, so that control circuit gathers the voltage value at the two ends of first resistance branch, determine whether there is terminal resistance to be measured in the communication bus to be measured, improve communication reliability.

[0094] In some embodiments, with reference to Figure 3 Second switch K2 is also configured to be in the off state in response to a third control signal sent by control circuit 102 in the case where it is determined that there is terminal resistance to be measured 201 in the communication bus to be measured 20.

[0095] Further, in the case where it is determined that there is terminal resistance to be measured 201 in the communication bus to be measured 20, first switch K1 is kept off, and second switch K2 is controlled to be off by a third control signal, so that terminal resistance to be measured 201 in the communication bus to be measured 20 works normally.

[0096] The embodiment of the utility model provides a kind of battery management system, control circuit sends control signal to first switch and second switch, and the on or off of first switch and second switch is controlled.Such, the state of first switch and second switch is controlled to realize different circuit connections, and second switch is controlled to be off in the case where it is determined that there is terminal resistance to be measured in the communication bus to be measured, guarantee the impedance matching consistency of communication bus terminal to be measured, improve communication reliability.

[0097] In some embodiments, with reference to Figure 3 First switch K1 is configured to be in the on state in response to a fourth control signal sent by control circuit 102 in the case where it is determined that there is no terminal resistance to be measured 201 in the communication bus to be measured 20.

[0098] Second switch K2 is configured to be in the off state in response to a fifth control signal sent by control circuit 102 in the case where it is determined that there is no terminal resistance to be measured 201 in the communication bus to be measured 20.

[0099] In the embodiment of the utility model, control circuit 102 can control the on or off of first switch K1 based on the level state of the fourth control signal sent to first switch K1, and control the on or off of second switch K2 based on the level state of the fifth control signal sent to second switch K2, and the correspondence between the level state and the state of second switch K2 can be determined according to the device properties of second switch K2.Exemplarily, second switch K2 can be controlled to be on in the case where the fifth control signal is in a high level state, or second switch K2 can be controlled to be off in the case where the fifth control signal is in a low level state.

[0100] As described above, the control circuit 102 collects the voltage value across the first resistance branch when the first switch K1 is off and the second switch K2 is on. Further, when it is determined that there is no terminal resistance 201 to be tested in the communication bus 20 to be tested, the control circuit 102 controls the first switch K1 to be on based on the fourth control signal, and controls the second switch K2 to be off based on the fifth control signal, so that the configuration resistance R2 replaces the terminal resistance to be tested in the communication bus 20 to be tested to work normally.

[0101] The utility model embodiment provides a kind of battery management system, control circuit sends control signal to first switch and second switch, the conduction or off of first switch and second switch is controlled. In this way, the state of first switch and second switch is controlled to realize different circuit connections, in the case where it is determined that there is no terminal resistance to be tested in the communication bus to be tested, configuration resistance is accessed, ensure that the impedance matching consistency of communication bus terminal to be tested, improve communication reliability.

[0102] In another embodiment of the utility model, Figure 4 A schematic diagram of the composition structure of the battery management system provided in the embodiment of the utility model Figure Four As shown in Figure 4 The battery management system 10 further includes a power supply 103, which can include a power supply chip 1031, a third resistor R3 and a fourth resistor R4. Wherein:

[0103] The first end of the power supply chip 1031 is connected to the first end of the third resistor R3, and the second end of the third resistor R3 is connected to the second end of the power supply chip 1031 and the first end of the fourth resistor R4, respectively.

[0104] The second end of the fourth resistor R4 is connected to the first end of the impedance adjustment circuit and the first end of the control circuit 102, respectively.

[0105] In the embodiment of the utility model, the power supply chip 1031 can be a constant current source chip, which continuously outputs a stable current value. For example, the output current value can be 1mA.

[0106] In the embodiment of the utility model, the third resistor R3 and the fourth resistor R4 are connected to the output end of the power supply chip 1031, which can be used for voltage division and current limiting. The lead wire between the third resistor R3 and the fourth resistor R4 is connected to the power supply chip 1031 as a feedback terminal of the output current of the power supply chip 1031, so that the power supply chip 1031 adjusts the output current value based on the feedback.

[0107] It should be noted that the resistance value of the third resistor R3 and the resistance value of the fourth resistor R4 can be configured according to the installation manual of the power supply chip 1031.

[0108] The utility model embodiment provides a kind of battery management system, power supply can include power supply chip, third resistance and fourth resistance, can guarantee the current of output sustained stability.

[0109] In some embodiments, continuing to refer to Figure 4 The resistance value of the first resistance R1, the resistance value of the configuration resistance R2 and the resistance value of the terminal resistance 201 to be measured are equal.

[0110] In the utility model embodiment, as aforementioned, the resistance value of the first resistance R1, the resistance value of the configuration resistance R2 and the resistance value of the terminal resistance 201 to be measured can be equal, and exemplarily, can all be 120Ω.

[0111] It should be understood that the resistance values of the above-mentioned resistances can also be set to other values, but according to the standard of CAN communication bus, the resistance value of the terminal resistance 201 to be measured is preferably determined as 120Ω. The configuration resistance R2 is used to replace the terminal resistance 201 to be measured to access the communication bus to be measured, and thus should be equal to the resistance value of the terminal resistance 201 to be measured, which is 120Ω. In addition, in order to facilitate calculation and reduce the resistance value type of resistance, avoiding inventory, the resistance value of the first resistance R1 can also be set to 120Ω.

[0112] The utility model embodiment provides a kind of battery management system, the resistance value of first resistance, the resistance value of configuration resistance and the resistance value of terminal resistance to be measured are equal, in this way, can reduce the device type of resistance, avoid inventory, also facilitate the calculation of control circuit, improve detection efficiency and the accuracy of matching.

[0113] In another embodiment of the utility model, Figure 5 A schematic diagram of the composition structure of a battery pack is provided for the utility model embodiment. As shown in Figure 5 The battery pack 30 includes the battery management system 10 in the foregoing embodiment.

[0114] In the utility model embodiment, Figure 6 A schematic diagram of the execution process of a battery management system is provided for the utility model embodiment. As shown in Figure 6 The execution process of the battery management system 10 can include:

[0115] S401, the power supply outputs current.

[0116] S402, the control circuit judges the voltage value across the impedance adjustment circuit.

[0117] S403, the control circuit judges whether the terminal resistance to be measured exists.

[0118] S404, the control circuit controls the first switch and the second switch to be turned on or turned off.

[0119] In the embodiment of the utility model, Figure 7 The application scenario schematic diagram of the battery management system is provided in the embodiment of the utility model. Figure 7 As shown, the battery management system 10 is connected with the CAN transceiver circuit 202 through the aforementioned to-be-measured communication bus 20. The to-be-measured terminal resistor 201 is arranged in the CAN transceiver circuit 202. Exemplarily, the resistance value of the first resistor, the resistance value of the configuration resistor and the resistance value of the to-be-measured terminal resistor are all 120Ω. The current value I=1mA is output by the power supply, the voltage across the impedance adjustment circuit is collected by the control circuit (with the ground as the reference), if the difference U1 between the first voltage value and the second voltage value collected across the impedance adjustment circuit is (RL / / R1)*I=60V, it is indicated that the terminal of the to-be-measured communication bus is provided with the to-be-measured terminal resistor and has the matching impedance; if the difference between the first voltage value and the second voltage value collected across the impedance adjustment circuit is not 60V, for example, 120V, it is indicated that the terminal of the to-be-measured communication bus is not provided with the to-be-measured terminal resistor and does not have the matching impedance.

[0120] When the terminal (for example, the CAN transceiver circuit 202) connected with the to-be-measured communication bus is provided with the to-be-measured terminal resistor, the first switch K1 is kept to be continuously disconnected. When the terminal (for example, the CAN transceiver circuit 202) connected with the to-be-measured communication bus is not provided with the to-be-measured terminal resistor, the control circuit sends the control signal to the first switch K1 to control the first switch K1 to be closed. The difference between the first voltage value and the second voltage value across the impedance adjustment circuit at this time is U2=(RL / / R1)*I=60V, which is equal to U1. At this time, the configuration resistor serves as the terminal matching impedance of the to-be-measured communication bus, and the consistency of the system impedance matching is ensured.

[0121] It should be noted that the first switch and the second switch include but are not limited to MOSFET. The first switch is controlled to be closed to ensure that the terminal impedance of the to-be-measured communication bus is always consistent. The second switch is controlled to be closed to ensure that the voltage across the impedance adjustment circuit is collected by the control circuit with the ground as the reference at the same time, and the second switch is turned off at other times.

[0122] In the embodiment of the utility model, the stable current is output by the power supply, the voltage values across the impedance adjustment circuit are compared by the control circuit, and it is judged whether the to-be-measured terminal resistor exists at the terminal of the to-be-measured communication bus. In addition, the impedance matching of the to-be-measured communication bus is realized by controlling the conduction or turn-off of the first switch and the second switch.

[0123] The utility model embodiment provides a kind of battery pack, utilize the cooperation of power supply and switching device, the self-checking of the terminal impedance of the communication bus to be measured is realized by the mode of voltage detection, and then it is judged whether the terminal matching impedance of the communication bus to be measured exists;In addition, it can also automatically carry out impedance matching when the communication bus to be measured does not have matching terminal resistance, guarantee the impedance matching demand of the communication bus to be measured, so as to realize the terminal impedance matching function on the communication bus to be measured.

[0124] In another embodiment of the utility model, Figure 8 A schematic diagram of the composition structure of the electric drive device is provided in the embodiment of the utility model. As shown in Figure 8 The battery pack 30 in the foregoing embodiment.

[0125] In the embodiment of the utility model, the electric drive device 50 can be a device driven by a battery as power, which contains a battery pack inside, and whether the terminal resistance exists in the plurality of CAN communication buses connected inside can be detected respectively. Exemplarily, the electric drive device 50 can be a new energy vehicle, a ship, an airplane, etc., for example, it can also be a power device such as an electric vehicle, a hybrid vehicle, an electric motorcycle, etc.

[0126] It should be understood that those skilled in the art should understand that the utility model can adopt a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Moreover, the utility model can adopt the form of a computer program product implemented on one or more computer usable storage media (including but not limited to magnetic disk storage and optical storage, etc.) containing computer usable program code.

[0127] It should also be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the utility model. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the utility model, the size of the serial number of each step / process does not mean the execution order, and the execution order of each step / process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiment of the utility model. The serial number of the above embodiment of the utility model is only for description, not representing the pros and cons of the embodiment.

[0128] It should be noted that in the present application, the terms "comprising", "including", or any other variant thereof are intended to cover a non-exclusive inclusion, so that a process, method, article, or device that comprises a list of elements does not only include those elements but can also include other elements not expressly listed or inherent to such process, method, article, or device. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0129] In several embodiments provided by the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. The above described device embodiments are only illustrative, for example, the division of units is only a logical function division, and actual implementation can have another division manner, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each component part shown or discussed can be through some interface, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0130] The units described above as separate components can or can not be physically separated, and the components shown as units can or can not be physical units; they can be located in one place or distributed on multiple network units; some or all of the units can be selected according to actual needs to achieve the purpose of the present embodiment. In addition, in each embodiment of the present application, each functional unit can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the above integrated unit can be realized in the form of hardware or in the form of hardware plus software functional unit.

[0131] The above is only a preferred embodiment of the present application, and is not intended to limit the protection scope of the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery management system, characterized by, The battery management system comprises an impedance adjusting circuit and a control circuit, the impedance adjusting circuit comprises a first resistance branch, the first resistance branch is connected in parallel on a communication bus to be detected, and the impedance adjusting circuit is connected with the control circuit; wherein: A first end of the impedance adjusting circuit is connected with a power supply, and a second end of the impedance adjusting circuit is connected with a ground end; The control circuit is configured to, based on a voltage value between the two ends of the impedance adjusting circuit, in a case where it is determined that there is no terminal resistance to be detected in the communication bus to be detected, send a first control signal to the impedance adjusting circuit; The impedance adjusting circuit is configured to, in response to the first control signal, provide a configuration resistance for the communication bus to be detected through the first resistance branch.

2. The battery management system of claim 1, wherein, The impedance adjusting circuit further comprises a second resistance branch; wherein: The first resistance branch comprises a first configuration unit and a switch unit, and the second resistance branch is connected in parallel with the first configuration unit; A first end of the first configuration unit is connected with the power supply and a first end of the control circuit respectively, a second end of the first configuration unit is connected with a first end of the switch unit, and a second end of the switch unit is connected with the ground end and a second end of the control circuit respectively.

3. The battery management system of claim 2, wherein, The second resistance branch comprises a first resistance; wherein: A first end of the first resistance is connected with the first end of the first configuration unit, the power supply and the first end of the control circuit respectively; A second end of the first resistance is connected with the second end of the first configuration unit and the first end of the switch unit respectively.

4. The battery management system of claim 3, wherein, The first configuration unit comprises the configuration resistance and a first switch, and the switch unit comprises a second switch; wherein: A first end of the configuration resistance is connected with the first end of the first resistance, the power supply and the first end of the control circuit respectively, and a second end of the configuration resistance is connected with a first end of the first switch; A second end of the first switch is connected with the second end of the first resistance and a first end of the second switch respectively; A second end of the second switch is connected with the second end of the control circuit and the ground end respectively.

5. The battery management system according to claim 4, wherein The second switch is configured to, in response to a second control signal sent by the control circuit being in a conductive state, enable the control circuit to collect the voltage value between the two ends of the first resistance branch.

6. The battery management system according to claim 5, wherein The second switch is further configured to, in a case where it is determined that there is the terminal resistance to be detected in the communication bus to be detected, respond to a third control signal sent by the control circuit being in a disconnected state.

7. The battery management system according to claim 5, wherein The first switch is configured to, in a case where it is determined that there is no terminal resistance to be detected in the communication bus to be detected, respond to a fourth control signal sent by the control circuit being in a conductive state; The second switch is configured to, in a case where it is determined that there is no terminal resistance to be detected in the communication bus to be detected, respond to a fifth control signal sent by the control circuit being in a disconnected state.

8. The battery management system of claim 1, wherein, The battery management system further comprises the power supply source, the power supply source comprising a power supply chip, a third resistor and a fourth resistor; wherein: a first end of the power supply chip is connected with a first end of the third resistor, a second end of the third resistor is connected with a second end of the power supply chip and a first end of the fourth resistor respectively; a second end of the fourth resistor is connected with a first end of the impedance adjustment circuit and a first end of the control circuit respectively.

9. The battery management system of any one of claims 1-8, wherein, The resistance value of the first resistor, the resistance value of the configuration resistor and the resistance value of the terminal resistor to be measured are equal.

10. A battery pack, characterized by, The battery pack comprises the battery management system according to any one of claims 1 to 9.

11. An electric drive device, characterized by The electric driving device comprises the battery pack according to claim 10.

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